Photovoltaic control systems, methods, apparatuses, devices, and media

Abstract

The application relates to a photovoltaic control system, method, device, equipment and medium, the photovoltaic control system comprising: a photovoltaic panel unit array, a centralized conversion circuit module and a busbar circuit module; each photovoltaic panel unit in the photovoltaic panel unit array is configured with a corresponding conversion circuit unit and a bypass switch unit; when the photovoltaic panel unit is in a normal illumination state, the bypass switch unit is turned on, and the output signal of the photovoltaic panel unit is provided to the centralized conversion circuit module through the turned-on bypass switch unit; when the photovoltaic panel unit is in an illumination shielding state, the bypass switch unit is turned off, and the output signal of the photovoltaic panel unit is provided to the busbar circuit module through the conversion circuit unit; the busbar circuit module is used for outputting a target signal based on a first signal output by the centralized conversion circuit module and a second signal output by the conversion circuit unit, thereby solving the problems of large loss and reduced efficiency of a traditional distributed and multi-stage controller system.

Description

Technical Field

[0001] This application relates to the field of new energy, and in particular to a photovoltaic control system, method, apparatus, equipment and medium. Background Technology

[0002] With the increasing severity of the energy crisis, energy utilization and development have gradually become a focus of industrial research. Photovoltaic power generation, as an important component of the new energy field, has gradually attracted attention and further research.

[0003] In photovoltaic (PV) power generation control systems, PV panels typically employ a string-type distributed system. The PV panels output electricity, which is then boosted and inverted by a single-stage DC / DC converter before being supplied to the load or grid. However, this string-type distributed system has low control precision, assuming all PV panels operate under ideal light and temperature conditions. If any PV panel is partially shaded, the overall system efficiency decreases. To avoid this situation where partial shading of PV panels leads to a decrease in overall system efficiency, a distributed and multi-level controller system has emerged. This system uses distributed PV panels equipped with distributed controllers, allowing each PV panel in the system to achieve Maximum Power Point Tracking (MPPT) control under the control of its assigned controller. This enables micro-control of the PV panels. However, when all PV panels operate under ideal light and temperature conditions (i.e., when no PV panels are partially shaded), each controller is active, increasing system losses. Furthermore, the series connection between multiple controllers causes a progressive decrease in efficiency at each level. Summary of the Invention

[0004] In view of this, this application provides a photovoltaic control system, method, apparatus, equipment, and medium to solve the problems of high losses and reduced efficiency in traditional distributed and multi-level controller systems.

[0005] In a first aspect, this application provides a photovoltaic control system, including: a photovoltaic panel unit array, a centralized conversion circuit module, and a bus circuit module;

[0006] Each photovoltaic panel unit in the photovoltaic panel unit array is configured with a one-to-one conversion circuit unit and a bypass switch unit;

[0007] When the photovoltaic panel unit is under normal illumination, the bypass switch unit is turned on, and the output signal of the photovoltaic panel unit is provided to the centralized conversion circuit module through the turned-on bypass switch unit;

[0008] When the photovoltaic panel unit is in a state of shading, the bypass switch unit is turned off, and the output signal of the photovoltaic panel unit is provided to the bus circuit module through the conversion circuit unit;

[0009] The bus circuit module is used to output a target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

[0010] Optionally, the photovoltaic panel units in the same row of the photovoltaic panel unit array and the bypass switch units corresponding to the photovoltaic panel units are connected in series to form a photovoltaic branch;

[0011] The output terminal of each photovoltaic branch is electrically connected to the centralized conversion circuit module, and the output terminal of the centralized conversion circuit module is electrically connected to the first input terminal of the bus circuit module.

[0012] Optionally, the combiner circuit module includes: a combiner box, an energy storage unit, an inverter, and a filter;

[0013] The first input terminal of the combiner box is electrically connected to the output terminal of the centralized conversion circuit module, the second input terminal of the combiner box is electrically connected to the output terminal of the conversion circuit unit, and the output terminal of the combiner box is electrically connected to the energy storage unit.

[0014] The inverter is used to output an AC signal to the filter based on the DC signal provided by the energy storage unit;

[0015] The filter is used to output a target power signal based on the AC signal.

[0016] Secondly, this application provides a photovoltaic control method, including:

[0017] Obtain the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array.

[0018] The voltage difference comparison results for each photovoltaic panel unit are obtained by comparing and processing the open-circuit voltage information of each photovoltaic panel unit.

[0019] Based on the voltage difference comparison results of each photovoltaic panel unit, the working state of the bypass switch unit corresponding to each photovoltaic panel unit is controlled respectively;

[0020] If the bypass switch unit is in the ON state, the output signal of the photovoltaic panel unit corresponding to the bypass switch unit is transmitted to the centralized conversion circuit module through the bypass switch unit.

[0021] If the bypass switch unit is in the off state, the output signal of the photovoltaic panel unit corresponding to the bypass switch unit is transmitted to the target conversion circuit unit, which is a conversion circuit unit that is connected to the photovoltaic panel unit one by one.

[0022] The target signal is output based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

[0023] Optionally, the step of comparing the open-circuit voltage information of each photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit includes:

[0024] Based on the open-circuit voltage information of each photovoltaic panel unit, the open-circuit voltage of the photovoltaic panel in each photovoltaic branch is determined;

[0025] The comparison results of the photovoltaic panels in each photovoltaic branch are obtained by sorting and comparing the open-circuit voltages of the photovoltaic panels in each branch.

[0026] Based on the branch comparison results, target photovoltaic branches and non-target photovoltaic branches are determined;

[0027] Based on the branch voltage comparison results corresponding to the non-target photovoltaic branch, the voltage difference comparison results corresponding to each photovoltaic panel unit in the non-target photovoltaic branch are determined.

[0028] For each photovoltaic panel unit in the target photovoltaic branch, the open-circuit voltage of the photovoltaic panel unit is compared with the open-circuit voltage of a preset photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit in the target photovoltaic branch.

[0029] Optionally, determining the open-circuit voltage of the photovoltaic panels in each photovoltaic branch based on the open-circuit voltage information of each photovoltaic panel unit includes:

[0030] From the open-circuit voltage information of each photovoltaic panel unit, the open-circuit voltage information of each target photovoltaic panel unit in each photovoltaic branch is extracted;

[0031] For each photovoltaic branch, the open-circuit voltage of the photovoltaic branch is obtained by accumulating the open-circuit voltage information of each target photovoltaic panel unit.

[0032] Optionally, determining the target photovoltaic branch and non-target photovoltaic branches based on the branch comparison results includes:

[0033] Extract the branch voltage difference corresponding to any photovoltaic branch from the branch comparison results;

[0034] If the extracted branch voltage difference exceeds the preset branch voltage difference threshold, then the photovoltaic branch corresponding to the extracted branch voltage difference is determined as the target photovoltaic branch.

[0035] If the extracted branch voltage difference is lower than the preset branch voltage difference threshold, then the photovoltaic branch corresponding to the extracted branch voltage difference is determined as the non-target photovoltaic branch.

