Energy storage converter, control method of energy storage converter, photovoltaic inverter and control method of photovoltaic inverter

Abstract

The invention discloses an energy storage converter and a control method thereof, and a photovoltaic inverter and a control method thereof, the control method of the energy storage converter is applied to a photovoltaic energy storage inverter system, the photovoltaic energy storage inverter system comprises an energy storage converter, a photovoltaic inverter and a scheduling control unit, the energy storage converter is provided with a starting switch, and the photovoltaic inverter is connected with the energy storage converter. The method comprises the following steps: when the photovoltaic energy storage inverter system is powered on and it is detected that the turn-on duration of a start switch satisfies a first preset duration, sending a first start instruction to a scheduling control unit, so that the scheduling control unit generates a second start instruction according to the first start instruction, a second starting instruction is sent to the photovoltaic inverter and the energy storage converter, so that the photovoltaic inverter is started according to the second starting instruction; and when the second starting instruction is received, the first starting instruction is stopped from being sent to the scheduling control unit, starting control is performed on the energy storage converter, and starting control of the photovoltaic energy storage inverter system is realized through the starting switch.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to an energy storage converter and its control method, and a photovoltaic inverter and its control method. Background Technology

[0002] In related technologies, residential photovoltaic (PV) energy storage inverter systems separate the energy storage system and the PV inverter system in terms of structure and topology. They achieve the functions of both PV inverters and hybrid inverters through flexible assembly; that is, the entire control system is in standby mode as long as any input port of the grid, PV modules, or batteries is powered on. Control system startup is achieved either by setting up a display screen and its associated buttons within the PV inverter system, or by connecting to a host computer or other smart devices. Both of these startup methods are relatively complex in terms of connection methods, and most of the associated buttons are redundant, increasing costs. Therefore, both startup methods are quite complex. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for an energy storage inverter that eliminates the need for terminal equipment and display screens. It achieves startup control of the photovoltaic energy storage inverter system through a start-up switch located on the energy storage inverter, thus simplifying the startup control of the photovoltaic energy storage inverter system.

[0004] The second objective of this invention is to provide a control method for a photovoltaic inverter.

[0005] A third objective of this invention is to provide a computer-readable storage medium.

[0006] The fourth objective of this invention is to provide an energy storage converter.

[0007] The fifth objective of this invention is to provide a photovoltaic inverter.

[0008] The sixth objective of this invention is to provide a photovoltaic energy storage inverter system.

[0009] To achieve the above objectives, a control method for an energy storage inverter is proposed according to a first aspect of the present invention, applied to a photovoltaic energy storage inverter system. The photovoltaic energy storage inverter system includes an energy storage inverter, a photovoltaic inverter, and a dispatch control unit. The energy storage inverter is equipped with a start switch. The method includes: when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet a first preset time, sending a first start command to the dispatch control unit, so that the dispatch control unit generates a second start command according to the first start command, and sends the second start command to the photovoltaic inverter and the energy storage inverter respectively, so that the photovoltaic inverter starts according to the second start command; upon receiving the second start command, stopping the sending of the first start command to the dispatch control unit, and performing start control on the energy storage inverter.

[0010] According to the control method of the energy storage inverter of the present invention, when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet a first preset time, a first start command is sent to the scheduling control unit. The scheduling control unit then generates a second start command based on the first start command and sends the second start command to both the photovoltaic inverter and the energy storage inverter, respectively, so that the photovoltaic inverter starts according to the second start command. Upon receiving the second start command, the method stops sending the first start command to the scheduling control unit and performs start control on the energy storage inverter. The energy storage inverter is equipped with a start switch. Thus, when the on-time of the start switch meets the first preset time, the energy storage inverter sends the first start command to the scheduling control unit. The scheduling control unit generates the second start command based on the first start command and sends the second start command to both the energy storage inverter and the photovoltaic inverter. Upon receiving the second start command, the energy storage inverter and the photovoltaic inverter perform start control. The start control of the photovoltaic energy storage inverter system is achieved solely through the start switch, without relying on terminal equipment and a display screen, making the start control of the photovoltaic energy storage inverter system simpler.

[0011] According to one embodiment of the present invention, the energy storage inverter is adapted to connect to a battery cell. When the photovoltaic energy storage inverter system is not powered on, the method further includes: when the energy storage inverter receives electrical energy provided by the battery cell and detects that the on-time of the start switch meets a first preset duration condition, obtaining the current remaining charge of the battery cell; when the current remaining charge is greater than the minimum start-up charge, controlling the energy storage inverter to boost the output voltage of the battery cell to power on the photovoltaic energy storage inverter system, and sending a first start-up command to the scheduling control unit.

[0012] According to one embodiment of the present invention, the battery unit is connected to a start switch, and the battery unit provides power to the energy storage converter when the start switch is turned on for a duration that meets a second preset duration.

[0013] According to one embodiment of the present invention, after sending a first start command to the scheduling control unit, the method further includes: if no second start command is received and the operation continues for a third preset duration, controlling the energy storage converter to stop working.

[0014] According to one embodiment of the present invention, after the energy storage converter is started, the method further includes: sending a first completion message to the scheduling control unit when the energy storage converter has completed the start-up.

[0015] According to one embodiment of the present invention, after starting the energy storage converter, the method further includes: controlling the energy storage converter to stop working upon receiving a first stop command sent by the scheduling control unit, wherein the first stop command is generated by the scheduling control unit when it has not received a first completion information and / or a second completion information sent by the photovoltaic inverter, and the photovoltaic inverter generates the second completion information upon completing the startup.

[0016] According to an embodiment of the present invention, after the start-up control of the energy storage converter is performed, the method further includes: when it is detected that the on-time of the start-up switch is greater than a fourth preset time, controlling the energy storage converter to stop working and sending a second stop command to the scheduling control unit, so that the scheduling control unit generates a third stop command according to the second stop command and sends a third stop command to the photovoltaic inverter, so that the photovoltaic inverter stops working according to the third stop command, wherein the fourth preset time is greater than the first preset time.

[0017] To achieve the above objectives, a control method for a photovoltaic inverter is proposed according to a second aspect of the present invention, applied to a photovoltaic energy storage inverter system. The photovoltaic energy storage inverter system includes an energy storage converter, a photovoltaic inverter, and a dispatch control unit. The energy storage converter is equipped with a start switch. The method includes: upon receiving a second start command sent by the dispatch control unit, performing start control on the photovoltaic inverter, wherein the second start command is generated by the dispatch control unit based on a first start command sent by the energy storage converter. The first start command is generated by the energy storage converter when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet a first preset time. Upon receiving the second start command, the energy storage converter stops sending the first start command and performs start control.

