CN114123133B - A method for online setting configuration of the second stage of ground distance protection on the access side of distributed direct-drive wind power - Google Patents
A method for online setting configuration of the second stage of ground distance protection on the access side of distributed direct-drive wind power Download PDFInfo
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- CN114123133B CN114123133B CN202111429852.9A CN202111429852A CN114123133B CN 114123133 B CN114123133 B CN 114123133B CN 202111429852 A CN202111429852 A CN 202111429852A CN 114123133 B CN114123133 B CN 114123133B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- 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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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Abstract
The invention discloses a distributed direct-driven wind power access point grounding distance II section protection online setting configuration method, which comprises the following steps: step S1, after a fault occurs, a protection starting element is started, and a relay protection device at a distributed direct-drive wind power station acquires a measured voltage and a measured current at a protection installation station; step S2, the fault phase selection element judges whether the fault is a single-phase earth fault, if so, the measured impedance is calculated according to the measured voltage and the measured current, and the output current of the distributed direct-drive wind power after the fault is calculated; step S3, carrying out online calculation of a grounding distance protection II section constant value according to the output current of the distributed direct-drive wind power; and S4, judging whether the grounding distance protection II section acts or not according to the online calculation of the measured impedance and the grounding distance protection II section fixed value. The invention provides a setting basis and a protection criterion for the distance protection II section of the 110kV line distributed direct-drive wind power access side, so that the grounding distance protection II section can protect the whole length of the line.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a distributed direct-driven wind power access side grounding distance protection II-stage online setting configuration method.
Background
In the traditional power grid, distributed direct-drive wind power access is generally not considered, and distance protection is not configured on the line load side. However, after the distributed direct-driven wind power is connected into the power grid system, the system is not radial, the current and power flow directions of the system are not fixed, and the distributed direct-driven wind power side of the line is required to be provided with distance protection. Because distributed direct-driven wind power generally adopts a fault control strategy for inhibiting negative sequence current, under the condition of symmetric and asymmetric faults of a power grid, the distributed direct-driven wind power only outputs positive sequence current, no negative sequence current or zero sequence current exists, the fault characteristics are different from those of a conventional alternating-current synchronous motor, and the adaptability problem exists in distance protection configuration based on the fault characteristics of the conventional alternating-current synchronous motor. Therefore, for the distance protection analysis on the distributed direct-driven wind power output line, the fault characteristic of the distributed direct-driven wind power should be considered, in addition, the cooperation of the distance protection II section and the adjacent line protection should also be considered, and a new grounding distance protection II section setting scheme should be proposed accordingly.
Disclosure of Invention
The invention aims to solve the technical problem of providing an online setting configuration method for a distributed direct-driven wind power access side grounding distance protection II section so as to provide setting basis and protection criteria for the distributed direct-driven wind power access side distance protection II section of a 110kV line.
In order to solve the technical problems, the invention provides a distributed direct-drive wind power access side grounding distance protection II section online setting configuration method, which comprises the following steps:
step S1, after a fault occurs, a protection starting element is started, and a relay protection device at a distributed direct-drive wind power station acquires a measured voltage and a measured current at a protection installation station;
step S2, the fault phase selection element judges whether the fault is a single-phase earth fault, if so, the measured impedance is calculated according to the measured voltage and the measured current, and the output current of the distributed direct-drive wind power after the fault is calculated;
step S3, carrying out online calculation of a grounding distance protection II section constant value according to the output current of the distributed direct-drive wind power;
And S4, judging whether the grounding distance protection II section acts or not according to the online calculation of the measured impedance and the grounding distance protection II section fixed value.
Further, in the step S2, a voltage is measuredAnd measuring the currentCalculating a measured impedance Z m:
Wherein, AndIs the phase voltage and phase current of the fault phase,And k AB is the zero sequence compensation coefficient of the tie line AB.
Further, calculating the output current of the distributed direct-drive wind power after the fault specifically comprises:
Based on the measured voltage And measuring the currentCalculating the dropping degree k UT of the voltage at the protection installation place:
Calculating output reactive current i q of the direct-drive fan;
calculating the output active current i d of the direct-drive fan;
And calculating the output current I dg of the distributed direct-drive wind power.