[0036] Optionally, controlling the operating state of the bypass switch unit corresponding to each photovoltaic panel unit based on the voltage difference comparison result of each photovoltaic panel unit includes:

[0037] For each of the photovoltaic panel units, the open-circuit voltage difference is determined based on the voltage difference comparison result;

[0038] If the open-circuit voltage difference exceeds the first voltage difference threshold, the working state of the bypass switch unit corresponding to the photovoltaic panel unit is set to the off state.

[0039] If the voltage difference comparison result is lower than the second voltage difference threshold, the working state of the bypass switch unit corresponding to the photovoltaic panel unit is set to the on state, and the second voltage difference threshold is not lower than the first voltage difference threshold.

[0040] Optionally, the preset photovoltaic panel unit can be any photovoltaic panel unit in the photovoltaic panel unit array, or the preset photovoltaic panel unit can be an adjacent photovoltaic panel unit in the photovoltaic panel unit array.

[0041] Thirdly, this application provides a photovoltaic control device, comprising:

[0042] The open-circuit voltage information acquisition module is used to acquire the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array.

[0043] The comparison processing module is used to perform comparison processing based on the open-circuit voltage information of each photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit;

[0044] The bypass switch control module is used to control the working state of the bypass switch unit corresponding to each photovoltaic panel unit according to the voltage difference comparison result of each photovoltaic panel unit.

[0045] The photovoltaic panel output voltage control module is used to control the output voltage of each photovoltaic panel unit based on the working state of the bypass switch unit corresponding to each photovoltaic panel unit.

[0046] The first output module is used to transmit the output signal of the photovoltaic panel unit corresponding to the bypass switch unit to the centralized conversion circuit module through the bypass switch unit when the working state of the bypass switch unit is the on state.

[0047] The second output module is used to transmit the output signal of the photovoltaic panel unit corresponding to the bypass switch unit to the target conversion circuit unit when the working state of the bypass switch unit is the open state. The target conversion circuit unit is a conversion circuit unit that is connected to the photovoltaic panel unit one by one.

[0048] The target output module is used to output a target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

[0049] Thirdly, this application provides a photovoltaic device including a photovoltaic control system as described in any of the first aspects.

[0050] Fourthly, this application provides a photovoltaic control device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0051] Memory, used to store computer programs;

[0052] When a processor executes a program stored in memory, it implements the steps of the photovoltaic control method as described in any of the second aspects.

[0053] Fifthly, this application provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the photovoltaic control method as described in any of the second aspects.

[0054] This application embodiment configures each photovoltaic panel unit in the photovoltaic panel unit array with a one-to-one corresponding conversion circuit unit and bypass switch unit. When the photovoltaic panel unit is under normal illumination, the bypass switch unit is turned on, allowing the output signal of the photovoltaic panel unit to be provided to the centralized conversion circuit module through the turned-on bypass switch unit. When the photovoltaic panel unit is under shading, the bypass switch unit is turned off, allowing the output signal of the photovoltaic panel unit to be provided to the bus circuit module through the conversion circuit unit. Thus, the bus circuit module can output the target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit. This achieves coarse control mode to control the output of the photovoltaic panel unit when the illumination conditions are good, thereby reducing switching losses, and micro control mode to control the output of the photovoltaic panel unit when shading occurs. This achieves the maximum overall efficiency of the system, reduces system losses, and solves the problems of high losses and reduced efficiency in traditional distributed and multi-level controller systems. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the structure of a photovoltaic control system provided in an embodiment of this application;

[0057] Figure 2 A schematic diagram of the structure of a photovoltaic control system is provided as an example of this application;

[0058] Figure 3 A schematic diagram of the structure of a photovoltaic control system is provided as another example of this application;

[0059] Figure 4 This is a schematic diagram of a photovoltaic panel unit array provided in an embodiment of this application;

[0060] Figure 5 A schematic diagram of a photovoltaic panel unit array in a light-shading state, provided as an embodiment of this application;

[0061] Figure 6 A schematic flowchart of a photovoltaic control method provided in an embodiment of this application;

[0062] Figure 7 This is a schematic diagram of the structure of a photovoltaic device provided in an embodiment of this application.

[0063] The diagram is labeled as follows: 110, photovoltaic panel unit array; 120, centralized conversion circuit module; 130, combiner circuit module; 111, photovoltaic panel unit; 112, conversion circuit unit; 113, bypass switch unit; V1, first signal; V2, second signal; Vdc, bus voltage signal; 210, photovoltaic branch; 131, combiner box; 132, energy storage unit; 133, inverter; 134, filter; Po, power signal; Zg, protection impedance; Km-n, short-circuit switch. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0065] Figure 1 This is a schematic diagram of a photovoltaic control system provided in an embodiment of this application. The photovoltaic control system specifically includes: a photovoltaic panel unit array 110, a centralized conversion circuit module 120, and a busbar module 130. Each photovoltaic panel unit 111 in the photovoltaic panel unit array 110 is configured with a corresponding conversion circuit unit 112 and a bypass switch unit 113. When the photovoltaic panel unit 111 is under normal illumination, the bypass switch unit 113 is turned on, and the output signal of the photovoltaic panel unit 111 is provided to the centralized conversion circuit module 120 through the turned-on bypass switch unit 113. When the photovoltaic panel unit 111 is under shading, the bypass switch unit 113 is turned off, and the output signal of the photovoltaic panel unit 111 is provided to the busbar module 130 through the conversion circuit unit 112. The busbar module 130 is used to output a target signal based on the first signal V1 output by the centralized conversion circuit module 120 and the second signal V2 output by the conversion circuit unit 112.

[0066] Specifically, the photovoltaic panel unit array in this embodiment may include a plurality of photovoltaic panel units 111 and a conversion circuit unit 112 corresponding to each photovoltaic panel unit 111, as well as a bypass switch unit 113. The photovoltaic panel unit array can generate electrical energy under illumination and output an electrical signal corresponding to the electrical energy. The electrical signal can be provided to the conversion circuit unit 112 and / or the centralized conversion circuit module 120, so that the conversion circuit unit 112 outputs a second signal V2, and / or the centralized conversion circuit module 120 outputs a first signal V1. The first signal V1 output by the centralized conversion circuit module 120 and the second signal V2 output by the conversion circuit unit 112 can be provided to the bus circuit module 130, so that the bus circuit module 130 can output a target signal based on the first signal V1 and the second signal V2 output by the conversion circuit unit 112.

[0067] Specifically, when a photovoltaic panel unit 111 in the photovoltaic panel unit array 110 is under normal illumination, the bypass switch unit 113 configured for that photovoltaic panel unit 111 is turned on to short-circuit the conversion circuit unit 112 connected to that photovoltaic panel unit 111, so that the conversion circuit unit 112 corresponding to that photovoltaic panel unit 111 does not work. The output signal of the photovoltaic panel unit 111 can be provided to the centralized conversion circuit module 120 through the turned-on bypass switch power supply 113, so that it can be converted by the centralized conversion circuit module 120, and output a first signal V1 based on the voltage obtained after conversion. Then, the first signal V1 is provided to the bus circuit module 130, so that the bus circuit module 130 can output the target signal according to the first signal V1 output by the centralized conversion circuit unit 112.