[0018] According to the control method of the photovoltaic inverter of the present invention, upon receiving a second start command, the photovoltaic inverter is started. The second start command is generated by the scheduling control unit based on a first start command sent by the energy storage converter. The first start command is generated by the energy storage converter when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet a first preset time. The energy storage converter is equipped with a start switch. Therefore, when the on-time of the start switch meets the first preset time, the energy storage converter sends the first start command to the scheduling control unit. The scheduling control unit generates a second start command based on the first start command and sends the second start command to both the energy storage converter and the photovoltaic inverter. Upon receiving the second start command, both the energy storage converter and the photovoltaic inverter perform start control. The start control of the photovoltaic energy storage inverter system is achieved solely through the start switch, eliminating the need for terminal equipment and a display screen, thus simplifying the start control of the photovoltaic energy storage inverter system.

[0019] According to one embodiment of the present invention, a photovoltaic inverter is suitable for connecting a power grid and a photovoltaic module, wherein the method further includes: upon receiving a third start command sent by a dispatch control unit, obtaining the open-circuit voltage of the photovoltaic module; and when the power grid is operating normally and the open-circuit voltage is greater than a preset start voltage, performing start control on the photovoltaic inverter, wherein the third start command is generated by the dispatch control unit when the photovoltaic energy storage inverter system is powered on and no first start command has been received.

[0020] According to one embodiment of the present invention, after the photovoltaic inverter is started, the method further includes: acquiring the output voltage of the photovoltaic module; and controlling the photovoltaic inverter to stop working when the output voltage of the photovoltaic module is less than a preset stop voltage or when the power grid is abnormal.

[0021] According to one embodiment of the present invention, after performing startup control on the photovoltaic inverter, the method further includes: sending a second completion message to the scheduling control unit when the photovoltaic inverter has completed startup.

[0022] According to an embodiment of the present invention, after the photovoltaic inverter is started, the method further includes: controlling the photovoltaic inverter to stop working upon receiving a first stop command sent by the scheduling control unit, wherein the first stop command is generated by the scheduling control unit when it has not received first completion information and / or second completion information sent by the photovoltaic inverter, and the energy storage converter generates the first completion information upon completion of startup.

[0023] According to an embodiment of the present invention, after the photovoltaic inverter is started, the method further includes: upon receiving a third stop command sent by the scheduling control unit, controlling the photovoltaic inverter to stop working, wherein the third stop command is generated by the scheduling control unit based on a second stop command sent by the energy storage converter, the second stop command is generated after the energy storage converter is started and the on-time of the start switch is detected to be greater than a fourth preset time, the fourth preset time being greater than a first preset time.

[0024] To achieve the above objectives, a computer-readable storage medium is provided according to a third aspect of the present invention, having stored thereon a computer program that, when executed by a processor, implements the control method of the energy storage converter or the control method of the photovoltaic inverter of any of the foregoing embodiments.

[0025] According to the computer-readable storage medium of the present invention, by executing the computer program of the above-described control method for energy storage inverter or control method for photovoltaic inverter, the start-up control of the photovoltaic energy storage inverter system is realized by setting a start-up switch on the energy storage inverter without relying on terminal equipment and display screen, making the start-up control of the photovoltaic energy storage inverter system simpler.

[0026] To achieve the above objectives, a fourth aspect of the present invention provides an energy storage converter, comprising: a memory, a processor, and a control program for the energy storage converter stored in the memory and executable on the processor. When the processor executes the control program for the energy storage converter, it implements the control method for the energy storage converter of any of the foregoing embodiments.

[0027] According to the energy storage inverter of the present invention, the computer program of the above-described energy storage inverter control method is executed by the processor. It does not rely on terminal equipment and display screen. The start-up control of the photovoltaic energy storage inverter system is realized by the start-up switch set in the energy storage inverter, which makes the start-up control of the photovoltaic energy storage inverter system simpler.

[0028] To achieve the above objectives, a photovoltaic inverter is provided according to a fifth aspect embodiment of the present invention, comprising: a memory, a processor, and a control program for the photovoltaic inverter stored in the memory and executable on the processor. When the processor executes the control program for the photovoltaic inverter, it implements the control method for the photovoltaic inverter of any of the foregoing embodiments.

[0029] According to the photovoltaic inverter of the present invention, the computer program of the photovoltaic inverter control method described above is executed by the processor. It does not rely on terminal equipment and display screen. The start-up control of the photovoltaic energy storage inverter system is realized by the start-up switch set in the energy storage converter, which makes the start-up control of the photovoltaic energy storage inverter system simpler.

[0030] To achieve the above objectives, a photovoltaic energy storage inverter system is provided according to a sixth aspect of the present invention, comprising: an energy storage converter, a photovoltaic inverter, and a dispatch control unit. The energy storage converter is equipped with a start switch and is configured to send a first start command to the dispatch control unit when the photovoltaic energy storage inverter system is powered on and the start switch is detected to have been open for a first preset duration. Upon receiving a second start command from the dispatch control unit, the energy storage converter stops sending the first start command and performs start control on the energy storage converter. The dispatch control unit is configured to generate a second start command based on the first start command and send the second start command to both the photovoltaic inverter and the energy storage converter. The photovoltaic inverter is configured to perform start control on the photovoltaic inverter upon receiving the second start command from the dispatch control unit.

[0031] According to an embodiment of the photovoltaic energy storage inverter system of the present invention, the energy storage converter is equipped with a start switch. When the photovoltaic energy storage inverter system is powered on and the start switch is detected to have been open for a first preset duration, the energy storage converter sends a first start command to the scheduling control unit. The scheduling control unit generates a second start command based on the first start command and sends the second start command to both the photovoltaic inverter and the energy storage converter. When the photovoltaic inverter starts upon receiving the second start command, the system performs start control on the photovoltaic inverter. When the energy storage converter receives the second start command, it stops sending the first start command to the scheduling control unit and stops performing start control on the energy storage converter. Therefore, when the on-time of the start switch meets the first preset time, the energy storage converter sends a first start command to the dispatch control unit. The dispatch control unit generates a second start command based on the first start command and sends the second start command to the energy storage converter and the photovoltaic inverter respectively. After receiving the second start command, the energy storage converter and the photovoltaic inverter perform start control. The start control of the photovoltaic energy storage inverter system is realized only through the start switch, without relying on terminal equipment and display screen, making the start control of the photovoltaic energy storage inverter system simpler.

[0032] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a residential photovoltaic energy storage inverter system according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of a photovoltaic energy storage inverter system according to an embodiment of the present invention;

[0035] Figure 3 This is a flowchart illustrating a control method for an energy storage converter according to an embodiment of the present invention;

[0036] Figure 4 This is a flowchart illustrating a method for starting a photovoltaic energy storage inverter system when the power grid and photovoltaic modules are not powered, according to an embodiment of the present invention.

[0037] Figure 5 This is a flowchart illustrating a method for starting a photovoltaic energy storage inverter system when the power grid or photovoltaic modules are powered on, according to an embodiment of the present invention.

[0038] Figure 6 This is a flowchart illustrating a control method for a photovoltaic inverter according to an embodiment of the present invention;

[0039] Figure 7 This is a flowchart illustrating a control method for a scheduling control unit according to an embodiment of the present invention;

[0040] Figure 8 This is a flowchart illustrating a method for starting up a photovoltaic inverter when there is no energy storage system in the photovoltaic energy storage inverter system, according to an embodiment of the present invention.