Further, the manner of calculating the drop degree k UT of the voltage at the protection installation place is as follows: Wherein, Z T is 110kV transformer impedance, which is the phase voltage and phase current in normal operation.
Further, the mode of calculating the output reactive current i q of the direct-drive fan is as follows:
U T is the protection mounting voltage.
Further, the method for calculating the output active current i d of the direct-drive fan is as follows: The maximum output current after the distributed direct-drive wind power failure is obtained.
Further, the step S3 of performing online calculation of the grounding distance protection II segment constant value specifically includes:
Calculating a zero sequence compensation coefficient k AB＝(ZAB(0)-ZAB(1))/(3ZAB(1) of the tie line AB);
calculating a zero sequence compensation coefficient k BC＝(ZBC(0)-ZBC(1))/(3ZBC(1) of a downstream line BC;
Calculating positive sequence branching coefficients
Calculating a zero sequence branch coefficient k b(0)＝(ZS(0)+ZAB(0)+ZT)/ZS(0);
Calculating the grounding distance protection II section setting impedance
Wherein, In order for the coefficient of reliability to be a good factor,For the protection of the grounding distance of the downstream line BC, the impedance is set for the I section, E S is the equivalent power supply potential of the power grid side, Z S(1) is the zero-sequence equivalent impedance of the power grid side in the minimum operation mode, Z S(1),ZS(0) is the zero-sequence equivalent impedance of the power grid side in the minimum operation mode, Z AB(1) is the positive-sequence impedance of the connecting line AB, Z AB(0) is the zero-sequence impedance of the connecting line AB, Z BC(1) is the positive-sequence impedance of the downstream line BC, and Z BC(0) is the zero-sequence impedance of the downstream line BC.
Further, the step S4 specifically includes:
to adjust the impedance in the impedance plane When the measured impedance Z m falls outside the circle, the grounding distance protects the section II from action; if the measured impedance Z m falls within the circle, the II-stage delay is protected by the grounding distanceAnd then, the grounding distance protects the section II to act, and a tripping instruction is sent to the circuit breaker.
Further, the grounding distance protects the II-section delay0.3S.
The implementation of the invention has the following beneficial effects: the invention provides a setting basis and a protection criterion for the distance protection II section of the distributed direct-drive wind power access side of the 110kV line, so that the grounding distance protection II section can protect the whole length of the line, has a larger protection range on the adjacent line, can reliably act in the fault in the area, and can not surpass the misoperation in the fault out of the area.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a typical distributed direct drive wind power system.
Fig. 2 is a schematic flow chart of a distributed direct-driven wind power access side grounding distance protection II section online setting configuration method according to an embodiment of the invention.
Fig. 3 is a specific flow chart of a distributed direct-driven wind power access side grounding distance protection II segment online setting configuration method according to an embodiment of the invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced.
As shown in FIG. 1, a typical distributed direct-driven wind power system mainly comprises a power grid side equivalent power supply (1), a power grid side equivalent impedance (2), distributed direct-driven wind power (3), a distributed direct-driven wind power local load (4), a 110kV transformer (5), a 110kV connecting line AB (6), a relay protection device (7) and a downstream line BC (8). The distributed direct-driven wind power is connected to a connecting line AB through a 110kV transformer, the 110kV transformer adopts an YNd11 wiring mode, and the distributed direct-driven wind power after faults adopts a negative sequence current control strategy.
The system parameters are as follows: the power grid side equivalent power supply potential E S, the positive sequence, zero sequence equivalent impedance Z S(1)、ZS(0), 110kV transformer impedance Z T, the tie line AB positive sequence, zero sequence impedance Z AB(1)、ZAB(0), the downstream line BC positive sequence, zero sequence impedance Z BC(1)、ZBC(0) and the maximum output current after distributed direct-drive wind power failure are I dgmax under the power grid side minimum operation mode.
The relay protection device (7) on the connecting line is provided with a grounding distance protection II section which is matched with a grounding distance protection I section of the downstream line BC, and the protection range of the grounding distance protection II section of the downstream line is not exceeded.