[0068] When a photovoltaic panel unit 111 in the photovoltaic panel unit array 110 is in a state of shading, the bypass switch unit 113 configured for that photovoltaic panel unit is disconnected to disconnect the connection between the photovoltaic panel unit and the centralized conversion circuit unit, so that the conversion circuit unit 112 connected to the photovoltaic panel unit 111 can start working. The output signal of the photovoltaic panel unit 111 can be converted by the conversion circuit unit 112, and a second signal V2 can be output based on the voltage obtained after conversion. Then, the second signal V2 can be provided to the bus circuit module 130, so that the bus circuit module 130 can output the target signal according to the second signal V2 output by the conversion circuit unit 112.

[0069] As can be seen, this embodiment of the application configures each photovoltaic panel unit in the photovoltaic panel unit array with a one-to-one corresponding conversion circuit unit and bypass switch unit. When the photovoltaic panel unit is in a normal illumination state, the bypass switch unit is turned on, so that the output signal of the photovoltaic panel unit can be provided to the centralized conversion circuit module through the turned-on bypass switch unit. When the photovoltaic panel unit is in a shading state, the bypass switch unit is turned off, so that the output signal of the photovoltaic panel unit is provided to the bus circuit module through the conversion circuit unit. Thus, the bus circuit module can output the target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit. This realizes the coarse control mode to control the output of the photovoltaic panel unit when the illumination conditions are good, so as to reduce switching losses, and the micro control mode to control the output of the photovoltaic panel unit when shading occurs. This achieves the maximum overall efficiency of the system, reduces system losses, and solves the problems of high losses and reduced efficiency in traditional distributed and multi-level controller systems.

[0070] In one optional embodiment, the photovoltaic panel units 111 in the same row of the photovoltaic panel unit array 110 and the bypass switch units 113 corresponding to the photovoltaic panel units 111 are connected in series to form a photovoltaic branch; the output terminal of each photovoltaic branch is electrically connected to the centralized conversion circuit module 120, and the output terminal of the centralized conversion circuit module 120 is electrically connected to the first input terminal of the bus circuit module 130.

[0071] Specifically, in the photovoltaic panel unit array 110 of this application embodiment, the photovoltaic panel unit 111 in the same row and the bypass switch unit 113 configured corresponding to the photovoltaic panel unit 111 can be connected in series to form a photovoltaic branch 210 in the photovoltaic panel unit array.

[0072] Figure 2This application provides a schematic diagram of a photovoltaic control system. In a photovoltaic panel unit array 110 containing m rows and n columns of photovoltaic panel units, every two photovoltaic panel units 111 in the same row can be connected by a bypass switch unit 113 corresponding to the previous photovoltaic panel. For example, the photovoltaic panel unit in the first row and first column can be connected to the photovoltaic panel unit in the second column of the first row through the bypass switch unit 113 corresponding to the photovoltaic panel unit in the first row and first column, and the photovoltaic panel unit in the second column of the first row can be connected to the photovoltaic panel unit in the third column of the first row through the bypass switch unit 113 corresponding to the photovoltaic panel unit in the second column of the first row, and so on. The bypass switch unit 113 corresponding to the photovoltaic panel unit in the (n-1)th column of the first row can be connected to the photovoltaic panel unit in the nth column of the first row, so that multiple photovoltaic panel units in the same row in the photovoltaic panel unit array 110 can be connected in series to form a photovoltaic branch 210. Each photovoltaic branch 210 in the photovoltaic panel unit array 110 can be electrically connected to the centralized conversion circuit module 120, allowing the photovoltaic panel unit 111 under normal illumination to provide an output signal to the centralized conversion circuit module 120 based on the generated electrical energy. The centralized conversion circuit module 120 can then perform voltage conversion based on the output signal from the photovoltaic panel unit. Furthermore, the output of the centralized conversion circuit module 120 can be electrically connected to the first input of the bus circuit module 130, thereby transmitting the first signal V1 obtained after voltage conversion to the bus circuit module 130. Here, n and m are both integers greater than 1.

[0073] Furthermore, each photovoltaic panel unit 111 can be configured with a corresponding conversion circuit unit 112. In one optional embodiment, the conversion circuit units 112 corresponding to each photovoltaic panel unit in the same photovoltaic branch can be connected in series to form a conversion circuit unit branch, and the output terminal of each conversion circuit unit branch can be electrically connected to the second input terminal of the busbar module 130. Of course, the output terminal of the conversion circuit unit 112 corresponding to each photovoltaic panel unit 111 can also be directly electrically connected to the second input terminal of the busbar module 130, and this application embodiment does not impose specific limitations on this. For example, when the output of the conversion circuit unit 112 corresponding to each photovoltaic panel unit 111 is directly electrically connected to the second input of the busbar module 130, when a photovoltaic panel unit 111 is in a state of shading, the bypass switch unit 113 corresponding to that photovoltaic panel unit 111 can be disconnected, so that the conversion circuit unit 112 connected to the photovoltaic panel unit 111 can start working. The output signal of the photovoltaic panel unit 111 can be converted by the conversion circuit unit 112, and the second signal V2 can be input to the second input of the busbar module 130 based on the converted voltage. This realizes the micro-control mode control of the output of the photovoltaic panel unit when the photovoltaic panel unit is shaded, thereby achieving the maximum overall efficiency of the system, reducing system losses, and solving the problem of efficiency reduction caused by multi-stage conversion.

[0074] Figure 3 The following is a schematic diagram of a photovoltaic control system provided as another example of this application. In this example, the combiner circuit module 130 may specifically include: a combiner box 131, an energy storage unit 132, an inverter 133, and a filter 134. The first input terminal of the combiner box 131 is electrically connected to the output terminal of the centralized conversion circuit module 120, the second input terminal of the combiner box 131 is electrically connected to the output terminal of the conversion circuit unit 122, and the output terminal of the combiner box 131 is electrically connected to the energy storage unit 132. The inverter 133 is used to output an AC signal to the filter 134 based on the DC signal provided by the energy storage unit 132. The filter 134 is used to output a target power signal based on the AC signal.

[0075] In practical processing, after receiving the first signal V1 input from the centralized conversion circuit module 120 and the second signal V2 input from the conversion circuit module 112, the combiner box 131 in this embodiment can output a bus voltage signal Vdc based on the first signal V1 and the second signal V2, and can provide the bus voltage signal Vdc to the energy storage unit 132 for storage. The energy storage unit 132 can provide a DC signal to the inverter 133 based on the stored electrical energy, so that the inverter 133 can perform inversion based on the DC signal provided by the energy storage unit 132 to convert DC power into AC power, and can output the AC signal obtained after inversion to the filter 134 for filtering based on the AC signal, so that the power signal Po obtained after filtering can be used as the target signal to provide to the power grid or load.

[0076] It should be noted that the photovoltaic panel unit in this application embodiment may include one or more photovoltaic panels, and this application embodiment does not impose specific limitations on this; the conversion circuit unit may include one or more DC-DC controllers; the bypass switch unit may include one or more bypass switches, such as a short-circuit switch K, and this application embodiment does not impose specific limitations on this.