[0041] Figure 9 This is a system schematic diagram of an energy storage converter according to an embodiment of the present invention;

[0042] Figure 10 This is a system schematic diagram of a photovoltaic inverter according to an embodiment of the present invention. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] The following description, with reference to the accompanying drawings, describes an energy storage converter and its control method, a photovoltaic inverter and its control method, a storage medium, and a photovoltaic energy storage inverter system according to embodiments of the present invention.

[0045] Figure 1 This is a schematic diagram of a residential photovoltaic energy storage inverter system according to an embodiment of the present invention. The residential photovoltaic energy storage inverter system includes an energy storage system and a photovoltaic inverter system. The energy storage system includes a low-voltage battery 410, a BMS (Battery Management System) for the low-voltage battery 410, and an energy storage inverter 100. The energy storage inverter 100 is equipped with a start switch 10. The photovoltaic inverter 200 includes a photovoltaic power conversion unit and an inverter unit.

[0046] Figure 2 This is a schematic diagram of a photovoltaic energy storage inverter system according to an embodiment of the present invention. The photovoltaic energy storage inverter system includes an energy storage converter 100, a photovoltaic inverter 200, and a dispatch control unit 300. The energy storage inverter 100 includes a first boost circuit 20, a second boost circuit 30, and a first control device 40. The input of the first boost circuit 20 is adapted to connect to a battery unit 400, which includes a low-voltage battery 410 and a BMS. The second boost circuit 30 is connected to the first boost circuit 20, and its output is adapted to connect to a DC bus. The first control device 40 controls the first boost circuit 20 and the second boost circuit 30. The input of the photovoltaic power conversion unit 50 is adapted to connect to a photovoltaic module 500, and the input of the inverter unit 60 is adapted to connect to the power grid 600. The outputs of both the photovoltaic power conversion unit 50 and the inverter unit 60 are adapted to connect to a DC bus. The photovoltaic inverter 200 also includes a second control device 70, which controls the photovoltaic power conversion unit 50 and the inverter unit 60. The first control device 40 and the second control device 70 achieve information interaction and energy dispatch control of the photovoltaic energy storage inverter system through the dispatch control unit 300.

[0047] It should be noted that the first control device 40, the second control device 70, and the scheduling control unit 300 can be DSP (Digital Signal Processing) chips, but are not limited to DSP chips; they can also be other control chips.

[0048] The control method for the energy storage converter 100 in this embodiment is applied to the first control device 40, which controls the first boost circuit 20 and the second boost circuit 30 according to the second start command. The control method for the photovoltaic inverter 200 in this embodiment is applied to the second control device 70, which controls the photovoltaic power conversion unit 50 and the inverter unit 60 according to the second start command.

[0049] Figure 3 This is a flowchart illustrating a control method for an energy storage converter according to an embodiment of the present invention. Figure 3 As shown, the control method for the energy storage converter includes:

[0050] S101, when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet the first preset time, a first start command is sent to the dispatch control unit so that the dispatch control unit can generate a second start command according to the first start command and send the second start command to the photovoltaic inverter and the energy storage converter respectively, so that the photovoltaic inverter can start according to the second start command.

[0051] Specifically, when the photovoltaic energy storage inverter system is powered on, the grid, photovoltaic modules, and any one of the battery input ports are powered on. At this time, there is a bus voltage on the DC bus, and the first control device, the second control device, and the dispatch control unit are powered on. The first control device and the dispatch control unit establish communication, and the second control device and the dispatch control unit establish communication. If the start switch is pressed and held for a period of time, such that the start switch is on for a first preset duration, the first control device continuously sends a first start command to the dispatch control unit. Upon receiving the first start command, the dispatch control unit generates a second start command based on the first start command and sends the second start command to both the first and second control devices. Upon receiving the second start command, the second control device initiates start-up control of the photovoltaic inverter.

[0052] S102, upon receiving the second start command, stops sending the first start command to the dispatch control unit and performs start control on the energy storage converter.

[0053] Specifically, upon receiving the second start command, the first control device stops sending the first start command to the scheduling control unit and simultaneously performs start control on the energy storage inverter, thereby enabling the entire photovoltaic energy storage inverter system to start.

[0054] In the above embodiment, when the photovoltaic energy storage inverter system is powered on, by pressing and holding the start switch until the start switch is open for a first preset duration, the energy storage inverter sends a first start command to the scheduling control unit. The scheduling control unit then sends second start commands to both the energy storage inverter and the photovoltaic inverter. Upon receiving the second start command, the energy storage inverter and the photovoltaic inverter perform start control, thus enabling start control of the photovoltaic energy storage inverter system solely through the start switch, making the start control of the photovoltaic energy storage inverter system simpler.

[0055] In some embodiments, such as Figure 2 As shown, the energy storage inverter 100 is adapted to connect to the battery unit 400. When the photovoltaic energy storage inverter system is not powered on, the method further includes: when the energy storage inverter receives electrical energy provided by the battery unit and detects that the on-time of the start switch meets a first preset time condition, obtaining the current remaining power of the battery unit; when the current remaining power is greater than the minimum start-up power, controlling the energy storage inverter to boost the output voltage of the battery unit to power on the photovoltaic energy storage inverter system, and sending a first start command to the scheduling control unit.

[0056] Specifically, when the grid and photovoltaic modules are not powered on, the photovoltaic energy storage inverter system needs to rely on the energy storage converter to start first, with the DC bus voltage recommended. After the low-voltage battery is activated, it supplies power to the energy storage converter, the first control device is powered on, and communication is established with the BMS. At this time, the start switch is pressed and held to ensure that the start switch is open for a first preset time. The first control device obtains the current remaining power of the low-voltage battery through the BMS. If the current remaining power is greater than the minimum start power, it indicates that the photovoltaic energy storage inverter system meets the start conditions. The first control device controls the first boost circuit and the second boost circuit to boost the output voltage of the battery unit to establish the DC bus voltage, thereby powering on the photovoltaic energy storage inverter system and the dispatch control unit. At the same time, the first start command is sent to the dispatch control unit, which then generates a second start command and sends the second start command to the energy storage converter and the photovoltaic inverter, realizing the off-grid start of the photovoltaic energy storage inverter system and the output voltage of the off-grid load port. If the current remaining power is less than or equal to the minimum starting power, it indicates that the photovoltaic energy storage inverter system does not meet the starting conditions. Therefore, the energy storage inverter is controlled to stop working.

[0057] In one optional implementation, after the dispatch control unit is powered on, the dispatch control unit detects the current devices of the photovoltaic energy storage inverter system. If the current devices are different from the preset device list, it indicates that the device self-test has failed. Therefore, a fourth stop command is sent to the energy storage converter and the photovoltaic inverter. Upon receiving the fourth stop command, the energy storage converter and the photovoltaic inverter stop working.