Referring to fig. 2, an embodiment of the present invention provides a method for online setting and configuring a II-stage protection for a grounding distance of a distributed direct-drive wind power access, including:
step S1, after a fault occurs, a protection starting element is started, and a relay protection device at a distributed direct-drive wind power station acquires a measured voltage and a measured current at a protection installation station;
step S2, the fault phase selection element judges whether the fault is a single-phase earth fault, if so, the measured impedance is calculated according to the measured voltage and the measured current, and the output current of the distributed direct-drive wind power after the fault is calculated;
Step S3, performing on-line calculation of a grounding distance protection II section fixed value according to the output current of the distributed direct-drive wind power;
And S4, judging whether the grounding distance protection II section acts or not according to the on-line calculation of the measured impedance and the grounding distance protection II section fixed value.
Specifically, as shown in fig. 3, after the fault occurs, the protection starting element is started first. Measuring voltage of protection installation part obtained by relay protection device at distributed direct-drive wind power partAnd measuring the currentThen, the fault phase selection element judges whether the fault is a single-phase earth fault or not. If not, other fault types are needed; if yes, according to the measured voltageAnd measuring the currentCalculating a measured impedance Z m:
Wherein, AndIs the phase voltage and phase current of the fault phase,Is zero sequence current.
After judging that the fault type is single-phase ground fault, further calculating the output current of the distributed direct-drive wind power after the fault, and mainly comprising the following steps.
Firstly, calculating the dropping degree of the voltage at the protection installation place:
From measuring voltage And measuring the currentThe voltage drop degree k UT of the installation part can be protected:
Wherein the method comprises the steps of Phase voltage and phase current during normal operation;
Calculating output reactive current i q of the direct-drive fan:
calculating the output active current of the direct-drive fan
Calculating distributed direct-drive wind power output currentAnd per-unit.
After the calculation of the distributed direct-driven wind power output current is completed, the on-line calculation of the grounding distance protection II section constant value is carried out, and the method mainly comprises the following steps:
Calculating a zero sequence compensation coefficient k AB＝(ZAB(0)-ZAB(1))/(3ZAB(1) of the tie line AB);
calculating a zero sequence compensation coefficient k BC＝(ZBC(0)-ZBC(1))/(3ZBC(1) of a downstream line BC
Calculating positive sequence branching coefficients
Calculating zero sequence branch coefficient k b(0)＝(ZS(0)+ZAB(0)+ZT)/ZS(0)
According to the data, calculating the grounding distance protection II section setting impedanceCalculated from the following formula:
Wherein, Is a reliable coefficient; The impedance is set for the downstream line BC ground distance protection section I. When the downstream line BC is grounded for 80% of the full length of protection for the protection I segment,
After finishing the on-line calculation of the measured impedance and the grounding distance protection II section fixed value, setting the impedance on the impedance planeWhen the measured impedance Z m falls outside the circle, the grounding distance protects the section II from action; if the measured impedance Z m falls within the circle, the II-stage delay is protected by the grounding distanceAnd then, the grounding distance protects the section II to act, and a tripping instruction is sent to the circuit breaker. Typically, the ground distance protects the phase II delayIt may be 0.3s.
From the above description, the beneficial effects of the invention are as follows: the invention provides a setting basis and a protection criterion for the distance protection II section of the distributed direct-drive wind power access side of the 110kV line, so that the grounding distance protection II section can protect the whole length of the line, has a larger protection range on the adjacent line, can reliably act in the fault in the area, and can not surpass the misoperation in the fault out of the area.