[0077] Figure 4 This is a schematic diagram of a photovoltaic panel unit array provided in an embodiment of this application. In the case of an n*m photovoltaic panel array, each photovoltaic panel in the array can be considered a photovoltaic panel unit, and each photovoltaic panel can be equipped with a DC-DC controller as a conversion circuit unit corresponding to each photovoltaic panel unit. Thus, a unit module can be formed based on a photovoltaic panel and the DC-DC controller equipped with that photovoltaic panel. Each unit module can be equipped with a short-circuit switch as a bypass switch. Therefore, the photovoltaic array and DC-DC controller array constituted by the above structures can be used as a photovoltaic panel unit array. The short-circuit switch can be an electronic switch such as a relay, which conducts when the photovoltaic panel is under normal illumination conditions, allowing the output signal of the photovoltaic panel unit under normal illumination conditions to be provided to the centralized conversion circuit module (i.e.,...) through the conducting short-circuit switch. Figure 4 The centralized DC-DC converter is disconnected when the photovoltaic panel unit is in a shading state, so that the output signal of the photovoltaic panel unit in the shading state is provided to the combiner box through the conversion circuit unit. The combiner box can output the bus voltage signal Vdc based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit. Then, after passing through the DC-AC converter and the filter, the converted power signal Po can be obtained as the target signal. The power signal Po can be supplied to the grid or the load through the protective impedance Zg.

[0078] Specifically, when all photovoltaic panels in the photovoltaic panel unit array are under normal illumination conditions, all bypass switches are in the on state to short-circuit the DC-DC controller of each photovoltaic panel, so that all small DC-DC controllers in the photovoltaic panel unit array do not work. After the photovoltaic panel array is connected in series and parallel, the MPPT and boost functions are realized through the centralized DC-DC controller. At this time, V1 = Vdc, V2 = 0, thus eliminating the DC-DC conversion loss of each photovoltaic panel.

[0079] Figure 5 This is a schematic diagram of a photovoltaic panel unit array in a shading state provided in an embodiment of this application. When some photovoltaic panels in the photovoltaic panel unit array are shaded, such as when photovoltaic panels 1-1, 1-2, 2-1, and 2-2 in the photovoltaic panel unit array are all shaded, short-circuit switches K1-1, K1-2, K2-1, and K2-2 are all opened. This causes the small DC-DC controllers corresponding to the four photovoltaic panels 1-1, 1-2, 2-1, and 2-2 to start working and implement MPPT and boost functions. The other small DC-DC controllers do not work and are equivalent to wires. At this time, Vdc = V1 + V2. The system uses a small DC-DC controller for the shaded photovoltaic panel to perform local MPPT and boost functions, while the remaining photovoltaic panels are still controlled by a centralized DC-DC controller. This reduces the increased losses and decreased efficiency caused by multiple DC-DC controllers operating simultaneously, and allows for free switching between micro-control and coarse-control modes. It also avoids the situation where the power of other photovoltaic panels is reduced due to the shading of a single photovoltaic panel in coarse-control mode. When the shading is removed, the short-circuit switch closes, and the small DC-DC controller stops working. All photovoltaic panels are then centrally controlled by the centralized DC-DC controller, thus reducing system losses while achieving maximum power point tracking (MPPT).

[0080] In summary, this application implements a system by configuring each photovoltaic panel unit in the photovoltaic panel unit array with a one-to-one corresponding conversion circuit unit and bypass switch unit. When the photovoltaic panel unit is under normal illumination, the bypass switch unit is turned on, allowing the output signal of the photovoltaic panel unit to be provided to the centralized conversion circuit module through the turned-on bypass switch unit. When the photovoltaic panel unit is under shading, the bypass switch unit is turned off, allowing the output signal of the photovoltaic panel unit to be provided to the bus circuit module through the conversion circuit unit. This enables the bus circuit module to output the target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit. This achieves the coarse control mode for controlling the output of the photovoltaic panel unit under good illumination conditions to reduce switching losses, and the micro control mode for controlling the output of the photovoltaic panel unit under shading conditions. This maximizes the overall efficiency of the system, reduces system losses, and solves the problems of high losses and reduced efficiency in traditional distributed and multi-level controller systems.

[0081] Furthermore, this application also provides a photovoltaic control method. Figure 6 The present application provides a schematic flowchart of a photovoltaic control method, which may specifically include the following steps:

[0082] Step 610: Obtain the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array;

[0083] Among them, the open-circuit voltage information of the photovoltaic panel unit can be used to determine the voltage of the photovoltaic panel unit when it is in the open-circuit state, such as including the voltage value of the photovoltaic panel unit when it is in the open-circuit state.

[0084] Step 620: Based on the open-circuit voltage information of each photovoltaic panel unit, compare and process the data to obtain the voltage difference comparison results corresponding to each photovoltaic panel unit;

[0085] Specifically, in this embodiment, after obtaining the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array, the open-circuit voltages of each photovoltaic panel unit can be compared based on the open-circuit voltage information to obtain a voltage comparison result for each photovoltaic panel unit. This allows for the generation of a voltage difference comparison result, which can then be used to determine the illumination state of each photovoltaic panel unit in the photovoltaic panel unit array. The voltage difference comparison result may include the voltage comparison result of each photovoltaic panel unit in the photovoltaic panel unit array. The voltage comparison result of each photovoltaic panel unit can be used to determine the illumination state of that photovoltaic panel unit.

[0086] For example, after obtaining the open-circuit voltage information of each photovoltaic panel unit, the open-circuit voltage of each photovoltaic branch can be determined based on this information. Subsequently, target and non-target photovoltaic branches can be identified based on the open-circuit voltage of each branch. If the open-circuit voltage of a photovoltaic branch is less than a preset branch voltage threshold, it can be determined that there are photovoltaic panel units in that branch that are under shading, and that branch can be identified as a target photovoltaic branch. If the open-circuit voltage of a photovoltaic branch is not less than the preset branch voltage threshold, it can be determined that all photovoltaic panel units in that branch are under normal illumination, and that branch can be identified as a non-target photovoltaic branch. After identifying the target photovoltaic branch and the non-target photovoltaic branches, each photovoltaic panel unit in the target photovoltaic branch can be compared with each other photovoltaic panel unit in the target photovoltaic branch based on the open-circuit voltage information of each photovoltaic panel unit in the target photovoltaic branch. This will yield the voltage difference comparison result corresponding to each photovoltaic panel unit in the target photovoltaic branch. The working state of the bypass switch unit corresponding to the photovoltaic panel unit can then be controlled based on the voltage difference comparison result, i.e., step 630 is executed.

[0087] Step 630: Based on the voltage difference comparison results of each photovoltaic panel unit, control the working state of the bypass switch unit corresponding to each photovoltaic panel unit respectively.

[0088] The voltage difference comparison result may include: the voltage difference value obtained after comparing the open-circuit voltage of the photovoltaic panel unit with the preset open-circuit voltage of the photovoltaic panel unit; the working state of the bypass switch unit can be divided into the on state and the off state, and this application embodiment does not impose specific restrictions on this.

[0089] Specifically, in this embodiment, after determining the voltage difference comparison result corresponding to each photovoltaic panel unit, the operating state of each photovoltaic panel unit can be determined based on the voltage difference comparison result. For example, if the voltage difference comparison result exceeds a first voltage difference threshold, it can be determined that the photovoltaic panel unit corresponding to the voltage difference comparison result is in a light-blocking state; while if the voltage difference comparison result is lower than a second voltage difference threshold, it can be determined that the photovoltaic panel unit corresponding to the voltage difference comparison result is in a normal light-illuminating state. The first voltage threshold and the second voltage threshold can be the same voltage threshold or two different voltage thresholds. For example, the first voltage threshold can be greater than the second voltage threshold, etc. This embodiment does not impose specific limitations on this.

