Photovoltaic low voltage safety control and intelligent regulation comprehensive equipment

Abstract

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

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic low-voltage safety control and intelligent regulation integrated device. Background Art

[0002] At present, most distributed photovoltaic power generation systems are distributed in low-voltage distribution stations, and use a three-phase four-wire system to supply power to user equipment. It is a power supply network that uses a mixture of three-phase production power and single-phase loads. Due to the uncontrollable capacity increase of single-phase users, the access of high-power single-phase loads, and the asynchronicity of single-phase load power consumption, the three-phase load will be unbalanced, thus affecting the safe and stable operation of the system. At the same time, most distributed photovoltaic power generation belongs to the user-side grid connection, and the output and load are balanced nearby. There is an island effect problem, that is, when the switch connected to the power grid is disconnected, the photovoltaic power generation system continues to supply power to the de-pressurized power grid because the output and load are close to balance. When power maintenance personnel are maintaining the photovoltaic power generation system, they may be injured because the line is energized.

[0003] During the implementation process, the inventors found that there are at least the following problems in the traditional technology: the traditional anti-islanding device used to actively eliminate islands has a single function and requires maintenance personnel to operate it manually on site, which has high manpower and material costs and low reliability. Summary of the invention

[0004] Based on this, it is necessary to provide a comprehensive photovoltaic low-voltage safety control and intelligent regulation device to address the low reliability problem of island elimination in traditional photovoltaic low-voltage distribution stations.

[0005] In order to achieve the above-mentioned object, an embodiment of the present invention provides a photovoltaic low-voltage safety control and intelligent regulation integrated device, including a measurement and control device, and an operating switch for connecting between the incoming line of the photovoltaic power generation system and the disturbance load; the measurement and control device includes:

[0006] A drive control module connected to the operating switch; the drive control module is used to drive the operating switch on and off;

[0007] A collection module connected to the incoming line of the photovoltaic power generation system; the collection module is used to collect electric energy parameter information of the incoming line of the photovoltaic power generation system;

[0008] The processors are respectively connected to the drive control module and the acquisition module; the processor is used to connect to the terminal; the processor receives and processes the electric energy parameter information to obtain the processing result; and when the processing result meets the anti-islanding adjustment condition, the anti-islanding request signal is generated, and the anti-islanding request signal is transmitted to the terminal; the anti-islanding request signal is used to instruct the terminal to generate an anti-islanding execution signal, and transmit the anti-islanding execution signal to the processor; the processor is also used to turn on the corresponding operation switch according to the anti-islanding execution signal.

[0009] In one embodiment, it also includes a phase-changing switch for connecting between the incoming line of the photovoltaic power generation system and the photovoltaic grid-connected switch in the photovoltaic grid-connected box; the phase-changing switch is connected to the processor;

[0010] When the processing result meets the three-phase unbalance adjustment condition, the processor switches the corresponding phase-changing switch to reduce the three-phase unbalance;

[0011] The anti-islanding request signal is also used to instruct the terminal to generate a second anti-islanding execution signal and transmit the second anti-islanding execution signal to the processor; the processor is also used to switch the corresponding phase-changing switch according to the second anti-islanding execution signal to increase the three-phase imbalance.

[0012] In one embodiment, the three-phase unbalance adjustment condition is that the three-phase unbalance degree of the corresponding electric energy parameter information is greater than a first preset threshold value; the processor is further configured to switch the corresponding phase-changing switch when the processing result is that the three-phase unbalance degree of the corresponding electric energy parameter information is greater than the first preset threshold value;

[0013] The anti-islanding adjustment condition is that the value of the electric energy parameter information is greater than the second preset threshold; the processor is also used to generate an anti-islanding request signal when the processing result is that the value of the electric energy parameter information is greater than the second preset threshold.

[0014] In one embodiment, the measurement and control device further includes:

[0015] A first communication module; the first communication module is used to connect the terminal and the processor respectively;

[0016] The second communication module is used to connect the phase-changing switch and the processor respectively.

[0017] In one embodiment, the first communication module is a wireless public network communication module or a power private network communication module;

[0018] The second communication module is a LoRa communication module or a power line carrier communication module.

[0019] In one of the embodiments, the second communication module is also used to connect to a photovoltaic grid-connected switch;

[0020] The anti-islanding request signal is also used to instruct the terminal to generate a third anti-islanding execution signal, and transmit the third anti-islanding execution signal to the processor through the first communication module; the processor is also used to transmit the driving signal generated according to the third anti-islanding execution signal to the second communication module;

[0021] The second communication module receives the driving signal transmitted by the processor, and transmits the driving signal to the corresponding photovoltaic grid-connected switch; the driving signal is used to instruct the photovoltaic grid-connected switch to disconnect.

