Energy storage system power output control method and energy storage system

Abstract

The invention relates to an energy storage system power output control method and an energy storage system. The energy storage system comprises a first single-phase input module used for being connected with the single-phase energy storage system, a three-phase input module used for being connected with a three-phase power grid, and a three-phase output module used for providing three-phase output. The method comprises the following steps: when power supply input exists in a three-phase input module and a first single-phase input module, obtaining a phase voltage of a first phase of a three-phase power grid; obtaining a first time point according to the phase voltage of the first phase, and starting to generate a first square wave at the first time point so as to control the power output of the first single-phase input module through the first square wave; and controlling the second phase output end and the third phase output end of the three-phase input module and the three phases of the first single-phase input module and the three phases of the three-phase output module to be in one-to-one correspondence and to be switched on simultaneously so as to provide three-phase output through the three-phase output module. According to the invention, flexible power configuration can be realized to meet the large load requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, more particularly, to a power output control method of an energy storage system and the energy storage system. BACKGROUND

[0002] The energy storage system is widely used in the fields of home standby power, emergency power supply and outdoor power supply, and can convert the electric energy in the battery into alternating current energy required by the loads in the above application fields. Common energy storage systems include single-phase energy storage systems and three-phase energy storage systems. The single-phase energy storage system is usually small in size, strong in portability and low in cost, but cannot drive three-phase electrical appliances. The three-phase energy storage system can drive single-phase devices and three-phase devices, but in some application scenarios, the load may be too large and three-phase power supply may be difficult. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a power output control method of an energy storage system and the energy storage system to solve the above technical defects of the prior art.

[0004] The technical scheme adopted by the present application to solve the technical problem is: a power output control method of an energy storage system is constructed, wherein the energy storage system comprises: a first single-phase input module for connecting a single-phase energy storage system, a three-phase input module for connecting a three-phase power grid, and a three-phase output module for providing a three-phase output; the method comprises: When the three-phase input module and the first single-phase input module have power supply input, the phase voltage of the first phase of the three-phase power grid is obtained; A first time point is obtained according to the phase voltage of the first phase, and a first square wave is generated at the first time point to control the power output of the first single-phase input module through the first square wave; The second phase output end and the third phase output end of the three-phase input module and the three-phase one-to-one correspondence between the first single-phase input module and the three-phase output module are controlled to be turned on at the same time to provide three-phase output through the three-phase output module.

[0005] Preferably, in an embodiment of the power output control method of the energy storage system, the energy storage system further comprises: a second single-phase input module for connecting a single-phase energy storage system, and the method comprises: When the three-phase input module, the first single-phase input module and the second single-phase input module have power supply input, the phase voltage of the first phase and the phase voltage of the second phase of the three-phase power grid are obtained; The first time point is obtained according to the phase voltage of the first phase, the first square wave is generated starting from the first time point, the power output of the first single-phase input module is controlled through the first square wave, and the second time point is obtained according to the phase voltage of the second phase, the second square wave is generated starting from the second time point, and the power output of the second single-phase input module is controlled through the second square wave; wherein the duty cycle of the first square wave and the second square wave is the same and the phase difference is 120 degrees. The first phase output end of the three-phase input module and the first single-phase input module and the second single-phase input module are controlled to be turned on simultaneously and one-to-one corresponding to the three-phase output module, so as to provide three-phase output through the three-phase output module.

[0006] Preferably, in the embodiment of the energy storage system power output control method, the first time point is obtained according to the phase voltage of the first phase; comprising: The amplitude of the phase voltage of the first phase is monitored, and the time point corresponding to the amplitude of the phase voltage of the first phase being a preset value is the first time point.

[0007] Preferably, in the embodiment of the energy storage system power output control method, the second time point is obtained according to the phase voltage of the second phase; comprising: The amplitude of the phase voltage of the second phase is monitored, and the time point corresponding to the amplitude of the phase voltage of the second phase being a preset value is the second time point.

[0008] Preferably, in the embodiment of the energy storage system power output control method, the preset value is in the range of 176-264V.

[0009] Preferably, in the embodiment of the energy storage system power output control method, the method further comprises: The power supply state of the three-phase input module and the first single-phase input module is monitored, and when the power supply input of the first single-phase input module or the three-phase input module is abnormal, the first single-phase input module, the three-phase input module and the three-phase output module are controlled to be turned off.

