[go: up one dir, main page]

CN114006467B - A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable - Google Patents

A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable Download PDF

Info

Publication number
CN114006467B
CN114006467B CN202111437914.0A CN202111437914A CN114006467B CN 114006467 B CN114006467 B CN 114006467B CN 202111437914 A CN202111437914 A CN 202111437914A CN 114006467 B CN114006467 B CN 114006467B
Authority
CN
China
Prior art keywords
power
bus
load
buses
energized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111437914.0A
Other languages
Chinese (zh)
Other versions
CN114006467A (en
Inventor
何晓峰
陈择栖
郑晓辉
陈洪云
张安龙
马伟哲
程韧俐
程维杰
刘金生
翁毅选
卢艺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Power Supply Bureau Co Ltd
Original Assignee
Shenzhen Power Supply Bureau Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Power Supply Bureau Co Ltd filed Critical Shenzhen Power Supply Bureau Co Ltd
Priority to CN202111437914.0A priority Critical patent/CN114006467B/en
Publication of CN114006467A publication Critical patent/CN114006467A/en
Application granted granted Critical
Publication of CN114006467B publication Critical patent/CN114006467B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a single-section bus power-off automatic switching control method for accessing a superconducting cable to a power grid with a multi-section structure of the superconducting cable, which comprises the steps of obtaining a power-off bus and a non-power-off bus at the adjacent side of the power-off bus, and if the obtained non-power-off bus is only a single non-power-off bus at the adjacent side of the power-off bus and the incoming line of the single non-power-off bus is not the accessed superconducting cable, calculating the load margin of the single non-power-off bus according to the preset incoming line capacity and load power corresponding to the single non-power-off bus, and selecting the single non-power-off bus to directly switch on after judging that the load margin of the single non-power-off bus is larger than or equal to the preset load power before the power-off bus is powered off so as to realize power restoration of the power-off bus. By implementing the invention, the spare power source can be reasonably selected, the overload condition of the overload and the cut-off load can be avoided, and the power supply reliability and the continuity are improved.