[0022] In one of the embodiments, the second communication module is also used to connect to an electric energy meter of the photovoltaic grid-connected box.

[0023] In one embodiment, it also includes an electrical locking module for connecting between the operating switch and the grid-connected incoming line switch of the photovoltaic power generation system, and a time delay protection device for connecting the operating switch.

[0024] In one of the embodiments, the time delay protection device includes an intermediate relay and a time relay respectively connected to the operating switch; the intermediate relay is connected to the time relay.

[0025] In one of the embodiments, it also includes a cabinet for installing the measurement and control device, the disturbance load and the operating switch;

[0026] The cabinet body is a top-mounted cabinet body, a wall-mounted cabinet body or a floor-standing cabinet body.

[0027] One of the above technical solutions has the following advantages and beneficial effects:

[0028] Based on the operation switch connected between the incoming line of the photovoltaic power generation system and the disturbance load, the drive control module is connected to the operation switch, the acquisition module is connected to the incoming line of the photovoltaic power generation system, and the processor is connected to the drive control module, the acquisition module and the terminal respectively. The processor can receive and process the electric energy parameter information to obtain the processing result; and when the processing result meets the anti-islanding adjustment condition, it generates an anti-islanding request signal, and transmits the anti-islanding request signal to the terminal, so that the terminal generates an anti-islanding execution signal according to the anti-islanding request signal, and transmits the anti-islanding execution signal to the processor; and then the processor can turn on the corresponding operation switch according to the anti-islanding execution signal. When the photovoltaic power generation system is in islanding operation, by turning on the corresponding operation switch, the disturbance load is put into anti-islanding processing, the unplanned islanding operation is destroyed, the cost of anti-islanding processing is reduced, and the reliability of system operation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A first structural schematic diagram of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment;

[0030] Figure 2 A second structural schematic diagram of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment;

[0031] Figure 3 A third structural schematic diagram of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment;

[0032] Figure 4 A fourth structural schematic diagram of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment;

[0033] Figure 5 A fifth structural schematic diagram of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment;

[0034] Figure 6 It is a structural schematic diagram of an upper rod type cabinet in one embodiment;

[0035] Figure 7 It is a structural schematic diagram of a wall-mounted cabinet in one embodiment;

[0036] Figure 8 This is a schematic structural diagram of a floor-standing cabinet in one embodiment;

[0037] Fig. 9 Schematic diagram of the internal configuration of a cabinet of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment. DETAILED DESCRIPTION

[0038] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] In order to solve the problem of low reliability of island elimination in traditional photovoltaic low-voltage distribution stations, the embodiment of the present application provides a photovoltaic low-voltage safety control and intelligent regulation integrated device. Figure 1 FIG. 1 is a schematic diagram of the first structure of a photovoltaic low-voltage safety control and intelligent regulation integrated device in one embodiment. Figure 1 As shown, it includes a measurement and control device 110 and an operating switch 120 for connecting between the incoming line of the photovoltaic power generation system and the disturbance load; the measurement and control device 110 includes:

[0041] A drive control module 111 connected to the operating switch 120; the drive control module 111 is used to drive the operating switch on and off;

[0042] A collection module 113 connected to the incoming line of the photovoltaic power generation system; the collection module 113 is used to collect electric energy parameter information of the incoming line of the photovoltaic power generation system;

[0043] The processor 115 is respectively connected to the drive control module 111 and the acquisition module 113; the processor 115 is used to connect to the terminal; the processor 115 receives and processes the electric energy parameter information to obtain the 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 anti-islanding request signal is used to instruct the terminal to generate an anti-islanding execution signal, and transmit the anti-islanding execution signal to the processor 115; the processor 115 is also used to turn on the corresponding operation switch 120 according to the anti-islanding execution signal.

[0044] Among them, the measurement and control device 110 refers to a device with functions such as signal measurement, signal processing and control. The incoming line of the photovoltaic power generation system refers to the incoming line end of the photovoltaic power generation system. The disturbance load can be a resistor device; after the disturbance load is put into the incoming line end of the photovoltaic power generation system, it can cause the undervoltage protection of the photovoltaic power generation system. The operating switch 120 refers to a switch element with a large current breaking capacity; for example, the operating switch 120 can be a circuit breaker or a contactor. The drive control module 111 refers to a module with functions such as drive control; the drive control module 111 can be used to drive and control the on and off of the operating switch, for example, the drive control module 111 can control the operating switch 120, and can drive and control the switch input and output of the operating switch 120. The acquisition module 113 refers to a module with an electrical parameter acquisition function; the acquisition module 113 can be used to collect the electrical energy parameters of the incoming line end of the photovoltaic power generation system, for example, the acquisition module 113 may include a current sensor and a voltage sensor. The processor 115 refers to a device with functions such as signal processing and signal transmission; for example, the processor 115 can be an ARM (Advanced RISC Machine) processor. The terminal may be a remote control platform, for example, the terminal may be a mobile phone, a computer or a tablet computer.