[0058] In some embodiments, the battery unit is connected to a start switch, and the battery unit provides power to the energy storage converter when the start switch is on for a duration that meets a second preset duration.

[0059] Specifically, the battery cell's BMS is connected to the start switch to detect its operation. When the grid and photovoltaic modules are not powered, pressing and holding the start switch for a predetermined duration activates the low-voltage battery via dry contacts. If the low-voltage battery fails to activate, it indicates that its charge is depleted and the photovoltaic energy storage inverter system cannot be started. If the low-voltage battery is activated, it supplies power to the energy storage inverter.

[0060] In one alternative implementation, the first preset duration is longer than the second preset duration.

[0061] It should be noted that the BMS and the first control device can perform action detection on the start switch separately. When the first control device is not powered, the BMS performs action detection on the start switch. When the first control device is powered, the first control device performs action detection on the start switch.

[0062] In the above embodiment, when the grid and photovoltaic modules are not powered on, the start switch is pressed and held for a second preset duration, so that the low-voltage battery supplies power to the energy storage inverter. When the photovoltaic energy storage inverter system is determined to meet the start-up conditions based on the current remaining power, the energy storage inverter is controlled to boost the voltage so that the photovoltaic energy storage inverter system is powered on. Then, the energy storage inverter and photovoltaic inverter are controlled to start. The off-grid start-up of the photovoltaic energy storage inverter system is realized through the start switch.

[0063] In some embodiments, after sending a first start command to the scheduling control unit, the method further includes: if no second start command is received and the operation continues for a third preset duration, controlling the energy storage converter to stop working.

[0064] Understandably, if the energy storage inverter does not receive the second start command for a continuous third preset duration, and the energy storage inverter continues to send the first start command to the dispatch control unit for a continuous third preset duration, it indicates that there is a problem with the system power line of the photovoltaic energy storage inverter system, causing the dispatch control unit to be de-energized, or there is a problem with the communication line connection between the dispatch control unit and the energy storage inverter, causing the dispatch control unit to be unable to receive the first start command. Therefore, the photovoltaic energy storage inverter system malfunctions, and the control energy storage inverter stops working.

[0065] In some embodiments, after controlling the start-up of the energy storage converter, the method further includes: sending a first completion message to the scheduling control unit when the energy storage converter has completed the start-up.

[0066] In other words, after the energy storage converter completes its startup, it sends a first completion message to the dispatch control unit. The dispatch control unit can then determine whether the energy storage converter has successfully started up based on whether it receives the first completion message, so as to perform subsequent control.

[0067] In some embodiments, after starting the energy storage converter, the method further includes: controlling the energy storage converter to stop working upon receiving a first stop command sent by the scheduling control unit, wherein the first stop command is generated by the scheduling control unit when it has not received a first completion information and / or a second completion information sent by the photovoltaic inverter, and the photovoltaic inverter generates the second completion information upon completing the startup.

[0068] Specifically, when the dispatch control unit does not receive the first completion information and / or the second completion information sent by the photovoltaic inverter, it indicates that the energy storage converter or the photovoltaic inverter has not completed the startup. Therefore, the dispatch control unit sends a first stop command to the energy storage converter and the photovoltaic inverter respectively, so as to stop the energy storage converter and the photovoltaic inverter from working.

[0069] In the above embodiments, after the energy storage converter and the photovoltaic inverter complete the startup, they send a completion message to the scheduling control unit. If the energy storage converter and / or the photovoltaic inverter have not completed the startup, the scheduling control unit generates a first stop command to stop the energy storage converter and the photovoltaic inverter from working, thereby avoiding damage to the photovoltaic energy storage inverter system and improving the safety of the photovoltaic energy storage inverter system.

[0070] In some embodiments, after starting the energy storage converter, the method further includes: if the on-time of the start-up switch is detected to be longer than a fourth preset time, controlling the energy storage converter to stop working and sending a second stop command to the scheduling control unit, so that the scheduling control unit generates a third stop command according to the second stop command and sends a third stop command to the photovoltaic inverter, so that the photovoltaic inverter stops working according to the third stop command, wherein the fourth preset time is longer than the first preset time.

[0071] Specifically, when the start switch is pressed and held for a period of time until the start switch is on for a fourth preset duration, the energy storage converter is controlled to stop working and a second stop command is sent to the dispatch control unit. After receiving the second stop command, the dispatch control unit sends a third stop command to the photovoltaic inverter. After receiving the third stop command, the photovoltaic inverter is controlled to stop working.

[0072] In the above embodiments, the photovoltaic energy storage inverter system can also be shut down by starting the switch, thus realizing the start-up and stop control of the photovoltaic energy storage inverter system.

[0073] The technical solution of this application is further described in detail below with reference to specific implementation methods:

[0074] like Figure 4 As shown, the startup method of the photovoltaic energy storage inverter system when the grid and photovoltaic modules are not powered includes the following steps:

[0075] S301, the BMS detects the operation of the start switch.

[0076] S302, the BMS determines whether the on-time of the start switch has reached the second preset time. If the on-time of the start switch has reached the second preset time, then proceed to step S303. If the on-time of the start switch has not reached the second preset time, then return to step S301.

[0077] S303, the low-voltage battery supplies power to the energy storage converter.

[0078] S304, the energy storage converter detects the operation of the start switch.

[0079] S305, the energy storage converter determines whether the start-up switch has reached the first preset duration. If the start-up switch has reached the first preset duration, then proceed to step S306. If the start-up switch has not reached the first preset duration, then proceed to step S311.

[0080] S306, the energy storage converter obtains the current remaining power of the battery cell.

[0081] S307, the energy storage converter determines whether the current remaining power is greater than the minimum starting power. If the current remaining power is greater than the minimum starting power, then proceed to step S308. If the current remaining power is less than or equal to the minimum starting power, then proceed to step S311.

[0082] S308, the energy storage converter boosts the output voltage of the battery cell and sends the first start command to the dispatch control unit.

[0083] S309, the scheduling control unit determines whether the first start command has not been received for more than a third preset time. If the scheduling control unit determines that the first start command has not been received for more than a third preset time, then step S310 is executed. If the scheduling control unit determines that the first start command has not been received for more than a third preset time, then step S311 is executed.

[0084] S310, the dispatch control unit sends a second start command to the energy storage converter and the photovoltaic inverter respectively, so as to start the energy storage converter and the photovoltaic inverter.

[0085] S311, the energy storage converter stops starting.

[0086] In the above embodiment, when the grid and photovoltaic modules are not powered on, the start switch is pressed and held for a second preset duration, so that the low-voltage battery supplies power to the energy storage inverter. When the photovoltaic energy storage inverter system is determined to meet the start-up conditions based on the current remaining power, the photovoltaic energy storage inverter system is powered on, and then the energy storage inverter and photovoltaic inverter are started. Off-grid start-up of the photovoltaic energy storage inverter system is realized through the start switch.