[0090] In this embodiment of the application, after determining the illumination state of each photovoltaic panel, the working state of the bypass switch unit corresponding to each photovoltaic panel unit can be controlled according to the illumination state of each photovoltaic panel unit. For example, when the illumination state of a certain photovoltaic panel unit is normal, that is, when a certain photovoltaic panel unit is in normal illumination state, the bypass switch unit corresponding to that photovoltaic panel unit can be controlled to be turned on, so that the bypass switch unit corresponding to that photovoltaic panel can enter the on state, and then step 640 is executed; while when the illumination state of a certain photovoltaic panel unit is abnormal, that is, when a certain photovoltaic panel unit is in illumination shading state, the bypass switch unit corresponding to that photovoltaic panel unit can be controlled to be turned off, so that the working state of the bypass switch unit can enter the off state, and then step 650 is executed.

[0091] Step 640: If the working state of the bypass switch unit is the on state, then the output signal of the photovoltaic panel unit corresponding to the bypass switch unit is transmitted to the centralized conversion circuit module through the bypass switch unit.

[0092] Specifically, when the bypass switch unit corresponding to a certain photovoltaic panel unit is in the on state, the on-state bypass switch unit can short-circuit the corresponding conversion circuit unit of the photovoltaic panel unit, thereby making the corresponding conversion circuit unit of the photovoltaic panel unit not work. The output signal of the photovoltaic panel unit can be provided to the centralized conversion circuit module through the on-state bypass switch, so as to be converted by the centralized conversion circuit module, and the first signal V1 is output based on the converted voltage, so that the target signal can be output based on the first signal V1 output by the centralized conversion circuit module.

[0093] Step 650: If the working state of the bypass switch unit is the open state, the output signal of the photovoltaic panel unit corresponding to the bypass switch unit is transmitted to the target conversion circuit unit. The target conversion circuit unit is a conversion circuit unit that is connected to the photovoltaic panel unit one by one.

[0094] Specifically, when the bypass switch unit corresponding to a certain photovoltaic panel unit is in the open state, the conversion circuit unit corresponding to that photovoltaic panel unit can be controlled to start working, so as to convert the output signal of the photovoltaic panel unit through the conversion circuit unit and output a second signal V2, so that the target signal can be output based on the second signal V2 output by the conversion circuit unit.

[0095] Step 660: Output the target signal based on the first signal V1 output by the centralized conversion circuit module and the second signal V2 output by the conversion circuit unit.

[0096] As can be seen, in this embodiment, after obtaining the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array, the open-circuit voltage information of each photovoltaic panel unit is compared and processed to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit. Subsequently, based on the voltage difference comparison result corresponding to each photovoltaic panel unit, the working state of the bypass switch unit corresponding to each photovoltaic panel unit can be controlled respectively, so that the bypass switch unit corresponding to the photovoltaic panel unit under normal illumination enters the conducting state, while the bypass switch unit corresponding to the photovoltaic panel unit under illumination blockage enters the disconnected state. Thus, the output signal of the photovoltaic panel unit under normal illumination can be transmitted to the collection through the conducting bypass switch unit. The intermediate conversion circuit module enables the centralized conversion circuit module to output a first signal, and the bypass switch unit to output a second signal corresponding to the photovoltaic panel unit in a state of shading. This allows the target signal to be output based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit, thereby realizing automatic switching between coarse control mode and micro control mode. For example, when the illumination conditions are good, the coarse control mode is used to control the output of the photovoltaic panel unit to reduce switching losses, while the micro control mode is used to control the output of the photovoltaic panel unit when shading occurs. This maximizes the overall efficiency of the system, reduces system losses, and solves the problems of high losses and reduced efficiency in traditional distributed and multi-level controller systems.

[0097] Based on the above embodiments, optionally, the embodiments of this application compare the open-circuit voltage information of each photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit. Specifically, this may include: determining the open-circuit voltage of each photovoltaic branch based on the open-circuit voltage information of each photovoltaic panel unit; sorting and comparing the open-circuit voltages of each photovoltaic branch to obtain a branch comparison result; determining the target photovoltaic branch and non-target photovoltaic branches based on the branch comparison result; determining the voltage difference comparison result corresponding to each photovoltaic panel unit in the non-target photovoltaic branch based on the branch voltage comparison result corresponding to the non-target photovoltaic branch; and comparing the open-circuit voltage of each photovoltaic panel unit in the target photovoltaic branch with the open-circuit voltage of a preset photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit in the target photovoltaic branch.

[0098] Specifically, in this embodiment, after obtaining the open-circuit voltage information of each photovoltaic panel unit, the open-circuit voltage of each photovoltaic branch can be determined based on the open-circuit voltage information of each photovoltaic panel in each photovoltaic branch. Then, the open-circuit voltages of each photovoltaic branch can be sorted and compared to obtain the branch comparison results for each photovoltaic branch. Subsequently, based on the branch comparison results of each photovoltaic branch, it can be determined whether each photovoltaic branch is a target photovoltaic branch with partially shaded photovoltaic panel units. This allows for the identification of all target and non-target photovoltaic branches in the photovoltaic panel unit array. A non-target photovoltaic branch can refer to a photovoltaic branch without partially shaded photovoltaic panel units, meaning that all photovoltaic panel units in a non-target photovoltaic branch are under normal illumination conditions.

[0099] Furthermore, in this embodiment, after determining the open-circuit voltage information of each photovoltaic panel unit, the open-circuit voltage information of photovoltaic panel units located in the same row can be extracted from the open-circuit voltage information of each photovoltaic panel unit. The open-circuit voltage of each photovoltaic branch can be determined based on the open-circuit voltage information of each photovoltaic panel unit located in the same row. For example, the open-circuit voltage information of each photovoltaic panel unit contained in each photovoltaic branch can be accumulated, and the sum of the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic branch can be used as the open-circuit voltage of the photovoltaic branch. Optionally, in this embodiment, the determination of the open-circuit voltage of the photovoltaic panel in each photovoltaic branch based on the open-circuit voltage information of each photovoltaic panel unit can specifically include: extracting the open-circuit voltage information of each target photovoltaic panel unit in each photovoltaic branch from the open-circuit voltage information of each photovoltaic panel unit; and for each photovoltaic branch, accumulating the open-circuit voltage information of each target photovoltaic panel unit to obtain the open-circuit voltage of the photovoltaic branch.

