Method for adjusting generated power of photovoltaic system and corresponding device
By detecting the reverse power in a distributed photovoltaic system and adjusting the inverter output power, the problem of reverse power generation in the photovoltaic system is solved, and system stability and equipment safety are improved.
Patent Information
- Application Number
- CN202510130390.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-04-29
AI Technical Summary
In distributed photovoltaic systems, when photovoltaic power generation generates excess electrical energy, it may be transmitted to the upper power grid through the transformer for reverse transmission, thereby generating reverse power, resulting in instability of the photovoltaic system and equipment damage.
By obtaining the total output power of all inverters connected to each box transformer in the photovoltaic system on the AC side, and detecting whether there is reverse power in the user's main transformer, determine the target box transformer, and calculate the target power based on the reverse power and the total output power, adjust the output power of the inverter to achieve the target power.
It effectively reduces the reverse power generated by the photovoltaic system, improves the stability of the system and the safety of the equipment, and reduces the damage caused by the reverse power.
Smart Images
Figure CN119906100A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of electronic technology, and in particular to a method for adjusting the power generated by a photovoltaic system and a corresponding device. Background Art
[0002] A distributed photovoltaic system is a facility built near a user that can directly convert sunlight into electrical energy using solar cells. In a distributed photovoltaic system, when photovoltaic power generation generates excess electricity, it may be transmitted to the upper grid through a transformer for reverse transmission, thereby generating reverse power. Summary of the invention
[0003] The purpose of the present disclosure is to provide a method for adjusting the power generation of a photovoltaic system and a corresponding device to solve the technical problems existing in the related art.
[0004] In order to achieve the above objectives, in a first aspect, the present disclosure provides a method for adjusting power generation of a photovoltaic system, comprising: Obtain the total output power of all inverters connected to each box-type transformer in the photovoltaic system on the AC side; When it is detected that the user's main transformer has reverse power, the target box-type transformer is determined according to the total output power of all inverters connected to each box-type transformer on the AC side and the reverse power, wherein the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power; Determine the target power of each box-type transformer in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer; According to the target power, the output power of the inverter connected to each box-type transformer in the target box-type transformer is adjusted simultaneously so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
[0005] Optionally, determining the target power of each box-type transformer in the target box-type transformers according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformers includes: When the total output power corresponding to each box-type transformer in the target box-type transformers is greater than the reverse power, for each box-type transformer in the target box-type transformers, the target power corresponding to each box-type transformer is calculated based on the reverse power and the total output power corresponding to each box-type transformer.
[0006] Optionally, calculating the target power corresponding to each box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer includes: The target power corresponding to each box-type transformer is calculated according to the reverse power and the total output power corresponding to each box-type transformer by the following calculation formula:
[0007] in, is the target power corresponding to the x-th box-type transformer, is the total output power of the x-th box-type transformer, and P is the reverse power.
[0008] Optionally, determining the target power of each box-type transformer in the target box-type transformers according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformers includes: When the total output power corresponding to each box-type transformer in the target box-type transformer is less than the reverse power, the target power is determined according to the reverse power and the sum of the total output power corresponding to all box-type transformers in the target box-type transformer.
[0009] Optionally, determining the target power according to the reverse power and the sum of the total output powers corresponding to all box-type transformers in the target box-type transformers includes: According to the reverse power and the sum of the total output powers corresponding to all box-type transformers in the target box-type transformer, the target power is determined by the following calculation formula:
[0010] in, is the target power corresponding to the x-th box-type transformer, is the total output power of all inverters connected to the x-th box-type transformer, is the reverse power, is the total output power of all inverters connected to the Nth box-type transformer in the target box-type transformer, and N is the number of box-type transformers included in the target box-type transformer.