Description

Single-section bus power-off automatic switching control method and system for superconducting cable access
Technical Field
The invention relates to the technical field of automatic switching of a standby power supply of an electric power system, in particular to a single-section bus power-loss standby automatic switching control method and system for superconducting cable access.
Background
Different from a typical single bus two-section structure, after the superconducting cable is connected with a multi-section structure, bus power failure fault conditions are various, so that the spare power switching control is more complex.
Under the condition of power failure of a single-section bus, the problem that a standby power supply supplies power for a plurality of sections of buses in standby mode is solved. Therefore, the spare power switching control needs to prevent the power-losing bus from simultaneously switching to the live buses on two sides to form an electromagnetic ring network, and the key point is to reasonably select the spare power switching power supply according to the load capacity of the power-losing bus section and the capacity margin of the spare power supply, and meanwhile, the overload combined switching load needs to be avoided so as to improve the power recovery rate.
However, the existing spare power automatic switching control method is suitable for a power grid scene of bus multi-section complex wiring, but lacks a power grid scene of multi-section annular wiring accessed by a superconducting cable. Therefore, there is a need for a single-section bus power-loss automatic switching control method for superconducting cable access, which can reasonably select the spare power source, avoid overload and cut-off load conditions, and improve the power supply reliability and continuity.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the single-section bus power-loss automatic switching control method and system for the superconducting cable access, which can reasonably select the spare power source, avoid the overload and combined switching load condition and improve the power supply reliability and continuity.
In order to solve the technical problems, the embodiment of the invention provides a single-section bus power-loss automatic switching control method for accessing a superconducting cable, which is used for accessing a substation bus to a power grid with a multi-section structure of the superconducting cable, and comprises the following steps:
Acquiring power-losing bus and adjacent bus a side non-powered down bus;
If the obtained non-power-loss bus is only a single non-power-loss bus on the adjacent side of the power-loss bus, and the incoming line of the single non-power-loss bus is not a connected superconducting cable, calculating the load margin of the single non-power-loss bus according to the incoming line capacity and the load power preset for the single non-power-loss bus, and after the load margin of the single non-power-loss bus is judged to be greater than or equal to the preset load power before the power-loss bus is powered off, selecting the single non-power-loss bus to be directly switched on to realize the recovery of the power supply of the power-loss bus.
Wherein the method further comprises:
If the obtained non-power-down buses are two non-power-down buses on two adjacent sides of the power-down buses, and the incoming line of one non-power-down bus is not an accessed superconducting cable, when the incoming line of the other non-power-down bus is an accessed superconducting cable, according to the preset incoming line capacity and load power of the non-power-down bus corresponding to the non-power-down bus which is not accessed into the superconducting cable, calculating the load margin of the non-power-down bus which is not accessed into the superconducting cable, and after the load margin of the non-power-down bus which is not accessed into the superconducting cable is not less than or equal to the preset load power before the power-down bus is powered down, selecting the non-power-down bus which is not accessed into the superconducting cable to directly carry out spare power switching so as to realize power restoration of the power-down bus.
Wherein the method further comprises:
If the obtained non-power-loss buses are two non-power-loss buses on two adjacent sides of the power-loss buses, and the incoming wires of the two non-power-loss buses are not the accessed superconducting cables, calculating the load margin of the two non-power-loss buses according to the incoming wire capacity and the load power preset by the corresponding two non-power-loss buses, and after judging that the load margin of at least one of the two non-power-loss buses is greater than or equal to the preset load power before the power-loss of the power-loss bus, selecting the direct spare power with the largest load margin among the two non-power-loss buses to realize the recovery power supply of the power-loss buses.
Wherein the method further comprises:
If the load margin of the two non-power-loss buses is smaller than the preset load power before the power-loss buses lose electricity, and at least one of the two non-power-loss buses shares the same incoming line with the corresponding non-power-loss bus outside the two non-power-loss buses, one of the shared incoming lines is taken, the non-power-loss bus loads which are not adjacent to the power-loss buses in the taken incoming lines are transferred, so that the load margin of the non-power-loss bus corresponding to the shared incoming line in the two non-power-loss buses is larger than or equal to the preset load power before the power-loss buses lose electricity, and then the non-power-loss bus spare power which corresponds to the shared incoming line in the two non-power-loss buses is selected to realize the power recovery of the power-loss buses, or
And taking all the shared incoming lines, and transferring the loads of non-power-down buses which are not adjacent to the power-down buses in all the taken incoming lines, so that after the load margin of the two non-power-down buses is larger than or equal to the preset load power before the power-down buses are powered down, any one of the two non-power-down buses can be selected for standby power switching so as to realize the recovery of the power supply of the power-down buses.
Wherein the method further comprises:
if all the shared incoming lines are taken, and the loads of non-power-down buses which are not adjacent to the power-down buses in all the taken incoming lines are transferred, and the load margin of the two non-power-down buses is still smaller than the preset load power before power-down of the power-down buses, according to the preset load power before power-down of the power-down buses and the incoming line capacity and the load power of the non-power-down bus with the largest load power among the two non-power-down buses, calculating the overload rate, comparing the overload rate with the preset overload rate, and further selecting a corresponding load switching mode according to the comparison result to cut off the overload loads of the two non-power-down buses when the power-down buses are simultaneously switched, wherein the load switching mode is a mode of switching loads after standby or a mode of switching loads in a combined mode of switching loads after standby.
Wherein the method further comprises:
By the formula Calculating overload rate eta, wherein L i is the preset load power before the power-off of the power-off buses, delta S is the load margin of the power-off bus with the largest load power among the two power-off buses, delta S=S N-LN;SN is the incoming line capacity of the power-off bus with the largest load power among the two power-off buses, and L N is the preset load power of the power-off bus with the largest load power among the two power-off buses;
if the overload rate eta (i) is less than or equal to the preset overload rate eta set, selecting a spare power switching back-up load switching mode to cut off overload loads when the two non-power-loss buses are simultaneously switched on the power-loss buses;
And if the overload rate eta (i) is greater than the preset overload rate eta set, selecting a mode of combining the pre-cut load and the post-backup power switching combined cut load to cut off the overload loads of the two non-power-loss buses and the backup power-switching power-loss bus, wherein the pre-cut load quantity is delta L= (L i-ΔS)-ηsetSN).
The embodiment of the invention also provides a single-section bus power-loss automatic switching control system for the superconducting cable access, which is used for the substation bus to be accessed to a power grid with a multi-section structure of the superconducting cable, and comprises the following steps:
a bus bar acquisition unit, which is used for acquiring the bus bar, for obtaining power-loss bus bars a non-powered-down busbar on an adjacent side;
and the first spare power switching control unit is used for calculating the load margin of the single non-power-loss bus according to the preset incoming line capacity and load power corresponding to the single non-power-loss bus when the obtained non-power-loss bus is only a single non-power-loss bus on the adjacent side of the power-loss bus and the incoming line of the single non-power-loss bus is not an accessed superconducting cable, and selecting the single non-power-loss bus to be directly switched on after the load margin of the single non-power-loss bus is larger than or equal to the preset load power before the power-loss of the power-loss bus so as to realize the recovery power supply of the power-loss bus.