[0087] like Figure 5 As shown, the startup method of a photovoltaic energy storage inverter system when the grid or photovoltaic modules are powered on includes the following steps:

[0088] S401, the energy storage converter detects the operation of the start switch.

[0089] S402, the energy storage converter determines whether the on-time of the start switch has reached the first preset time. If the on-time of the start switch has reached the first preset time, then step S403 is executed. If the on-time of the start switch has not reached the first preset time, then step S406 is executed.

[0090] S403 sends the first start command to the scheduling control unit.

[0091] S404, the scheduling control unit determines whether the first start command has not been received within the third preset time period. If the scheduling control unit determines that the first start command has not been received within the third preset time period, then step S405 is executed. If the scheduling control unit determines that the first start command has not been received within the third preset time period, then step S406 is executed.

[0092] S405, the dispatch control unit sends a second start command to the energy storage converter and the photovoltaic inverter respectively, so as to start the energy storage converter and the photovoltaic inverter.

[0093] S406, the energy storage converter and photovoltaic inverter stop starting.

[0094] In the above embodiment, when the photovoltaic energy storage inverter system is powered on, by pressing and holding the start switch until the start switch is open for a first preset duration, the energy storage inverter sends a first start command to the scheduling control unit. The scheduling control unit sends a second start command to both the energy storage inverter and the photovoltaic inverter. After receiving the second start command, the energy storage inverter and the photovoltaic inverter perform start control, thus realizing start control of the photovoltaic energy storage inverter system solely through the start switch.

[0095] In summary, the control method for the energy storage inverter according to an embodiment of the present invention, when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet a first preset time, sends a first start command to the scheduling control unit. The scheduling control unit then generates a second start command based on the first start command and sends the second start command to both the photovoltaic inverter and the energy storage inverter, respectively, so that the photovoltaic inverter starts according to the second start command. Upon receiving the second start command, the method stops sending the first start command to the scheduling control unit and performs start control on the energy storage inverter. The energy storage inverter is equipped with a start switch. Therefore, when the on-time of the start switch meets the first preset time, the energy storage inverter sends the first start command to the scheduling control unit. The scheduling control unit generates the second start command based on the first start command and sends the second start command to both the energy storage inverter and the photovoltaic inverter. Upon receiving the second start command, the energy storage inverter and the photovoltaic inverter perform start control. The start control of the photovoltaic energy storage inverter system is achieved solely through the start switch, without relying on terminal equipment and a display screen, making the start control of the photovoltaic energy storage inverter system simpler.

[0096] Corresponding to the above embodiments, embodiments of the present invention also provide a control method for a photovoltaic inverter. For example... Figure 1 and Figure 2As shown, the control method for the photovoltaic inverter 200 is applied to a photovoltaic energy storage inverter system. The photovoltaic energy storage inverter system includes an energy storage converter 100, a photovoltaic inverter 200, and a dispatch control unit 300. The energy storage converter 100 is equipped with a start switch 10. Figure 6 As shown, the control method for photovoltaic inverters includes:

[0097] S501, upon receiving the second start command sent by the dispatch control unit, the photovoltaic inverter is started. The second start command is generated by the dispatch control unit based on the first start command sent by the energy storage converter. The first start command is generated by the energy storage converter when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet the first preset time. Upon receiving the second start command, the energy storage converter stops sending the first start command and starts starting.

[0098] Specifically, when the photovoltaic energy storage inverter system is powered on, the grid, photovoltaic modules, and any one of the battery input ports are powered on. At this time, there is a bus voltage on the DC bus, and the first control device, the second control device, and the dispatch control unit are powered on. The first control device and the dispatch control unit establish communication, and the second control device and the dispatch control unit establish communication. If the start switch is pressed and held for a period of time, such that the start switch is on for a first preset duration, the first control device continuously sends a first start command to the dispatch control unit. Upon receiving the first start command, the dispatch control unit generates a second start command based on the first start command and sends the second start command to both the first and second control devices. Upon receiving the second start command, the second control device initiates start-up control of the photovoltaic inverter.

[0099] In the above embodiment, when the photovoltaic energy storage inverter system is powered on, by pressing and holding the start switch until the start switch is open for a first preset duration, the energy storage inverter sends a first start command to the scheduling control unit. The scheduling control unit then sends second start commands to both the energy storage inverter and the photovoltaic inverter. Upon receiving the second start command, the energy storage inverter and the photovoltaic inverter perform start control, thus enabling start control of the photovoltaic energy storage inverter system solely through the start switch, making the start control of the photovoltaic energy storage inverter system simpler.

[0100] In some embodiments, such as Figure 2As shown, the photovoltaic inverter 200 is suitable for connecting the grid 500 and the photovoltaic module 600. The method further includes: obtaining the open-circuit voltage of the photovoltaic module when a third start command is received from the dispatch control unit; and performing start control on the photovoltaic inverter when the grid is operating normally and the open-circuit voltage is greater than the preset start voltage. The third start command is generated by the dispatch control unit when the photovoltaic energy storage inverter system is powered on and no first start command has been received.

[0101] Specifically, when the photovoltaic (PV) energy storage inverter system is powered on and the energy storage converter does not send a first start command to the dispatch control unit, it indicates that the PV energy storage inverter system does not have an energy storage function; the PV energy storage inverter system performs a PV inverter function, which connects PV power generation to the grid while keeping the system in standby mode when there is no PV (no sunlight), reducing standby power consumption. The dispatch control unit generates a third start command and sends it to the PV inverter. If the grid is operating normally and the open-circuit voltage is greater than the preset start voltage, it indicates that the output voltage of the PV modules can meet the needs of the PV energy storage inverter system, so the PV inverter is started to connect the PV modules to the grid. If the grid is abnormal and / or the open-circuit voltage is less than or equal to the preset start voltage, the PV inverter is controlled to stop working.

[0102] In the above embodiment, when the photovoltaic energy storage inverter system does not have an energy storage function, the scheduling control unit generates a third start command and sends it to the photovoltaic inverter so that the photovoltaic inverter can perform start control, thereby realizing the start of the photovoltaic inverter system.

[0103] In some embodiments, after controlling the start-up of the photovoltaic inverter, the method further includes: acquiring the output voltage of the photovoltaic module; and controlling the photovoltaic inverter to stop working when the output voltage of the photovoltaic module is less than a preset stop voltage or when the power grid is malfunctioning.

[0104] It is understandable that after the photovoltaic inverter starts up, if the output voltage of the photovoltaic module is less than the preset stop voltage, or the grid connection voltage / frequency is abnormal, it indicates that the photovoltaic module cannot meet the start-up conditions of the photovoltaic energy storage inverter system, or that there is an abnormality in the power grid. Therefore, the photovoltaic inverter is controlled to stop working.

[0105] In some embodiments, after controlling the startup of the photovoltaic inverter, the method further includes: sending a second completion message to the scheduling control unit when the photovoltaic inverter has completed startup.