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 (4)
1. The distributed direct-driven wind power access side grounding distance protection II section online setting configuration method is characterized by comprising the following steps of:
step S1, after a fault occurs, a protection starting element is started, and a relay protection device at a distributed direct-drive wind power station acquires a measured voltage and a measured current at a protection installation station;
step S2, the fault phase selection element judges whether the fault is a single-phase earth fault, if so, the measured impedance is calculated according to the measured voltage and the measured current, and the output current of the distributed direct-drive wind power after the fault is calculated;
step S3, carrying out online calculation of a grounding distance protection II section constant value according to the output current of the distributed direct-drive wind power;
step S4, judging whether the grounding distance protection II section acts or not according to the online calculation of the measured impedance and the grounding distance protection II section fixed value;
in the step S2, according to the measured voltage And measuring the currentCalculating a measured impedance Z m:
Wherein, AndIs the phase voltage and phase current of the fault phase,K AB is zero sequence current and k AB is zero sequence compensation coefficient of the tie line AB;
calculating the output current of the distributed direct-drive wind power after the fault specifically comprises the following steps:
Based on the measured voltage And measuring the currentCalculating the dropping degree k UT of the voltage at the protection installation place:
calculating a distributed direct-drive wind power output reactive current i q;
calculating a distributed direct-drive wind power output active current i d;
calculating output current I dg of distributed direct-drive wind power;
The manner of calculating the drop degree k UT of the voltage at the protection installation place is as follows: Wherein, Z T is 110kV transformer impedance, which is phase voltage and phase current during normal operation;
The mode for calculating the distributed direct-drive wind power output reactive current i q is as follows:
u T is the voltage at the protection installation site;
The mode for calculating the distributed direct-drive wind power output active current i d is as follows: I dgmax is the maximum output current after the distributed direct-driven wind power fails;
The mode for calculating the output current I dg of the distributed direct-drive wind power is as follows: and per-unit.
2. The method according to claim 1, wherein the step S3 of performing online calculation of the ground distance protection II segment constant value specifically includes:
Calculating a zero sequence compensation coefficient k AB＝(ZAB(0)-ZAB(1))/(3ZAB(1) of the tie line AB);
calculating a zero sequence compensation coefficient k BC＝(ZBC(0)-ZBC(1))/(3ZBC(1) of a downstream line BC;
Calculating positive sequence branching coefficients
Calculating a zero sequence branch coefficient k b(0)＝(ZS(0)+ZAB(0)+ZT)/ZS(0);
Calculating the grounding distance protection II section setting impedance
Wherein, In order for the coefficient of reliability to be a good factor,For the protection of the grounding distance of the downstream line BC, the impedance is set for the I section, E S is the equivalent power supply potential of the power grid side, Z S(1) is the positive sequence equivalent impedance in the minimum operation mode of the power grid side, Z S(0) is the zero sequence equivalent impedance in the minimum operation mode of the power grid side, Z AB(1) is the positive sequence impedance of the connecting line AB, Z AB(0) is the zero sequence impedance of the connecting line AB, Z BC(1) is the positive sequence impedance of the downstream line BC, and Z BC(0) is the zero sequence impedance of the downstream line BC.
3. The method according to claim 2, wherein the step S4 specifically includes:
to adjust the impedance in the impedance plane When the measured impedance Z m falls outside the circle, the grounding distance protects the section II from action; if the measured impedance Z m falls within the circle, the II-stage delay is protected by the grounding distanceAnd then, the grounding distance protects the section II to act, and a tripping instruction is sent to the circuit breaker.
4. A method according to claim 3, characterized in that the ground distance is protected against a phase II delay0.3S.
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| CN103730882A (en) * | 2013-12-24 | 2014-04-16 | 西安交通大学 | Current protection system and method for being automatically adapted to distributed power connection |
| CN112952775A (en) * | 2021-02-26 | 2021-06-11 | 国网河南省电力公司电力科学研究院 | Method for protecting voltage quantity of power distribution network containing distributed photovoltaic power supply |
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| RU2426998C2 (en) * | 2008-05-13 | 2011-08-20 | Александр Никандорович Висящев | Method for determining place of failure on overhead transmission lines |
| US10908202B1 (en) * | 2020-09-15 | 2021-02-02 | North China Electric Power University | High-frequency fault component based distance protection system and method for a transmission line of a renewable energy source system |
| CN113437734B (en) * | 2021-08-30 | 2021-12-31 | 国网江西省电力有限公司电力科学研究院 | Fault protection method and device suitable for wind power plant output line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103730882A (en) * | 2013-12-24 | 2014-04-16 | 西安交通大学 | Current protection system and method for being automatically adapted to distributed power connection |
| CN112952775A (en) * | 2021-02-26 | 2021-06-11 | 国网河南省电力公司电力科学研究院 | Method for protecting voltage quantity of power distribution network containing distributed photovoltaic power supply |
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