Wherein, still include:
and the second standby power switching control unit is used for calculating the load margin of the non-power-loss buses which are not connected with the superconducting cable according to the preset incoming capacity and the load power of the non-power-loss buses which are not connected with the superconducting cable when the obtained non-power-loss buses are two non-power-loss buses which are adjacent to each other and the incoming line of one non-power-loss bus is not a connected superconducting cable and the incoming line of the other non-power-loss bus is a connected superconducting cable, and selecting the non-power-loss buses which are not connected with the superconducting cable to directly switch back to the standby power after the load margin of the non-power-loss buses which are not connected with the superconducting cable is judged to be larger than or equal to the preset load power before the power-loss buses are powered off so as to realize the recovery power supply of the non-power-loss buses.
Wherein, still include:
And the third spare power switching control unit is used for calculating the load margin of the two non-power-loss buses according to the preset incoming line capacity and the load power of the corresponding two non-power-loss buses when the obtained non-power-loss buses are two non-power-loss buses on two adjacent sides of the power-loss bus and the incoming lines of the two non-power-loss buses are not the accessed superconducting cables, and selecting the direct spare power with the largest load margin among the two non-power-loss buses after judging that the load margin of at least one of the two non-power-loss buses is larger than or equal to the preset load power before the power-loss of the power-loss bus so as to realize the recovery power supply of the power-loss bus.
Wherein, still include:
A fourth backup power switching control unit, configured to, if it is determined that load margins of the two non-power-loss buses are smaller than load power preset before power-loss of the power-loss buses, and when at least one of the two non-power-loss buses shares the same wire with a corresponding non-power-loss bus other than the two non-power-loss buses, take one of the shared wires, switch loads of non-power-loss buses, which are not adjacent to the power-loss buses, in the taken wire, so that the load margin of the non-power-loss bus, which corresponds to the shared wire, in the two non-power-loss buses is greater than or equal to the load power preset before power-loss of the power-loss bus, and select the backup power switching of the non-power-loss bus, which corresponds to the shared wire, in the two non-power-loss buses, to realize power restoration of the power-loss bus, or
And taking all the shared incoming lines, and transferring the loads of non-power-down buses which are not adjacent to the power-down buses in all the taken incoming lines, so that after the load margin of the two non-power-down buses is larger than or equal to the preset load power before the power-down buses are powered down, any one of the two non-power-down buses can be selected for standby power switching so as to realize the recovery of the power supply of the power-down buses.
The embodiment of the invention has the following beneficial effects:
The invention is suitable for a power grid with a multi-segment structure, in which a substation bus is connected to a superconducting cable, comprehensively utilizes the condition that whether an incoming line of a non-power-loss bus is connected to the superconducting cable or not and whether the load margin of the non-power-loss bus is larger than or equal to the load power before power loss of the power-loss bus, is used for reasonably selecting a spare power supply between segments, can also avoid the occurrence of overload combined cut load condition, and improves the power supply reliability and continuity.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
Fig. 1 is a flowchart of a single-section bus power-loss backup power automatic switching control method for superconducting cable access provided by an embodiment of the invention;
Fig. 2 is a schematic structural diagram of a power grid with a multi-segment structure, in which a substation bus is connected to a superconducting cable, in a single-segment bus power-loss automatic switching control method for superconducting cable connection provided by an embodiment of the invention;
FIG. 3 is an application scenario diagram of the partial structure of FIG. 2;
fig. 4 is a logic diagram of the backup power automatic switching control of the single bus power failure in fig. 3;
Fig. 5 is a schematic diagram of a single-section bus power-loss automatic switching control structure for superconducting cable access according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, in an embodiment of the present invention, a single-section bus power-loss automatic switching control method for accessing a superconducting cable is provided, which is used for accessing a substation bus to a power grid with a multi-section structure of the superconducting cable (see fig. 2), and the method includes the following steps:
step S1, obtaining a power-losing bus and a non-power-losing bus on the adjacent side of the power-losing bus;
The method comprises the steps of firstly, sampling and calculating the voltage of each bus section, the incoming current of each incoming line and the load of each bus in real time through a voltage transformer and an incoming current transformer on each bus, storing calculated values, collecting the on-off states of QF 01-QF 0n and QF 12-QFn (n+1) switches, and recording the on-off states of incoming line switches arranged on each bus and the on-off states of bus connection sectional switches connected between each bus and adjacent buses. According to the requirements, the buses are numbered from left to right as 1M, 2M, iM, (i+1) M, nM, iM inlet switch is numbered QF0i, and bus bar sectional switch between iM and (i+1) M is numbered QFi (i+1).
It should be noted that before step S1, the method further includes the step of acquiring the load of each bus as the preset load power of each bus and acquiring the preset incoming capacity of the incoming line connected to each bus when the incoming line switch connected to each bus is closed and the bus segment switch connected to each bus is opened.
In one embodiment, the iM bus voltage U (I) is stored in the array { U (k) }, the iM line current I (I) is stored in the array { I (k) }, the iM load power is recordedStored in an array { L (k) }, and recording the incoming line capacity of each branch (namely the preset power supply capacity of the transformer substation) as a preset value to be stored in an array { S (i) }.
Detecting the on-off state of all the incoming line switches, recording the on-off state in an array { QF0 (k) }, if an iM incoming line switch QF0i is disconnected, QF0 (i) =0, otherwise QF0 (i) =1, detecting the on-off state of all the bus segmented switches, recording the on-off state in an array { QF (k) }, and if an iM and an (i+1) M bus segmented switch QFi (i+1) are disconnected, QF (i) =0, otherwise QF (i) =1.
Meanwhile, the following array storage standby automatic switching selected process signals are set, wherein a bus power failure flag word array { M (k) }, an element M (k) =1 represents that an iM bus is powered down, a load margin array { delta S (k) }, and an element delta S (i) records the load margin of the iM bus.
Secondly, traversing the voltages of all buses and the corresponding incoming line currents, identifying the buses with the voltages smaller than a preset voltage threshold and the incoming line currents smaller than a preset current threshold as power-losing buses, and identifying the other remaining buses except the power-losing buses as non-power-losing buses. Therefore, one non-power-loss bus (i-1) M or (i+1) M of the single-section bus iM with power loss and adjacent sides thereof can be obtained by traversing, or two non-power-loss buses (i-1) M and (i+1) M can be obtained.
For example, comparing U (I) with voltage threshold U set, I (I) with current threshold I set, if U (I) < U set and I (I) < I set, determining that the iM bus is a power-off bus, juxtaposing bus power-off flag word M (I) =1, otherwise, determining that the iM bus is a non-power-off bus, if all M (I) =0, no power-off bus is present, and ending the detection. Wherein U set and I set are preset setting values, and typical values can be taken as 0.1U N and 0.04I N, respectively.
And S2, if the obtained non-power-loss bus is only a single non-power-loss bus on the adjacent side of the power-loss bus, and the incoming line of the single non-power-loss bus is not a connected superconducting cable, calculating the load margin of the single non-power-loss bus according to the preset incoming line capacity and load power corresponding to the single non-power-loss bus, and after the load margin of the single non-power-loss bus is larger than or equal to the preset load power before the power-loss bus is powered off, selecting the single non-power-loss bus to be directly switched on so as to realize the recovery power supply of the power-loss bus.
The method comprises the specific process that when only one non-power-loss bus (i+1) M exists on the adjacent side of a single-section bus iM of power loss and the incoming line of the single non-power-loss bus (i+1) M is not an accessed superconducting cable, the load margin delta S (i+1) =S (i+1) -L (i+1) of the single non-power-loss bus (i+1) M is calculated, wherein S (i+1) is the preset incoming line capacity of the single non-power-loss bus (i+1) M, and L (i+1) is the preset load power of the single non-power-loss bus (i+1) M.