[0010] Preferably, in the embodiment of the energy storage system power output control method, the method further comprises: The power supply state of the three-phase input module, the first single-phase input module and the second single-phase input module is monitored, and when the power supply input of the three-phase input module, the first single-phase input module or the second single-phase input module is abnormal, the first single-phase input module, the second single-phase input module and the three-phase input module are controlled to be turned off.

[0011] Preferably, in the embodiment of the energy storage system power output control method, the method further comprises: monitoring the power supply states of the three-phase input module, the first single-phase input module and the second single-phase input module; when only the first single-phase input module has a power supply abnormality, turning off the output of the first single-phase input module to the three-phase output module, and controlling the first-phase output end of the three-phase input module corresponding to the first phase of the three-phase power grid to be conductive with the corresponding phase of the three-phase output module; when only the second single-phase input module has a power supply abnormality, turning off the output of the second single-phase input module to the three-phase output module, and controlling the second-phase output end of the three-phase input module corresponding to the second phase of the three-phase power grid to be conductive with the corresponding phase of the three-phase output module.

[0012] The application also provides an energy storage system, comprising: a first single-phase input module for connecting a single-phase energy storage system, a three-phase input module for connecting a three-phase power grid, and a three-phase output module for providing a three-phase output; and a control module, wherein the control module is configured to: when the three-phase input module and the first single-phase input module both have power supply inputs, acquiring a phase voltage of a first phase of the three-phase power grid; acquiring a first time point according to the phase voltage of the first phase, and starting to generate a first square wave at the first time point to control the power output of the first single-phase input module through the first square wave; controlling the second-phase output end and the third-phase output end of the three-phase input module and the first single-phase input module to be conductive with the three-phase output module one by one and at the same time, so as to provide a three-phase output through the three-phase output module.

[0013] Preferably, in the embodiment of the energy storage system, the energy storage system further comprises: a second single-phase input module for connecting a single-phase energy storage system, and the control module is further configured to: when the three-phase input module, the first single-phase input module and the second single-phase input module all have power supply inputs, acquiring a phase voltage of a first phase and a phase voltage of a second phase of the three-phase power grid; acquiring a first time point according to the phase voltage of the first phase, and starting to generate a first square wave at the first time point to control the power output of the first single-phase input module through the first square wave, and acquiring a second time point according to the phase voltage of the second phase, and starting to generate a second square wave at the second time point to control the power output of the second single-phase input module through the second square wave; wherein the duty cycles of the first square wave and the second square wave are the same and the phase difference is 120 degrees; The first phase output end of the three-phase input module is controlled, and the first single-phase input module and the second single-phase input module are simultaneously turned on in one-to-one correspondence with three phases of the three-phase output module, so as to provide three-phase output through the three-phase output module.

[0014] The energy storage system power output control method and the energy storage system have the following beneficial effects: flexible power configuration can be realized to meet large load demand. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described below with reference to the drawings and embodiments. In the drawings: Figure 1 is a program flow chart of an embodiment of the energy storage system power output control method of the application; Figure 2 is a structural schematic diagram of an embodiment of the energy storage system; Figure 3 is a structural schematic diagram of another embodiment of the energy storage system; Figure 4 is a program flow chart of another embodiment of the energy storage system power output control method of the application; Figure 5 is a program flow chart of another embodiment of the energy storage system power output control method of the application; Figure 6 is a program flow chart of another embodiment of the energy storage system power output control method of the application; Figure 7 is a program flow chart of another embodiment of the energy storage system power output control method of the application; Figure 8 is a connection schematic diagram of an embodiment of the energy storage system power output control method of the application; Figure 9 is a connection schematic diagram of an embodiment of the energy storage system power output control method of the application. DETAILED DESCRIPTION

[0016] In order to have a clearer understanding of the technical features, objectives and effects of the application, the specific embodiments of the application will be described in detail with reference to the drawings.