[0100] Optionally, in this embodiment of the application, the determination of target photovoltaic branches and non-target photovoltaic branches based on branch comparison results may specifically include: extracting the branch voltage difference corresponding to any photovoltaic branch from the branch comparison results; if the extracted branch voltage difference exceeds a preset branch voltage difference threshold, then the photovoltaic branch corresponding to the extracted branch voltage difference is determined as the target photovoltaic branch; if the extracted branch voltage difference is lower than the preset branch voltage difference threshold, then the photovoltaic branch corresponding to the extracted branch voltage difference is determined as a non-target photovoltaic branch. Specifically, in this embodiment, after determining the open-circuit voltage of each photovoltaic branch, the open-circuit voltage of each photovoltaic branch can be compared with the open-circuit voltage of a preset photovoltaic branch to obtain the branch comparison result of each photovoltaic branch. For example, by traversing the array, the open-circuit voltage of each photovoltaic branch in the photovoltaic panel unit array can be compared with the open-circuit voltage of any other photovoltaic branch in the photovoltaic panel unit array to obtain the branch comparison result of each photovoltaic branch. Then, the branch voltage difference of the photovoltaic branch can be determined based on the branch comparison result, and the branch voltage difference of the photovoltaic branch can be compared with a preset branch voltage difference threshold. When the branch voltage difference of a certain photovoltaic branch exceeds the threshold, the photovoltaic branch is identified as the target photovoltaic branch, and when the branch voltage difference of a certain photovoltaic branch is lower than the preset branch voltage difference threshold, the photovoltaic branch is identified as a non-target photovoltaic branch. This allows the illumination state of each photovoltaic panel in the photovoltaic panel unit array to be determined based on the target photovoltaic branch and the non-target photovoltaic branch.

[0101] For example, in this embodiment of the application, after determining the branch comparison result of each photovoltaic branch, the open-circuit voltage of each photovoltaic branch can be compared with that of other photovoltaic branches to obtain the voltage difference between the open-circuit voltage of each photovoltaic branch and that of other photovoltaic branches. Then, the voltage difference between the open-circuit voltage of each photovoltaic branch and that of other photovoltaic branches is calculated and sorted. For example, the voltage difference between the open-circuit voltage of each photovoltaic branch and that of other photovoltaic branches can be sorted from high to low, and calculations can be performed based on the sorting results to obtain the branch comparison result of each photovoltaic branch.

[0102] Of course, in addition to comparing the open-circuit voltage of each photovoltaic branch in the photovoltaic panel unit array with the open-circuit voltage of other photovoltaic branches in the photovoltaic panel unit array through a traversal method, the photovoltaic branch comparison results in this application embodiment can also be determined by other comparison methods, such as comparing the open-circuit voltage of each photovoltaic branch with the open-circuit voltage of the photovoltaic branch adjacent to it, or comparing the open-circuit voltage of each photovoltaic branch with a preset open-circuit voltage threshold for photovoltaic branches, etc. This application embodiment does not impose specific limitations on this.

[0103] In this embodiment, after identifying the target photovoltaic branch and non-target photovoltaic branches, the open-circuit voltage information of each photovoltaic panel unit in the target photovoltaic branch can be extracted to determine the open-circuit voltage of each photovoltaic panel unit in the target photovoltaic branch. The open-circuit voltage of each photovoltaic panel unit in the target photovoltaic branch can then be compared with the open-circuit voltage of a preset photovoltaic panel unit to obtain a voltage difference comparison result for each photovoltaic panel unit in the target photovoltaic branch. Specifically, the preset photovoltaic panel unit can refer to any photovoltaic panel unit in the photovoltaic panel unit array, or a photovoltaic panel unit adjacent to another photovoltaic panel unit in the photovoltaic panel unit array, or any photovoltaic panel unit in the non-target photovoltaic branch, etc. This embodiment does not impose specific limitations on these aspects.

[0104] For example, the open-circuit voltage of any photovoltaic panel unit under normal illumination conditions in the photovoltaic panel unit array is determined as the preset open-circuit voltage of the photovoltaic panel unit. The open-circuit voltage of each photovoltaic panel unit in the target photovoltaic branch is compared with the open-circuit voltage of the photovoltaic panel unit under normal illumination conditions. The voltage difference comparison result of each photovoltaic panel unit in the target photovoltaic branch is obtained so that the working state of the bypass switch unit corresponding to each photovoltaic panel unit in the target photovoltaic branch can be controlled based on the voltage difference comparison result of each photovoltaic panel unit in the target photovoltaic branch.

[0105] As can be seen, in this embodiment, after identifying all target photovoltaic branches and non-target photovoltaic branches in the photovoltaic panel unit array, the branch voltage comparison junction corresponding to the non-target photovoltaic branch can be used as the voltage difference comparison result corresponding to each photovoltaic panel unit in the non-target photovoltaic branch. This allows the working state of each photovoltaic panel unit in the non-target photovoltaic branch to be set to the on state based on the voltage difference comparison result. Thus, the output signal of each photovoltaic panel unit in the non-target photovoltaic branch can be transmitted to the centralized conversion circuit module via the bypass switch unit, causing the centralized conversion circuit module to output a first signal. Furthermore, for each photovoltaic panel unit in each target photovoltaic branch, the open-circuit voltage information of the photovoltaic panel unit can be obtained. Based on the open-circuit voltage information of each photovoltaic panel unit, the open-circuit voltage of each photovoltaic panel unit can be determined, thereby enabling each photovoltaic panel unit to operate in a controlled manner. The open-circuit voltage of the photovoltaic panel unit is compared with the open-circuit voltage of the preset photovoltaic panel unit to obtain the voltage difference comparison result of each photovoltaic panel unit in the target photovoltaic branch. This allows the operating state of the bypass switch unit corresponding to each photovoltaic panel unit in the target photovoltaic branch to be determined based on the voltage difference comparison result. For example, the open-circuit voltage difference of each photovoltaic panel unit in the target photovoltaic branch can be determined based on the voltage difference comparison result. When the open-circuit voltage difference of a certain photovoltaic panel unit exceeds the first voltage difference threshold, the operating state of the bypass switch unit corresponding to that photovoltaic panel unit is set to the off state; and when the open-circuit voltage difference of a certain photovoltaic panel unit is lower than the second voltage difference threshold, the operating state of the bypass switch unit corresponding to that photovoltaic panel unit is set to the on state.

[0106] Furthermore, in this embodiment of the application, after determining the voltage difference comparison results corresponding to each photovoltaic panel unit in the target photovoltaic branch, the open-circuit voltage difference corresponding to each photovoltaic panel unit can be determined based on the voltage difference comparison results. The open-circuit voltage difference of each photovoltaic panel unit can be compared with a preset first voltage difference threshold and a preset second voltage difference threshold. If the open-circuit voltage difference corresponding to the photovoltaic panel unit exceeds the preset first voltage difference threshold, it can be determined that the illumination state of the photovoltaic panel unit is a light-blocking state. Then, the bypass switch unit corresponding to the photovoltaic panel unit can be turned off, so that the photovoltaic panel unit can output the second signal V2 through the corresponding conversion circuit unit. If the open-circuit voltage difference corresponding to the photovoltaic panel unit is lower than the preset second voltage difference threshold, it can be determined that the photovoltaic panel unit is in a normal illumination state. Then, the bypass switch unit corresponding to the photovoltaic panel unit can be turned on, so that the photovoltaic panel unit can output the first signal V1 through the centralized conversion circuit module. Optionally, in this embodiment of the application, the operating state of the bypass switch unit corresponding to each photovoltaic panel unit is controlled according to the voltage difference comparison result of each photovoltaic panel unit. Specifically, this may include: for each photovoltaic panel unit, determining the open-circuit voltage difference based on the voltage difference comparison result; if the open-circuit voltage difference exceeds a first voltage difference threshold, then setting the operating state of the bypass switch unit corresponding to the photovoltaic panel unit to the off state; if the voltage difference comparison result is lower than a second voltage difference threshold, then setting the operating state of the bypass switch unit corresponding to the photovoltaic panel unit to the on state, wherein the second voltage difference threshold is not lower than the first voltage difference threshold. The first voltage difference threshold can be used to determine whether the photovoltaic panel unit is in a state of shading. For example, if the open-circuit voltage of a photovoltaic panel unit exceeds the first voltage difference threshold, it can be determined that the photovoltaic panel unit is in a state of shading; while if the open-circuit voltage of a photovoltaic panel unit does not exceed the first voltage difference threshold, it can be determined that the photovoltaic panel unit is in a state of non-shading. The second voltage difference threshold can be used to determine whether a photovoltaic panel unit is under normal illumination. For example, if the open-circuit voltage of a photovoltaic panel unit is lower than the second voltage difference threshold, it can be determined that the photovoltaic panel unit is under normal illumination; while if the open-circuit voltage of a photovoltaic panel unit is not lower than the second voltage difference threshold, it can be determined that the photovoltaic panel unit is under abnormal illumination. Optionally, the second voltage difference threshold is not lower than the first voltage difference threshold.