[0011] Optionally, according to the target power, simultaneously adjusting the output power of the inverter connected to each box-type transformer in the target box-type transformer so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power, includes: According to the number of inverters connected to each box-type transformer and the target power, the rated power percentage of each inverter in each box-type transformer is calculated by the intelligent subarray controller; According to the rated power percentage of each inverter, the output power of the inverter connected to each box-type transformer is adjusted simultaneously so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
[0012] In a second aspect, the present disclosure provides a photovoltaic system power generation adjustment device, comprising an acquisition module, a first determination module, a second determination module and a first adjustment module; The acquisition module is used to acquire the total output power of all inverters connected to each box-type transformer in the photovoltaic system on the AC side; The first determination module is used to determine the target box-type transformer according to the total output power of all inverters connected to each box-type transformer on the AC side and the reverse power when it is detected that the user's main transformer has reverse power, wherein the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power; The second determination module is used to determine the target power of each box-type transformer in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer; The first adjustment module is used to adjust the output power of the inverter connected to each box-type transformer in the target box-type transformer according to the target power, so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
[0013] Optionally, the second determining module is used to: When the total output power corresponding to each box-type transformer in the target box-type transformers is greater than the reverse power, for each box-type transformer in the target box-type transformers, the target power corresponding to each box-type transformer is calculated based on the reverse power and the total output power corresponding to each box-type transformer.
[0014] Optionally, the second determining module is used to: When the total output power corresponding to each box-type transformer in the target box-type transformer is less than the reverse power, the target power is determined according to the reverse power and the sum of the total output power corresponding to all box-type transformers in the target box-type transformer.
[0015] Optionally, the first adjustment module includes: A calculation module, used for calculating the rated power percentage of each inverter in each box-type transformer through the intelligent subarray controller according to the number of inverters connected to each box-type transformer and the target power; The second adjustment module is used to adjust the output power of the inverter connected to each box-type transformer according to the rated power percentage of each inverter, so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
[0016] In a third aspect, the present disclosure provides a photovoltaic system power generation adjustment device, including an intelligent sub-array controller, a reverse power detector, and a reverse power adjustment background; The intelligent sub-array controller is used to obtain the total output power of all inverters connected to each box-type transformer in the photovoltaic system on the AC side, and transmit the total output power to the power regulation background through the switch; The reverse power detection module is used to transmit the reverse power of the main transformer of the user detected to the power regulation background; The power regulation background is used to determine the target box-type transformer according to the total output power of all inverters connected to each box-type transformer on the AC side and the reverse power, wherein the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power, and according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer, determine the target power of each box-type transformer in the target box-type transformer, and input the target power into the intelligent sub-array controller; The intelligent subarray controller is further used to adjust the output power of the inverter connected to each box-type transformer in the target box-type transformer according to the target power, so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
[0017] In a fourth aspect, the present disclosure provides a non-temporary computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods provided in the first aspect of the present disclosure.
[0018] In a fifth aspect, the present disclosure provides a controller, comprising: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of any one of the methods provided in the first aspect of the present disclosure.
[0019] In a sixth aspect, the present disclosure provides a photovoltaic system, comprising the controller provided in the fifth aspect of the present disclosure.
[0020] In a seventh aspect, the present disclosure provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of any one of the methods provided in the first aspect of the present disclosure.
[0021] Through the above technical solution, when the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power generated by the user's main transformer, the target power of each box-type transformer in the target box-type transformer is determined according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer. Then, according to the target power, the output power of the inverter connected to each box-type transformer in the target box-type transformer is adjusted at the same time so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power. By adjusting the output power of the inverters in the box-type transformer at the same time so that the sum of the output power of the inverters connected to each box-type transformer reaches the target power, compared with adjusting the inverters one by one in the related art, the adjustment time can be reduced, and the efficiency of the adjustment can be improved, thereby reducing the reverse power generated by the photovoltaic system.
[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a schematic diagram of a photovoltaic system in the related art.
[0024] Figure 2 The diagram is a schematic diagram showing a method for adjusting power generation of a photovoltaic system according to an exemplary embodiment of the present disclosure.
[0025] Figure 3 is a schematic diagram showing a photovoltaic system according to an exemplary embodiment of the present disclosure.
[0026] Figure 4 The diagram is a schematic diagram showing a device for adjusting power generation of a photovoltaic system according to an exemplary embodiment of the present disclosure.
[0027] Figure 5 is a block diagram showing a controller according to an exemplary embodiment.
[0028] Figure 6 is a block diagram showing a photovoltaic system according to an exemplary embodiment. DETAILED DESCRIPTION
[0029] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0030] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.