[0017] As shown in Figure 1 and Figure 2 , an embodiment of the energy storage system power output control method of the application is shown. As shown in Figure 2 , the energy storage system includes a first single-phase input module 121 for connecting a single-phase energy storage system, a three-phase input module 110 for connecting a three-phase power grid, and a three-phase output module 150 for providing three-phase output. Figure 1In the embodiment of the energy storage system power output control method of the application shown, when the number of single-phase input modules is one, i.e., the energy storage system only includes the first single-phase input module 121, the grid connection method of the application includes: S11, when the three-phase input module 110 and the first single-phase input module 121 both have power supply input, obtaining the phase voltage of the first phase of the three-phase power grid; S12, obtaining the first time point according to the phase voltage of the first phase, and generating a first square wave at the first time point to control the power output of the first single-phase input module 121 through the first square wave; S13, controlling the second phase output end and the third phase output end of the three-phase input module 110 and the three-phase one-to-one correspondence between the first single-phase input module 121 and the three-phase output module 150 to be turned on at the same time, so as to provide three-phase output through the three-phase output module 150.

[0018] Based on step S11, when the energy storage system needs to perform single-phase input and three-phase input simultaneous grid connection to provide three-phase output, the energy storage system must include a single-phase input module, i.e., the first single-phase input module 121. In the specific grid connection process, the power supply input of the first single-phase input module 121 and the power supply input of the three-phase input module 110 are judged. Only when the first single-phase input module 121 and the three-phase input module 110 both have power supply input, the grid connection action can be normally performed. When it is judged that the grid connection action can be performed, the first phase in the three-phase power grid is obtained as the reference phase of the first single-phase input module 121, and the phase voltage of the first phase in the three-phase power grid is monitored to set the phase alignment of the first single-phase input module 121 with the reference phase.

[0019] Based on step S12, after obtaining the phase voltage of the first phase, the first time point is obtained according to the phase voltage of the first phase, and the first square wave is generated at the first time point to control the power output of the first single-phase input module 121 through the first square wave. The process of the single-phase input module performing power output according to the square wave is that the power output is started at the high level stage of the square wave, and the power output is turned off at the low level stage of the square wave.

[0020] Based on step S13, after the first single-phase input module 121 provides output, the second phase output end and the third phase output end of the three-phase input module 110 and the three-phase one-to-one correspondence between the first single-phase input module 121 and the three-phase output module 150 are controlled to be turned on at the same time, and finally three-phase output is provided at the three-phase output module 150. The specific output process of the first single-phase input module 121 can be adjusted according to the input of the three-phase input module 110.

[0021] In an embodiment, a switching module 140 can be provided to switch the conduction state between the modules by controlling the state of the switching module 140.

[0022] As Figure 3 and Figure 4As shown, in an embodiment, the energy storage system further comprises: a second single-phase input module 122 for connecting the single-phase energy storage system, and the method comprises: S21, when the three-phase input module 110, the first single-phase input module 121 and the second single-phase input module 122 all have power input, obtaining the phase voltage of the first phase and the phase voltage of the second phase of the three-phase power grid; S22, obtaining the first time point according to the phase voltage of the first phase, starting to generate the first square wave at the first time point to control the power output of the first single-phase input module 121 through the first square wave, and obtaining the second time point according to the phase voltage of the second phase, starting to generate the second square wave at the second time point to control the power output of the second single-phase input module 122 through the second square wave; wherein the duty cycle of the first square wave and the second square wave is the same and the phase difference is 120 degrees; S23, controlling the first phase output end of the three-phase input module 110 and the first single-phase input module 121 and the second single-phase input module 122 to be turned on at the same time one by one with the three-phase of the three-phase output module 150 to provide three-phase output through the three-phase output module 150.

[0023] Based on step S21, when the energy storage system needs to be connected to the grid simultaneously with two single-phase inputs and three-phase input to provide three-phase output, the energy storage system must contain two single-phase input modules, i.e. the first single-phase input module 121 and the second single-phase input module 122. In the specific process of grid connection, the power input of the first single-phase input module 121, the second single-phase input module 122 and the three-phase input module 110 is first judged. Only when the first single-phase input module 121, the first single-phase input module 121 and the three-phase input module 110 all have power input, the grid connection action can be normally performed. When it is judged that the grid connection action can be performed, the first phase in the three-phase power grid is obtained as the reference phase of the first single-phase input module 121, the phase voltage of the first phase in the three-phase power grid is monitored to set the phase alignment of the first single-phase input module 121 with the reference phase. The second phase in the three-phase power grid is obtained as the reference phase of the second single-phase input module 122, and the phase voltage of the second phase in the three-phase power grid is monitored to set the phase alignment of the second single-phase input module 122 with the reference phase.