[0107] In summary, this embodiment of the application obtains the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array, and compares and processes this information to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit. Subsequently, based on the voltage difference comparison result, the operating state of the bypass switch unit corresponding to each photovoltaic panel unit can be controlled. This ensures that the bypass switch unit corresponding to the photovoltaic panel unit under normal illumination enters the conducting state, while the bypass switch unit corresponding to the photovoltaic panel unit under shading enters the disconnected state. Thus, the output signal of the photovoltaic panel unit under normal illumination can be controlled through the conducting bypass switch unit. The signal is transmitted to the centralized conversion circuit module, which outputs a first signal. The second signal, corresponding to the photovoltaic panel unit in a shaded state, is then output through the bypass switch unit. This allows for the subsequent output of the target signal based on the first signal from the centralized conversion circuit module and the second signal from the conversion circuit unit. This enables automatic switching between coarse control and micro control modes. For example, coarse control mode is used to control the output of the photovoltaic panel unit when lighting conditions are good, while micro control mode is used when shading occurs. This maximizes the overall system efficiency, reduces system losses, and solves the problems of high losses and reduced efficiency in traditional distributed and multi-level controller systems.

[0108] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps may be performed in other orders or simultaneously.

[0109] Figure 7 This is a schematic diagram of the structure of a photovoltaic device provided in an embodiment of this application. The photovoltaic control device 700 provided in this embodiment of the application may include the following modules:

[0110] The open-circuit voltage information acquisition module 710 is used to acquire the open-circuit voltage information of each photovoltaic panel unit in the photovoltaic panel unit array.

[0111] The comparison processing module 720 is used to perform comparison processing based on the open-circuit voltage information of each photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit;

[0112] The bypass switch control module 730 is used to control the working state of the bypass switch unit corresponding to each photovoltaic panel unit according to the voltage difference comparison result of each photovoltaic panel unit.

[0113] The photovoltaic panel output voltage control module 740 is used to control the output voltage of each photovoltaic panel unit based on the working state of the bypass switch unit corresponding to each photovoltaic panel unit.

[0114] The first output module 750 is used to transmit the output signal of the photovoltaic panel unit corresponding to the bypass switch unit to the centralized conversion circuit module through the bypass switch unit when the working state of the bypass switch unit is the on state.

[0115] The second output module 760 is used to transmit the output signal of the photovoltaic panel unit corresponding to the bypass switch unit to the target conversion circuit unit when the working state of the bypass switch unit is the open state. The target conversion circuit unit is a conversion circuit unit that is connected to the photovoltaic panel unit one by one.

[0116] The target output module 770 is used to output a target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

[0117] Optionally, the comparison processing module 720 may include the following sub-modules:

[0118] The photovoltaic panel open-circuit voltage determination submodule is used to determine the photovoltaic panel open-circuit voltage of each photovoltaic branch based on the open-circuit voltage information of each photovoltaic panel unit.

[0119] The branch comparison result determination submodule is used to sort and compare the photovoltaic panels based on the open-circuit voltage of each photovoltaic branch to obtain the branch comparison result;

[0120] The target photovoltaic branch determination submodule is used to determine the target photovoltaic branch and non-target photovoltaic branch based on the branch comparison results;

[0121] The non-target photovoltaic branch voltage difference comparison result determination submodule is used to determine the voltage difference comparison result corresponding to each photovoltaic panel unit in the non-target photovoltaic branch based on the branch voltage comparison result corresponding to the non-target photovoltaic branch;

[0122] The target photovoltaic branch voltage difference comparison result determination submodule is used to compare the open-circuit voltage of each photovoltaic panel unit in the target photovoltaic branch with the open-circuit voltage of a preset photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit in the target photovoltaic branch.

[0123] Furthermore, in the target photovoltaic branch voltage difference comparison result determination submodule of this application embodiment, the preset photovoltaic panel unit is any photovoltaic panel unit in the photovoltaic panel unit array, or a photovoltaic panel unit adjacent to the photovoltaic panel unit in the photovoltaic panel unit array, or any photovoltaic panel unit in a non-target photovoltaic branch.

[0124] Optionally, the photovoltaic panel open-circuit voltage determination submodule may include the following sub-units:

[0125] The open-circuit voltage information extraction subunit is used to extract the open-circuit voltage information of each target photovoltaic panel unit in each photovoltaic branch from the open-circuit voltage information of each photovoltaic panel unit.

[0126] The photovoltaic branch open-circuit voltage determination subunit is used to accumulate the open-circuit voltage information of each target photovoltaic panel unit for each photovoltaic branch to obtain the open-circuit voltage of the photovoltaic branch.

[0127] Optionally, the target photovoltaic branch determination submodule may include the following sub-units:

[0128] The branch voltage difference determination subunit is used to extract the branch voltage difference corresponding to any photovoltaic branch from the branch comparison results;

[0129] The target photovoltaic branch determination subunit is used to determine the photovoltaic branch corresponding to the extracted branch voltage difference as the target photovoltaic branch if the extracted branch voltage difference exceeds a preset branch voltage difference threshold.

[0130] The non-target photovoltaic branch determination subunit is used to determine the photovoltaic branch corresponding to the extracted branch voltage difference as the non-target photovoltaic branch if the extracted branch voltage difference is lower than the preset branch voltage difference threshold.

[0131] Optionally, the bypass switch control module 730 may include the following sub-modules:

[0132] Open-circuit voltage difference determination submodule: used to determine the open-circuit voltage difference for each of the photovoltaic panel units based on the voltage difference comparison results;

[0133] Bypass switch unit disconnect state setting submodule: used to set the working state of the bypass switch unit corresponding to the photovoltaic panel unit to disconnect state if the open circuit voltage difference exceeds the first voltage difference threshold.

[0134] Bypass switch unit conduction state setting submodule: If the voltage difference comparison result is lower than the second voltage difference threshold, the working state of the bypass switch unit corresponding to the photovoltaic panel unit is set to conduction state, and the second voltage difference threshold is not greater than the first voltage difference threshold.