[0031] The grid-connected modes of distributed photovoltaic systems include self-generation and self-use with surplus power connected to the grid, full access to the grid, and full self-use. According to the grid connection agreement, the grid-connected mode on the user side in certain special areas must adopt full self-use, requiring self-generation and self-use, and surplus power not connected to the grid, that is, photovoltaic power generation is connected to the grid, but not connected to the grid. However, in this grid-connected mode, anti-reverse power control measures need to be taken to prevent the excess power generated by photovoltaic power from being reversely transmitted to the superior power grid through the transformer. Among them, the grid connection can be photovoltaic power generation, which means that the direct current generated by the solar panels is converted into alternating current that meets the requirements of the municipal power grid through the grid-connected inverter, and the excess power is transmitted to the public grid.
[0032] In the related art, a reverse power detection module is usually set in a distributed photovoltaic system, and the reverse power of the photovoltaic system and the grid connection point is detected in real time according to the reverse power detection module, and then a control signal is generated according to the monitoring result, and the control signal is transmitted to the inverter to reduce the output power of the inverter one by one until it is balanced with the power load. Or the circuit breaker in the photovoltaic system is directly disconnected so that the power generation power of the photovoltaic system is less than the power corresponding to the power load.
[0033] like Figure 1 As shown, in this photovoltaic system, the photovoltaic module 4 generates electricity and converts the DC power into AC power through the string inverter 2, and then connects multiple box transformers 1 in parallel to form a photovoltaic line, which can also be a collector line. After that, the photovoltaic line can be connected to the 10kV bus 5 and connected to the power grid through the user's main transformer. During normal operation, photovoltaic power generation can be used by the loads of each branch of the power user, and the insufficient part is provided by the power grid. Among them, the bus 5 connects multiple photovoltaic lines, among which the two load lines on the leftmost side of the bus are user branches, and the load line on the rightmost side of the bus is a photovoltaic collector line, and each photovoltaic line is connected to multiple box transformers 1, and on each box transformer 1, multiple inverters 2 are connected, as well as corresponding intelligent sub-controllers, which are used to detect the power output of each inverter 2 connected to the box transformer 1 on the AC side.
[0034] In this photovoltaic system, each box-type transformer 1 is connected to at least ten inverters 2, and is also equipped with an intelligent sub-array controller 3. The intelligent sub-array controller 3 can be used to collect the real-time power output of the AC side of each inverter 2 connected to the low-voltage side of each box-type transformer 1 and the working status of each inverter 2 when reverse power occurs.
[0035] In the related art, a reverse power detection module 8 is usually set in the distributed photovoltaic system, and the reverse power of the photovoltaic system and the grid connection point is detected in real time according to the reverse power detection module 8, and then a control signal is generated according to the monitoring result, and the control signal is transmitted to the inverter 2 to reduce the output power of the inverter 2 one by one until it is balanced with the power load. Or the circuit breaker of the main circuit of the photovoltaic system is directly disconnected to make the power generation power of the photovoltaic system less than the corresponding power of the power consumption.
[0036] However, the inventors have found that if a branch connected to the photovoltaic system fails and is removed, the power load will drop suddenly, causing the photovoltaic system's power generation to be greater than the total power consumption of other user branches, which will lead to a sharp increase in the reverse power of the main transformer. If the method in the related art is continued to be used to adjust the output power of the inverter 2 one by one, it may result in a long adjustment time, generate a large amount of reverse power, and then cause reverse power.
[0037] If the reverse power protection method is adopted by directly cutting off the main circuit of the photovoltaic power generation unit with a circuit breaker, photovoltaic power generation cannot be effectively utilized, and frequent disconnection of the circuit breaker may cause damage.
[0038] In view of this, the present disclosure provides a method for adjusting the power generation of a photovoltaic system and a corresponding device to solve the technical problems existing in the above-mentioned related technologies.