[0024] Based on step S22, after obtaining the phase voltage of the first phase, the first time point is obtained according to the phase voltage of the first phase, and the first square wave is started to be output at the first time point to control the first single-phase input module 121. After obtaining the phase voltage of the second phase, the second time point is obtained according to the phase voltage of the second phase, and the second square wave is started to be output at the second time point to control the second single-phase input module 122. The process of the single-phase input module performing power output according to the square wave is that the power output is started at the high level stage of the square wave and the power output is turned off at the low level stage of the square wave. The first time point and the second time point are referenced to different phases of the three-phase input module, and finally the phase difference of the first square wave and the second square wave can be actually obtained, which is 120 degrees.

[0025] Based on step S23, the third phase output end of the three-phase input module 110 and the first single-phase input module 121 and the second single-phase input module 122 are controlled to be turned on one by one and simultaneously with the three-phase output module 150, and finally three-phase output is provided at the three-phase output module 150. Among them, the specific output process of the first single-phase input module 121 and the second single-phase input module 122 can be adjusted according to the input of the three-phase input module 110.

[0026] In an embodiment, the first time point is obtained according to the phase voltage of the first phase; including: monitoring the phase voltage amplitude of the first phase, and obtaining the time point corresponding to when the phase voltage amplitude of the first phase is a preset value as the first time point. Specifically, the change of the phase voltage amplitude of the first phase in the three-phase power grid can be continuously monitored, and the time point corresponding to when the phase voltage amplitude is the preset value is the first time point. In a specific embodiment, the preset value is in the range of 176-264V, for example, it can be 220V, that is, when the phase voltage of the reference phase is 220V, the first square wave control first single-phase input module 121 is started to be generated.

[0027] In an embodiment, the second time point is obtained according to the phase voltage of the second phase; including: monitoring the phase voltage amplitude of the second phase, and obtaining the time point corresponding to when the phase voltage amplitude of the second phase is a preset value as the second time point. Specifically, the change of the phase voltage amplitude of the second phase in the three-phase power grid can be continuously monitored, and the time point corresponding to when the phase voltage amplitude is the preset value is the second time point. In a specific embodiment, the preset value is in the range of 176-264V, for example, it can be 220V, that is, when the phase voltage of the reference phase is 220V, the second square wave control second single-phase input module 122 is started to be generated. Among them, in the process of obtaining the first time point and the second time point, the time point corresponding to when the phase voltage amplitude is the same as much as possible.

[0028] As Figure 5As shown, in one embodiment, the power output control method of the energy storage system of the present invention further includes: S14, monitoring the power supply status of the three-phase input module 110 and the first single-phase input module 121, and controlling the first single-phase input module 121, the three-phase input module 110 and the three-phase output module 150 to shut down when the power supply input of the first single-phase input module 121 or the three-phase input module 110 is abnormal. Specifically, in order to ensure that the three-phase output module 150 can provide three-phase output normally, during the operation of the three-phase output module 150, the power supply status of the first single-phase input module 121 and the three-phase input module 110 is continuously monitored. When the power supply input of the first single-phase input module 121 or the three-phase input module 110 is abnormal, the first single-phase input module 121 and the three-phase input module 110 are controlled to shut down the three-phase output module 150, so as to ultimately shut down the output of the three-phase output module 150 and avoid output imbalance leading to abnormal downstream load.

[0029] like Figure 6 As shown, in one embodiment, the power output control method of the energy storage system of the present invention further includes: S24, monitoring the power supply status of the three-phase input module 110, the first single-phase input module 121, and the second single-phase input module 122, and controlling the first single-phase input module 121, the second single-phase input module 122, and the three-phase input module 110 and the three-phase output module 150 to be turned off when the power supply input of the three-phase input module 110, the first single-phase input module 121, or the second single-phase input module 122 is abnormal. Specifically, in order to ensure that the three-phase output module 150 can provide normal three-phase output, during the operation of the three-phase output module 150, the power supply status of the first single-phase input module 121, the second single-phase input module 122, and the three-phase input module 110 is continuously monitored. When the power supply input of the first single-phase input module 121, the second single-phase input module 122, or the three-phase input module 110 is abnormal, the first single-phase input module 121, the second single-phase input module 122, and the three-phase input module 110 are controlled to shut down the three-phase output module 150, so as to ultimately shut down the output of the three-phase output module 150 and avoid output imbalance that could lead to abnormal downstream load.

