Photovoltaic control circuit, control method thereof and light storage system

Abstract

Embodiments of the present application provide a photovoltaic control circuit, a control method thereof and a photovoltaic storage system. The photovoltaic control circuit comprises a photovoltaic input power supply, a boost conversion module and a bypass switch. The photovoltaic input power supply is connected to a DC bus through the boost conversion module, and the bypass switch is connected between the photovoltaic input power supply and the DC bus. The photovoltaic voltage and the photovoltaic current of the photovoltaic input power supply are obtained. The switching state of a switch tube in the boost conversion module is controlled according to the photovoltaic voltage. In the case that the switch tube is in an off state, the switching state of the bypass switch is controlled according to the photovoltaic current. The embodiments of the present application increase the judgment of the current. After the bypass switch is closed, when the illumination weakens, the detected photovoltaic voltage is always equivalent to the bus voltage due to the closure of the bypass switch. At this time, the illumination intensity can only be judged by the photovoltaic current, so that the bypass switch can be timely disconnected. The switching state of the bypass switch can be timely and accurately controlled, and the efficiency and reliability of the system operation can be ensured.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a photovoltaic control circuit and its control method and a photovoltaic energy storage system. Background Technology

[0002] In related technologies, for photovoltaic (PV) inverters, when the PV voltage is high, the DC-DC conversion circuit for controlling the PV can be left off, and the PV voltage can be directly connected to the DC bus, achieving maximum operating efficiency for the PV inverter. The maximum efficiency of the PV inverter is a crucial parameter characterizing its performance. To further improve this efficiency, existing solutions incorporate a PV bypass relay. However, the control logic of the existing PV bypass relay has the following problems: when the PV voltage exceeds the given bus voltage, the PV bypass relay closes; when the PV voltage decreases, the bypass relay needs to open, but because the relay is closed, the detected PV voltage does not decrease, making timely disconnection difficult. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a photovoltaic control circuit and its control method, as well as a photovoltaic-energy storage system, designed to control the switching state of the photovoltaic bypass relay in a timely and accurate manner, ensuring the high efficiency and reliability of the system operation.

[0004] In a first aspect, embodiments of this application provide a control method for a photovoltaic control circuit. The photovoltaic control circuit includes a photovoltaic input power supply, a boost converter module, and a bypass switch. The photovoltaic input power supply is connected to a DC bus through the boost converter module, and the bypass switch is connected between the photovoltaic input power supply and the DC bus. The method includes:

[0005] Obtain the photovoltaic voltage and photovoltaic current of the photovoltaic input power supply;

[0006] The switching state of the switching transistor in the boost converter module is controlled according to the photovoltaic voltage;

[0007] When the switching transistor is in the off state, the switching state of the bypass switch is controlled according to the photovoltaic current.

[0008] According to some embodiments of this application, the boost converter module includes an inductor, a diode, and a switching transistor. The photovoltaic input power supply is connected to a DC bus through the inductor and the diode, and the input terminal of the switching transistor is connected between the inductor and the diode. Controlling the switching state of the switching transistor in the boost converter module according to the photovoltaic voltage includes at least one of the following:

[0009] When the photovoltaic voltage is greater than or equal to the given bus voltage, the switching transistor is turned off so that the photovoltaic voltage of the photovoltaic input power supply is supplied to the DC bus through the inductor and the diode;

[0010] When the photovoltaic voltage is less than the given bus voltage, the switching state of the switching transistor is adjusted based on the duty cycle to boost the photovoltaic voltage of the photovoltaic input power supply and supply it to the DC bus.

[0011] According to some embodiments of this application, one of the photovoltaic input power supplies is correspondingly connected to one of the boost converter modules; controlling the switching state of the bypass switch according to the photovoltaic current includes at least one of the following:

[0012] When the photovoltaic current exceeds a preset current threshold, the bypass switch is closed;

[0013] When the photovoltaic current is less than or equal to the preset current threshold, the bypass switch remains open.