When delta S (i+1) is not less than L (i), the single non-power-loss bus (i+1) M is directly switched on to realize power restoration of the power-loss bus iM, wherein L (i) is preset load power of the power-loss bus iM. It can be understood that if the incoming line of the non-power-loss bus (i+1) M is a superconducting cable or the load margin Δs (i+1) < L (i), no backup power can be switched, and the power restoration of the power-loss bus iM cannot be realized.
In the embodiment of the invention, if the spare power switching power supplies are arranged on two sides of the power-losing bus iM, namely, two non-power-losing buses (i-1) M and (i+1) M exist, whether the two non-power-losing buses are connected with the superconducting cable or not is judged, and if one non-power-losing bus is connected with the superconducting cable, when the load margin of the non-power-losing bus is larger than or equal to the preset load power L (i) of the power-losing bus iM, the non-power-losing bus which is not connected with the superconducting cable is selected as the spare power supply for spare power switching. It should be noted that if both the two non-power-loss buses (i-1) M and (i+1) M have superconducting cables, the backup power cannot be switched, and the power restoration of the power-loss bus iM cannot be realized.
Therefore, if the obtained non-power-down buses are two non-power-down buses on two adjacent sides of the power-down buses, and the incoming line of one non-power-down bus is not an accessed superconducting cable, when the incoming line of the other non-power-down bus is an accessed superconducting cable, according to the preset incoming line capacity and load power of the non-power-down bus corresponding to the non-power-down bus not accessed superconducting cable, calculating the load margin of the non-power-down bus not accessed superconducting cable, and after the load margin of the non-power-down bus not accessed superconducting cable is judged to be greater than or equal to the preset load power before the power-down bus is powered down, selecting the non-power-down bus not accessed superconducting cable to directly carry out power backup so as to realize power restoration of the power-down bus.
The method comprises the specific steps that two non-power-loss buses (i-1) M and (i+1) M are arranged on adjacent sides of a single-section power-loss bus iM, the incoming line of the non-power-loss bus (i-1) M is not an accessed superconducting cable, when the incoming line of the non-power-loss bus (i+1) M is an accessed superconducting cable, the non-power-loss bus (i+1) M of the accessed superconducting cable is abandoned, and the load margin delta S (i-1) =S (i-1) -L (i-1) of the non-power-loss bus (i-1) M is calculated, wherein S (i-1) is the preset incoming line capacity of the non-power-loss bus (i-1) M, and L (i-1) is the preset load power of the non-power-loss bus (i-1) M.
When the delta S (i-1) is not less than L (i), the bus (i-1) M is directly switched on to realize the recovery of power supply of the power-losing bus iM.
In the embodiment of the invention, if the spare power switching power supplies are arranged on both sides of the power-losing bus iM, namely, two non-power-losing buses (i-1) M and (i+1) M exist, whether the two non-power-losing buses are connected with the superconducting cable or not is judged, and if the two non-power-losing buses are not connected with the superconducting cable, when the load margin of the two non-power-losing buses (i-1) M and (i+1) M is not less than or equal to the preset load power L (i) of the power-losing bus iM, the non-power-losing bus with the largest load margin can be selected as the spare power supply for spare power switching.
Therefore, if the obtained non-power-loss buses are two non-power-loss buses on two adjacent sides of the power-loss buses, and the incoming wires of the two non-power-loss buses are not the accessed superconducting cables, calculating the load margin of the two non-power-loss buses according to the incoming wire capacity and the load power preset by the corresponding two non-power-loss buses, and after the load margin of at least one of the two non-power-loss buses is larger than or equal to the preset load power before the power-loss of the power-loss bus, selecting the direct spare power with the largest load margin among the two non-power-loss buses to realize the recovery power supply of the power-loss buses.
The specific process is that when two non-power-loss buses (i-1) M and (i+1) M are arranged on adjacent sides of a power-loss single-section bus iM, and the incoming wires of the two non-power-loss buses (i-1) M and (i+1) M are not connected superconducting cables, load margins delta S (i-1) =S (i-1) -L (i-1) and delta S (i+1) =S (i+1) -L (i+1) of the non-power-loss buses (i-1) M and (i+1) M are calculated respectively.
When the delta S (i-1) is more than or equal to L (i), the delta S (i+1) is more than or equal to L (i) and the delta S (i+1) is more than the delta S (i-1), the non-power-loss bus (i+1) M is directly switched on to realize the recovery of the power supply of the power-loss bus iM, otherwise, when the delta S (i-1) is more than or equal to L (i), the delta S (i+1) is more than or equal to L (i) and the delta S (i+1) is less than the delta S (i-1), the non-power-loss bus (i-1) M is directly switched on to realize the recovery of the power supply of the power-loss bus iM.
In the embodiment of the invention, if the spare power switching power supplies are arranged on two sides of the power-losing bus iM, namely, two non-power-losing buses (i-1) M and (i+1) M exist, and the two non-power-losing buses (i-1) M and (i+1) M are not connected into the superconducting cable, but the load margin of the two non-power-losing buses does not meet the requirement, whether the spare power supply has a load sharing function or not can be preferentially considered according to the connection structure of the two non-power-losing buses (i-1) M and (i+1) M, the load margin of the spare power supply is increased, and the load risk of the parallel switching is avoided as much as possible.
Therefore, if the load margin of the two non-power-loss buses is smaller than the preset load power before the power-loss buses are powered down, and at least one of the two non-power-loss buses shares the same incoming line with the corresponding non-power-loss bus out of the two non-power-loss buses, one of the shared incoming lines is taken, the non-power-loss buses which are not adjacent to the power-loss buses in the taken line are subjected to load transfer, so that the load margin of the non-power-loss bus corresponding to the shared incoming line in the two non-power-loss buses is larger than or equal to the preset load power before the power-loss bus is powered down, and then the non-power-loss bus spare power corresponding to the shared incoming line in the two non-power-loss buses is selected to realize power restoration of the power-loss buses, or
And taking all the shared incoming lines, and transferring the loads of non-power-down buses which are not adjacent to the power-down buses in all the taken incoming lines, so that after the load margin of the two non-power-down buses is larger than or equal to the preset load power before the power-down buses are powered down, any one of the two non-power-down buses can be selected for standby power switching so as to realize the recovery of the power supply of the power-down buses.
The specific process is that when the load margin of the two non-power-loss buses (i-1) M and (i+1) M is smaller than the preset load power L (i) before the power-loss bus iM is powered down, namely delta S (i-1) < L (i) and delta S (i+1) < L (i), whether at least one of the two non-power-loss buses (i-1) M and (i+1) M shares the same inlet wire with the corresponding non-power-loss bus except the two non-power-loss buses (i-1) M and (i+1) M is determined. For example, for a bus segment to which the low-voltage side branch type transformer is connected, the non-power-loss bus (i+1) M and the other non-power-loss bus (i+2) M share the same incoming line. For another example, for the bus section connected to the low-voltage side branch type transformer, the non-power-loss bus (i+1) M and the other non-power-loss bus (i+2) M share the same incoming line, and the non-power-loss bus (i-1) M and the other non-power-loss bus (i-2) M share the same incoming line.
(1) And if only one shared incoming line exists, transferring the load of the non-power-loss bus which is not adjacent to the power-loss bus in the taken incoming line (namely, the non-power-loss bus except for the two non-power-loss buses (i-1) M and (i+1) M) so that the load margin of the non-power-loss bus which corresponds to the shared incoming line in the two non-power-loss buses is larger than or equal to the preset load power before the power-loss bus is powered off, and selecting the spare power of the non-power-loss bus which corresponds to the shared incoming line in the two non-power-loss buses to realize the restoration of the power-loss bus. For example, the same incoming line is shared by the non-power-loss bus (i+1) M and the other non-power-loss bus (i+2) M, after the non-power-loss bus (i+2) M is turned over by the adjacent non-power-loss bus (i+3) M, the load margin of the non-power-loss bus (i+1) M is the sum of the load margin of the non-power-loss bus (i+2) M and the load margin of the non-power-loss bus (i+2) M, and after the obtained sum is greater than or equal to the preset load power L (i) before the power-loss bus iM is powered down, the spare power of the non-power-loss bus (i+1) M is selected to realize power restoration of the power-loss bus iM.