[0030] like Figure 7As shown, in an embodiment, the energy storage system power output control method of the present application further comprises: S251, monitoring the power supply states of the three-phase input module 110, the first single-phase input module 121, and the second single-phase input module 122; S252, when only the first single-phase input module 121 has a power supply anomaly, turning off the output of the first single-phase input module 121 to the three-phase output module 150, and controlling the first-phase output end of the three-phase input module 110 corresponding to the first phase of the three-phase power grid to be conductive with the corresponding phase of the three-phase output module 150; S253, when only the second single-phase input module 122 has a power supply anomaly, turning off the output of the second single-phase input module 122 to the three-phase output module 150, and controlling the second-phase output end of the three-phase input module 110 corresponding to the second phase of the three-phase power grid to be conductive with the corresponding phase of the three-phase output module 150.

[0031] Specifically, when only one of the first single-phase input module 121 and the second single-phase input module 122 has an anomaly, the grid-connected mode of steps S11 to S13 can be switched. In the fast switching process, only the first single-phase input module 121 or the second single-phase input module 122 that has an anomaly can be switched. For example, when only the first single-phase input module 121 has a power supply anomaly, the first-phase output end of the three-phase input module 110 corresponding to the first phase of the three-phase power grid is controlled to be conductive with the corresponding phase of the three-phase output module, so as to replace the output of the first single-phase input module 121 by the first phase of the three-phase input module 110. When only the second single-phase input module 122 has a power supply anomaly, the second-phase output end of the three-phase input module 110 corresponding to the second phase of the three-phase power grid is controlled to be conductive with the corresponding phase of the three-phase output module. So as to replace the output of the second single-phase input module 122 by the second phase of the three-phase input module 110.

[0032] Further as Figure 2 As shown, in an embodiment of the energy storage system of the present application, it comprises: a first single-phase input module 121 for connecting a single-phase energy storage system, a three-phase input module 110 for connecting a three-phase power grid, and a three-phase output module 150 for providing a three-phase output; and a control module 130, which is configured to: when both the three-phase input module 110 and the first single-phase input module 121 have power supply inputs, acquire the phase voltage of the first phase of the three-phase power grid; acquire a first time point according to the phase voltage of the first phase, and start generating a first square wave at the first time point to control the power output of the first single-phase input module by the first square wave; control the second-phase output end and the third-phase output end of the three-phase input module 110 and the three-phase one-to-one correspondence between the first single-phase input module 121 and the three-phase output module 150 to be conductive at the same time, so as to provide a three-phase output by the three-phase output module 150.

[0033] When the energy storage system is in operation, if the control module 130 receives an external command confirming that the energy storage system needs to simultaneously connect to the grid with both single-phase and three-phase inputs to provide three-phase output, the control module 130 will first determine the power supply input of the first single-phase input module 121 and the power supply input of the three-phase input module 110. Only when both the first single-phase input module 121 and the three-phase input module 110 have power supply input can the grid connection operation be performed normally. Upon determining that the grid connection operation can be performed, the first phase in the three-phase grid is obtained as the reference phase for the first single-phase input module 121, and the phase voltage of the first phase in the three-phase grid is monitored to align the phase of the first single-phase input module 121 with the reference phase.

[0034] After acquiring the phase voltage of the first phase, the control module 130 obtains a first time point based on the phase voltage and starts outputting a first square wave at the first time point to control the first single-phase input module 121. At the same time, the control module 130 controls the second and third phase output terminals of the three-phase input module 110, as well as the three phases of the first single-phase input module 121 and the three-phase output module 150 to be connected in a one-to-one correspondence and simultaneously turned on, ultimately providing a three-phase output in the three-phase output module 150.

[0035] For example Figure 3 As shown, the energy storage system also includes: a second single-phase input module 122 for connecting to the single-phase energy storage system; the control module 130 is further configured to: acquire the phase voltage of the first phase and the phase voltage of the second phase of the three-phase power grid when the three-phase input module 110, the first single-phase input module 121 and the second single-phase input module 122 all have power input; acquire a first time point based on the phase voltage of the first phase, and generate a first square wave at the first time point to control the power output of the first single-phase input module through the first square wave; acquire a second time point based on the phase voltage of the second phase, and generate a second square wave at the second time point to control the power output of the second single-phase input module through the second square wave; the first square wave and the second square wave have the same duty cycle and a phase difference of 120 degrees, controlling the first phase output terminal of the three-phase input module 110 and the three phases of the first single-phase input module 121 and the second single-phase input module 122 to correspond one-to-one with the three phases of the three-phase output module 150 and conduct simultaneously, so as to provide three-phase output through the three-phase output module 150. The specific output process of the first single-phase input module 121 can be adjusted according to the input of the three-phase input module 110.