[0045] Specifically, based on the operation switch 120 being connected between the incoming line of the photovoltaic power generation system and the disturbance load, the drive control module 111 is connected to the operation switch 120, the acquisition module 113 is connected to the incoming line of the photovoltaic power generation system, and the processor 115 is respectively connected to the drive control module 111, the acquisition module 113 and the terminal. The acquisition module 113 can collect the electric energy parameter information of the incoming line of the photovoltaic power generation system in real time, and transmit the collected electric energy parameter information to the processor 115; the processor 115 can process the received electric energy parameter information to obtain a processing result. When the processing result meets the anti-islanding adjustment condition, the processor 115 generates an anti-islanding request signal and transmits the anti-islanding request signal to the terminal, and then the maintenance personnel can learn that an islanding operation has occurred in the photovoltaic power generation system by observing the terminal; the maintenance personnel can operate the terminal so that the terminal generates an anti-islanding execution signal and transmits the anti-islanding execution signal to the processor. When the processor 115 receives the anti-islanding execution signal, it can generate a control instruction and transmit the control instruction to the drive control module 111, so that the drive control module 111 drives the corresponding operation switch 120 to be turned on to achieve anti-islanding operation.

[0046] It should be noted that in a photovoltaic power generation system, three photovoltaic power generation system incoming lines may usually be included, and the corresponding above-mentioned photovoltaic low-voltage safety control and intelligent regulation integrated equipment may include three operating switches, each operating switch is connected to each photovoltaic power generation system incoming line one by one, and the processor is connected to each operating switch respectively.

[0047] In the above-mentioned photovoltaic low-voltage safety control and intelligent regulation integrated equipment, when the photovoltaic power generation system encounters island operation, the corresponding operating switch is turned on and the disturbance load is put into use for anti-islanding processing, thereby destroying the unplanned island operation, reducing the cost of anti-islanding processing and improving the reliability of system operation.

[0048] It should be noted that the above-mentioned photovoltaic low-voltage safety control and intelligent adjustment integrated equipment can be installed on the grid-connected side of the distributed photovoltaic power generation system, and can be used to adjust the unplanned islands generated in the system when maintenance personnel repair the photovoltaic power generation system. Among them, the distributed photovoltaic power generation system can be a photovoltaic power generation system of various capacity levels not exceeding 400kW. The above-mentioned photovoltaic low-voltage safety control and intelligent adjustment integrated equipment can be connected to the distribution transformer low-voltage busbar and the 380V distribution branch box.

[0049] In one embodiment, Figure 2As shown, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, including a measurement and control device 210, and an operation switch 220 for connecting between the incoming line of the photovoltaic power generation system and the disturbance load; the measurement and control device 210 includes a drive control module 211 connected to the operation switch 220, a collection module 213 connected to the incoming line of the photovoltaic power generation system, and a processor 215 connected to the drive control module 211 and the collection module 213 respectively. It also includes a phase-changing 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; the phase-changing switch 230 is connected to the processor 215.

[0050] When the processing result satisfies the three-phase unbalance adjustment condition, the processor 215 switches the corresponding phase-changing switch 230 to reduce the three-phase unbalance. The anti-islanding request signal is also used to instruct the terminal to generate a second anti-islanding execution signal and transmit the second anti-islanding execution signal to the processor 215; the processor 215 is also used to switch the corresponding phase-changing switch 230 according to the second anti-islanding execution signal to increase the three-phase unbalance.

[0051] Among them, the phase-changing switch 230 can be used to switch the electrical load for phase change; based on the phase-changing switch being connected between the three-phase incoming line and the photovoltaic grid-connected switch of the low-voltage distribution station area, the processor is connected to the phase-changing switch. When the phase-changing switch receives the switching instruction from the processor, it can switch the corresponding phase line to realize power transfer between the phase lines.

[0052] Specifically, based on the connection of the processor 215 to the phase-changing switch 230, when the processing result of the processor 215 meets the three-phase unbalance adjustment condition, the processor 215 can switch the corresponding phase-changing switch 230, transfer power between the phase lines, reduce the imbalance between the phase lines, and achieve three-phase unbalance adjustment. When the processing result of the processor 215 meets the anti-islanding adjustment condition, the processor 215 generates an anti-islanding request signal and transmits the anti-islanding request signal to the terminal, and then the maintenance personnel can learn that the photovoltaic power generation system has generated an islanding operation by observing the terminal; the maintenance personnel can operate the terminal so that the terminal generates a second anti-islanding execution signal and transmits the second anti-islanding execution signal to the processor 215; when the processor 215 receives the second anti-islanding execution signal, it switches the corresponding phase-changing switch 230, transfers power between the phase lines, increases the imbalance between the phase lines, changes the power balance state through load power disturbance, and eliminates the island.