[0014] According to some embodiments of this application, there are multiple boost converter modules and multiple bypass switches, with the multiple boost converter modules connected in parallel, and one photovoltaic input power supply correspondingly connected to multiple boost converter modules; the step of controlling the switching state of the bypass switch according to the photovoltaic current includes:

[0015] For each of the boost converter modules, when the photovoltaic current is greater than a preset current threshold, the switching state of the bypass switch is controlled according to the switching state of the switching transistor in at least one other boost converter module.

[0016] According to some embodiments of this application, controlling the switching state of the bypass switch based on the switching state of the switching transistors in at least one of the remaining boost converter modules includes at least one of the following:

[0017] When the switching transistor in at least one of the remaining boost converter modules is in the off state, the bypass switch is closed;

[0018] When the switching transistor in at least one of the remaining boost converter modules is in the ON state, the bypass switch remains OFF.

[0019] According to some embodiments of this application, controlling the switching state of the bypass switch based on the photovoltaic current further includes:

[0020] For each of the boost converter modules, when the photovoltaic current is less than or equal to the preset current threshold, the bypass switch is kept open.

[0021] Secondly, embodiments of this application provide a photovoltaic control circuit for executing the control method of the photovoltaic control circuit as described in the first aspect above. The photovoltaic control circuit includes a photovoltaic input power supply, a boost converter module, and a bypass switch. The photovoltaic input power supply is connected to a DC bus through the boost converter module, and the bypass switch is connected between the photovoltaic input power supply and the DC bus.

[0022] According to some embodiments of this application, the boost converter module includes an inductor, a diode, and a switching transistor. The photovoltaic input power supply is connected to the DC bus through the inductor and the diode, and the input terminal of the switching transistor is connected between the inductor and the diode.

[0023] According to some embodiments of this application, the number of the photovoltaic input power supply, the boost converter module, and the bypass switch is at least one, and one photovoltaic input power supply is connected to one boost converter module and one bypass switch.

[0024] According to some embodiments of this application, there are multiple boost converter modules and multiple bypass switches, and the multiple boost converter modules are connected in parallel. One photovoltaic input power supply is connected to multiple boost converter modules and multiple bypass switches.

[0025] Thirdly, embodiments of this application provide a photovoltaic energy storage system, including the photovoltaic control circuit described in the second aspect above.

[0026] Fourthly, embodiments of this application provide a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the photovoltaic control circuit described in the first aspect when running the computer program.

[0027] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for performing a control method for a photovoltaic control circuit as described in the first aspect above.

[0028] In a sixth aspect, embodiments of this application provide a computer program product, including a computer program or computer instructions, characterized in that the computer program or computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions to cause the computer device to perform the control method of the photovoltaic control circuit as described in the first aspect above.

[0029] According to the technical solution of this application embodiment, at least the following beneficial effects are achieved: First, this application embodiment acquires the photovoltaic voltage and photovoltaic current of the photovoltaic input power supply; then, this application embodiment controls the switching state of the switching transistor in the boost converter module based on the photovoltaic voltage; finally, when the switching transistor is in the off state, this application embodiment controls the switching state of the bypass switch based on the photovoltaic current. This application embodiment controls the switching state of the bypass switch based on the photovoltaic current after the switching transistor in the boost converter module is off. After the bypass switch is closed, when the light intensity decreases, the detected photovoltaic voltage remains equal to the bus voltage due to the closed bypass switch. At this time, the intensity of the light can only be judged by the photovoltaic current, thus allowing the bypass switch to be disconnected in a timely manner. Therefore, this application embodiment can control the switching state of the bypass switch in a timely and accurate manner, ensuring the high efficiency and reliability of the system operation.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0032] Figure 1 This is a circuit diagram of a photovoltaic control circuit provided in one embodiment of this application;

[0033] Figure 2 This is a circuit diagram of a photovoltaic control circuit provided in another embodiment of this application;