[0036] When the control module 130 receives an external instruction confirming that the energy storage system needs to be grid-connected with two single-phase inputs and three-phase input to provide three-phase output, the control module 130 first judges the power supply input of the first single-phase input module 121, the second single-phase input module 122 and the three-phase input module 110. Only when the first single-phase input module 121, the first single-phase input module 121 and the three-phase input module 110 all have power supply input, the grid connection action can be normally performed. When it is judged that the grid connection action can be performed, the first phase in the three-phase power grid is obtained as the reference phase of the first single-phase input module 121, and the phase voltage of the first phase in the three-phase power grid is monitored to set the phase alignment of the first single-phase input module 121 with the reference phase. The second phase in the three-phase power grid is obtained as the reference phase of the second single-phase input module 122, and the phase voltage of the second phase in the three-phase power grid is monitored to set the phase alignment of the second single-phase input module 122 with the reference phase.

[0037] After the control module 130 obtains the phase voltage of the first phase, the first time point is obtained according to the phase voltage of the first phase, and the first single-phase input module 121 is controlled to start outputting the first square wave at the first time point. After obtaining the phase voltage of the second phase, the second time point is obtained according to the phase voltage of the second phase, and the second single-phase input module 122 is controlled to start outputting the second square wave at the second time point. At the same time, the control module 130 controls the third phase output end of the three-phase input module 110 and the first single-phase input module 121 and the second single-phase input module 122 to be one-to-one corresponding with the three phases of the three-phase output module 150 and to be simultaneously turned on, and finally provides three-phase output at the three-phase output module 150. The specific output process of the first single-phase input module 121 and the second single-phase input module 122 can be adjusted according to the input of the three-phase input module 110.

[0038] As shown in Figure 8 In a specific embodiment, when the first single-phase input module 121, the control module 130 sets the switching module 140 according to the corresponding control instruction, so that the three phases of the three-phase output module 150 are turned on corresponding to the positive electrode of the first single-phase input module 121, L1 and L2 of the three-phase input module 110, to supply power to the three-phase output module 150 through the first single-phase input module 121 and the three-phase input module 110, and then supply power to the external equipment through the single-phase output module 160. The zero line of the three-phase output module 150, the zero line of the three-phase input module 110 and the negative electrode of the first single-phase input module 121 are all turned on.

[0039] As shown in Figure 9As shown, in a specific embodiment, when the first single-phase input module 121 and the second single-phase input module 122 are connected, the control module 130 sets the switching module 140 according to the corresponding control instruction, so that the three phases of the three-phase output module 150 are turned on with the positive poles of the first single-phase input module 121, the positive poles of the second single-phase input module 122, and the L1 phase of the three-phase input module 110, so as to supply power to the three-phase output module 150 through the first single-phase input module 121, the second single-phase input module 122, and the three-phase input module 110, and then supply power to the external device through the single-phase output module 160. The zero line of the three-phase output module 150, the zero line of the three-phase input module 110, and the negative poles of the positive poles of the first single-phase input module 121 and the second single-phase input module 122 are all turned on.

[0040] It can be understood that the above embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but cannot be understood as the limitation of the patent scope of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application should belong to the scope of the claims of the present application.

Claims

1. A power output control method for an energy storage system, characterized in that, in, The energy storage system includes: a first single-phase input module for connecting to the single-phase energy storage system, a three-phase input module for connecting to the three-phase power grid, and a three-phase output module for providing three-phase output; the method includes: When both the three-phase input module and the first single-phase input module have power input, the phase voltage of the first phase of the three-phase power grid is obtained; The first time point is obtained based on the phase voltage of the first phase, and a first square wave is generated at the first time point to control the power output of the first single-phase input module through the first square wave. The second and third phase output terminals of the three-phase input module and the first single-phase input module are controlled to correspond one-to-one with the three phases of the three-phase output module and be simultaneously turned on, so as to provide three-phase output through the three-phase output module.