[0039] like Figure 2 As shown, Figure 2 is a schematic diagram showing a method for adjusting power generation of a photovoltaic system according to an exemplary embodiment of the present disclosure, with reference to Figure 1 ,include: S201: Obtain the total output power of all inverters 2 connected to each box-type transformer 1 in the photovoltaic system on the AC side; S202: When it is detected that the user's main transformer has reverse power, determine the target box-type transformer according to the total output power of all inverters 2 connected to each box-type transformer 1 on the AC side and the reverse power, wherein the total output power of all inverters 2 connected to each box-type transformer 1 on the AC side in the target box-type transformer is less than or greater than the reverse power; S203: Determine the target power of each box-type transformer 1 in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer; S204: According to the target power, the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer is adjusted simultaneously, so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power.
[0040] Through the above technical solution, when the total output power of all inverters 2 connected to each box-type transformer 1 in the target box-type transformer on the AC side is less than or greater than the reverse power generated by the user's main transformer, the target power of each box-type transformer 1 in the target box-type transformer is determined according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer. Then, according to the target power, the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer is adjusted at the same time so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power. By adjusting the output power of the inverter 2 in the box-type transformer 1 at the same time so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power, compared with adjusting the inverter 2 one by one in the related art, the adjustment time can be reduced, and the efficiency of the adjustment can be improved, thereby reducing the reverse power generated by the photovoltaic system.
[0041] In addition, compared with the method of reducing the electric energy generated by the photovoltaic system by disconnecting the photovoltaic system circuit breaker in the related art, the loss of the equipment can be reduced, thereby increasing the service life of the equipment.
[0042] In order to enable those skilled in the art to better understand the method for adjusting the power generation of a photovoltaic system provided by the present disclosure, the above steps are described in detail with examples below.
[0043] For example, the box-type transformer 1 can be an integrated power device, and can be used for power distribution and control. At the input end of the box-type transformer 1, multiple inverters 2 are usually connected. The inverter 2 can convert the direct current generated by the photovoltaic system into alternating current, and transmit the alternating current to the box-type transformer 1. Therefore, the output power of the inverter 2 can directly affect the output power of the box-type transformer 1. In this embodiment, for each box-type transformer 1, the output power of each inverter 2 connected to the box-type transformer 1 can be obtained, and the output power of each inverter 2 is added to obtain the total output power of all inverters 2 connected to the box-type transformer 1.
[0044] For example, reverse power can be the power generated by the user branch during the photovoltaic system power generation process, which is greater than the power load demand, causing the power to flow back to the grid. When the user branch generates reverse power, it may have a certain impact on the stability of the photovoltaic system and the safety of the equipment. The user's main transformer can increase the low-voltage AC output of the inverter 2 to a high-voltage AC suitable for long-distance transmission.
[0045] In this embodiment, it is possible to detect in real time whether the user's main transformer has reverse power, which can be achieved by setting the bus 5 as follows: Figure 3The voltage sensor 10 shown and the current sensor 11 are arranged on the main transformer. Then, the current sensor 11 can be used to detect whether there is a secondary three-phase current on the main transformer, and the voltage sensor 10 can be used to detect whether there is a secondary three-phase voltage on the bus 5. When the secondary three-phase current and the secondary three-phase voltage are detected, the secondary three-phase current and the secondary three-phase voltage are multiplied to obtain the reverse power.
[0046] In this embodiment, when reverse power is detected in the photovoltaic system, the total output power of all inverters 2 connected to each box-type transformer 1 on the AC side can be compared with the reverse power, and the box-type transformer 1 whose total output power is greater than or less than the reverse power is determined as the target box-type transformer.
[0047] For example, after the target box-type transformer is determined, the target power for subsequent adjustment of the output power of the inverter 2 can be determined according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer.
[0048] In a possible manner, determining the target power of each box-type transformer 1 in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer includes: When the total output power corresponding to each box-type transformer 1 in the target box-type transformer is greater than the reverse power, for each box-type transformer 1 in the target box-type transformer, the target power corresponding to each box-type transformer 1 is calculated based on the reverse power and the total output power corresponding to each box-type transformer 1.
[0049] It should be understood that when the total output power corresponding to the target box-type transformer is greater than the reverse power, it can represent that reverse power has occurred in the photovoltaic system, but the reverse power is not particularly large. Therefore, when calculating the target power, the corresponding adjusted target power can be calculated based on the reverse power and the total output power corresponding to each box-type transformer 1.