[0053] In the above photovoltaic low-voltage safety control and intelligent regulation integrated equipment, three-phase imbalance control can be performed in real time when the photovoltaic power generation system is operating normally. When the photovoltaic power generation system is repaired, there is no need for maintenance personnel to operate on site. The terminal controls the phase-changing switch to destroy unplanned island operation, protect the safety of maintenance personnel and reduce their workload, thereby improving the reliability of three-phase imbalance adjustment and island elimination in the photovoltaic low-voltage distribution station area.

[0054] In one embodiment, the three-phase unbalance adjustment condition is that the three-phase unbalance degree of the corresponding electric energy parameter information is greater than a first preset threshold value; and is also used to switch the corresponding phase-changing switch when the processing result is that the three-phase unbalance degree of the corresponding electric energy parameter information is greater than the first preset threshold value;

[0055] The anti-islanding adjustment condition is that the value of the electric energy parameter information is greater than the second preset threshold; when the processing result is that the value of the electric energy parameter information is greater than the second preset threshold, the processor generates an anti-islanding request signal.

[0056] The electric energy parameter information may be electric parameters such as voltage, current, frequency and harmonics, and the electric energy parameter information may also be any combination of electric parameters such as voltage, current, frequency and harmonics.

[0057] Specifically, the processor can process the received electric energy parameter information to obtain the three-phase imbalance, and then confirm the electrical load that needs to be changed according to the obtained three-phase imbalance; the processor compares the three-phase imbalance with the first preset threshold, and when the three-phase imbalance is greater than the first preset threshold, the processor can transmit a switching instruction to the corresponding phase-changing switch, and then through the switching action of the phase-changing switch, the electrical load is switched to the corresponding phase line, and through the power transfer between the phase lines, the imbalance between the phase lines is reduced, thereby realizing three-phase imbalance adjustment.

[0058] Furthermore, the processor can also process the received electric energy parameter information to obtain the corresponding numerical value of the electric energy parameter information, such as obtaining the numerical value of the voltage parameter and comparing it with the second preset threshold value. When the numerical value of the electric energy parameter information is greater than the second preset threshold value, the processor can generate an anti-islanding request signal and transmit the anti-islanding request signal to the terminal, thereby indirectly controlling the operating switch through the terminal, closing the corresponding operating switch, and putting the disturbance load into operation, thereby destroying the island generated in the system and realizing anti-islanding adjustment.

[0059] In the above photovoltaic low-voltage safety control and intelligent regulation integrated equipment, three-phase imbalance control can be performed in real time when the photovoltaic power generation system is operating normally. When the photovoltaic power generation system is repaired, there is no need for maintenance personnel to operate on site. The terminal controls the operation switch to destroy the unplanned island operation, protect the safety of maintenance personnel and reduce their workload, thereby improving the reliability of three-phase imbalance adjustment and island elimination in the photovoltaic low-voltage distribution station area.

[0060] In one embodiment, Figure 3As shown, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, including a measurement and control device 310, and an operation switch 320 for connecting between the incoming line of the photovoltaic power generation system and the disturbance load; the measurement and control device 310 includes a drive control module 311 connected to the operation switch 320, a collection module 313 connected to the incoming line of the photovoltaic power generation system, and a processor 315 respectively connected to the drive control module 311 and the collection module 313; the measurement and control device also includes:

[0061] The first communication module 317 is used to connect the terminal and the processor 315 respectively;

[0062] The second communication module 319: The second communication module 319 is used to connect the phase-changing switch and the processor 315 respectively.

[0063] 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 for matching use, and the second communication module 319 may include a second wireless communication antenna for matching use.

[0064] Specifically, based on the first communication module 317 being connected between the terminal and the processor 315, the processor 315 can transmit the generated anti-islanding request signal to the terminal through the first communication module 317, and then the maintenance personnel can monitor whether the photovoltaic power generation system generates an islanding operation. The terminal can transmit the anti-islanding execution signal to the processor 315 through the first communication module 317, and then the processor 315 can control the corresponding operation switch 320 to close through the drive control module 311, so that the disturbance load corresponding to the operation switch 320 is put into the line to destroy the island generated in the line. Based on the second communication module 319 being connected between the phase-changing switch 330 and the processor 215, the processor 315 can generate a switching instruction when the three-phase unbalance adjustment condition is met, and transmit the switching instruction to the corresponding phase-changing switch 330 through the second communication module 315, and then the power load can be switched to the corresponding phase through the phase-changing switch to achieve three-phase unbalance adjustment.