(2) If there are two common incoming lines:
(21) Taking one of the non-power-loss buses (non-power-loss buses except the two non-power-loss buses (i-1) M and (i+1) M, such as the non-power-loss bus (i+2) M) for transferring, and if the condition of the above (1) is met, enabling the non-power-loss buses (such as the non-power-loss bus (i+1) M) corresponding to the two non-power-loss buses sharing the taken line to be spare power to realize power restoration of the power-loss bus iM;
If the situation of the above (1) is not satisfied, the non-power-loss bus (except the two non-power-loss buses (i-1) M and (i+1) M), such as the non-power-loss bus (i-2) M), connected by the other wire is continuously taken for transferring, so that the non-power-loss bus (such as the non-power-loss bus (i-1) M) corresponding to the shared wire in the two non-power-loss buses is spare power, so as to realize the restoration of the power supply of the power-loss bus iM.
(22) And taking all the non-power-loss buses (except the two non-power-loss buses (i-1) M and (i+1) M), such as the non-power-loss buses (i-2) M and (i+2) M) which are connected by the common incoming line for transferring, and if the conditions of the (1) are met, randomly selecting one non-power-loss bus (such as the non-power-loss bus (i-1) M or the non-power-loss bus (i+1) M) from the two non-power-loss buses so as to realize restoration of power supply of the power-loss bus iM.
It should be noted that, the condition that the load of the non-power-loss bus connected by the common incoming line is transferred should satisfy the load margin of the non-power-loss bus whose load power is less than or equal to that of the non-power-loss bus supplied by the power supply. For example, if the non-power-loss bus bar (i+2) M is diverted, the load power L (i+2) <ofthe non-power-loss bus bar (i+2) m=the load margin Δs (i+3) of the non-power-loss bus bar (i+3) M, so that the load margin Δs (i+1) of the non-power-loss bus bar (i+1) M) +the load power L (i+2) > =the load power L (i) of the non-power-loss bus bar iM.
In the embodiment of the invention, if the spare power switching power supplies are arranged on two sides of the power-losing bus iM, namely, two non-power-losing buses (i-1) M and (i+1) M exist, and the two non-power-losing buses (i-1) M and (i+1) M are not connected into the superconducting cable, but the load margin of the two non-power-losing buses does not meet the requirement, and meanwhile, the two non-power-losing buses (i-1) M and (i+1) M do not have or cannot realize the load sharing function, and the operation safety of the spare power supplies is ensured by adopting the combined load switching.
For bus multi-section spare power switching, the electric quantity information and the switching value state information of each incoming and outgoing line can be utilized to dynamically adjust a cut-off line according to the importance degree of the load, the load with low importance degree is cut off preferentially, and the cut-off load capacity is reduced as much as possible. The dynamic overload combined cutting can be divided into two basic modes according to the time of load cutting, namely, cutting part of load before the spare power is switched, namely, pre-cutting the load, and cutting the corresponding load according to the overload condition after the spare power is switched, namely, cutting the load after the spare power is switched.
Among these, the main problem with pre-cut loads is that they can lead to excessive load shedding, reducing the complex power rate. For example, some motors have an automatic exit mechanism after losing power, and the pre-cut load cannot know load exit information in advance, so that excessive load removal is caused. The load is cut off after the spare power is switched, the load quantity of the cut off can be effectively reduced, but overload of the spare power equipment can be caused, and the operation safety of the spare power equipment is affected.
In order to reduce the cut load amount as much as possible on the premise of ensuring the operation safety of the standby power supply, an overload combined cutting improvement scheme is to adopt different combined cutting strategies according to the overload degree.
Therefore, when the load margin of the two non-power-loss buses is smaller than the preset load power before the power-loss buses lose electricity, and at least one of the two non-power-loss buses shares the same wire with the corresponding non-power-loss bus except the two non-power-loss buses, if all the shared wires are taken, and the non-power-loss buses which are not adjacent to the power-loss buses in all the taken wires are subjected to transfer supply, the load margin of the two non-power-loss buses is still smaller than the preset load power before the power-loss buses lose electricity, the overload rate is calculated according to the preset load power before the power-loss buses lose electricity and the wire inlet capacity and the load power of the non-power-loss bus with the maximum load power among the two non-power-loss buses, and the overload rate is compared with the preset overload rate, and the overload when the two non-power-loss buses are simultaneously switched by selecting a corresponding load switching mode according to the comparison result, wherein the load switching mode is a backup load switching pre-load or a backup load switching mode is selected according to the comparison result
When the load margin of the two non-power-loss buses is smaller than the preset load power before the power-loss buses lose power, and the two non-power-loss buses do not share the same incoming line, calculating the overload rate according to the preset load power before the power-loss buses lose power and the incoming line capacity and the load power of the non-power-loss bus with the largest load power among the two non-power-loss buses, comparing the overload rate with the preset overload rate, and further selecting a corresponding load switching mode according to the comparison result to cut off the overload load when the two non-power-loss buses are simultaneously switched on.
The specific process includes the first step of distinguishing whether the two non-power-loss buses have a common incoming line or not when the load margin of the two non-power-loss buses is smaller than the preset load power before the power-loss buses lose power. If yes, executing the second step, and if not, jumping to execute the third step;
the second step, continuously judging whether the load margin of the two non-power-loss buses after the transfer is smaller than the preset load power before the power-loss buses lose power or not;
Third step, through the formula Calculating overload rate eta, wherein L i is the preset load power before the power-off of the power-off buses, delta S is the load margin of the power-off bus with the largest load power among the two power-off buses, delta S=S N-LN;SN is the incoming line capacity of the power-off bus with the largest load power among the two power-off buses, and L N is the preset load power of the power-off bus with the largest load power among the two power-off buses;
Fourthly, if the overload rate eta (i) is less than or equal to the preset overload rate eta set, selecting a spare power switching back-on combined load switching mode to cut off the overload load when the two non-power-off buses are simultaneously switched on the power-off buses;
And fifthly, selecting a mode of combining the pre-cut load and the post-backup power switching combined cut load to cut off the overload load of the two non-power-lost buses and the backup power-switching power-lost bus if the overload rate eta (i) > the preset overload rate eta set, wherein the pre-cut load quantity is delta L= (L i-ΔS)-ηsetSN. If the backup power supply is still overloaded, performing secondary cut load according to the actual overload quantity.
As shown in fig. 3 and fig. 4, an application scenario of a single-section bus power-loss automatic switching control method for accessing a superconducting cable in an embodiment of the present invention is further described:
Taking fig. 3 as an example a multi-segment ring connection for a substation bus with superconducting cables. For ease of description, the bus bars and switches are renumbered. Of the three main transformers, the main transformer No. 2 is a low-voltage side branch type transformer. The 10kV bus is divided into five sections, a sectionalized breaker is not arranged between two sections of buses QF02 and QF03 for supplying power to the low-voltage side branch type transformer, and the rest buses are connected through the sectionalized breaker. For the specific control logic of fig. 3, please refer to fig. 4.
Assuming that the number of the power-losing bus is iM, two non-power-losing buses are respectively (i-1) M and (i+1) M on two adjacent sides. At this time, the backup power supply load margin is the backup power supply capacity minus the load that has been borne. That is, the load margins of the non-power-loss bus bars (i-1) M and (i+1) M are Δs (i-1) =s (i-1) -L (i-1), and Δs (i+1) =s (i+1) -L (i+1), respectively. Wherein S (i+1) and S (i-1) can be set in advance, and L (i+1) and L (i-1) are calculated in real time by the incoming line current and the bus section voltage.
