Control method for changeover switch apparatus

Abstract

A control method for a changeover switch apparatus (300), the method comprising: when a first branch (310) is in a connected state and a second branch (320) is in a disconnected state, upon detecting that a power grid (220) is in an abnormal state, controlling the first branch (310) to disconnect; upon detecting that the branch state of the first branch (310) reaches a target branch state, controlling the second branch (320) to connect; and upon detecting that the voltage across the changeover switch apparatus (300) is stable, controlling the second branch (320) to disconnect, so as to disconnect the power connection between both an energy storage power module (210) and an electrical device (230) and the power grid (220).

Description

Control method of switching device

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application No. 2024108431343, filed on June 26, 2024, and claims the priority of the Chinese patent application No. 2024108431343, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to a control method of a switching device, a switching method and an energy storage system. BACKGROUND

[0004] For a system in which multiple energy storage power supplies are connected in parallel, the switching time of each energy storage power supply may be different, i.e., the attraction and disconnection time of multiple K1 in FIG. 2 are different. In the case of a power supply system with a load, when the switch of a certain energy storage power supply in the power supply system is attracted first, the required current of the load will be provided by the energy storage power supply, at this time, the load power of the energy storage power supply can be much larger than the rated power, which may cause the switch of the energy storage power supply to be overloaded and stuck, and may cause the energy storage power supply to be overloaded and shut down.

[0005] As shown in FIG. 2, an external switch, i.e., K2 in FIG. 2, is usually provided at the output end of multiple energy storage power supplies. Before multiple K1 are attracted in succession, K2 can be attracted first, and the power grid can also supply power to the load, avoiding the K1 of a certain energy storage power supply from bearing the current passed through the K1 of the remaining energy storage power supplies, solving the problems of switch overload and sticking of the energy storage power supply and overload shutdown of the energy storage power supply.

[0006] However, the external switch is usually a mechanical switch, and when the load demand current is large and multiple energy storage power supply switches are attracted in succession, switching the external switch may cause a large change in instantaneous current when the external switch is switched, which may cause the external switch to arc and damage the external switch.

[0007] SUMMARY

[0008] The present disclosure aims to at least solve one of the technical problems existing in the prior art. To this end, the present disclosure proposes a control method of a switching device, a switching method and an energy storage system, which can avoid the arc of the first mechanical switch of the first branch of the switching device and ensure the safe operation of the switching device.

[0009] The disclosure provides a control method of a switching switch device, one end of the switching switch device is connected with an energy storage power supply module and an electrical equipment, the other end of the switching switch device is connected with a power grid, the switching switch device is configured to switch power supply among the energy storage power supply module, the electrical equipment and the power grid, the switching switch device includes a first branch and a second branch in parallel, the first branch is provided with at least one first mechanical switch, the second branch is provided with at least one first semiconductor switch, the method is applied to the energy storage power supply module, and the method comprises:

[0010] In the case that the energy storage power supply module is electrically connected with the power grid, the first branch is in a connected state and the second branch is in a disconnected state, when it is detected that the power grid state is abnormal, the first branch is controlled to be disconnected;

[0011] In the case that it is detected that the branch state of the first branch reaches a target branch state, the second branch is controlled to be connected;

[0012] In the case that it is detected that the voltage across the switching switch device is stable, the second branch is controlled to be disconnected, so as to disconnect the power supply connection between the energy storage power supply module and the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment.

[0013] According to one embodiment of the disclosure, the target branch state is that the current of the first branch is greater than a disconnection current threshold.

[0014] According to one embodiment of the disclosure, the branch state of the first branch reaching the target branch state comprises:

[0015] The duration for which the first mechanical switch is controlled to be disconnected is greater than or equal to a target duration, so that the current of the first branch is greater than the disconnection current threshold.

[0016] According to one embodiment of the disclosure, the second branch is provided with a second mechanical switch in series with the first semiconductor switch, and in the case that the voltage across the switching switch device is stable, the second branch is controlled to be disconnected, comprising:

[0017] The first semiconductor switch of the second branch is controlled to be disconnected first, and then the second mechanical switch of the second branch is controlled to be disconnected. According to one embodiment of the disclosure, the method further comprises:

[0018] In a case where the energy storage power supply module is disconnected from the power grid, the first branch and the second branch are in a disconnected state, and the power grid state is detected to be normal, the second branch is controlled to be connected first, and then the first branch is controlled to be connected, so as to connect the power supply connection between the energy storage power supply module, the electrical equipment and the power grid, and the energy storage power supply module and the power grid supply power to the electrical equipment.

[0019] According to one embodiment of the present disclosure, the method further comprises:

[0020] In a case where the energy storage power supply module is connected to the power grid, the first branch and the second branch are in a connected state, and the power grid state is detected to be abnormal, the first branch is controlled to be disconnected first, and then the second branch is controlled to be disconnected, so as to disconnect the power supply connection between the energy storage power supply module, the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment.