[0065] In a specific 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 (Long Rang, a mature communication technology of LPWAN) communication module or a power line carrier communication module.

[0066] Among them, the wireless public network communication module can be a GPRS (General Packet Radio Service, general packet radio service technology) communication module, or it can be a 3G (3rd-Generation, third-generation mobile communication technology) communication module, a 4G (4th-Generation, third-generation mobile communication technology) communication module or a 5G (5th-Generation, third-generation mobile communication technology) communication module; the power private network communication module can be an LTE230 power private network communication module, and the LTE230 power private network communication module refers to an LTE power wireless communication module in the 230MHz (megahertz) frequency band.

[0067] In the above-mentioned photovoltaic low-voltage safety control and intelligent regulation integrated equipment, the electric energy parameter information can be collected through the collection module, and the processor can process the electric energy parameter information and obtain the three-phase imbalance status according to the processing result, and then the switching instruction is transmitted to the corresponding phase-changing switch through the second communication module, and the phase-changing operation is performed through the phase-changing switch to achieve three-phase imbalance control. When island operation occurs, the terminal can be notified through the first communication module, and then the terminal can transmit the anti-island execution signal to the processor through the first communication module, so that the processor controls the corresponding operation switch to close through the drive control module, puts in the disturbance load, and destroys the island operation. When three-phase imbalance occurs in the operation of the photovoltaic power generation system, the three-phase imbalance can be adjusted in real time by switching the corresponding phase-changing switch; when the photovoltaic power generation system is in island operation, the disturbance load is turned on by turning on the corresponding operation switch to carry out anti-islanding processing, so as to realize remote control of the switching of the disturbance load; the phase can also be switched by switching the phase-changing switch to transfer power between phase lines, increase the imbalance between phase lines, change the power balance state by load power disturbance, eliminate islanding, thereby saving the workload of maintenance personnel and improving the reliability of the photovoltaic power generation system.

[0068] In one embodiment, Figure 3 As shown, the second communication module 319 is also used to connect to the photovoltaic grid-connected switch.

[0069] The anti-islanding request signal is also used to instruct the terminal to generate a third anti-islanding execution signal, and transmit the third anti-islanding execution signal to the processor 315 through the first communication module 317; the processor 315 is also used to transmit the 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; the driving signal is used to instruct the photovoltaic grid-connected switch to disconnect.

[0070] Specifically, the photovoltaic grid-connected box may include a photovoltaic grid-connected switch. Based on the second communication module 319 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 the maintenance personnel can learn that an islanding operation has occurred in the photovoltaic power generation system by observing the terminal; the maintenance personnel can operate the terminal so that the terminal generates a third anti-islanding execution signal, and transmits the third anti-islanding execution signal to the processor 315. When the processor 115 receives the third anti-islanding execution signal, it can generate a driving signal, and transmit the driving signal to the photovoltaic grid-connected switch through the second communication module 319, thereby driving the corresponding photovoltaic grid-connected switch to disconnect, thereby changing the power balance state in the system and eliminating the island.

[0071] Furthermore, the processor 315 can transmit the anti-islanding request signal to the terminal through the first communication module 317, and then the terminal can transmit the anti-islanding execution signal to the processor 315 through the first communication module 317. The processor 315 can generate a driving signal for driving the photovoltaic grid-connected switch according to the anti-islanding execution signal, and transmit the driving signal to the photovoltaic grid-connected switch through the second communication module 319, and then disconnect the corresponding photovoltaic grid-connected switch to destroy the unplanned islanding operation. For example, through the remote control of the terminal, several high-power distributed photovoltaic lines can be selected to be cut off, and the corresponding photovoltaic grid-connected switches can be disconnected through the signal transmission of the first communication module 317 and the second communication module 319, thereby changing the power balance state, eliminating the island, and improving the reliability of system operation.

[0072] In one embodiment, the second communication module is also used to connect to an electric energy meter of the photovoltaic grid-connected box.

[0073] The energy meter may be a smart meter, which can be used to measure the energy data of distributed photovoltaic lines. The photovoltaic grid-connected box may include an energy meter connected to the distributed photovoltaic lines; for example, in a photovoltaic power generation system including three distributed photovoltaic lines, each distributed photovoltaic line is connected to a photovoltaic grid-connected box.

[0074] Specifically, based on the second communication module connected between the electric energy meter and the processor, the processor can obtain the electric energy data of the electric energy meter through the second communication module, that is, collect the photovoltaic power generation data of the distributed photovoltaic line, and then the processor can transmit the collected electric energy data to the terminal through the first communication module, and realize real-time monitoring of the photovoltaic power generation through the terminal.