[0050] The target power corresponding to each box-type transformer 1 can be calculated according to the reverse power and the total output power corresponding to each box-type transformer 1 by the following calculation formula:
[0051] in, is the target power corresponding to the x-th box-type transformer 1, is the total output power of the x-th box-type transformer 1, and P is the reverse power.
[0052] In a possible manner, determining the target power of each box-type transformer 1 in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer includes: When the total output power corresponding to each box-type transformer 1 in the target box-type transformer is less than the reverse power, the target power is determined according to the reverse power and the sum of the total output power corresponding to all box-type transformers 1 in the target box-type transformer.
[0053] It should be understood that when the total output power corresponding to the target box-type transformer is less than the reverse power, it can represent that reverse power has occurred in the photovoltaic system, and the reverse power is relatively large, and is likely to be much larger than the total output power corresponding to each box-type transformer 1 in the target box-type transformer. Therefore, when calculating the target power of each box-type transformer 1, it is necessary to calculate based on the sum of the total output power corresponding to each box-type transformer 1 in the target box-type transformer and the reverse power, and the embodiments of the present disclosure do not make specific limitations on this.
[0054] Among them, according to the reverse power and the sum of the total output powers corresponding to all box-type transformers 1 in the target box-type transformer, the target power is determined by the following calculation formula:
[0055] in, is the target power corresponding to the x-th box-type transformer 1, is the total output power of all inverters 2 connected to the x-th box transformer 1, is the reverse power, is the total output power of all inverters 2 connected to the Nth box-type transformer 1 in the target box-type transformer, and N is the number of box-type transformers 1 included in the target box-type transformer.
[0056] For example, after the target power is calculated, the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer can be adjusted simultaneously according to the target power, so that the sum of the output powers of all inverters 2 connected to each similar transformer reaches the target power, thereby ensuring that the electric energy generated by the photovoltaic system is balanced with the power load, and ensuring the stability of the photovoltaic system and the safety of the equipment during operation.
[0057] In a possible manner, according to the target power, the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer is adjusted simultaneously so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power, including: According to the number of inverters 2 connected to each box-type transformer 1 and the target power, the rated power percentage of each inverter 2 in each box-type transformer 1 is calculated by the smart sub-array controller 3; According to the rated power percentage of each inverter 2, the output power of the inverter 2 connected to each box-type transformer 1 is adjusted simultaneously so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power.
[0058] It should be understood that when the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer is adjusted according to the target power, it can be controlled by the intelligent sub-array controller 3. In this embodiment, after calculating the target power, the intelligent sub-array controller 3 can determine the rated power percentage of each inverter 2 connected to the box-type transformer 1 according to the target power corresponding to each box-type transformer 1 and the number of connected inverters 2, and then transmit the rated power percentage to the inverter 2, so that the inverter 2 adjusts the output power according to the rated power percentage, and then the sum of the output powers of all inverters 2 connected to each box-type transformer 1 can reach the target power.
[0059] Specifically, Figure 3 As shown, in the intelligent sub-array controller 3, the adjustment method is as follows: after receiving the target power value sent by the background, the intelligent sub-array controller 3 can first perform data processing, and then form a power adjustment instruction, wherein the power adjustment instruction can be to convert the target power into the percentage of the rated power of each inverter 2 connected to the corresponding box-type transformer 1. After that, in the box-type transformer 1, each connected inverter 2 adjusts the output power of the AC side according to the assigned rated power percentage until the intelligent sub-array controller 3 detects that the sum of the output power of all inverters 2 reaches the target power. By adjusting the output power of each inverter 2 in the box-type transformer 1 at the same time, the sum of the output power of all inverters 2 connected to the corresponding box-type transformer 1 can quickly reach the target power, thereby improving the stability of the photovoltaic system and the safety of the equipment. Compared with the method of adjusting by disconnecting the circuit breaker in the related art, the life of the equipment can be increased and the damage to the equipment can be reduced.