[0135] Furthermore, the photovoltaic device provided in this application embodiment includes the photovoltaic control system provided in the above-mentioned embodiment.

[0136] Furthermore, this application embodiment also provides a photovoltaic control device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0137] Memory, used to store computer programs;

[0138] The processor, when executing a program stored in memory, implements the steps of the photovoltaic control method described in any of the method embodiments.

[0139] Furthermore, this application embodiment also provides a computer-readable storage medium storing a computer program thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the photovoltaic control method described in any one of the method embodiments.

[0140] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0141] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A photovoltaic control system, characterized in that, include: Photovoltaic panel unit array, centralized conversion circuit module and bus circuit module; Each photovoltaic panel unit in the photovoltaic panel unit array is configured with a one-to-one conversion circuit unit and a bypass switch unit; When the photovoltaic panel unit is under normal illumination, the bypass switch unit is turned on, and the output signal of the photovoltaic panel unit is provided to the centralized conversion circuit module through the turned-on bypass switch unit; When the photovoltaic panel unit is in a state of shading, the bypass switch unit is turned off, and the output signal of the photovoltaic panel unit is provided to the bus circuit module through the conversion circuit unit; The bus circuit module is used to output a target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

2. The photovoltaic control system according to claim 1, characterized in that, The photovoltaic panel units in the same row of the photovoltaic panel unit array and the bypass switch units configured corresponding to the photovoltaic panel units are connected in series to form a photovoltaic branch; The output terminal of each photovoltaic branch is electrically connected to the centralized conversion circuit module, and the output terminal of the centralized conversion circuit module is electrically connected to the first input terminal of the bus circuit module.

3. The photovoltaic control system according to claim 1 or 2, characterized in that, The combiner circuit module includes: combiner box, energy storage unit, inverter, and filter; The first input terminal of the combiner box is electrically connected to the output terminal of the centralized conversion circuit module, the second input terminal of the combiner box is electrically connected to the output terminal of the conversion circuit unit, and the output terminal of the combiner box is electrically connected to the energy storage unit. The inverter is used to output an AC signal to the filter based on the DC signal provided by the energy storage unit; The filter is used to output a target power signal based on the AC signal.

4. A photovoltaic control method, characterized in that, include: Obtain the open-circuit voltage of each photovoltaic panel unit in the photovoltaic panel unit array; The open-circuit voltage of each photovoltaic panel unit is compared with the open-circuit voltage of a preset photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit; Based on the voltage difference comparison results of each photovoltaic panel unit, the working state of the bypass switch unit corresponding to each photovoltaic panel unit is controlled respectively, so that the bypass switch unit corresponding to the photovoltaic panel unit in the normal illumination state enters the conduction state, while the bypass switch unit corresponding to the photovoltaic panel unit in the illumination blocking state enters the disconnection state. If the bypass switch unit is in the ON state, the output signal of the photovoltaic panel unit corresponding to the bypass switch unit is transmitted to the centralized conversion circuit module through the bypass switch unit. If the bypass switch unit is in the open state, the output signal of the photovoltaic panel unit corresponding to the bypass switch unit is transmitted to the target conversion circuit unit, which is a conversion circuit unit that is connected to the photovoltaic panel unit one by one. The target signal is output based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

5. The photovoltaic control method according to claim 4, characterized in that, The method further includes: Based on the open-circuit voltage of each photovoltaic panel unit, the open-circuit voltage of the photovoltaic panel in each photovoltaic branch is determined; The comparison results of the photovoltaic panels in each photovoltaic branch are obtained by sorting and comparing the open-circuit voltages of the photovoltaic panels in each branch. Based on the branch comparison results, target photovoltaic branches and non-target photovoltaic branches are determined; For the non-target photovoltaic branch, the working state of the bypass switch unit corresponding to all photovoltaic panel units in the non-target photovoltaic branch is set to the on state; For each photovoltaic panel unit in the target photovoltaic branch, the step of comparing the open-circuit voltage of each photovoltaic panel unit with the open-circuit voltage of a preset photovoltaic panel unit is performed to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit.

6. The photovoltaic control method according to claim 5, characterized in that, Based on the open-circuit voltage of each photovoltaic panel unit, the open-circuit voltage of the photovoltaic panel in each photovoltaic branch is determined, including: The open-circuit voltage of each target photovoltaic panel unit in each photovoltaic branch is extracted from the open-circuit voltage of each photovoltaic panel unit. For each photovoltaic branch, the open-circuit voltage of the photovoltaic branch is obtained by summing the open-circuit voltages of the target photovoltaic panels.

7. The photovoltaic control method according to claim 5, characterized in that, Determining target photovoltaic branches and non-target photovoltaic branches based on the branch comparison results includes: If the open-circuit voltage of the photovoltaic branch is lower than the preset branch voltage threshold, then the corresponding photovoltaic branch is determined as the target photovoltaic branch; If the open-circuit voltage of the photovoltaic branch is not lower than the preset branch voltage threshold, then the corresponding photovoltaic branch is determined as the non-target photovoltaic branch.

8. The photovoltaic control method according to claim 5, characterized in that, The preset photovoltaic panel unit is any photovoltaic panel unit in the photovoltaic panel unit array, or a photovoltaic panel unit adjacent to the photovoltaic panel unit in the photovoltaic panel unit array, or any photovoltaic panel unit in the non-target photovoltaic branch.

9. A photovoltaic control device, characterized in that, include: The open-circuit voltage acquisition module is used to acquire the open-circuit voltage of each photovoltaic panel unit in the photovoltaic panel unit array. The comparison processing module is used to compare the open-circuit voltage of each photovoltaic panel unit with the open-circuit voltage of a preset photovoltaic panel unit to obtain the voltage difference comparison result corresponding to each photovoltaic panel unit. The bypass switch control module is used to control the working state of the bypass switch unit corresponding to each photovoltaic panel unit according to the voltage difference comparison result of each photovoltaic panel unit, so that the bypass switch unit corresponding to the photovoltaic panel unit in the normal illumination state enters the conduction state, while the bypass switch unit corresponding to the photovoltaic panel unit in the illumination shading state enters the disconnection state. The photovoltaic panel output voltage control module is used to control the output voltage of each photovoltaic panel unit based on the working state of the bypass switch unit corresponding to each photovoltaic panel unit. The first output module is used to transmit the output signal of the photovoltaic panel unit corresponding to the bypass switch unit to the centralized conversion circuit module through the bypass switch unit when the working state of the bypass switch unit is the on state. The second output module is used to transmit the output signal of the photovoltaic panel unit corresponding to the bypass switch unit to the target conversion circuit unit when the working state of the bypass switch unit is the open state. The target conversion circuit unit is a conversion circuit unit that is connected to the photovoltaic panel unit one by one. The target output module is used to output a target signal based on the first signal output by the centralized conversion circuit module and the second signal output by the conversion circuit unit.

10. A photovoltaic device, characterized in that, It includes the photovoltaic control system as described in any one of claims 1-3.

11. A photovoltaic control device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in a memory, it implements the steps of the photovoltaic control method according to any one of claims 4-8.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the photovoltaic control method as described in any one of claims 4-8.

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