[0075] In one embodiment, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, including a measurement and control device, and an operating switch for connecting between the incoming line of a photovoltaic power generation system and a disturbance load; and an electrical locking module for connecting between the operating switch and the grid-connected incoming line switch of the incoming line of the photovoltaic power generation system. 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.

[0076] Among them, the electrical interlocking module can be used to realize the electrical interlocking between the operating switch and the grid-connected incoming line switch of the photovoltaic power generation system incoming line.

[0077] Specifically, by connecting the electrical locking module between the operating switch and the grid-connected incoming line switch of the photovoltaic power generation system, the interlocking between the operating switch and the grid-connected incoming line switch is achieved, thereby preventing the operating switch from being operated incorrectly, which may cause the disturbance load to be mistakenly put into operation, thereby improving the safety performance of the system.

[0078] In one embodiment, Figure 4 As shown, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, including a measurement and control device 410, and an operation switch 420 for connecting between the incoming line of the photovoltaic power generation system and the disturbance load; and also including a delay protection device 440 for connecting the operation switch 420. The measurement and control device 410 includes a drive control module 411 connected to the operation switch 420, a collection module 413 connected to the incoming line of the photovoltaic power generation system, and a processor 415 connected to the drive control module 411 and the collection module 413 respectively.

[0079] The time delay protection device 440 may be used to provide time delay protection for the operating switch.

[0080] Specifically, the time delay protection device 440 is connected to the operation switch 420, and the time delay protection is applied to the operation switch 420. When the disturbance load is put into operation, the time delay protection device 440 is started to start the delay preset time. When the time when the disturbance load is put into operation is greater than or equal to the delay preset time, the operation switch 420 is disconnected, thereby preventing the disturbance load from being heated and burned due to long-term connection of the disturbance load, thereby improving the system reliability.

[0081] Furthermore, if the operating switch is a circuit breaker, the delay protection organization connects the opening coil of the circuit breaker to automatically disconnect the operating switch when the time when the disturbance load is put into operation reaches the preset delay time, thereby preventing the disturbance load from heating and burning.

[0082] In a specific embodiment, the time delay protection device includes an intermediate relay and a time relay respectively connected to the operating switch; the intermediate relay is connected to the time relay.

[0083] Among them, the time relay can be used to delay the timing of the operation switch, and the intermediate relay can be used to disconnect the operation switch when the delay timing is reached.

[0084] Specifically, the operating switch is connected to the intermediate relay and the time relay respectively; the intermediate relay is connected to the time relay. When the operating switch is closed, the time relay is triggered to start, and the time relay starts timing. When the delay preset time is reached, the intermediate relay is triggered to start, and the operating switch is disconnected through the intermediate relay. The delay protection device of the operating switch is formed by the intermediate relay and the time relay, so as to realize the overheat protection of the disturbance load.

[0085] In one embodiment, Figure 5 As shown, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, including a measurement and control device, and an operating switch for connecting between the incoming line of the photovoltaic power generation system and the disturbance load. The measurement and control device includes a drive control module connected to the opening and closing coil of 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.

[0086] Specifically, the public transformer low-voltage integrated distribution box can usually be connected to three-way distributed photovoltaic power generation (that is, the public transformer low-voltage integrated distribution box can include the first photovoltaic power generation system incoming line, the second photovoltaic power generation system incoming line and the third photovoltaic power generation system incoming line), and the above-mentioned photovoltaic low-voltage safety control and intelligent adjustment integrated equipment can be installed at the incoming line switch of the photovoltaic power generation system. When the system is operating normally, the three-phase imbalance of the three incoming lines can be controlled; when the maintenance personnel need to inspect the distribution transformer or the three-way incoming line, the distributed photovoltaic power generation on the line may have an islanding effect, and the three-way incoming line can be adjusted against the islanding effect to destroy all possible islanding operations under the line.

[0087] Furthermore, during non-maintenance periods, when the photovoltaic power generation system operates normally, the acquisition module can collect the voltage, current, frequency, harmonics and other electrical energy parameter information of the photovoltaic power generation system's incoming line, receive and process the electrical energy parameter information through the processor, obtain the three-phase imbalance, and determine the electrical load that needs to be changed based on the obtained three-phase imbalance. The processor notifies the corresponding phase-changing switch through the second communication module to switch the electrical load to achieve the management of the three-phase imbalance. In one example, the second communication module can also be used to connect to the electric energy meter of the photovoltaic grid-connected box, collect photovoltaic power generation data of each distributed photovoltaic, and report it to the terminal to achieve real-time monitoring of photovoltaic power generation.