[0060] When adjusting the output power of each inverter 2 in the box-type transformer 1, the control can be performed through the background. The background can simultaneously calculate the target power of different box-type transformers 1, and control each corresponding intelligent sub-array controller 3, and maintain until the whole group of fast adjustment is completed, and the background is remotely reset, that is, a "reset" signal is sent to the intelligent sub-array controller 3, and the target power adjustment is released after a delay of 1s, completing the reverse power adjustment.
[0061] Through the above technical solution, when the photovoltaic installed capacity is relatively large and the grid-connected mode is fully adopted by the power users for their own use, if the branch load trips, the photovoltaic power generation power and the power load can be quickly balanced to prevent the transmission of electricity to the public power grid, and the efficiency of photovoltaic power generation can be improved, and the electricity cost of the power users can be reduced.
[0062] Based on the same concept, this embodiment also provides a photovoltaic system power adjustment device, referring to Figure 3 ,like Figure 3 As shown, it includes an intelligent sub-array controller 3, a reverse power detector and a reverse power regulation background 7; The intelligent sub-array controller 3 is used to obtain the total output power of all inverters 2 connected to each box-type transformer 1 in the photovoltaic system on the AC side, and transmit the total output power to the power regulation background 7 through the switch module; The reverse power detection module 8 is used to transmit the detected reverse power of the user's main transformer to the power regulation background 7; The power regulation background 7 is used to determine the target box-type transformer according to the total output power of all inverters 2 connected to each box-type transformer 1 on the AC side and the reverse power, wherein the total output power of all inverters 2 connected to each box-type transformer 1 in the target box-type transformer on the AC side is less than or greater than the reverse power, and according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer, determine the target power of each box-type transformer 1 in the target box-type transformer, and input the target power into the intelligent sub-array controller 3; The intelligent subarray controller 3 is also used to adjust the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer according to the target power, so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power.
[0063] like Figure 3 As shown, the connection mode of the specific devices set in the photovoltaic system, and the intelligent sub-array controller 3 is formed into a ring network through the switch module, and all inverters 2 under each box-type transformer are controlled to adjust the power at the same time until the target power is reached, thereby reducing the adjustment time and preventing the reverse power output to the public power grid. At the same time, the intelligent sub-array controller 3 forms a ring network, thereby improving the reliability of information transmission such as control instructions and target values. Among them, the switch module includes multiple sub-switches 6 and a main switch 9, each sub-switch 6 is connected to the intelligent sub-array controller 3, multiple sub-switches 6 and the main switch 9 are connected in series, and the main switch 9 is also connected to the power regulation background 7.
[0064] Based on the same concept, this embodiment also discloses a photovoltaic system power generation adjustment device, referring to Figure 4 , Figure 4 is a schematic diagram showing a photovoltaic system power generation adjustment device 400 according to an exemplary embodiment of the present disclosure, such as Figure 4 As shown, it includes an acquisition module 401, a first determination module 402, a second determination module 403 and a first adjustment module 404; The acquisition module 401 is used to acquire the total output power of all inverters 2 connected to each box-type transformer 1 in the photovoltaic system on the AC side; The first determination module 402 is used to determine the target box-type transformer according to the total output power of all inverters 2 connected to each box-type transformer 1 on the AC side and the reverse power when it is detected that the user's main transformer has reverse power, wherein the total output power of all inverters 2 connected to each box-type transformer 1 on the AC side in the target box-type transformer is less than or greater than the reverse power; The second determination module 403 is used to determine the target power of each box-type transformer 1 in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer 1 in the target box-type transformer; The first adjustment module 404 is used to adjust the output power of the inverter 2 connected to each box-type transformer 1 in the target box-type transformer according to the target power, so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power.
[0065] Optionally, the second determining module 403 is used to: When the total output power corresponding to each box-type transformer 1 in the target box-type transformer is greater than the reverse power, for each box-type transformer 1 in the target box-type transformer, the target power corresponding to each box-type transformer 1 is calculated based on the reverse power and the total output power corresponding to each box-type transformer 1.
[0066] Optionally, calculating the target power corresponding to each box-type transformer 1 according to the reverse power and the total output power corresponding to each box-type transformer 1 includes: The target power corresponding to each box-type transformer 1 is calculated according to the reverse power and the total output power corresponding to each box-type transformer 1 by the following calculation formula:
[0067] in, is the target power corresponding to the x-th box-type transformer 1, is the total output power of the x-th box-type transformer 1, and P is the reverse power.