2. The power output control method for an energy storage system according to claim 1, characterized in that, The energy storage system further includes: a second single-phase input module for connecting to the single-phase energy storage system, and the method includes: When the three-phase input module, the first single-phase input module, and the second single-phase input module all have power supply input, the phase voltage of the first phase and the phase voltage of the second phase of the three-phase power grid are obtained; A first time point is obtained based on the phase voltage of the first phase, and a first square wave is generated at the first time point to control the power output of the first single-phase input module. A second time point is obtained based on the phase voltage of the second phase, and a second square wave is generated at the second time point to control the power output of the second single-phase input module. The first square wave and the second square wave have the same duty cycle and a phase difference of 120 degrees. The first phase output terminal of the three-phase input module, as well as the first single-phase input module and the second single-phase input module, are controlled to correspond one-to-one with the three phases of the three-phase output module and be simultaneously turned on, so as to provide three-phase output through the three-phase output module.

3. The power output control method for an energy storage system according to claim 1, characterized in that, The step of obtaining the first time point based on the phase voltage of the first phase includes: The phase voltage amplitude of the first phase is monitored, and the time point corresponding to when the phase voltage amplitude of the first phase is a preset value is obtained as the first time point.

4. The power output control method for an energy storage system according to claim 2, characterized in that, The step of obtaining the second time point based on the phase voltage of the second phase includes: The phase voltage amplitude of the second phase is monitored, and the time point corresponding to when the phase voltage amplitude of the second phase is a preset value is obtained as the second time point.

5. The power output control method for an energy storage system according to claim 3 or 4, characterized in that, The preset value ranges from 176 to 264V.

6. The power output control method for an energy storage system according to claim 1, characterized in that, The method further includes: Monitor the power supply status of the three-phase input module and the first single-phase input module, and when the power supply input of the first single-phase input module or the three-phase input module is abnormal, control the first single-phase input module, the three-phase input module and the three-phase output module to shut down.

7. The power output control method for an energy storage system according to claim 2, characterized in that, The method further includes: Monitor the power supply status of the three-phase input module, the first single-phase input module, and the second single-phase input module. When the power supply input of the three-phase input module, the first single-phase input module, or the second single-phase input module is abnormal, control the first single-phase input module, the second single-phase input module, and the three-phase input module to shut down the three-phase output module.

8. The power output control method for an energy storage system according to claim 2, characterized in that, The method further includes: Monitor the power supply status of the three-phase input module, the first single-phase input module, and the second single-phase input module; When only the first single-phase input module is abnormally powered, the output of the first single-phase input module to the three-phase output module is shut off, and the first phase output terminal of the three-phase input module corresponding to the three-phase power grid is controlled to be connected to the corresponding phase of the three-phase output module. When only the second single-phase input module is abnormally powered, the output of the second single-phase input module to the three-phase output module is shut off, and the second phase output terminal of the three-phase input module corresponding to the three-phase power grid is controlled to be connected to the corresponding phase of the three-phase output module.

9. An energy storage system, characterized in that, include: A first single-phase input module for connecting to a single-phase energy storage system, a three-phase input module for connecting to a three-phase power grid, a three-phase output module for providing three-phase output; and a control module, the control module being used for: When both the three-phase input module and the first single-phase input module have power input, the phase voltage of the first phase of the three-phase power grid is obtained; The first time point is obtained based on the phase voltage of the first phase, and a first square wave is generated at the first time point to control the power output of the first single-phase input module through the first square wave. The second and third phase output terminals of the three-phase input module and the first single-phase input module are controlled to correspond one-to-one with the three phases of the three-phase output module and be simultaneously turned on, so as to provide three-phase output through the three-phase output module.

10. The energy storage system according to claim 9, characterized in that, The energy storage system further includes: a second single-phase input module for connecting to the single-phase energy storage system, and the control module is further used for: When the three-phase input module, the first single-phase input module, and the second single-phase input module all have power supply input, the phase voltage of the first phase and the phase voltage of the second phase of the three-phase power grid are obtained; A first time point is obtained based on the phase voltage of the first phase, and a first square wave is generated at the first time point to control the power output of the first single-phase input module. A second time point is obtained based on the phase voltage of the second phase, and a second square wave is generated at the second time point to control the power output of the second single-phase input module. The first square wave and the second square wave have the same duty cycle and a phase difference of 120 degrees. The first phase output terminal of the three-phase input module, as well as the first single-phase input module and the second single-phase input module, are controlled to correspond one-to-one with the three phases of the three-phase output module and be simultaneously turned on, so as to provide three-phase output through the three-phase output module.

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