[0088] During the maintenance period, the photovoltaic grid-connected incoming switch is opened. If there is no electrified island operation, the maintenance personnel will perform normal maintenance; if there is an electrified island, the maintenance personnel can destroy the island in four ways: the first is that the terminal communicates with the processor through the first communication module, and the processor communicates with the photovoltaic grid-connected switch through the second communication module, and then can choose to cut off several large-power distributed photovoltaics, so that the corresponding photovoltaic grid-connected switches are disconnected, thereby changing the power balance state and eliminating the island. The second is that the terminal communicates with the processor through the first communication module, and the processor selects to close the corresponding operation switch, and then puts in the disturbance load to destroy all possible islands under the line. The third is that the terminal communicates with the processor through the first communication module, and the processor selects to close the corresponding phase-changing switch, transfers power between phase lines, increases the imbalance between phase lines, changes the power balance state through load power disturbance, and eliminates the island. The fourth is that when the network is limited and the communication module (the first communication module and the second communication module) cannot be used, the maintenance personnel can go to the site for manual operation, put in the disturbance load, and destroy the island. In one example, after the disturbance load is switched on by the operating switch, if the switching-on time exceeds a preset delay time (eg, the delay time is set to 1 second), the operating switch is triggered to be disconnected to prevent the disturbance load from overheating and burning.

[0089] The above-mentioned photovoltaic low-voltage safety control and intelligent regulation integrated equipment can perform real-time three-phase imbalance adjustment when three-phase imbalance occurs in the operation of the photovoltaic power generation system; when the photovoltaic power generation system occurs island operation, anti-islanding processing can be carried out in time to destroy unplanned island operation, reduce the cost of anti-islanding processing, and improve the reliability of system operation.

[0090] In one embodiment, the photovoltaic low-voltage safety control and intelligent regulation integrated device further includes a power supply module for connecting the measurement and control device. The power supply module includes a power converter and a power supply battery connected to the power converter, wherein the power converter may be an isolated AC / DC converter; and the power supply battery may be a lead-acid battery. The measurement and control device is connected through the power supply module, and then the working power can be provided to the measurement and control device to ensure that the measurement and control device can work continuously.

[0091] In one embodiment, a photovoltaic low-voltage safety control and intelligent regulation integrated device is provided, which also includes a cabinet for installing a measurement and control device, a disturbance load and an operating switch. The cabinet is a top-mounted cabinet, a wall-mounted cabinet or a floor-standing cabinet.

[0092] Among them, the pole-mounted cabinet refers to a cabinet that can be hung on a pole; the wall-mounted cabinet refers to a cabinet that can be hung on a wall; and the floor-standing cabinet refers to a cabinet that can stand on the ground.

[0093] Specifically, Figure 6As shown in the figure, it is a schematic diagram of the structure of the pole-mounted cabinet. The upper and lower ends of the pole-mounted cabinet are respectively provided with hanging holes, and the cabinet can be hung on the pole through clamps and expansion screws. Figure 7 As shown in FIG. 1 , it is a schematic diagram of the structure of a wall-mounted cabinet. A preset number of hanging holes (for example, 6 hanging holes) are respectively provided on the left and right sides of the wall-mounted cabinet, so that the cabinet can be hung on the wall. Figure 8 The figure is a schematic diagram of the structure of a floor-standing cabinet. A bracket is provided at the bottom of the floor-standing cabinet to enable the cabinet to stand on the ground.

[0094] In a specific embodiment, Fig. 9 , which is a schematic diagram of the internal configuration of the cabinet of the photovoltaic low-voltage safety control and intelligent regulation integrated equipment. The cabinet can be equipped with a measurement and control device 910, a first communication module and a second communication module matched with the measurement and control device 910, a time relay 970, an isolated AC / DC converter 980, two lead-acid batteries 990, three operating switches 940, three disturbance loads 950, and three intermediate relays 960. The first communication module includes a first communication antenna 920; the second communication module includes a second communication antenna 930.

[0095] Specifically, the measuring module and the operating switch 940 of the measurement and control device 910 are respectively connected to the distributed photovoltaic power generation system through the incoming cable; the first communication module and the second communication module are respectively connected to the processor of the measurement and control device 910; each operating switch 940 is connected to each disturbance load 950 one by one through a cable; the time relay 970 and each intermediate relay 960 are connected to the opening coil of the operating switch 940 through the wiring terminal 962, forming a delay protection device of the operating switch 940; the drive control module of the measurement and control device 910 is connected to the closing and closing coils of the operating switch 940 to realize the opening and closing functions of the remote control operating switch; the isolated AC / DC converter 980 is connected to the lead-acid battery 990 to provide working power for the measurement and control device, ensuring that the intelligent measurement and control device can work continuously.