[0068] Optionally, the second determining module 403 is used to: When the total output power corresponding to each box-type transformer 1 in the target box-type transformer is less than the reverse power, the target power is determined according to the reverse power and the sum of the total output power corresponding to all box-type transformers 1 in the target box-type transformer.
[0069] Optionally, determining the target power according to the reverse power and the sum of the total output powers corresponding to all box-type transformers 1 in the target box-type transformers includes: According to the reverse power and the sum of the total output powers corresponding to all box-type transformers 1 in the target box-type transformer, the target power is determined by the following calculation formula:
[0070] in, is the target power corresponding to the x-th box-type transformer 1, is the total output power of all inverters 2 connected to the x-th box transformer 1, is the reverse power, is the total output power of all inverters 2 connected to the Nth box-type transformer 1 in the target box-type transformer, and N is the number of box-type transformers 1 included in the target box-type transformer.
[0071] Optionally, the first adjustment module 404 includes: A calculation module, used for calculating the rated power percentage of each inverter 2 in each box-type transformer 1 through the smart sub-array controller 3 according to the number of inverters 2 connected to each box-type transformer 1 and the target power; The second adjustment module is used to simultaneously adjust the output power of the inverter 2 connected to each box-type transformer 1 according to the rated power percentage of each inverter 2, so that the sum of the output power of the inverter 2 connected to each box-type transformer 1 reaches the target power.
[0072] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.
[0073] Based on the same concept, the present embodiment further discloses a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for adjusting the power generation of a photovoltaic system disclosed in the present embodiment are implemented.
[0074] Based on the same concept, this embodiment also discloses a controller, including: a memory having a computer program stored thereon; The processor is used to execute the computer program in the memory to implement the steps of the method for adjusting the power generation of the photovoltaic system disclosed in this embodiment.
[0075] Figure 5 FIG. 5 is a block diagram showing a controller 500 according to an exemplary embodiment. Figure 5 As shown, the controller 500 is provided with a memory 501 and a processor 502 .
[0076] Based on the same concept, this embodiment also discloses a photovoltaic system, including the controller provided by the embodiment of the present disclosure.
[0077] Figure 6 FIG. 6 is a block diagram showing a photovoltaic system 600 according to an exemplary embodiment. Figure 6 As shown, the photovoltaic system 600 is provided with the controller 500 provided in this embodiment.
[0078] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and the computer program has a code portion for executing the above-mentioned method for adjusting the power generated by the photovoltaic system when executed by the programmable device.
[0079] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0080] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0081] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A method for adjusting the power generation of a photovoltaic system, characterized in that: include: Obtain the total output power of all inverters connected to each box-type transformer in the photovoltaic system on the AC side; When it is detected that the user's main transformer has reverse power, the target box-type transformer is determined according to the total output power of all inverters connected to each box-type transformer on the AC side and the reverse power, wherein the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power; Determine the target power of each box-type transformer in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer; According to the target power, the output power of the inverter connected to each box-type transformer in the target box-type transformer is adjusted simultaneously so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
2. The method for adjusting the power generation of a photovoltaic system according to claim 1, characterized in that: The determining the target power of each box-type transformer in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer comprises: When the total output power corresponding to each box-type transformer in the target box-type transformers is greater than the reverse power, for each box-type transformer in the target box-type transformers, the target power corresponding to each box-type transformer is calculated based on the reverse power and the total output power corresponding to each box-type transformer.
3. The method for adjusting the power generation of a photovoltaic system according to claim 2, characterized in that: The calculating the target power corresponding to each box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer includes: The target power corresponding to each box-type transformer is calculated according to the reverse power and the total output power corresponding to each box-type transformer by the following calculation formula: in, is the target power corresponding to the x-th box-type transformer, is the total output power of the x-th box-type transformer, and P is the reverse power.
4. The method for adjusting the power generation of a photovoltaic system according to claim 1, characterized in that: The determining the target power of each box-type transformer in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer comprises: When the total output power corresponding to each box-type transformer in the target box-type transformer is less than the reverse power, the target power is determined according to the reverse power and the sum of the total output power corresponding to all box-type transformers in the target box-type transformer.