[0034] Figure 3 This is a circuit diagram of a photovoltaic control circuit provided in another embodiment of this application;

[0035] Figure 4 This is a flowchart of a control method for a photovoltaic control circuit provided in one embodiment of this application;

[0036] Figure 5 This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application;

[0037] Figure 6 This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application;

[0038] Figure 7 This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application;

[0039] Figure 8This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application;

[0040] Figure 9 Is it like this? Figure 1 and Figure 2 A flowchart of an embodiment of the control method for the photovoltaic control circuit shown;

[0041] Figure 10 Is it like this? Figure 3 A flowchart of an embodiment of the control method for the photovoltaic control circuit shown;

[0042] Figure 11 This is a schematic diagram of a controller for performing a control method for a photovoltaic control circuit according to an embodiment of this application. Detailed Implementation

[0043] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0044] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0046] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0047] In some situations, for photovoltaic (PV) inverters, when the PV voltage is high, the DC-DC conversion circuit of the PV system can be left unconnected, allowing the PV voltage to be directly connected to the DC bus. This maximizes the inverter's operating efficiency. The maximum efficiency of a PV inverter is a crucial parameter characterizing its performance. To further improve this efficiency, existing solutions incorporate PV bypass relays. However, a robust control method is lacking to ensure efficient and reliable operation under conditions of PV voltage fluctuations and parallel PV connections.

[0048] The existing control logic for photovoltaic bypass relays has two main problems: 1. When the photovoltaic voltage is greater than the given bus voltage, the photovoltaic bypass relay is closed. When the photovoltaic voltage decreases, the bypass relay needs to be opened, but because the relay is closed, the detected photovoltaic voltage will not decrease, making timely disconnection difficult. 2. When there are photovoltaic systems connected in parallel, closing one of them will cause circulating current, resulting in overcurrent on the switching transistor.

[0049] Based on the above, this application proposes a photovoltaic control circuit and its control method, as well as a photovoltaic energy storage system, which aims to control the switching state of the photovoltaic bypass relay in a timely and accurate manner, and can avoid circulating current, thereby ensuring the high efficiency and reliability of the system operation.

[0050] The various embodiments of the photovoltaic control circuit of this application will be further described below with reference to the accompanying drawings.

[0051] like Figure 1 As shown, Figure 1 This is a circuit diagram of a photovoltaic control circuit provided in one embodiment of this application.

[0052] In one embodiment, the photovoltaic control circuit includes, but is not limited to, a photovoltaic input power supply PV, a boost converter module 100, and a bypass switch K. The photovoltaic input power supply PV is connected to the DC bus through the boost converter module 100, and the bypass switch K is connected between the photovoltaic input power supply PV and the DC bus.

[0053] In one embodiment, the boost converter module 100 may be a boost module, including but not limited to an inductor L, a diode D, and a switch Q. The photovoltaic input power supply PV is connected to the DC bus through the inductor L and the diode D, and the input terminal of the switch Q is connected between the inductor L and the diode D.

[0054] In one embodiment, the bypass switch K can be a bypass relay switch.

[0055] In addition, such as Figure 2As shown, the photovoltaic control circuit includes, but is not limited to, two photovoltaic input power supplies PV, two boost converter modules 100, and two bypass switches K. The photovoltaic input power supplies PV, boost converter modules 100, and bypass switches K are in one-to-one correspondence. Each photovoltaic input power supply PV is connected to the DC bus through a corresponding boost converter module 100 and a bypass switch K.

[0056] It should be noted that, for Figure 2 The photovoltaic control circuit shown corresponds one-to-one with the photovoltaic input power supply PV, the boost converter module 100, and the bypass switch K. The number of photovoltaic input power supplies PV, boost converter modules 100, and bypass switches K can all be multiple; that is, the number of photovoltaic input power supplies PV, boost converter modules 100, and bypass switches K can be as follows: Figure 2 The two shown may also be more than one, and this application does not specifically limit this in the embodiments.