[0096] Furthermore, the working process of the above-mentioned photovoltaic low-voltage safety control and intelligent regulation integrated equipment is as follows: when the photovoltaic power generation system is working normally, the power parameter information of the incoming line is collected through the acquisition module of the measurement and control device, and the power parameter information is processed by the processor of the measurement and control device to obtain the three-phase imbalance, and the corresponding phase-changing switch is notified to switch the power load according to the processing result to achieve three-phase imbalance control. At the same time, the power generation data of each distributed photovoltaic can be collected through the second communication module, and transmitted to the terminal through the first communication module to realize photovoltaic power generation monitoring. When maintenance personnel repair the photovoltaic power generation system, if the distributed photovoltaic power generation system produces unplanned island operation, they can remotely control and cut off several distributed photovoltaics, remotely control the closing operation switch or remotely control the switching of the phase-changing switch through the terminal, thereby changing the power balance state, destroying the unplanned island operation, reducing the cost of anti-island processing, and improving the reliability of system operation.

[0097] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A photovoltaic low-voltage safety control and intelligent regulation integrated device, characterized in that: It includes a measurement and control device and an operating switch connected between the incoming line of the photovoltaic power generation system and the disturbance load; the measurement and control device includes: A drive control module connected to the operating switch; the drive control module is used to drive the operating switch on and off; A collection module connected to the incoming line of the photovoltaic power generation system; the collection module is used to collect electric energy parameter information of the incoming line of the photovoltaic power generation system; A processor connected to the drive control module and the acquisition module respectively; the processor is used to connect to the terminal; the processor receives and processes the electric energy parameter information to obtain a processing result; and when the processing result meets the anti-islanding adjustment condition, generates an anti-islanding request signal, and transmits the anti-islanding request signal to the terminal; the anti-islanding request signal is used to instruct the terminal to generate an anti-islanding execution signal, and transmits the anti-islanding execution signal to the processor; the processor is also used to turn on the corresponding operation switch according to the anti-islanding execution signal; The photovoltaic low-voltage safety control and intelligent regulation integrated device also includes a phase-changing switch for connecting between the photovoltaic power generation system incoming line and the photovoltaic grid-connected switch in the photovoltaic grid-connected box; the phase-changing switch is connected to the processor; When the processing result satisfies the three-phase unbalance adjustment condition, the processor switches the corresponding phase-changing switch to reduce the three-phase unbalance; The anti-islanding request signal is also used to instruct the terminal to generate a second anti-islanding execution signal and transmit the second anti-islanding execution signal to the processor; the processor is also used to switch the corresponding phase-changing switch according to the second anti-islanding execution signal to increase the three-phase imbalance.

2. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 1 is characterized in that: The three-phase unbalance adjustment condition is that the three-phase unbalance corresponding to the electric energy parameter information is greater than a first preset threshold; the processor is further configured to switch the corresponding phase-changing switch when the processing result is that the three-phase unbalance corresponding to the electric energy parameter information is greater than the first preset threshold; The anti-islanding adjustment condition is that the value of the electric energy parameter information is greater than a second preset threshold; The processor is further configured to generate the anti-islanding request signal when the processing result is that the value of the electric energy parameter information is greater than a second preset threshold.

3. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 1 is characterized in that: The measurement and control device also includes: A first communication module; the first communication module is used to connect the terminal and the processor respectively; The second communication module is used to connect the phase-changing switch and the processor respectively.

4. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 3 is characterized in that: 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 photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 3 is characterized in that: The second communication module is also used to connect to the photovoltaic grid-connected switch; The anti-islanding request signal is further used to instruct the terminal to generate a third anti-islanding execution signal, and transmit the third anti-islanding execution signal to the processor through the first communication module; the processor is further used to transmit a driving signal generated according to the third anti-islanding execution signal to the second 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; the driving signal is used to instruct the photovoltaic grid-connected switch to disconnect.

6. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 3 is characterized in that: The second communication module is also used to connect to the electric energy meter of the photovoltaic grid-connected box.

7. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 1 is characterized in that: It also includes an electrical locking module for connecting between the operating switch and the grid-connected incoming line switch of the photovoltaic power generation system, and a time delay protection device for connecting the operating switch.

8. The photovoltaic low-voltage safety control and intelligent regulation integrated equipment according to claim 7 is characterized in that: The time delay protection device comprises an intermediate relay and a time relay respectively connected to the operating switch; the intermediate relay is connected to the time relay.

9. The photovoltaic low voltage safety control and intelligent regulation integrated equipment according to any one of claims 1 to 8, characterized in that: It also includes a cabinet for installing the measurement and control device, the disturbance load and the operation switch; The cabinet body is a top-rod cabinet body, a wall-mounted cabinet body or a floor-standing cabinet body.

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