[0106] In other words, after the photovoltaic inverter completes its startup, it sends a second completion message to the scheduling and control unit. The scheduling and control unit can then determine whether the photovoltaic inverter has successfully started up based on whether it receives the second completion message, so as to carry out subsequent control.

[0107] In some embodiments, after controlling the start-up of the photovoltaic inverter, the method further includes: controlling the photovoltaic inverter to stop working upon receiving a first stop command sent by the scheduling control unit, wherein the first stop command is generated by the scheduling control unit when it has not received first completion information and / or second completion information sent by the photovoltaic inverter, and the energy storage converter generates the first completion information upon completion of the start-up.

[0108] Specifically, when the dispatch control unit does not receive the first completion information and / or the second completion information sent by the photovoltaic inverter, it indicates that the energy storage converter or the photovoltaic inverter has not completed the startup. Therefore, the dispatch control unit sends a first stop command to the energy storage converter and the photovoltaic inverter respectively, so as to stop the energy storage converter and the photovoltaic inverter from working.

[0109] In the above embodiments, after the energy storage converter and the photovoltaic inverter complete the startup, they send a completion message to the scheduling control unit. If the energy storage converter and / or the photovoltaic inverter have not completed the startup, the scheduling control unit generates a first stop command to stop the energy storage converter and the photovoltaic inverter from working, thereby avoiding damage to the photovoltaic energy storage inverter system and improving the safety of the photovoltaic energy storage inverter system.

[0110] In some embodiments, after controlling the start-up of the photovoltaic inverter, the method further includes: upon receiving a third stop command sent by the scheduling control unit, controlling the photovoltaic inverter to stop working, wherein the third stop command is generated by the scheduling control unit based on a second stop command sent by the energy storage converter, the second stop command is generated after the energy storage converter starts up and when it is detected that the on-time of the start switch is greater than a fourth preset time, the fourth preset time being greater than a first preset time.

[0111] Specifically, when the start switch is pressed and held for a period of time until the start switch is on for a fourth preset duration, the energy storage converter is controlled to stop working and a second stop command is sent to the dispatch control unit. After receiving the second stop command, the dispatch control unit sends a third stop command to the photovoltaic inverter. After receiving the third stop command, the photovoltaic inverter is controlled to stop working.

[0112] In the above embodiments, the photovoltaic energy storage inverter system can also be shut down by starting the switch, thus realizing the start-up and stop control of the photovoltaic energy storage inverter system.

[0113] The technical solution of this application is further described in detail below with reference to specific implementation methods:

[0114] like Figure 7 As shown, the control method of the scheduling control unit includes the following steps:

[0115] S601 performs a test on the current equipment of the photovoltaic energy storage inverter system after the dispatch control unit is powered on.

[0116] S602, determine whether the current device is the same as the preset device list. If the current device is the same as the preset device list, proceed to step S603. If the current device is different from the preset device list, proceed to step S606.

[0117] S603, determine whether the first startup command has been received. If the first startup command has been received, proceed to step S604. If the first startup command has not been received, proceed to step S605.

[0118] S604 is used for startup control of photovoltaic inverters and energy storage converters.

[0119] S605 controls the startup of the photovoltaic inverter.

[0120] S606 indicates that the device self-test has failed and sends a fourth stop command to the energy storage converter and photovoltaic inverter to stop them from working.

[0121] In the above embodiments, the scheduling control unit controls the photovoltaic energy storage inverter system to perform different functions based on whether the first start command sent by the energy storage inverter is detected.

[0122] like Figure 8 As shown, when there is no energy storage system in the photovoltaic energy storage inverter system, the startup method of the photovoltaic inverter includes the following steps:

[0123] S701, upon receiving the third start command sent by the scheduling control unit, obtains the open-circuit voltage of the photovoltaic module.

[0124] S702, determine whether the power grid is working normally and whether the open circuit voltage is greater than the preset starting voltage. If the power grid is working normally and the open circuit voltage is greater than the preset starting voltage, then execute step S703. If the power grid is not working normally and / or the open circuit voltage is less than or equal to the preset starting voltage, then execute step S706.

[0125] S703 controls the startup of the photovoltaic inverter.

[0126] S704 obtains the output voltage of the photovoltaic module.

[0127] S705, determine whether the output voltage of the photovoltaic module is less than the preset stop voltage or whether the power grid is malfunctioning. If the output voltage of the photovoltaic module is less than the preset stop voltage or the power grid is malfunctioning, proceed to step S706. If the output voltage of the photovoltaic module is greater than or equal to the preset stop voltage and the power grid is functioning normally, return to step S704.

[0128] S706 controls the photovoltaic inverter to stop working.

[0129] In the above embodiments, when the photovoltaic energy storage inverter system does not have energy storage function, the scheduling control unit generates a third start command and sends it to the photovoltaic inverter to enable the photovoltaic inverter to start control. When the output voltage of the photovoltaic module cannot meet the requirements of the photovoltaic energy storage inverter system or the power grid is abnormal, the photovoltaic inverter is controlled to stop working, thereby realizing the start and stop of the photovoltaic inverter system.

[0130] In summary, the photovoltaic inverter control method according to an embodiment of the present invention performs startup control on the photovoltaic inverter upon receiving a second startup command. The second startup command is generated by the scheduling control unit based on a first startup command sent by the energy storage converter. The first startup command is generated by the energy storage converter when the photovoltaic energy storage inverter system is powered on and the on-time of the startup switch is detected to meet a first preset time. The energy storage converter is equipped with a startup switch. Therefore, when the on-time of the startup switch meets the first preset time, the energy storage converter sends the first startup command to the scheduling control unit. The scheduling control unit generates a second startup command based on the first startup command and sends the second startup command to both the energy storage converter and the photovoltaic inverter. Upon receiving the second startup command, both the energy storage converter and the photovoltaic inverter perform startup control. Startup control of the photovoltaic energy storage inverter system is achieved solely through the startup switch, eliminating the need for terminal equipment and a display screen, thus simplifying the startup control of the photovoltaic energy storage inverter system.

[0131] Corresponding to the above embodiments, embodiments of the present invention also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the control method of the energy storage converter or the control method of the photovoltaic inverter of any of the foregoing embodiments.

[0132] According to the computer-readable storage medium of the present invention, by executing the computer program of the above-described control method for energy storage inverter or control method for photovoltaic inverter, the start-up control of the photovoltaic energy storage inverter system is realized by setting a start-up switch on the energy storage inverter without relying on terminal equipment and display screen, making the start-up control of the photovoltaic energy storage inverter system simpler.

[0133] Corresponding to the above embodiments, embodiments of the present invention also provide an energy storage converter. For example... Figure 9 As shown, the energy storage converter 100 includes: a memory 110, a processor 120, and a control program for the energy storage converter stored in the memory 110 and executable on the processor 120. When the processor 120 executes the control program for the energy storage converter, it implements the control method for the energy storage converter of any of the aforementioned embodiments.