5. The method for adjusting the power generation of a photovoltaic system according to claim 4, characterized in that: The determining the target power according to the reverse power and the sum of the total output powers corresponding to all box-type transformers in the target box-type transformers includes: According to the reverse power and the sum of the total output powers corresponding to all box-type transformers in the target box-type transformer, the target power is determined by the following calculation formula: in, is the target power corresponding to the x-th box-type transformer, is the total output power of all inverters connected to the x-th box-type transformer, is the reverse power, is the total output power of all inverters connected to the Nth box-type transformer in the target box-type transformer, and N is the number of box-type transformers included in the target box-type transformer.
6. The method for adjusting the power generation of a photovoltaic system according to claim 1, characterized in that: The step of adjusting the output power of the inverter connected to each box-type transformer in the target box-type transformer according to the target power so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power includes: According to the number of inverters connected to each box-type transformer and the target power, the rated power percentage of each inverter in each box-type transformer is calculated by the intelligent subarray controller; According to the rated power percentage of each inverter, the output power of the inverter connected to each box-type transformer is adjusted simultaneously so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
7. A photovoltaic system power generation adjustment device, characterized in that: It includes an acquisition module, a first determination module, a second determination module and a first adjustment module; The acquisition module is used to acquire the total output power of all inverters connected to each box-type transformer in the photovoltaic system on the AC side; The first determination module is used to determine the target box-type transformer according to the total output power of all inverters connected to each box-type transformer on the AC side and the reverse power when it is detected that the user's main transformer has reverse power, wherein the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power; The second determination module is used to determine the target power of each box-type transformer in the target box-type transformer according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer; The first adjustment module is used to adjust the output power of the inverter connected to each box-type transformer in the target box-type transformer according to the target power, so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
8. The photovoltaic system power generation adjustment device according to claim 7, characterized in that: The second determining module is used for: When the total output power corresponding to each box-type transformer in the target box-type transformers is greater than the reverse power, for each box-type transformer in the target box-type transformers, the target power corresponding to each box-type transformer is calculated based on the reverse power and the total output power corresponding to each box-type transformer.
9. The photovoltaic system power generation adjustment device according to claim 7, characterized in that: The second determining module is used for: When the total output power corresponding to each box-type transformer in the target box-type transformer is less than the reverse power, the target power is determined according to the reverse power and the sum of the total output power corresponding to all box-type transformers in the target box-type transformer.
10. The photovoltaic system power generation adjustment device according to claim 7, characterized in that: The first adjustment module includes: A calculation module, used for calculating the rated power percentage of each inverter in each box-type transformer through the intelligent subarray controller according to the number of inverters connected to each box-type transformer and the target power; The second adjustment module is used to adjust the output power of the inverter connected to each box-type transformer according to the rated power percentage of each inverter, so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
11. A photovoltaic system power generation adjustment device, characterized in that: Including intelligent sub-array controller, reverse power detector and reverse power regulation background; The intelligent sub-array controller is used to obtain the total output power of all inverters connected to each box-type transformer in the photovoltaic system on the AC side, and transmit the total output power to the power regulation background through the switch; The reverse power detection module is used to transmit the reverse power of the main transformer of the user detected to the power regulation background; The power regulation background is used to determine the target box-type transformer according to the total output power of all inverters connected to each box-type transformer on the AC side and the reverse power, wherein the total output power of all inverters connected to each box-type transformer in the target box-type transformer on the AC side is less than or greater than the reverse power, and according to the reverse power and the total output power corresponding to each box-type transformer in the target box-type transformer, determine the target power of each box-type transformer in the target box-type transformer, and input the target power into the intelligent sub-array controller; The intelligent subarray controller is further used to adjust the output power of the inverter connected to each box-type transformer in the target box-type transformer according to the target power, so that the sum of the output power of the inverter connected to each box-type transformer reaches the target power.
12. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.
13. A controller, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.
14. A photovoltaic system, characterized in that: Comprising a controller as claimed in claim 13.
15. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.