If spare power sources are arranged on two sides of the power-losing bus iM, the calculated spare power source capacity margins delta S (i+1) and delta S (i-1) can be respectively compared with the load power L (i) before the power losing of the power-losing bus iM, if the capacity margin of only one side of the power-losing bus iM is greater than or equal to L (i), the section is a spare power source section, if the capacity margins of the power-losing buses on two sides are greater than or equal to L (i), whether incoming wires of the two sections of power-losing buses are connected with superconducting cables is judged, if yes, the power-losing buses of the non-superconducting cables are selected as spare power sources, and if no power-losing buses with larger capacity margins can be selected as spare power sources. For bus segments connected with the low-voltage side branch type transformer, as shown in fig. 3, only one side of the buses 2M and 3M is provided with a standby power supply, and when the buses 2M or 3M lose power, if the capacity margin of the buses 1M or 4M meets the requirement, the buses can be directly switched on.
If the capacity of the standby power supply does not meet the requirement through the calculation judgment, the load sharing of the bus section connected with the low-voltage side branch type transformer can be preferentially considered, the load margin of the standby power supply is increased, and the combined load is avoided as much as possible.
Taking the power-losing bus 1M in fig. 3 as an example, if the capacity margins of the standby power supplies 2M and 5M do not meet the requirements, a load sharing criterion may be started:
a, delta S (4) is not less than L (3), namely the capacity margin of the non-power-loss bus 4M is not less than the load power carried by the non-power-loss bus 3M;
And B, delta S (2) +L (3). Gtoreq.L (1), namely after the load of the non-power-loss bus 3M is transferred by the non-power-loss bus 4M, the capacity margin of the non-power-loss bus 2M is the sum of the capacity margin of the non-power-loss bus and the load power of the non-power-loss bus 3M, and the obtained sum is greater than or equal to the load power of the power-loss bus 1M.
When the criteria of A and B are met simultaneously, load sharing is carried out firstly before the standby power is switched, and the load of the non-power-loss bus 3M is transferred to the non-power-loss bus 4M so as to improve the capacity margin of the non-power-loss bus 2M. And secondly, after the load is equally divided, the bus 2M which is not in power failure is used for carrying out the backup power switching, so that the continuous switching load caused by overload of the No.2 main transformer of the backup power switching power supply can be prevented. The load sharing and spare power switching operation processes are as follows, namely, the QF03 is tripped, after the QF03 is confirmed to be in the split position, the QF34 is closed for transferring, after the QF34 is confirmed to be closed, the QF12 is closed again, the spare power switching operation is carried out on the bus 2M which is not in power loss, and the spare power automatic switching recovery power supply of the bus 1M which is in power loss is realized.
If overload of the standby power supply cannot be prevented through load sharing, or the standby power supply is overloaded without load sharing conditions, the combined load is adopted to ensure the operation safety of the standby power supply.
In order to reduce the cut load amount as much as possible on the premise of ensuring the operation safety of the standby power supply, an overload combined cutting improvement scheme is to adopt different combined cutting strategies according to the overload degree. The specific method comprises the following steps:
if the overload rate eta (i) is less than or equal to the preset overload rate eta set, selecting a spare power switching back-up load switching mode to cut off the overload load when the two non-power-loss buses are simultaneously switched into the power-loss buses;
if the overload rate eta (i) > the preset overload rate eta set, selecting a mode of combining the pre-cut load and the back-up switching load to cut off the overload load when the two non-power-lost buses are simultaneously power-lost buses, wherein the pre-cut load quantity is delta L= (L i-ΔS)-ηsetSN. If the standby power supply is still overloaded, carrying out secondary load cutting according to the actual overload quantity.
As shown in fig. 5, in an embodiment of the present invention, a single-section bus power-loss automatic switching control system for accessing a superconducting cable is provided, which is used for accessing a substation bus to a power grid with a multi-section structure of the superconducting cable, and includes:
a bus acquisition unit 110 for acquiring a power-off bus and a non-power-off bus on an adjacent side thereof;
The first backup power switching control unit 120 is configured to calculate a load margin of the single non-power-loss bus according to a preset incoming line capacity and a preset load power corresponding to the single non-power-loss bus when the obtained non-power-loss bus is only a single non-power-loss bus on an adjacent side of the power-loss bus and an incoming line of the single non-power-loss bus is not an accessed superconducting cable, and select the single non-power-loss bus to be directly backed up after determining that the load margin of the single non-power-loss bus is greater than or equal to the preset load power before power loss of the power-loss bus, so as to realize power restoration of the power-loss bus.
Wherein, still include:
and the second standby power switching control unit is used for calculating the load margin of the non-power-loss buses which are not connected with the superconducting cable according to the preset incoming capacity and the load power of the non-power-loss buses which are not connected with the superconducting cable when the obtained non-power-loss buses are two non-power-loss buses which are adjacent to each other and the incoming line of one non-power-loss bus is not a connected superconducting cable and the incoming line of the other non-power-loss bus is a connected superconducting cable, and selecting the non-power-loss buses which are not connected with the superconducting cable to directly switch back to the standby power after the load margin of the non-power-loss buses which are not connected with the superconducting cable is judged to be larger than or equal to the preset load power before the power-loss buses are powered off so as to realize the recovery power supply of the non-power-loss buses.
Wherein, still include:
And the third spare power switching control unit is used for calculating the load margin of the two non-power-loss buses according to the preset incoming line capacity and the load power of the corresponding two non-power-loss buses when the obtained non-power-loss buses are two non-power-loss buses on two adjacent sides of the power-loss bus and the incoming lines of the two non-power-loss buses are not the accessed superconducting cables, and selecting the direct spare power with the largest load margin among the two non-power-loss buses after judging that the load margin of at least one of the two non-power-loss buses is larger than or equal to the preset load power before the power-loss of the power-loss bus so as to realize the recovery power supply of the power-loss bus.
Wherein, still include:
A fourth backup power switching control unit, configured to, if it is determined that load margins of the two non-power-loss buses are smaller than load power preset before power-loss of the power-loss buses, and when at least one of the two non-power-loss buses shares the same wire with a corresponding non-power-loss bus other than the two non-power-loss buses, take one of the shared wires, switch loads of non-power-loss buses, which are not adjacent to the power-loss buses, in the taken wire, so that the load margin of the non-power-loss bus, which corresponds to the shared wire, in the two non-power-loss buses is greater than or equal to the load power preset before power-loss of the power-loss bus, and select the backup power switching of the non-power-loss bus, which corresponds to the shared wire, in the two non-power-loss buses, to realize power restoration of the power-loss bus, or
And taking all the shared incoming lines, and transferring the loads of non-power-down buses which are not adjacent to the power-down buses in all the taken incoming lines, so that after the load margin of the two non-power-down buses is larger than or equal to the preset load power before the power-down buses are powered down, any one of the two non-power-down buses can be selected for standby power switching so as to realize the recovery of the power supply of the power-down buses.
The embodiment of the invention has the following beneficial effects:
The invention is suitable for a power grid with a multi-segment structure, in which a substation bus is connected to a superconducting cable, comprehensively utilizes the condition that whether an incoming line of a non-power-loss bus is connected to the superconducting cable or not and whether the load margin of the non-power-loss bus is larger than or equal to the load power before power loss of the power-loss bus, is used for reasonably selecting a spare power supply between segments, can also avoid the occurrence of overload combined cut load condition, and improves the power supply reliability and continuity.
It should be noted that, in the above embodiment of the system, the included units are only divided according to the functional logic, but not limited to the above division, so long as the corresponding functions can be implemented, and the specific names of the functional units are only used for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (8)