[0057] In addition, such as Figure 3 As shown, the photovoltaic control circuit includes, but is not limited to, a photovoltaic input power supply PV, two boost converter modules 100 and two bypass switches K. Multiple boost converter modules 100 are connected in parallel, and a photovoltaic input power supply PV is correspondingly connected to multiple boost converter modules 100 and multiple bypass switches K.

[0058] It should be noted that, for Figure 3 The photovoltaic control circuit shown depicts a photovoltaic input power supply PV corresponding to multiple boost converter modules 100 and multiple bypass switches K. The number of boost converter modules 100 and bypass switches K can both be multiple, i.e., the number of boost converter modules 100 and bypass switches K can be as follows: Figure 3 The two shown may also be more than one, and this application does not specifically limit this in the embodiments.

[0059] Based on the hardware structure of the photovoltaic control circuit in the above embodiments, the following presents various embodiments of the control method of the photovoltaic control circuit of this application.

[0060] like Figure 4 As shown, Figure 4 This is a flowchart of a control method for a photovoltaic control circuit provided in one embodiment of this application; the control method can be applied to the photovoltaic control circuit of any of the above embodiments, and the control method includes, but is not limited to, steps S410, S420 and S430.

[0061] Step S410: Obtain the photovoltaic voltage and photovoltaic current of the photovoltaic input power source;

[0062] Step S420: Control the switching state of the switching transistors in the boost converter module according to the photovoltaic voltage;

[0063] Step S430: When the switching transistor is in the off state, control the switching state of the bypass switch according to the photovoltaic current.

[0064] In one embodiment, firstly, the present application embodiment turns the switching transistor in the boost converter module on or off according to the magnitude of the photovoltaic voltage. Then, if the switching transistor in the boost converter module is turned off, the present application embodiment controls the switching state of the bypass switch according to the photovoltaic current.

[0065] It should be noted that the current judgment is added here for two reasons. First, when the current is low, the power consumption on the inductor and diode is also low. Closing the relay requires power from the relay's control winding, so leaving the relay open actually consumes less power. Second, after the bypass relay is closed, when the sunlight weakens, the detected photovoltaic voltage remains roughly equal to the bus voltage due to the relay's closure. In this case, the intensity of sunlight can only be determined by the current, allowing the relay to be opened in a timely manner. Therefore, the embodiments of this application can control the switching state of the bypass switch accurately and promptly, ensuring the high efficiency and reliability of the system operation.

[0066] Furthermore, the control of the switching state of the switching transistor in the boost converter module based on the photovoltaic voltage in step S420 above may include, but is not limited to, the following: Figure 5 and Figure 6 The two implementation scenarios shown are as follows:

[0067] like Figure 5 As shown, Figure 5 This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application; regarding the above step S420, it includes, but is not limited to, steps S510 and S520.

[0068] Step S510: Determine that the photovoltaic voltage is greater than or equal to the given bus voltage;

[0069] Step S520: Turn off the switching transistor so that the photovoltaic voltage of the photovoltaic input power supply is supplied to the DC bus through the inductor and diode.

[0070] In one embodiment, since the photovoltaic voltage can be boosted to the DC bus by the boost converter module, if the photovoltaic voltage is greater than or equal to the given bus voltage, it means that there is no need to boost the photovoltaic voltage. In this embodiment, the switching transistor is turned off to stop boosting the photovoltaic voltage. Then the photovoltaic voltage of the photovoltaic input power supply is supplied to the DC bus through the inductor and diode.

[0071] like Figure 6 As shown, Figure 6This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application; regarding the above step S420, it includes, but is not limited to, steps S610 and S620.

[0072] Step S610: Determine that the photovoltaic voltage is less than the given bus voltage;

[0073] Step S620: Adjust the switching state of the switching transistor based on the duty cycle to boost the photovoltaic voltage of the photovoltaic input power supply and supply it to the DC bus.

[0074] In one embodiment, since the photovoltaic voltage can be boosted to the DC bus through the boost converter module, if the photovoltaic voltage is less than the given bus voltage, it indicates that the photovoltaic voltage needs to be boosted. In this embodiment, the switching state of the switching transistor is adjusted based on the duty cycle to boost the photovoltaic voltage.

[0075] In addition, such as Figure 7 As shown, Figure 7 This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application; in the case where a photovoltaic input power supply is connected to a boost converter module and a bypass switch, i.e. Figure 1 and Figure 2 In the case of the circuit shown, the switching state of the bypass switch controlled according to the photovoltaic current in step S430 above includes, but is not limited to, steps S710, S720 and S730.

[0076] Step S710: Obtain the photovoltaic current of the photovoltaic input power source;

[0077] Step S720: When the photovoltaic current is greater than the preset current threshold, close the bypass switch;

[0078] Step S730: When the photovoltaic current is less than or equal to the preset current threshold, keep the bypass switch open.

[0079] In one embodiment, since closing the relay also requires power consumption in the relay's control winding, not closing the relay would actually result in lower power consumption. Therefore, if the light intensity decreases and causes the photovoltaic current to decrease to less than or equal to a preset current threshold, the relay may not be closed in order to ensure photovoltaic power. Conversely, if the light intensity increases and causes the photovoltaic current to increase to greater than the preset current threshold, the photovoltaic power is high, and the relay may be closed.

[0080] It is understood that the value of the aforementioned preset current threshold can be preset, and this application embodiment does not specifically limit it.

[0081] In addition, such as Figure 8 As shown, Figure 8This is a flowchart of a control method for a photovoltaic control circuit provided in another embodiment of this application; in the case where a photovoltaic input power supply is connected to multiple boost converter modules and multiple bypass switches, i.e., as shown... Figure 3 In the case of the circuit shown, the switching state of the bypass switch controlled according to the photovoltaic current in step S430 above includes, but is not limited to, steps S810, S820 and S830.

[0082] Step S810: For each boost converter module, obtain the photovoltaic current of the photovoltaic input power supply;

[0083] Step S820: When the photovoltaic current is greater than the preset current threshold, control the switching state of the bypass switch according to the switching state of the switching transistor in at least one other boost converter module.

[0084] Step S830: When the photovoltaic current is less than or equal to the preset current threshold, keep the bypass switch open.

[0085] In one embodiment, for Figure 3 The photovoltaic control circuit shown, when connected in parallel, will cause circulating current if one of the switching transistors is still in the switching operation state while the bypass relay in the other is closed. This will lead to a rapid increase in current, causing overcurrent faults or even damage to the switching transistors. To address this, this embodiment controls the switching state of the bypass relay based on the switching state of the switching transistors in at least one other boost converter module when the photovoltaic current exceeds a preset current threshold. Conversely, if the photovoltaic current is less than or equal to the preset current threshold, the bypass relay may not be closed to ensure photovoltaic power output.

[0086] In one embodiment, step S820 described above includes, but is not limited to, the following two implementations, which are detailed below:

[0087] The first implementation scenario: when the switching transistors in at least one other boost converter module are in the off state, close the bypass switch.

[0088] The second implementation scenario: When the switching transistors in at least one other boost converter module are in the on state, the bypass switch is kept open.

[0089] Based on the control methods of the photovoltaic control circuits in the above embodiments, the overall embodiments of the control methods of the photovoltaic control circuits of this application are presented below.

[0090] like Figure 9 As shown, Figure 9 Is it like this? Figure 1 and Figure 2The flowchart of an embodiment of the control method of the photovoltaic control circuit shown includes, but is not limited to, steps S910, S920, S930, S940, S950 and S960.

[0091] Step S910: Begin;

[0092] Step S920: Determine whether the photovoltaic voltage is greater than or equal to the given bus voltage. If yes, proceed to step S930; otherwise, proceed to step S960.

[0093] Step S930: Turn off the switching transistor in the boost converter module;

[0094] Step S940: Determine whether the photovoltaic current is greater than the preset current threshold. If yes, proceed to step S950; otherwise, proceed to step S960.

[0095] Step S950: Close the bypass switch;

[0096] Step S960: Disconnect the bypass switch.

[0097] In one embodiment, it can be first determined whether the photovoltaic voltage is greater than the given bus voltage. If it is, the boost converter module is turned off. Then it can be determined whether the photovoltaic current is greater than the threshold. If it is, the bypass relay is closed.

[0098] The addition of current detection serves two purposes. First, when the current is low, the power consumption on the inductor and diode is also low. However, closing the relay requires power consumption from the relay's control winding, so leaving the relay open actually consumes less power. Second, after the bypass relay is closed, when the sunlight weakens, the detected photovoltaic voltage remains equal to the bus voltage due to the relay's closure. In this case, the intensity of sunlight can only be determined by the current, allowing the relay to be opened in a timely manner.

[0099] like Figure 10 As shown, Figure 10 Is it like this? Figure 3 The flowchart of an embodiment of the control method of the photovoltaic control circuit shown includes, but is not limited to, steps S1010, S1020, S1030, S1040, S1050, S1060, S1070 and S1080.

[0100] Step S1010: Begin;

[0101] Step S1020: Determine whether the photovoltaic voltage is greater than or equal to the given bus voltage. If yes, proceed to step S1030; otherwise, proceed to step S1080.

[0102] Step S1030: Turn off the switching transistor in the boost converter module;

[0103] Step S1040: Determine whether the photovoltaic current is greater than the preset current threshold. If yes, proceed to step S1050; otherwise, proceed to step S1080.

[0104] Step S1050: Determine if there is a parallel connection. If there is, proceed to step S1060; otherwise, proceed to step S1070.

[0105] Step S1060: Determine whether the switching transistor in the other boost converter module is in the off state. If yes, proceed to step S1070; otherwise, proceed to step S1080.

[0106] Step S1070: Close the bypass switch;

[0107] Step S1080: Disconnect the bypass switch.

[0108] In one embodiment, the photovoltaic inverter typically has multiple photovoltaic inputs, such as... Figure 2 As shown, the two photovoltaic systems may be as follows: Figure 2 Input them separately, or they may be like... Figure 3 When inputs are connected in parallel, if one of the switching transistors is still in the switching operation state while the bypass relay of the other is closed, it will cause circulating current, the current will increase rapidly, leading to overcurrent faults or even damage to the switching transistor.

[0109] In response to this situation, the bypass relay is controlled as follows: Figure 10 As shown, in Figure 9 Based on the previous method, a judgment on whether the circuit is connected in parallel has been added. If parallel circuit exists, it is necessary to first determine whether the other circuit is in the closed state. Only if it is closed can the bypass relay be closed.

[0110] Furthermore, if there are three, four, or more photovoltaic inputs, the control is also as follows: Figure 10 As shown.

[0111] Based on the control methods of the photovoltaic control circuits in the above embodiments, the following presents various embodiments of the controller, photovoltaic control circuit, photovoltaic energy storage system, computer-readable storage medium, and computer program product of this application.

[0112] like Figure 11 As shown, Figure 11 This is a schematic diagram of a controller for executing a control method for a photovoltaic control circuit according to an embodiment of this application. The controller 200 implemented in this application includes: a processor 210, a memory 220, and a computer program stored in the memory 220 and executable on the processor 210, wherein... Figure 11 The example uses a processor 210 and a memory 220.

[0113] The processor 210 and the memory 220 can be connected via a bus or other means. Figure 11 Taking the example of a connection between China and Israel via a bus.

[0114] Memory 220, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 220 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 220 may optionally include remotely located memories 220 relative to processor 210, which can be connected to controller 200 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0115] Those skilled in the art will understand that Figure 11 The device structure shown does not constitute a limitation on the controller 200 and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0116] exist Figure 11 In the controller 200 shown, the processor 210 can be used to call the control program stored in the memory 220, thereby implementing the control method of the photovoltaic control circuit described above. Specifically, the non-transient software program and instructions required to implement the control method of the photovoltaic control circuit in the above embodiment are stored in the memory 220. When executed by the processor 210, the control method of the photovoltaic control circuit in the above embodiment is executed.

[0117] It is worth noting that, since the controller 200 of this application embodiment can execute the control method of the photovoltaic control circuit of any of the above embodiments, the specific implementation method and technical effect of the controller 200 of this application embodiment can refer to the specific implementation method and technical effect of the control method of the photovoltaic control circuit of any of the above embodiments.

[0118] Furthermore, one embodiment of this application also provides a photovoltaic control circuit, which includes the controller described in the above embodiment.

[0119] It is worth noting that, since the photovoltaic control circuit of this application embodiment includes the controller of the above embodiments, and the controller of the above embodiments can execute the control method of the photovoltaic control circuit of any of the above embodiments, the specific implementation method and technical effect of the photovoltaic control circuit of this application embodiment can refer to the specific implementation method and technical effect of the control method of the photovoltaic control circuit of any of the above embodiments.

[0120] Furthermore, one embodiment of this application also provides a photovoltaic energy storage system, which includes the photovoltaic control circuit described in the above embodiment.

[0121] It is worth noting that, since the photovoltaic energy storage system of this application embodiment includes the photovoltaic control circuit of the above embodiment, and the photovoltaic control circuit of the above embodiment includes the controller of the above embodiment, and the controller of the above embodiment can execute the control method of the photovoltaic control circuit of any of the above embodiments, the specific implementation method and technical effect of the photovoltaic energy storage system of this application embodiment can refer to the specific implementation method and technical effect of the control method of the photovoltaic control circuit of any of the above embodiments.

[0122] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for executing the control method of the photovoltaic control circuit described above. Exemplarily, the above-described... Figures 4 to 10 The methods and steps in the text.

[0123] It is worth noting that, since the computer-readable storage medium of this application embodiment can execute the control method of the photovoltaic control circuit of any of the above embodiments, the specific implementation and technical effects of the computer-readable storage medium of this application embodiment can be referred to the specific implementation and technical effects of the control method of the photovoltaic control circuit of any of the above embodiments.

[0124] Furthermore, one embodiment of this application also provides a computer program product, including a computer program or computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium and executes the computer program or computer instructions, causing the computer device to perform the control method of the photovoltaic control circuit described above. Exemplarily, the above-described method is executed... Figures 4 to 10 The methods and steps in the text.

[0125] It is worth noting that, since the computer program product of this application embodiment can execute the control method of the photovoltaic control circuit of any of the above embodiments, the specific implementation method and technical effect of the computer program product of this application embodiment can refer to the specific implementation method and technical effect of the control method of the photovoltaic control circuit of any of the above embodiments.

[0126] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0127] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0128] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0129] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0130] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A control method for a photovoltaic control circuit, characterized in that, The photovoltaic control circuit includes a photovoltaic input power supply, a boost converter module, and a bypass switch. The photovoltaic input power supply is connected to a DC bus through the boost converter module, and the bypass switch is connected between the photovoltaic input power supply and the DC bus. The method includes: Obtain the photovoltaic voltage and photovoltaic current of the photovoltaic input power supply; The switching state of the switching transistor in the boost converter module is controlled according to the photovoltaic voltage; When the switching transistor is in the off state, the switching state of the bypass switch is controlled according to the photovoltaic current.

2. The method according to claim 1, characterized in that, The boost converter module includes an inductor, a diode, and a switching transistor. The photovoltaic input power supply is connected to the DC bus through the inductor and the diode. The input terminal of the switching transistor is connected between the inductor and the diode. Controlling the switching state of the switching transistor in the boost converter module according to the photovoltaic voltage includes at least one of the following: When the photovoltaic voltage is greater than or equal to the given bus voltage, the switching transistor is turned off so that the photovoltaic voltage of the photovoltaic input power supply is supplied to the DC bus through the inductor and the diode; When the photovoltaic voltage is less than the given bus voltage, the switching state of the switching transistor is adjusted based on the duty cycle to boost the photovoltaic voltage of the photovoltaic input power supply and supply it to the DC bus.

3. The method according to claim 1, characterized in that, One of the photovoltaic input power supplies is connected to one of the boost converter modules; controlling the switching state of the bypass switch according to the photovoltaic current includes at least one of the following: When the photovoltaic current exceeds a preset current threshold, the bypass switch is closed; When the photovoltaic current is less than or equal to the preset current threshold, the bypass switch remains open.

4. The method according to claim 1, characterized in that, The number of boost converter modules and bypass switches are both multiple, with multiple boost converter modules connected in parallel, and one photovoltaic input power supply corresponding to multiple boost converter modules; the step of controlling the switching state of the bypass switch according to the photovoltaic current includes: For each of the boost converter modules, when the photovoltaic current is greater than a preset current threshold, the switching state of the bypass switch is controlled according to the switching state of the switching transistor in at least one other boost converter module.

5. The method according to claim 4, characterized in that, The step of controlling the switching state of the bypass switch based on the switching state of the switching transistors in at least one of the remaining boost converter modules includes at least one of the following: When the switching transistor in at least one of the remaining boost converter modules is in the off state, the bypass switch is closed; When the switching transistor in at least one of the remaining boost converter modules is in the ON state, the bypass switch remains OFF.

6. The method according to claim 4, characterized in that, The method of controlling the switching state of the bypass switch based on the photovoltaic current further includes: For each of the boost converter modules, when the photovoltaic current is less than or equal to the preset current threshold, the bypass switch is kept open.

7. A photovoltaic control circuit, characterized in that, A control method for executing a photovoltaic control circuit according to any one of claims 1 to 6, wherein the photovoltaic control circuit includes a photovoltaic input power supply, a boost converter module, and a bypass switch, wherein the photovoltaic input power supply is connected to a DC bus through the boost converter module, and the bypass switch is connected between the photovoltaic input power supply and the DC bus.

8. The photovoltaic control circuit according to claim 7, characterized in that, The boost converter module includes an inductor, a diode, and a switching transistor. The photovoltaic input power supply is connected to the DC bus through the inductor and the diode, and the input terminal of the switching transistor is connected between the inductor and the diode.

9. The photovoltaic control circuit according to claim 7, characterized in that, The number of the photovoltaic input power supply, the boost converter module, and the bypass switch is at least one, and one photovoltaic input power supply is connected to one boost converter module and one bypass switch.

10. The photovoltaic control circuit according to claim 7, characterized in that, The number of boost converter modules and bypass switches are both multiple, and the multiple boost converter modules are connected in parallel. One photovoltaic input power supply is connected to multiple boost converter modules and multiple bypass switches.

11. A photovoltaic energy storage system, characterized in that, Includes the photovoltaic control circuit as described in any one of claims 7 to 10.

12. A controller, characterized in that, include: The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the photovoltaic control circuit as described in any one of claims 1 to 6 when running the computer program.

13. A computer-readable storage medium, characterized in that: The device stores computer-executable instructions for performing a control method for a photovoltaic control circuit as described in any one of claims 1 to 6.

14. A computer program product, comprising a computer program or computer instructions, characterized in that, The computer program or the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer program or the computer instructions from the computer-readable storage medium and executes the computer program or the computer instructions, causing the computer device to perform the control method of the photovoltaic control circuit as described in any one of claims 1 to 6.

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