[0134] According to the energy storage inverter of the present invention, the computer program of the above-described energy storage inverter control method is executed by the processor. It does not rely on terminal equipment and display screen. The start-up control of the photovoltaic energy storage inverter system is realized by the start-up switch set in the energy storage inverter, which makes the start-up control of the photovoltaic energy storage inverter system simpler.

[0135] Corresponding to the above embodiments, embodiments of the present invention also provide a photovoltaic inverter. For example... Figure 10 As shown, the photovoltaic inverter 200 includes: a memory 210, a processor 220, and a control program for the photovoltaic inverter stored in the memory 210 and executable on the processor 220. When the processor 220 executes the control program for the photovoltaic inverter, it implements the control method for the photovoltaic inverter of any of the aforementioned embodiments.

[0136] According to the photovoltaic inverter of the present invention, the computer program of the photovoltaic inverter control method described above is executed by the processor. It does not rely on terminal equipment and display screen. The start-up control of the photovoltaic energy storage inverter system is realized by the start-up switch set in the energy storage converter, which makes the start-up control of the photovoltaic energy storage inverter system simpler.

[0137] Corresponding to the above embodiments, embodiments of the present invention also provide a photovoltaic energy storage inverter system. For example... Figure 2 As shown, the photovoltaic energy storage inverter system includes: an energy storage converter 100, a photovoltaic inverter 200, and a dispatch control unit 300.

[0138] The energy storage inverter 100 is equipped with a start switch 10. The energy storage inverter 100 is configured to send a first start command to the dispatch control unit 300 when the photovoltaic energy storage inverter system is powered on and the start switch 10 is detected to have been on for a first preset duration. Upon receiving a second start command from the dispatch control unit 300, the inverter 100 stops sending the first start command to the dispatch control unit 300 and performs start control on the energy storage inverter 100. The dispatch control unit 300 is configured to generate a second start command based on the first start command and send the second start command to both the photovoltaic inverter 200 and the energy storage inverter 100. The photovoltaic inverter 200 is configured to perform start control on the photovoltaic inverter 200 upon receiving the second start command from the dispatch control unit 300.

[0139] In some embodiments, the energy storage inverter 100 is adapted to connect to the battery unit 400. The energy storage inverter 100 is further configured to: when the photovoltaic energy storage inverter system is not powered on, when the energy storage inverter 100 receives electrical energy provided by the battery unit 400 and detects that the on-time of the start switch 10 meets a first preset time condition, obtain the current remaining power of the battery unit 400; when the current remaining power is greater than the minimum start-up power, control the energy storage inverter 100 to boost the output voltage of the battery unit 400 to power on the photovoltaic energy storage inverter system, and send a first start command to the scheduling control unit 300.

[0140] In some embodiments, the battery unit 400 is connected to the start switch 10, and the battery unit 400 provides power to the energy storage converter 100 when the start switch 10 is turned on for a period of time that meets a second preset duration.

[0141] In some embodiments, the energy storage converter 100 is further configured to: after sending a first start command to the scheduling control unit 300, if no second start command is received and the operation continues for a third preset duration, control the energy storage converter 100 to stop working.

[0142] In some embodiments, the energy storage converter 100 is further configured to send a first completion message to the scheduling control unit 300 after the energy storage converter 100 has been started, following the start-up control of the energy storage converter 100.

[0143] In some embodiments, the energy storage converter 100 is further configured to: after starting control of the energy storage converter 100, upon receiving a first stop command sent by the scheduling control unit 300, control the energy storage converter 100 to stop working, wherein the first stop command is generated by the scheduling control unit 300 when it has not received a first completion information and / or a second completion information sent by the photovoltaic inverter 200, and the photovoltaic inverter 200 generates the second completion information upon completing startup.

[0144] In some embodiments, the energy storage converter 100 is further configured to: after starting the energy storage converter 100, if the on-time of the start switch 10 is detected to be longer than a fourth preset time, control the energy storage converter 100 to stop working and send a second stop command to the scheduling control unit 300, so that the scheduling control unit 300 generates a third stop command according to the second stop command and sends the third stop command to the photovoltaic inverter 200, so that the photovoltaic inverter 200 stops working according to the third stop command, wherein the fourth preset time is longer than the first preset time.

[0145] In some embodiments, the photovoltaic inverter 200 is adapted to connect the grid 600 and the photovoltaic module 500. The photovoltaic inverter 200 is further configured to: obtain the open-circuit voltage of the photovoltaic module 500 upon receiving a third start command sent by the dispatch control unit 300; and perform start control on the photovoltaic inverter 200 when the grid 600 is operating normally and the open-circuit voltage is greater than the preset start voltage. The third start command is generated by the dispatch control unit 300 when the photovoltaic energy storage inverter system is powered on and no first start command has been received.

[0146] In some embodiments, the photovoltaic inverter 200 is further configured to: after starting the photovoltaic inverter 200, acquire the output voltage of the photovoltaic module 500; and control the photovoltaic inverter 200 to stop working if the output voltage of the photovoltaic module 500 is less than a preset stop voltage or if the power grid 600 is malfunctioning.

[0147] In some embodiments, the photovoltaic inverter 200 is further configured to send a second completion message to the scheduling control unit 300 after the photovoltaic inverter 200 has been started, following the start-up control of the photovoltaic inverter 200.

[0148] In some embodiments, the photovoltaic inverter 200 is further configured to: after starting control of the photovoltaic inverter 200, upon receiving a first stop command sent by the scheduling control unit 300, control the photovoltaic inverter 200 to stop working, wherein the first stop command is generated by the scheduling control unit 300 when it has not received a first completion information and / or a second completion information sent by the photovoltaic inverter 200, and the energy storage converter 100 generates the first completion information upon completion of startup.

[0149] In some embodiments, the photovoltaic inverter 200 is further configured to: after the photovoltaic inverter 200 is started, upon receiving a third stop command sent by the scheduling control unit 300, control the photovoltaic inverter 200 to stop working, wherein the third stop command is generated by the scheduling control unit 300 according to a second stop command sent by the energy storage converter 100, the second stop command is generated after the energy storage converter 100 is started and the on-time of the start switch 10 is detected to be greater than a fourth preset time, the fourth preset time being greater than a first preset time.

[0150] It should be noted that the specific implementation of the photovoltaic energy storage inverter system in this embodiment of the invention corresponds one-to-one with the specific implementation of the control method of the energy storage converter and the control method of the photovoltaic inverter in the aforementioned embodiments of the invention, and will not be repeated here.

[0151] According to an embodiment of the photovoltaic energy storage inverter system of the present invention, the energy storage converter is equipped with a start switch. When the photovoltaic energy storage inverter system is powered on and the start switch is detected to have been open for a first preset duration, the energy storage converter sends a first start command to the scheduling control unit. The scheduling control unit generates a second start command based on the first start command and sends the second start command to both the photovoltaic inverter and the energy storage converter. When the photovoltaic inverter starts upon receiving the second start command, the system performs start control on the photovoltaic inverter. When the energy storage converter receives the second start command, it stops sending the first start command to the scheduling control unit and stops performing start control on the energy storage converter. Therefore, when the on-time of the start switch meets the first preset time, the energy storage converter sends a first start command to the dispatch control unit. The dispatch control unit generates a second start command based on the first start command and sends the second start command to the energy storage converter and the photovoltaic inverter respectively. After receiving the second start command, the energy storage converter and the photovoltaic inverter perform start control. The start control of the photovoltaic energy storage inverter system is realized only through the start switch, without relying on terminal equipment and display screen, making the start control of the photovoltaic energy storage inverter system simpler.

[0152] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0153] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0154] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0155] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0156] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0157] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0158] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for an energy storage converter, characterized in that, The method is applied to a photovoltaic energy storage inverter system, which includes an energy storage converter, a photovoltaic inverter, and a dispatch control unit. The energy storage converter is equipped with a start switch. When the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet the first preset time, a first start command is sent to the scheduling control unit, so that the scheduling control unit generates a second start command according to the first start command and sends the second start command to the photovoltaic inverter and the energy storage converter respectively, so that the photovoltaic inverter starts according to the second start command; Upon receiving the second start command, the sending of the first start command to the scheduling control unit is stopped, and the start control of the energy storage converter is performed.

2. The method according to claim 1, characterized in that, The energy storage inverter is adapted to connect to a battery cell, wherein, when the photovoltaic energy storage inverter system is not powered on, the method further includes: When the energy storage converter receives electrical energy provided by the battery cell and detects that the on-time of the start switch meets the first preset time condition, the current remaining power of the battery cell is obtained. When the current remaining power is greater than the minimum starting power, the energy storage inverter is controlled to boost the output voltage of the battery cell to power on the photovoltaic energy storage inverter system and send the first start command to the scheduling control unit.

3. The method according to claim 2, characterized in that, The battery unit is connected to the start switch, and the battery unit provides power to the energy storage converter when the start switch is turned on for a period of time that meets a second preset duration.

4. The method according to any one of claims 1-3, characterized in that, After sending the first start command to the scheduling control unit, the method further includes: If the second start command is not received and the operation continues for a third preset duration, the energy storage converter is controlled to stop working.

5. The method according to any one of claims 1-3, characterized in that, After starting the energy storage converter, the method further includes: Upon completion of the startup of the energy storage converter, a first completion message is sent to the scheduling and control unit.

6. The method according to claim 5, characterized in that, After starting the energy storage converter, the method further includes: Upon receiving a first stop command from the scheduling control unit, the energy storage inverter is controlled to stop working. The first stop command is generated by the scheduling control unit when it has not received the first completion information and / or the second completion information from the photovoltaic inverter. The second completion information is generated when the photovoltaic inverter has completed startup.

7. The method according to claim 1, characterized in that, After starting the energy storage converter, the method further includes: If the on-time of the start switch is detected to be longer than a fourth preset time, the energy storage converter is controlled to stop working, and a second stop command is sent to the scheduling control unit. The scheduling control unit then generates a third stop command based on the second stop command and sends the third stop command to the photovoltaic inverter so that the photovoltaic inverter stops working according to the third stop command. The fourth preset time is longer than the first preset time.

8. A control method for a photovoltaic inverter, characterized in that, The method is applied to a photovoltaic energy storage inverter system, which includes an energy storage converter, a photovoltaic inverter, and a dispatch control unit. The energy storage converter is equipped with a start switch. Upon receiving a second start command from the scheduling control unit, the photovoltaic inverter is started. The second start command is generated by the scheduling control unit based on a first start command sent by the energy storage converter. The first start command is generated by the energy storage converter when the photovoltaic energy storage inverter system is powered on and the on-time of the start switch is detected to meet a first preset time. Upon receiving the second start command, the energy storage converter stops sending the first start command and starts starting.

9. The method according to claim 8, characterized in that, The photovoltaic inverter is suitable for connection to the power grid and photovoltaic modules, wherein the method further includes: Upon receiving the third start command sent by the scheduling and control unit, the open-circuit voltage of the photovoltaic module is obtained; When the power grid is operating normally and the open-circuit voltage is greater than the preset start-up voltage, the photovoltaic inverter is started up. The third start-up command is generated by the dispatch control unit when the photovoltaic energy storage inverter system is powered on and the first start-up command has not been received.

10. The method according to claim 9, characterized in that, After performing startup control on the photovoltaic inverter, the method further includes: Obtain the output voltage of the photovoltaic module; If the output voltage of the photovoltaic module is lower than the preset stop voltage, or if the power grid is malfunctioning, the photovoltaic inverter will be controlled to stop working.

11. The method according to any one of claims 8-10, characterized in that, After performing startup control on the photovoltaic inverter, the method further includes: Upon completion of the startup of the photovoltaic inverter, a second completion message is sent to the scheduling and control unit.

12. The method according to claim 11, characterized in that, After performing startup control on the photovoltaic inverter, the method further includes: Upon receiving a first stop command from the scheduling control unit, the photovoltaic inverter is controlled to stop working. The first stop command is generated by the scheduling control unit when it has not received a first completion information and / or a second completion information from the photovoltaic inverter. The energy storage converter generates the first completion information upon completing startup.

13. The method according to claim 8, characterized in that, After performing startup control on the photovoltaic inverter, the method further includes: Upon receiving a third stop command from the scheduling control unit, the photovoltaic inverter is controlled to stop working. The third stop command is generated by the scheduling control unit based on a second stop command sent by the energy storage converter. The second stop command is generated by the energy storage converter after startup and when it is detected that the on-time of the start switch is greater than a fourth preset time, which is greater than the first preset time.

14. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the control method for the energy storage converter according to any one of claims 1-7 or the control method for the photovoltaic inverter according to any one of claims 8-13.

15. An energy storage converter, characterized in that, include: The device includes a memory, a processor, and a control program for an energy storage converter stored in the memory and executable on the processor. When the processor executes the control program for the energy storage converter, it implements the control method for the energy storage converter as described in any one of claims 1-7.

16. A photovoltaic inverter, characterized in that, include: The system includes a memory, a processor, and a control program for a photovoltaic inverter stored in the memory and executable on the processor. When the processor executes the control program for the photovoltaic inverter, it implements the control method for the photovoltaic inverter as described in any one of claims 8-13.

17. A photovoltaic energy storage inverter system, characterized in that, include: Energy storage converter, photovoltaic inverter and dispatch control unit, among which, The energy storage converter is equipped with a start switch. The energy storage converter is configured to send a first start command to the scheduling control unit when the photovoltaic energy storage inverter system is powered on and the start switch is detected to be open for a first preset duration. Upon receiving a second start command from the scheduling control unit, the energy storage converter stops sending the first start command to the scheduling control unit and performs start control on the energy storage converter. The scheduling control unit is configured to generate a second start command based on the first start command, and send the second start command to the photovoltaic inverter and the energy storage converter respectively; The photovoltaic inverter is configured to start up upon receiving a second start command from the scheduling and control unit.

Images