1.一种超导电缆接入的单段母线失电备自投控制方法，其特征在于，用于变电站母线接入超导电缆的多分段结构的电网上，所述方法包括以下步骤：1. A method for controlling the power failure of a single-segment busbar connected to a superconducting cable, characterized in that it is used in a power grid with a multi-segment structure in which a substation busbar is connected to a superconducting cable, and the method comprises the following steps: 获取失电母线及其相邻侧的未失电母线；Obtain the de-energized busbar and the non-de-energized busbars on its adjacent side; 若所获取的未失电母线仅为失电母线相邻一侧的单条未失电母线，且该单条未失电母线的进线不为接入的超导电缆时，根据对应该单条未失电母线所预先设置的进线容量和负荷功率，计算出该单条未失电母线的负荷裕度，并待判定出该单条未失电母线的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择该单条未失电母线直接备投，以实现失电母线恢复供电；If the acquired non-de-energized bus is only a single non-de-energized bus on one side adjacent to the de-energized bus, and the incoming line of the single non-de-energized bus is not a connected superconducting cable, the load margin of the single non-de-energized bus is calculated according to the pre-set incoming line capacity and load power corresponding to the single non-de-energized bus, and after it is determined that the load margin of the single non-de-energized bus is greater than or equal to the pre-set load power before the de-energized bus loses power, the single non-de-energized bus is selected for direct standby, so as to restore power supply to the de-energized bus; 其中，所述方法进一步包括：Wherein, the method further comprises: 若所获取的未失电母线为失电母线相邻两侧的两条未失电母线，且其中一条未失电母线的进线不为接入的超导电缆，另一条未失电母线的进线为接入的超导电缆时，根据对应不接入超导电缆的未失电母线所预先设置的进线容量和负荷功率，计算出不接入超导电缆的未失电母线的负荷裕度，并待判定出不接入超导电缆的未失电母线的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择不接入超导电缆的未失电母线直接备投，以实现失电母线恢复供电。If the acquired non-de-energized busbars are two non-de-energized busbars on both sides of the de-energized busbar, and the incoming line of one of the non-de-energized busbars is not a connected superconducting cable, and the incoming line of the other non-de-energized busbar is a connected superconducting cable, the load margin of the non-de-energized busbar not connected to the superconducting cable is calculated according to the pre-set incoming line capacity and load power of the corresponding non-de-energized busbar not connected to the superconducting cable, and after it is determined that the load margin of the non-de-energized busbar not connected to the superconducting cable is greater than or equal to the pre-set load power before the de-energized busbar loses power, the non-de-energized busbar not connected to the superconducting cable is selected for direct standby, so as to restore power supply to the de-energized busbar. 2.如权利要求1所述的超导电缆接入的单段母线失电备自投控制方法，其特征在于，所述方法进一步包括：2. The method for controlling the power failure of a single-section busbar connected to a superconducting cable according to claim 1, characterized in that the method further comprises: 若所获取的未失电母线为失电母线相邻两侧的两条未失电母线，且这两条未失电母线的进线均不为接入的超导电缆时，根据对应两条未失电母线各自所预先设置的进线容量和负荷功率，计算出这两条未失电母线的负荷裕度，并待判定出这两条未失电母线之中至少有一条的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择这两条未失电母线之中负荷裕度最大的直接备投，以实现失电母线恢复供电。If the acquired non-de-energized busbars are two non-de-energized busbars on both sides of the de-energized busbar, and the incoming lines of the two non-de-energized busbars are not connected superconducting cables, the load margins of the two non-de-energized busbars are calculated according to the pre-set incoming line capacities and load powers of the two corresponding non-de-energized busbars, and after it is determined that the load margin of at least one of the two non-de-energized busbars is greater than or equal to the pre-set load power of the de-energized busbar before power is lost, the direct standby with the largest load margin among the two non-de-energized busbars is selected to restore power supply to the de-energized busbar. 3.如权利要求2所述的超导电缆接入的单段母线失电备自投控制方法，其特征在于，所述方法进一步包括：3. The method for controlling the power failure of a single-section busbar connected to a superconducting cable according to claim 2, characterized in that the method further comprises: 若判定出这两条未失电母线的负荷裕度均小于失电母线失电前所预先设置的负荷功率，且这两条未失电母线中至少一条与这两条未失电母线之外的相应一条未失电母线共用同一进线时，取共用进线之一，将所取进线中不与失电母线相邻的未失电母线负荷进行转供，以使这两条未失电母线中对应共用所取进线的未失电母线的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择这两条未失电母线中对应共用所取进线的未失电母线备投，以实现失电母线恢复供电；或If it is determined that the load margins of the two non-delivered buses are both less than the load power preset before the delivered bus loses power, and at least one of the two non-delivered buses shares the same incoming line with a corresponding non-delivered bus other than the two non-delivered buses, one of the shared incoming lines is selected, and the load of the non-delivered bus that is not adjacent to the delivered bus is transferred, so that the load margin of the non-delivered bus corresponding to the shared incoming line among the two non-delivered buses is greater than or equal to the load power preset before the delivered bus loses power, and the non-delivered bus corresponding to the shared incoming line among the two non-delivered buses is selected for standby, so as to restore power supply to the delivered bus; or 取共用进线之全部，将全部所取进线中不与失电母线相邻的未失电母线负荷均进行转供，以使这两条未失电母线的负荷裕度均大于等于失电母线失电前所预先设置的负荷功率后，可选择这两条未失电母线之中任一条未失电母线备投，以实现失电母线恢复供电。Take all the shared incoming lines and transfer the loads of the buses that are not adjacent to the de-energized busbar, so that the load margins of the two buses are greater than or equal to the load power pre-set before the de-energized busbar loses power. Then, any one of the two buses can be selected for standby to restore power to the de-energized busbar. 4.如权利要求3所述的超导电缆接入的单段母线失电备自投控制方法，其特征在于，所述方法进一步包括：4. The method for controlling the power failure of a single-section busbar connected to a superconducting cable according to claim 3, characterized in that the method further comprises: 若取共用进线之全部，且全部所取进线中不与失电母线相邻的未失电母线负荷均进行转供，仍使得这两条未失电母线的负荷裕度均小于失电母线失电前所预先设置的负荷功率时，根据失电母线失电前的所预先设置的负荷功率以及这两条未失电母线之中负荷功率最大的未失电母线的进线容量和负荷功率，计算出过负荷率，并将所述过负荷率与预设的过载率进行对比，且进一步根据对比结果，选择相应的负荷切换模式来切除这两条未失电母线同时备投失电母线时的过载负荷；其中，所述负荷切换模式为备投后联切负荷方式或综合有预切负荷与备投后联切负荷的方式。If all the shared incoming lines are taken, and the loads of the buses that are not adjacent to the de-energized busbar in all the taken incoming lines are all transferred, and the load margins of the two buses that are not de-energized are still less than the load power preset before the de-energized busbar loses power, the overload rate is calculated according to the load power preset before the de-energized busbar loses power and the incoming line capacity and load power of the bus that is not de-energized with the largest load power among the two buses that are not de-energized, and the overload rate is compared with the preset overload rate, and further according to the comparison result, the corresponding load switching mode is selected to cut off the overload load when the two buses that are not de-energized are simultaneously put into standby power supply to the de-energized busbar; wherein, the load switching mode is a load shedding mode after standby power supply or a combination of pre-cut load and load shedding mode after standby power supply. 5.如权利要求4所述的超导电缆接入的单段母线失电备自投控制方法，其特征在于，所述方法进一步包括：5. The method for controlling the power failure of a single-section busbar connected to a superconducting cable according to claim 4, characterized in that the method further comprises: 通过公式计算出过负荷率η；其中，Li为失电母线失电前所预先设置的负荷功率；ΔS为这两条未失电母线之中负荷功率最大的未失电母线的负荷裕度，且ΔS＝SN-LN；SN为这两条未失电母线之中负荷功率最大的未失电母线的进线容量；LN为这两条未失电母线之中负荷功率最大的未失电母线的所预先设置的负荷功率；By formula The overload rate η is calculated; wherein Li is the load power preset before the de-energized bus loses power; ΔS is the load margin of the non-de-energized bus with the largest load power among the two non-de-energized buses, and ΔS= SN - LN ; SN is the incoming line capacity of the non-de-energized bus with the largest load power among the two non-de-energized buses; LN is the pre-set load power of the non-de-energized bus with the largest load power among the two non-de-energized buses; 若所述过负荷率η(i)≤所述预设的过载率ηset，则选择备投后联切负荷方式来切除这两条未失电母线同时备投失电母线时的过载负荷；If the overload rate η(i) ≤ the preset overload rate η set , then the load shedding mode after standby switching is selected to cut off the overload when the two buses that have not lost power are switched to the power-lost bus at the same time; 若所述过负荷率η(i)>所述预设的过载率ηset，则选择综合有预切负荷与备投后联切负荷的方式来切除这两条未失电母线同时备投失电母线时的过载负荷；其中，预切负荷量为ΔL＝(Li-ΔS)-ηsetSN。If the overload rate η(i)>the preset overload rate η set , a combination of pre-cut load and standby load shedding is selected to shear off the overload when the two buses are in standby mode and the power-off bus is switched to standby mode; wherein the pre-cut load is ΔL=(L i -ΔS)-η set S N . 6.一种超导电缆接入的单段母线失电备自投控制系统，用于变电站母线接入超导电缆的多分段结构的电网上，其特征在于，包括：6. A single-section busbar power failure automatic switching control system connected to a superconducting cable, used in a power grid with a multi-segment structure where a substation busbar is connected to a superconducting cable, characterized in that it includes: 母线获取单元，用于获取失电母线及其相邻侧的未失电母线；A bus acquisition unit, used to acquire the de-energized bus and the non-de-energized bus on its adjacent side; 第一备投控制单元，用于若所获取的未失电母线仅为失电母线相邻一侧的单条未失电母线，且该单条未失电母线的进线不为接入的超导电缆时，根据对应该单条未失电母线所预先设置的进线容量和负荷功率，计算出该单条未失电母线的负荷裕度，并待判定出该单条未失电母线的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择该单条未失电母线直接备投，以实现失电母线恢复供电；The first standby control unit is used to calculate the load margin of the single non-delivery bus according to the pre-set incoming line capacity and load power corresponding to the single non-delivery bus if the acquired non-delivery bus is only a single non-delivery bus on one side adjacent to the delivery bus, and the incoming line of the single non-delivery bus is not a connected superconducting cable, and after determining that the load margin of the single non-delivery bus is greater than or equal to the pre-set load power before the delivery bus loses power, select the single non-delivery bus to directly standby, so as to restore power supply to the delivered bus; 其中，还包括：Among them, it also includes: 第二备投控制单元，用于若所获取的未失电母线为失电母线相邻两侧的两条未失电母线，且其中一条未失电母线的进线不为接入的超导电缆，另一条未失电母线的进线为接入的超导电缆时，根据对应不接入超导电缆的未失电母线所预先设置的进线容量和负荷功率，计算出不接入超导电缆的未失电母线的负荷裕度，并待判定出不接入超导电缆的未失电母线的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择不接入超导电缆的未失电母线直接备投，以实现失电母线恢复供电。The second standby control unit is used for, if the acquired non-power-off busbars are two non-power-off busbars on both sides of the power-off busbar, and the incoming line of one of the non-power-off busbars is not a connected superconducting cable, and the incoming line of the other non-power-off busbar is a connected superconducting cable, calculating the load margin of the non-power-off busbar not connected to the superconducting cable according to the pre-set incoming line capacity and load power of the corresponding non-power-off busbar not connected to the superconducting cable, and after determining that the load margin of the non-power-off busbar not connected to the superconducting cable is greater than or equal to the pre-set load power before the power-off busbar loses power, selecting the non-power-off busbar not connected to the superconducting cable for direct standby, so as to realize the restoration of power supply to the power-off busbar. 7.如权利要求6所述的超导电缆接入的单段母线失电备自投控制方法，其特征在于，还包括：7. The method for controlling the power failure of a single-section busbar connected to a superconducting cable according to claim 6, characterized in that it also includes: 第三备投控制单元，用于若所获取的未失电母线为失电母线相邻两侧的两条未失电母线，且这两条未失电母线的进线均不为接入的超导电缆时，根据对应两条未失电母线各自所预先设置的进线容量和负荷功率，计算出这两条未失电母线的负荷裕度，并待判定出这两条未失电母线之中至少有一条的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择这两条未失电母线之中负荷裕度最大的直接备投，以实现失电母线恢复供电。The third standby control unit is used for calculating the load margin of the two buses that have not lost power according to the pre-set incoming line capacity and load power of the two corresponding buses that have not lost power, if the acquired non-power-loss busbars are two non-power-loss busbars on both sides of the power-loss busbar, and the incoming lines of the two buses that have not lost power are not the connected superconducting cables, and after it is determined that the load margin of at least one of the two buses that have not lost power is greater than or equal to the load power pre-set before the power-loss busbar loses power, selecting the direct standby with the largest load margin among the two buses that have not lost power to realize the restoration of power supply to the power-loss busbar. 8.如权利要求7所述的超导电缆接入的单段母线失电备自投控制方法，其特征在于，还包括：8. The method for controlling the power failure of a single-section busbar connected to a superconducting cable according to claim 7, characterized in that it also includes: 第四备投控制单元，用于若判定出这两条未失电母线的负荷裕度均小于失电母线失电前所预先设置的负荷功率，且这两条未失电母线中至少一条与这两条未失电母线之外的相应一条未失电母线共用同一进线时，取共用进线之一，将所取进线中不与失电母线相邻的未失电母线负荷进行转供，以使这两条未失电母线中对应共用所取进线的未失电母线的负荷裕度大于等于失电母线失电前所预先设置的负荷功率后，选择这两条未失电母线中对应共用所取进线的未失电母线备投，以实现失电母线恢复供电；或The fourth standby control unit is used for taking one of the shared incoming lines, and transferring the load of the non-powered bus that is not adjacent to the power-lost bus in the taken incoming line, if it is determined that the load margins of the two non-powered buses are both less than the load power preset before the power-lost bus loses power, and at least one of the two non-powered buses shares the same incoming line with a corresponding non-powered bus other than the two non-powered buses, so that the load margin of the non-powered bus that corresponds to the shared taken incoming line among the two non-powered buses is greater than or equal to the load power preset before the power-lost bus loses power, and then selecting the non-powered bus that corresponds to the shared taken incoming line among the two non-powered buses for standby, so as to restore power supply to the power-lost bus; or 取共用进线之全部，将全部所取进线中不与失电母线相邻的未失电母线负荷均进行转供，以使这两条未失电母线的负荷裕度均大于等于失电母线失电前所预先设置的负荷功率后，可选择这两条未失电母线之中任一条未失电母线备投，以实现失电母线恢复供电。Take all the shared incoming lines and transfer the loads of the buses that are not adjacent to the de-energized busbar, so that the load margins of the two buses are greater than or equal to the load power pre-set before the de-energized busbar loses power. Then, any one of the two buses can be selected for standby to restore power to the de-energized busbar.
CN202111437914.0A 2021-11-30 2021-11-30 A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable Active CN114006467B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111437914.0A CN114006467B (en) 2021-11-30 2021-11-30 A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111437914.0A CN114006467B (en) 2021-11-30 2021-11-30 A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable

Publications (2)

Publication Number Publication Date
CN114006467A CN114006467A (en) 2022-02-01
CN114006467B true CN114006467B (en) 2025-05-13

Family

ID=79930792

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111437914.0A Active CN114006467B (en) 2021-11-30 2021-11-30 A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable

Country Status (1)

Country Link
CN (1) CN114006467B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186881A (en) * 2020-09-14 2021-01-05 深圳供电局有限公司 Optimized switching method and system for automatic switching device of standby power supply

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4399763B2 (en) * 2003-02-28 2010-01-20 住友電気工業株式会社 DC superconducting cable line
CN103956748B (en) * 2014-03-31 2016-01-06 国家电网公司 The fault recovery scheme generation method of load transfer plan during a kind of many bus loss of pressure
CN105514989B (en) * 2015-12-10 2018-04-27 国网四川省电力公司成都供电公司 A kind of urban distribution network service restoration method based on 10kV feeder line prepared auto restarts
CN112350309B (en) * 2020-10-29 2022-06-07 中铁第四勘察设计院集团有限公司 Self-healing power supply system for urban rail transit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186881A (en) * 2020-09-14 2021-01-05 深圳供电局有限公司 Optimized switching method and system for automatic switching device of standby power supply

Also Published As

Publication number Publication date
CN114006467A (en) 2022-02-01

Similar Documents

Publication Publication Date Title
CN115800206A (en) Control method and device of energy storage system, computer equipment and medium
CN106787141A (en) A kind of extension spare power automatic switching method of 10kV switchyards interconnection
CN110912253B (en) Low-voltage intelligent spare power automatic switching system
CN214958763U (en) Multi-cluster parallel energy storage system applied to high-voltage direct-current equipment
CN110932395B (en) Communication system of low-voltage intelligent spare power automatic switching
CN106208341A (en) A kind of one-end substation main power source or main transformer fault cause the bus rapidly self-healing method of no-voltage of entire station
CN111865669A (en) An intelligent decision-making system and method for power grid fault recovery
Runde Application of high-T/sub c/superconductors in aluminum electrolysis plants
CN213185613U (en) Power distribution system for large data center
CN114006467B (en) A method and system for controlling automatic switching of a single-section busbar power failure backup connected to a superconducting cable
CN112713611A (en) Grid-connected and off-grid automatic switching method, system and device, electronic equipment and electric cabinet
CN116154790A (en) Self-adaptive load unloading method and automatic power supply conversion system
CN112186881B (en) Optimized switching method and system for automatic switching device of standby power supply
KR102664844B1 (en) Closed loop distribution line control system and closed loop distribution line control method using the same
CN118841939A (en) Parallel operation control method for transformers
CN112510706A (en) A close ring circuit with mother for 10kV distribution network
CN117674122A (en) Distributed fault self-healing recovery method and system for active power distribution network
CN211606099U (en) Double-ring network loop-closing operation inter-ring contact type power distribution network
CN112260243B (en) Method for reducing short-circuit current of transformer substation by using fault current limiter
CN113162005A (en) Medium voltage distribution network system
CN111313377B (en) Station domain protection method and device integrating centralized reclosure
US12088132B2 (en) Method and apparatus for extending substation battery life
CN222654834U (en) IT equipment power supply and distribution electrical architecture
CN120016586B (en) A control method for offshore wind power transmission via multi-terminal flexible direct current
RU2786190C1 (en) Method and device for seasonal power supply backup with the allocation of three groups of consumers

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant