CN109787286B - Photovoltaic low voltage safety control and intelligent regulation comprehensive equipment - Google Patents
Photovoltaic low voltage safety control and intelligent regulation comprehensive equipment Download PDFInfo
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Abstract
本申请公开一种光伏低压安全控制及智能调节综合设备，包括测控装置，以及用于连接在光伏发电系统进线和扰动负载之间的操作开关；测控装置包括：连接操作开关的驱动控制模块，连接光伏发电系统进线的采集模块，以及分别连接驱动控制模块、采集模块的处理器；处理器用于连接终端；处理器接收并处理电能参数信息，得到处理结果；并在处理结果满足反孤岛调整条件时，生成反孤岛请求信号，并将反孤岛请求信号传输给终端；处理器还用于根据反孤岛执行信号，导通相应的操作开关，进而实现了实时的进行反孤岛处理，减少了消除孤岛的成本，提高了系统运行的可靠性。
The present application discloses a photovoltaic low-voltage safety control and intelligent regulation integrated device, including a measurement and control device, and an operating switch used to connect between the incoming line of a photovoltaic power generation system and a disturbance load; the measurement and control device includes: a drive control module connected to the operating switch, a collection module connected to the incoming line of the photovoltaic power generation system, and a processor connected to the drive control module and the collection module respectively; the processor is used to connect to a terminal; the processor receives and processes electric energy parameter information to obtain a processing result; and when the processing result meets the anti-islanding adjustment condition, an anti-islanding request signal is generated, and the anti-islanding request signal is transmitted to the terminal; the processor is also used to turn on the corresponding operating switch according to the anti-islanding execution signal, thereby realizing real-time anti-islanding processing, reducing the cost of eliminating islands, and improving the reliability of system operation.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to comprehensive equipment for photovoltaic low-voltage safety control and intelligent regulation.
Background
At present, the distributed photovoltaic power generation system is mostly distributed in a low-voltage distribution area, and three-phase four-wire system is used for supplying power to user equipment, so that the distributed photovoltaic power generation system is a power supply network for mixing three-phase production power and single-phase load power. Because of uncontrollable capacity increase of single-phase users, high-power single-phase load access and different power consumption of the single-phase load, unbalance of the three-phase load can be caused, and therefore the safe and stable operation of the system is influenced. Meanwhile, the distributed photovoltaic power generation mostly belongs to grid connection at a user side, the output and the load are balanced nearby, and the problem of island effect exists, namely when a switch connected with a power grid is disconnected, the photovoltaic power generation system still keeps continuously supplying power to the voltage-losing power grid due to the fact that the output and the load are balanced nearby. When electric power overhauling personnel are maintaining the photovoltaic power generation system, the electric power overhauling personnel can be injured by personnel due to electrification of a circuit.
In the implementation process, the inventor finds that at least the following problems exist in the traditional technology, namely the traditional anti-islanding device for actively eliminating islanding has single function, and when in operation, an maintainer needs to perform on-site manual operation, so that the cost of manpower and material resources is high, and the reliability is low.
Disclosure of Invention
Based on the above, it is necessary to provide a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation, aiming at the problem of low reliability of island elimination in the traditional photovoltaic low-voltage distribution transformer area.
In order to achieve the above purpose, the embodiment of the invention provides a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation, which comprises a measurement and control device and an operation switch, wherein the operation switch is used for being connected between an incoming line and a disturbance load of a photovoltaic power generation system, and the measurement and control device comprises:
the driving control module is used for driving the on-off of the operation switch;
the acquisition module is used for acquiring electric energy parameter information of the incoming line of the photovoltaic power generation system;
The device comprises a driving control module, a collecting module, a processor and a processor, wherein the driving control module and the collecting module are respectively connected with the processor, the processor is used for connecting a terminal, the processor receives and processes electric energy parameter information to obtain a processing result, an anti-island request signal is generated and transmitted to the terminal when the processing result meets an anti-island adjusting condition, the anti-island request signal is used for indicating the terminal to generate an anti-island executing signal and transmitting the anti-island executing signal to the processor, and the processor is further used for conducting corresponding operation switches according to the anti-island executing signal.
In one embodiment, the system further comprises a phase change switch connected between the incoming line of the photovoltaic power generation system and a photovoltaic grid-connected switch in the photovoltaic grid-connected box;
When the processing result meets the three-phase unbalance adjustment condition, the processor switches the corresponding phase change switch so as to reduce the three-phase unbalance;
The anti-island request signal is also used for indicating the terminal to generate a second anti-island execution signal and transmitting the second anti-island execution signal to the processor, and the processor is also used for switching the corresponding phase change switch according to the second anti-island execution signal so as to increase the three-phase unbalance.
In one embodiment, the three-phase imbalance adjustment condition is that the three-phase imbalance of the corresponding electric energy parameter information is greater than a first preset threshold value, and the processor is further used for switching the corresponding phase change switch when the processing result is that the three-phase imbalance of the corresponding electric energy parameter information is greater than the first preset threshold value;
The processor is further used for generating an anti-islanding request signal when the processing result is that the value of the electric energy parameter information is larger than the second preset threshold value.
In one embodiment, the measurement and control device further comprises:
the first communication module is used for respectively connecting the terminal and the processor;
The second communication module is used for being connected with the phase change switch and the processor respectively.
In one embodiment, the first communication module is a wireless public network communication module or a power private network communication module;
the second communication module is a LoRa communication module or a power line carrier communication module.
In one embodiment, the second communication module is further configured to connect to a photovoltaic grid-connected switch;
The anti-islanding request signal is also used for indicating the terminal to generate a third anti-islanding execution signal and transmitting the third anti-islanding execution signal to the processor through the first communication module;
The second communication module receives the driving signals transmitted by the processor and transmits the driving signals to the corresponding photovoltaic grid-connected switch, and the driving signals are used for indicating the disconnection of the photovoltaic grid-connected switch.
In one embodiment, the second communication module is further configured to connect to a meter of the photovoltaic grid-tie box.
In one embodiment, the photovoltaic power generation system further comprises an electric locking module connected between the operation switch and a grid-connected inlet switch of the photovoltaic power generation system, and a time delay protection device connected with the operation switch.
In one embodiment, the delay protection device comprises an intermediate relay and a time relay which are respectively connected with the operation switch, wherein the intermediate relay is connected with the time relay.
In one embodiment, the system also comprises a cabinet body for installing a measurement and control device, a disturbance load and an operation switch;
the cabinet body is an upper rod type cabinet body, a wall-mounted cabinet body or a floor type cabinet body.
One of the above technical solutions has the following advantages and beneficial effects:
Based on the operation switch connection between photovoltaic power generation system inlet wire and disturbance load, drive control module connects operation switch, and collection module connects photovoltaic power generation system inlet wire, and drive control module, collection module and terminal are connected respectively to the treater. The processor can receive and process the electric energy parameter information to obtain a processing result, and when the processing result meets the anti-island adjustment condition, an anti-island request signal is generated and transmitted to the terminal, so that the terminal generates an anti-island execution signal according to the anti-island request signal and transmits the anti-island execution signal to the processor, and the processor can conduct a corresponding operation switch according to the anti-island execution signal. When the photovoltaic power generation system performs island operation, the disturbance load is input to perform anti-island treatment by switching on the corresponding operation switch, so that the non-planned island operation is destroyed, the cost of the anti-island treatment is reduced, and the reliability of the system operation is improved.
Drawings
FIG. 1 is a schematic diagram of a first configuration of a photovoltaic low-voltage safety control and intelligent regulation integrated device according to one embodiment;
FIG. 2 is a schematic diagram of a second configuration of a photovoltaic low-voltage safety control and intelligent regulation integrated device according to one embodiment;
FIG. 3 is a schematic diagram of a third configuration of a photovoltaic low-voltage safety control and intelligent regulation integrated device according to one embodiment;
FIG. 4 is a fourth schematic diagram of a photovoltaic low-voltage safety control and intelligent regulation integrated device according to an embodiment;
FIG. 5 is a schematic diagram of a fifth configuration of a photovoltaic low-voltage safety control and intelligent regulation integrated device according to one embodiment;
FIG. 6 is a schematic diagram of the structure of the upper pole type cabinet in one embodiment;
FIG. 7 is a schematic diagram of a wall-mounted cabinet in one embodiment;
FIG. 8 is a schematic diagram of a floor cabinet in one embodiment;
fig. 9 is a schematic diagram of an internal configuration of a cabinet of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to solve the problem of low reliability of island elimination in a conventional photovoltaic low-voltage distribution transformer area, an embodiment of the present application provides a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation, and fig. 1 is a schematic diagram of a first structure of the comprehensive device for photovoltaic low-voltage safety control and intelligent regulation in one embodiment. As shown in fig. 1, the photovoltaic power generation system comprises a measurement and control device 110 and an operation switch 120 used for being connected between the incoming line of the photovoltaic power generation system and a disturbance load, wherein the measurement and control device 110 comprises:
the driving control module 111 is connected with the operation switch 120, and the driving control module 111 is used for driving the on-off of the operation switch;
The acquisition module 113 is used for acquiring electric energy parameter information of the incoming line of the photovoltaic power generation system;
The device comprises a driving control module 111, a processor 115 connected with the collecting module 113, a processor 115 connected with the terminal, the processor 115 receives and processes electric energy parameter information to obtain a processing result, generates an anti-islanding request signal and transmits the anti-islanding request signal to the terminal when the processing result meets an anti-islanding adjustment condition, the anti-islanding request signal is used for indicating the terminal to generate an anti-islanding execution signal and transmitting the anti-islanding execution signal to the processor 115, and the processor 115 is further used for conducting a corresponding operation switch 120 according to the anti-islanding execution signal.
The measurement and control device 110 refers to a device with functions of signal measurement, signal processing, control, and the like. The incoming line of the photovoltaic power generation system refers to an incoming line end of the photovoltaic power generation system. The disturbance load can be a resistor device, and after being input to the incoming line end of the photovoltaic power generation system, the disturbance load can cause the undervoltage protection action of the photovoltaic power generation system. The operation switch 120 is a switching element having a large current breaking capacity, and for example, the operation switch 120 may be a circuit breaker or a contactor. The drive control module 111 refers to a module with functions of drive control and the like, and the drive control module 111 can be used for driving and controlling on-off of the operation switch, for example, the drive control module 111 can control the operation switch 120, and can drive and control the input and output of the switching value of the operation switch 120. The acquisition module 113 refers to a module with an electric parameter acquisition function, and the acquisition module 113 can be used for acquiring electric energy parameters of an incoming line end of the photovoltaic power generation system, for example, the acquisition module 113 can comprise a current sensor and a voltage sensor. The processor 115 refers to a device having functions of signal processing and signal transmission, and for example, the processor 115 may be ARM (Advanced RISC Machine) processors. The terminal may be a remote control platform, for example the terminal may be a cell phone, a computer or a tablet.
Specifically, based on the operation switch 120 being connected between the photovoltaic power generation system incoming line and the disturbance load, the driving control module 111 is connected to the operation switch 120, the collection module 113 is connected to the photovoltaic power generation system incoming line, and the processor 115 is respectively connected to the driving control module 111, the collection module 113 and the terminal. The acquisition module 113 can acquire the electric energy parameter information of the incoming line of the photovoltaic power generation system in real time and transmit the acquired computer parameter information to the processor 115, and the processor 115 can process the received electric energy parameter information to obtain a processing result. When the processing result meets the anti-island adjustment condition, the processor 115 generates an anti-island request signal and transmits the anti-island request signal to the terminal, so that an maintainer can know that island operation is generated in the photovoltaic power generation system through the observation terminal, and the maintainer can operate the terminal to enable the terminal to generate an anti-island execution signal and transmit the anti-island execution signal to the processor. When the processor 115 receives the anti-islanding execution signal, a control instruction can be generated and transmitted to the driving control module 111, so that the driving control module 111 drives the corresponding operation switch 120 to be turned on, and the anti-islanding operation is realized.
It should be noted that, in the photovoltaic power generation system, three paths of photovoltaic power generation system incoming lines can be generally included, the corresponding photovoltaic low-voltage safety control and intelligent regulation integrated equipment can include three operation switches, each operation switch is connected with each path of photovoltaic power generation system incoming line in a one-to-one correspondence manner, and the processor is connected with each operation switch respectively.
In the photovoltaic low-voltage safety control and intelligent regulation integrated equipment, when the photovoltaic power generation system performs island operation, the corresponding operation switch is turned on, disturbance load is put into the photovoltaic power generation system to perform anti-island treatment, the non-planned island operation is destroyed, the cost of the anti-island treatment is reduced, and the reliability of the system operation is improved.
It should be noted that the above-mentioned photovoltaic low-voltage safety control and intelligent regulation integrated equipment can be assembled on the grid-connected side of the distributed photovoltaic power generation system, and can be used for adjusting the unplanned island generated in the system when an maintainer inspects the photovoltaic power generation system. Wherein the distributed photovoltaic power generation system may be a photovoltaic power generation system of each capacity class of not more than 400 kW. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment can be connected into a distribution transformer low-voltage bus and a 380V distribution branch box.
In one embodiment, as shown in fig. 2, a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation is provided, which comprises a measurement and control device 210 and an operation switch 220 used for being connected between a photovoltaic power generation system incoming line and a disturbance load, wherein the measurement and control device 210 comprises a driving control module 211 connected with the operation switch 220, a collection module 213 connected with the photovoltaic power generation system incoming line, and a processor 215 respectively connected with the driving control module 211 and the collection module 213. And a phase change switch 230 for connecting between the incoming line of the photovoltaic power generation system and the photovoltaic grid-connected switch in the photovoltaic grid-connected box, wherein the phase change switch 230 is connected with the processor 215.
When the processing result satisfies the three-phase imbalance adjustment condition, the processor 215 switches the corresponding phase change switch 230 so that the three-phase imbalance is reduced. The anti-islanding request signal is further used for indicating the terminal to generate a second anti-islanding execution signal and transmitting the second anti-islanding execution signal to the processor 215, and the processor 215 is further used for switching the corresponding phase change switch 230 according to the second anti-islanding execution signal so as to increase the three-phase imbalance.
The phase change switch 230 can be used for switching an electric load to change phase, and is connected between a three-phase incoming line of a low-voltage distribution area and a photovoltaic grid-connected switch based on the phase change switch, a processor is connected with the phase change switch, and when the phase change switch receives a switching instruction of the processor, a corresponding phase line can be switched, so that power transfer between the phase lines is realized.
Specifically, based on the processor 215 being connected to the phase change switch 230, when the processing result meets the three-phase imbalance adjustment condition, the processor 215 can switch the corresponding phase change switch 230 to perform power transfer between the phase lines, reduce the imbalance between the phase lines, and realize three-phase imbalance adjustment. When the processing result meets the anti-island adjustment condition, the processor 215 generates an anti-island request signal and transmits the anti-island request signal to the terminal, so that an maintainer can know that island operation is generated in the photovoltaic power generation system through the observation terminal, the maintainer can operate the terminal to enable the terminal to generate a second anti-island execution signal and transmit the second anti-island execution signal to the processor 215, when the processor 215 receives the second anti-island execution signal, the processor 215 switches the corresponding phase change switch 230, performs power transfer between phase lines, increases unbalance degree between the phase lines, changes a power balance state through load power disturbance, and eliminates islands.
In the photovoltaic low-voltage safety control and intelligent regulation integrated equipment, when the photovoltaic power generation system normally operates, three-phase imbalance treatment can be performed in real time. When the photovoltaic power generation system is overhauled, field operation of overhauling staff is not needed, a phase change switch is controlled through a terminal, the operation of an unscheduled island is destroyed, the safety of the overhauling staff is protected, the workload of the overhauling staff is reduced, and the reliability of three-phase unbalanced adjustment and island elimination in a photovoltaic low-voltage distribution transformer area is improved.
In one embodiment, the three-phase imbalance adjustment condition is that the three-phase imbalance of the corresponding electric energy parameter information is greater than a first preset threshold value, and the three-phase imbalance adjustment condition is also used for switching the corresponding phase change switch when the processing result is that the three-phase imbalance of the corresponding electric energy parameter information is greater than the first preset threshold value;
And when the processing result is that the value of the electric energy parameter information is larger than the second preset threshold value, generating an anti-island request signal by the processor.
The electric energy parameter information can be electric parameters such as voltage, current, frequency and harmonic wave, and the electric energy parameter information can also be any combination of the electric parameters such as voltage, current, frequency and harmonic wave.
The processor compares the three-phase unbalance with a first preset threshold value, and when the three-phase unbalance is larger than the first preset threshold value, a switching instruction can be transmitted to a corresponding phase change switch, so that the power consumption load is switched to a corresponding phase line through the switching action of the phase change switch, and the unbalance between the phase lines is reduced through power transfer between the phase lines, thereby realizing three-phase unbalance adjustment.
Further, the processor may further process the received electrical energy parameter information to obtain a corresponding value of the electrical energy parameter information, for example, obtain a value of the voltage parameter and compare with a second preset threshold, where the processor may generate an anti-islanding request signal when the value of the electrical energy parameter information is greater than the second preset threshold, and transmit the anti-islanding request signal to the terminal, so as to implement indirect control of the operation switch through the terminal, close the corresponding operation switch, input a disturbance load, and further break an islanding generated in the system, and implement anti-islanding adjustment.
In the photovoltaic low-voltage safety control and intelligent regulation integrated equipment, when the photovoltaic power generation system normally operates, three-phase imbalance treatment can be performed in real time. When the photovoltaic power generation system is overhauled, an overhauling staff is not required to operate on site, an operation switch is controlled through a terminal, the operation of an unscheduled island is destroyed, the safety of the overhauling staff is protected, the workload of the overhauling staff is reduced, and the reliability of three-phase unbalanced adjustment and island elimination in a photovoltaic low-voltage distribution transformer area is improved.
In one embodiment, as shown in fig. 3, there is provided a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation, which comprises a measurement and control device 310 and an operation switch 320 connected between a photovoltaic power generation system incoming line and a disturbance load, wherein the measurement and control device 310 comprises a driving control module 311 connected with the operation switch 320, a collection module 313 connected with the photovoltaic power generation system incoming line, and a processor 315 respectively connected with the driving control module 311 and the collection module 313, and the measurement and control device further comprises:
The first communication module 317 is used for respectively connecting the terminal and the processor 315;
The second communication module 319, the second communication module 319 is configured to connect the phase change switch and the processor 315, respectively.
Wherein the first communication module 317 may be a wireless communication module and the second communication module 319 may be a wireless communication module. It should be noted that the first communication module 317 may include a first wireless communication antenna used in conjunction therewith, and the second communication module 319 may include a second wireless communication antenna used in conjunction therewith.
Specifically, based on the connection of the first communication module 317 between the terminal and the processor 315, the processor 315 may transmit the generated anti-islanding request signal to the terminal through the first communication module 317, so that an maintainer may monitor whether islanding operation is generated in the photovoltaic power generation system. The terminal may transmit the anti-islanding execution signal to the processor 315 through the first communication module 317, and then the processor 315 may control the corresponding operation switch 320 to be closed through the driving control module 311, so that the disturbance load corresponding to the connection operation switch 320 is put into the line, and the islanding generated in the line is destroyed. Based on the connection of the second communication module 319 between the phase change switch 330 and the processor 215, the processor 315 may generate a switching instruction when the three-phase imbalance adjustment condition is satisfied, and transmit the switching instruction to the corresponding phase change switch 330 through the second communication module 315, so that the power consumption load may be switched to the corresponding phase through the phase change switch, thereby implementing the three-phase imbalance adjustment.
In a specific embodiment, the first communication module is a wireless public network communication module or a power private network communication module, and the second communication module is a LoRa (Long Rang, a mature communication technology of LPWAN) communication module or a power line carrier communication module.
The wireless public network communication module may be a GPRS (GENERAL PACKET Radio Service) communication module, a 3G (3 rd-Generation, third Generation) communication module, a 4G (4 th-Generation, third Generation) communication module, or a 5G (5 th-Generation, third Generation) communication module, and the power private network communication module may be an LTE230 power private network communication module, where the LTE230 power private network communication module refers to an LTE power wireless communication module in a 230MHz (megahertz) frequency band.
In the photovoltaic low-voltage safety control and intelligent regulation integrated equipment, the electric energy parameter information can be acquired through the acquisition module, the processor is used for processing the electric energy parameter information, the three-phase imbalance condition is obtained according to the processing result, the switching instruction is transmitted to the corresponding phase change switch through the second communication module, the phase change operation is carried out through the phase change switch, and the three-phase imbalance treatment is realized. When island operation occurs, the terminal can be informed through the first communication module, and further the terminal can transmit an anti-island execution signal to the processor through the first communication module, so that the processor controls corresponding operation switches to be closed through the driving control module, disturbance loads are input, and island operation is destroyed. When the photovoltaic power generation system runs in an island, the corresponding operation switch is conducted, disturbance load is put into anti-island treatment to realize the switching of the disturbance load in remote control, the phase change switch is switched to perform phase change, power transfer is performed between phase lines, unbalance degree among the phase lines is increased, the power balance state is changed through load power disturbance, island is eliminated, further the workload of maintenance personnel is saved, and the reliability of the photovoltaic power generation system is improved.
In one embodiment, as shown in fig. 3, the second communication module 319 is also used to connect to a photovoltaic grid-tie switch.
The anti-islanding request signal is further used for indicating the terminal to generate a third anti-islanding execution signal and transmitting the third anti-islanding execution signal to the processor 315 through the first communication module 317, the processor 315 is further used for transmitting a driving signal generated according to the third anti-islanding execution signal to the second communication module 319, the second communication module 319 receives the driving signal transmitted by the processor 315 and transmits the driving signal to the corresponding photovoltaic grid-connected switch, and the driving signal is used for indicating the disconnection of the photovoltaic grid-connected switch.
In particular, the photovoltaic grid-tie box may comprise a photovoltaic grid-tie switch. The second communication module 319 is connected between the photovoltaic grid-connected switch and the processor 315, when the processing result meets the anti-islanding adjustment condition, the processor generates an anti-islanding request signal and transmits the anti-islanding request signal to the terminal, so that an maintainer can know that islanding operation is generated in the photovoltaic power generation system through the observation terminal, and can operate the terminal to enable the terminal to generate a third islanding execution signal and transmit the third islanding execution signal to the processor 315. When the processor 115 receives the third islanding execution signal, a driving signal can be generated, and the driving signal is transmitted to the photovoltaic grid-connected switch through the second communication module 319, so that the corresponding photovoltaic grid-connected switch is driven to be disconnected, and further, the power balance state in the system is changed, and the islanding is eliminated.
Further, the processor 315 may transmit the anti-island request signal to the terminal through the first communication module 317, and further the terminal may transmit the anti-island execution signal to the processor 315 through the first communication module 317, and the processor 315 may generate a driving signal for driving the photovoltaic grid-connected switch according to the anti-island execution signal, and transmit the driving signal to the photovoltaic grid-connected switch through the second communication module 319, and further may disconnect the corresponding photovoltaic grid-connected switch, thereby damaging the operation of the unplanned island. For example, through remote control of a terminal, a plurality of distributed photovoltaic lines with larger power can be selected to be cut off, and through signal transmission of the first communication module 317 and the second communication module 319, the corresponding photovoltaic grid-connected switch is disconnected, so that the power balance state is changed, islanding is eliminated, and the running reliability of the system is improved.
In one embodiment, the second communication module is further configured to connect to a meter of the photovoltaic grid-tie box.
The electric energy meter can be an intelligent electric meter and can be used for metering electric energy data of the distributed photovoltaic circuit. The photovoltaic grid-connected box can comprise an electric energy meter connected with distributed photovoltaic lines, for example, the photovoltaic power generation system comprises three distributed photovoltaic lines, and each distributed photovoltaic line is correspondingly connected with one photovoltaic grid-connected box.
Specifically, based on the connection of the second communication module between the electric energy meter and the processor, the processor can acquire electric energy data of the electric energy meter through the second communication module, photovoltaic power generation data of the distributed photovoltaic circuit can be acquired, and then the processor can transmit the acquired electric energy data to the terminal through the first communication module, so that real-time monitoring of photovoltaic power generation is realized through the terminal.
In one embodiment, the comprehensive equipment for photovoltaic low-voltage safety control and intelligent regulation comprises a measurement and control device, an operation switch and an electric locking module, wherein the operation switch is used for being connected between an incoming line of a photovoltaic power generation system and a disturbance load, and the electric locking module is used for being connected between the operation switch and a grid-connected incoming line switch of the incoming line of the photovoltaic power generation system. The measurement and control device comprises a driving control module connected with the operation switch, an acquisition module connected with the incoming line of the photovoltaic power generation system, and a processor respectively connected with the driving control module and the acquisition module.
The electric locking module can be used for realizing electric locking between the operation switch and a grid-connected inlet switch of the inlet wire of the photovoltaic power generation system.
Specifically, the electric locking module is connected between the operation switch and the grid-connected inlet switch of the photovoltaic power generation system inlet wire, so that the operation switch and the grid-connected inlet switch are interlocked, misoperation of the operation switch can be prevented, disturbance load misoperation is caused, and the safety performance of the system is improved.
In one embodiment, as shown in fig. 4, a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation is provided, which comprises a measurement and control device 410, an operation switch 420 connected between an incoming line of a photovoltaic power generation system and a disturbance load, and a delay protection device 440 connected with the operation switch 420. The measurement and control device 410 comprises a driving control module 411 connected with an operation switch 420, an acquisition module 413 connected with the incoming line of the photovoltaic power generation system, and a processor 415 respectively connected with the driving control module 411 and the acquisition module 413.
The delay protection device 440 may be used to delay the operation of the switch.
Specifically, by applying delay protection to the operation switch 420 based on the connection of the delay protection device 440 to the operation switch 420, the delay protection device 440 is activated to start delay preset time counting when the disturbance load is input. When the time of the disturbance load input is greater than or equal to the delay preset time, the operation switch 420 is turned off, so that the disturbance load can be prevented from being heated and burnt due to long-time access, and the reliability of the system is improved.
Furthermore, the operation switch is a breaker, and the delay protection organization is connected with a breaking coil of the breaker, so that when the time of disturbance load input reaches the delay preset time, the operation switch is automatically disconnected, and the disturbance load is prevented from heating and burning.
In a specific embodiment, the delay protection device comprises an intermediate relay and a time relay which are respectively connected with the operation switch, wherein the intermediate relay is connected with the time relay.
The time relay can be used for carrying out time delay timing on the operation switch, and the intermediate relay can be used for switching off the operation switch when the time delay timing arrives.
Specifically, the operation switch is respectively connected with the intermediate relay and the time relay, and the intermediate relay is connected with the time relay. When the operation switch is closed, the time relay is triggered to start, the time relay starts to count, when the delay preset time is reached, the intermediate relay is triggered to start, and the operation switch is driven to be disconnected through the intermediate relay. The intermediate relay and the time relay form a delay protection device of the operation switch, so that overheat protection of the input disturbance load is realized.
In one embodiment, as shown in fig. 5, a comprehensive device for photovoltaic low-voltage safety control and intelligent regulation is provided, which comprises a measurement and control device and an operation switch used for being connected between an incoming line and a disturbance load of a photovoltaic power generation system. The measurement and control device comprises a driving control module connected with the opening and closing coil of the operation switch, an acquisition module connected with the incoming line of the photovoltaic power generation system, and a processor respectively connected with the driving control module and the acquisition module.
Specifically, the utility-to-low voltage comprehensive distribution box can be connected to three paths of distributed photovoltaic power generation (namely, the utility-to-low voltage comprehensive distribution box can comprise a first photovoltaic power generation system incoming line, a second photovoltaic power generation system incoming line and a third photovoltaic power generation system incoming line), and the photovoltaic low voltage safety control and intelligent regulation comprehensive equipment can be assembled at an incoming line switch of the photovoltaic power generation system. When overhauling a distribution transformer or a line of the three-way incoming line, the possibility of island effect of distributed photovoltaic power generation on the line exists, and the anti-island adjustment can be carried out on the three-way incoming line to destroy all possible island operation under the line.
Furthermore, in a non-overhauling period, when the photovoltaic power generation system normally operates, the acquisition module can acquire electric energy parameter information such as voltage, current, frequency and harmonic waves of the incoming line of the photovoltaic power generation system, the electric energy parameter information is received and processed through the processor, three-phase unbalance is obtained, and according to the obtained three-phase unbalance, the electricity load needing to be commutated can be further determined. The processor informs the corresponding phase change switch through the second communication module to switch the power consumption load, so as to realize the treatment of three-phase unbalance. In an example, the second communication module can be further used for connecting an electric energy meter of the photovoltaic grid-connected box, collecting photovoltaic power generation data of each path of distributed photovoltaic, and reporting the photovoltaic power generation data to the terminal to realize real-time monitoring of photovoltaic power generation.
In the maintenance period, the photovoltaic grid-connected inlet wire switch is disconnected, if no live island operation occurs, maintenance staff can maintain normally, and if live island occurs, the maintenance staff can destroy the island in four modes, wherein the first mode is that the terminal is communicated with the processor through the first communication module, the processor is communicated with the photovoltaic grid-connected switch through the second communication module, and further, a plurality of paths of distributed photovoltaic with larger power can be cut off selectively, so that the corresponding photovoltaic grid-connected switch is disconnected, the power balance state is changed, and the island is eliminated. The second is that the terminal communicates with the processor through the first communication module, and the processor selectively closes the corresponding operation switch, so as to put disturbance load into the circuit and destroy all possible islands under the circuit. And the third is that the terminal is communicated with the processor through the first communication module, the corresponding phase change switch is selectively closed through the processor, power transfer is carried out between phase lines, unbalance degree between the phase lines is increased, the power balance state is changed through load power disturbance, and island is eliminated. And fourthly, when the network is limited and the communication modules (the first communication module and the second communication module) cannot be used, an maintainer can manually operate on site, put disturbance load and destroy an island. In one example, after the operation switch perturbs the load, if the input time exceeds a preset delay time (for example, the delay time is set to 1 second), the operation switch is triggered to be turned off, so as to prevent the perturbed load from being burnt out due to overheating.
In the comprehensive equipment for photovoltaic low-voltage safety control and intelligent regulation, when the three-phase unbalance occurs in the operation of the photovoltaic power generation system, the three-phase unbalance adjustment can be performed in real time, and when the island operation occurs in the photovoltaic power generation system, the anti-island treatment is performed in time, so that the non-planned island operation is destroyed, the cost of the anti-island treatment is reduced, and the reliability of the system operation is improved.
In one embodiment, the photovoltaic low-voltage safety control and intelligent regulation integrated device further comprises a power supply module used for being connected with the measurement and control device. The power supply module comprises a power supply converter and a power supply battery connected with the power supply converter, wherein the power supply converter can be an isolated AC/DC converter, and the power supply battery can be a lead-acid storage battery. The power supply module is connected with the measurement and control device, so that a working power supply can be provided for the measurement and control device, and the measurement and control device can work continuously.
In one embodiment, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, and the integrated device further comprises a cabinet body for installing a measurement and control device, a disturbance load and an operation switch. The cabinet body is an upper rod type cabinet body, a wall-mounted cabinet body or a floor type cabinet body.
The upper rod type cabinet body refers to a cabinet body capable of being hung on an electric pole, the wall-mounted cabinet body refers to a cabinet body capable of being hung on a wall, and the floor type cabinet body refers to a cabinet body capable of standing on the ground.
Specifically, as shown in fig. 6, the upper rod type cabinet body is a schematic structural diagram, hanging holes are respectively formed at the upper end and the lower end of the upper rod type cabinet body, and the cabinet body can be hung on an electric pole through anchor ears and expansion screws. As shown in fig. 7, which is a schematic structural diagram of a wall-mounted cabinet, the left and right sides of the wall-mounted cabinet are respectively provided with a preset number of hanging holes (for example, 6 hanging holes), so that the cabinet can be hung on a wall. As shown in fig. 8, the floor-type cabinet is schematically shown in structure, and a bracket is provided at the bottom of the floor-type cabinet to enable the cabinet to stand on the ground.
In a specific embodiment, as shown in fig. 9, a schematic diagram of the internal configuration of the cabinet of the integrated photovoltaic low-voltage safety control and intelligent regulation device is shown. Wherein, the inside of the cabinet body can be assembled with a measurement and control device 910, a first communication module and a second communication module which are matched with the measurement and control device 910, a time relay 970, an isolated AC/DC converter 980, two lead-acid storage batteries 990, three operation switches 940, three disturbance loads 950 and three intermediate relays 960. The first communication module includes a first communication antenna 920 and the second communication module includes a second communication antenna 930.
Specifically, a measurement module and an operation switch 940 of the measurement and control device 910 are respectively connected to a distributed photovoltaic power generation system through incoming cables, a first communication module and a second communication module are respectively connected to a processor of the measurement and control device 910, each operation switch 940 is respectively connected with each disturbance load 950 in a one-to-one correspondence manner through cables, a time relay 970 and each intermediate relay 960 are connected with a switching-off coil of the operation switch 940 through a connection terminal 962 to form a delay protection device of the operation switch 940, a driving control module of the measurement and control device 910 is connected to the switching-on and switching-off coils of the operation switch 940 to realize the switching-on and switching-off functions of the remote control operation switch, and an isolated AC/DC converter 980 is connected with a lead-acid battery 990 to provide a working power supply for the measurement and control device to ensure that the intelligent measurement and control device can continuously work.
Further, the working process of the photovoltaic low-voltage safety control and intelligent regulation integrated equipment comprises the steps of collecting the electric energy parameter information of an incoming line through an acquisition module of the measurement and control device when the photovoltaic power generation system works normally, processing the electric energy parameter information through a processor of the measurement and control device to obtain three-phase unbalance degree, and informing a corresponding phase change switch to switch an electric load according to a processing result to realize three-phase unbalance treatment. Meanwhile, the power generation data of each path of distributed photovoltaic can be collected through the second communication module and transmitted to the terminal through the first communication module, so that photovoltaic power generation monitoring is realized. When maintenance personnel repair the photovoltaic power generation system, if the distributed photovoltaic power generation system generates the non-planned island operation, a plurality of paths of distributed photovoltaic can be cut off through remote control of a terminal, an operation switch is closed through remote control or a phase change switch is switched through remote control, so that the power balance state is changed, the non-planned island operation is damaged, the cost of anti-island processing is reduced, and the reliability of the system operation is improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The comprehensive equipment for photovoltaic low-voltage safety control and intelligent regulation is characterized by comprising a measurement and control device and an operation switch, wherein the operation switch is used for being connected between an incoming line and a disturbance load of a photovoltaic power generation system, and the measurement and control device comprises:
the driving control module is used for driving the on-off of the operation switch;
The acquisition module is used for acquiring electric energy parameter information of the incoming line of the photovoltaic power generation system;
The processor is respectively connected with the driving control module and the acquisition module; the processor is used for connecting a terminal, receiving and processing the electric energy parameter information to obtain a processing result, generating an anti-islanding request signal when the processing result meets an anti-islanding adjustment condition, and transmitting the anti-islanding request signal to the terminal, wherein the anti-islanding request signal is used for indicating the terminal to generate an anti-islanding execution signal and transmitting the anti-islanding execution signal to the processor;
The photovoltaic low-voltage safety control and intelligent regulation integrated equipment further comprises a phase change switch which is connected between the incoming line of the photovoltaic power generation system and a photovoltaic grid-connected switch in the photovoltaic grid-connected box;
When the processing result meets the three-phase unbalance adjustment condition, the processor switches the corresponding phase change switch so as to reduce the three-phase unbalance;
The anti-island request signal is further used for indicating the terminal to generate a second anti-island execution signal and transmitting the second anti-island execution signal to the processor, and the processor is further used for switching the corresponding phase change switch according to the second anti-island execution signal so as to increase the three-phase unbalance.
2. The comprehensive photovoltaic low-voltage safety control and intelligent regulation device according to claim 1, wherein the three-phase imbalance adjustment condition is that the three-phase imbalance corresponding to the electric energy parameter information is greater than a first preset threshold value;
The processor is further configured to generate the anti-islanding request signal when the processing result is that the value of the electrical energy parameter information is greater than a second preset threshold value.
3. The integrated photovoltaic low-voltage safety control and intelligent regulation device according to claim 1, wherein the measurement and control apparatus further comprises:
The first communication module is used for respectively connecting the terminal and the processor;
the second communication module is used for being connected with the phase change switch and the processor respectively.
4. The photovoltaic low-voltage safety control and intelligent regulation integrated device according to claim 3, wherein the first communication module is a wireless public network communication module or a power private network communication module;
the second communication module is a LoRa communication module or a power line carrier communication module.
5. The integrated photovoltaic low-voltage safety control and intelligent regulation device of claim 3, wherein the second communication module is further configured to connect to the photovoltaic grid-connected switch;
the anti-islanding request signal is also used for indicating the terminal to generate a third anti-islanding execution signal and transmitting the third anti-islanding execution signal to the processor through the first communication module;
the second communication module receives the driving signal transmitted by the processor and transmits the driving signal to the corresponding photovoltaic grid-connected switch, and the driving signal is used for indicating the disconnection of the photovoltaic grid-connected switch.
6. The integrated photovoltaic low-voltage safety control and intelligent regulation device according to claim 3, wherein the second communication module is further used for connecting an ammeter of a photovoltaic grid-connected box.
7. The integrated photovoltaic low-voltage safety control and intelligent regulation device according to claim 1, further comprising an electrical blocking module for connecting between the operating switch and a grid-connected inlet switch of the photovoltaic power generation system inlet, and a delay protection device for connecting the operating switch.
8. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 7, wherein the delay protection device comprises an intermediate relay and a time relay which are respectively connected with the operation switch, and the intermediate relay is connected with the time relay.
9. The integrated photovoltaic low-voltage safety control and intelligent regulation device according to any one of claims 1 to 8, further comprising a cabinet for housing the measurement and control means, the disturbance load and the operating switch;
the cabinet body is an upper rod type cabinet body, a wall-mounted cabinet body or a floor type cabinet body.
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| CN110957748A (en) * | 2019-12-17 | 2020-04-03 | 中国农业大学 | A three-phase voltage unbalance adjusting device and method |
| CN111555352A (en) * | 2020-05-25 | 2020-08-18 | 广西电网有限责任公司玉林供电局 | Photovoltaic low-voltage protection equipment, control method, control device and storage medium |
| CN113964859A (en) * | 2021-09-06 | 2022-01-21 | 国网浙江省电力有限公司台州供电公司 | Device for realizing anti-islanding |
| CN116231870B (en) * | 2023-03-31 | 2024-08-09 | 国网江苏省电力有限公司扬州供电分公司 | A method for mapping information of low-voltage distributed photovoltaic user inverters |
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