[0021] The present disclosure provides a switching method of a switching switch device, one end of the switching switch device is connected to an energy storage power supply module and electrical equipment, the other end of the switching switch device is connected to a power grid, the switching switch device is configured as a power supply switching between the energy storage power supply module, the electrical equipment and the power grid, the switching switch device comprises a first branch and a second branch in parallel, the first branch is provided with at least one first mechanical switch, and the second branch is provided with at least one first semiconductor switch, the method is applied to the switching switch device, and the method comprises:

[0022] In a case where the first branch is in a connected state and the second branch is in a disconnected state, a first control instruction is received, the first branch is controlled to be disconnected, and the first control instruction is issued in a case where the energy storage power supply module is connected to the power grid and it is determined that the power grid state is abnormal;

[0023] In a case where the branch state of the first branch reaches a target branch state, the second branch is controlled to be connected;

[0024] In a case where the voltage at both ends of the switching switch device is stable, the second branch is controlled to be disconnected, so as to disconnect the power supply connection between the energy storage power supply module, the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment.

[0025] According to one embodiment of the present disclosure, the switching method of the switching switch device further comprises:

[0026] In a case where the first branch and the second branch are both in a disconnected state, a second control instruction is received, the second branch is controlled to be connected first, and then the first branch is controlled to be connected, so as to connect the power supply connection between the energy storage power supply module, the electrical equipment and the power grid, the energy storage power supply module and the power grid supply power to the electrical equipment, and the second control instruction is issued in a case where the energy storage power supply module is disconnected from the power grid and it is determined that the power grid is normal.

[0027] According to one embodiment of the present disclosure, the switching method of the switching switch device further comprises:

[0028] In a case where the first branch and the second branch are both in a connected state, the first control instruction is received, the first branch is controlled to be disconnected first, and then the second branch is controlled to be disconnected, so as to disconnect the power supply connection between the energy storage power supply module, the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment.

[0029] The present disclosure provides an energy storage system, comprising:

[0030] an energy storage power supply module;

[0031] a switching switch device, one end of the switching switch device being connected with the energy storage power supply module and the electrical equipment, the other end of the switching switch device being connected with the power grid, the switching switch device being configured to switch the power supply between the energy storage power supply module, the electrical equipment and the power grid, the switching switch device comprising a first branch and a second branch connected in parallel, the first branch being provided with at least one first mechanical switch, and the second branch being provided with at least one first semiconductor switch;

[0032] a first controller, the first controller being configured to execute the control method of the switching switch device of the first aspect.

[0033] The present disclosure provides a switching switch device, one end of the switching switch device being connected with an energy storage power supply module and electrical equipment, the other end of the switching switch device being connected with a power grid, the switching switch device being configured to switch the power supply between the energy storage power supply module, the electrical equipment and the power grid, the switching switch device comprising:

[0034] a first branch and a second branch connected in parallel, the first branch being provided with at least one first mechanical switch, and the second branch being provided with at least one first semiconductor switch;

[0035] a second controller, the second controller being configured to execute the control method of the switching switch device of the first aspect.

[0036] According to one embodiment of the present disclosure, the second branch is further provided with a second mechanical switch, which is in series with the first semiconductor switch.

[0037] The present disclosure provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method of the switching device according to the first aspect.

[0038] The present disclosure provides a non-transitory computer-readable storage medium, which stores a computer program, wherein the computer program is executable by a processor to implement the control method of the switching device according to the first aspect.

[0039] The present disclosure provides a computer program product, comprising a computer program, wherein the computer program is executable by a processor to implement the control method of the switching device according to the first aspect.

[0040] The above one or more technical solutions in the present disclosure have at least the following technical effects: by connecting the first semiconductor switch and the first mechanical switch in parallel in the switching device, when the first mechanical switch is turned off and the current change impact will cause arc drawing, the first semiconductor switch is turned on to share the current change impact of the first mechanical switch, so as to avoid arc drawing caused by current change of the first mechanical switch and ensure safe operation of the switching device. Additional aspects and advantages of the present disclosure will be partially given in the following description, partially will become obvious from the following description, or will be understood by practicing the present disclosure.

[0041] BRIEF DESCRIPTION OF DRAWINGS

[0042] The above and / or additional aspects and advantages of the present disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0043] FIG. 1 is a flowchart of a control method of a switching device according to an embodiment of the present disclosure;

[0044] FIG. 2 is a structural diagram of an energy storage system according to the related art;

[0045] FIG. 3 is a structural diagram of an energy storage system according to an embodiment of the present disclosure;

[0046] FIG. 4 is a structural diagram of a switching device according to an embodiment of the present disclosure;

[0047] FIG. 5 is another structural diagram of a switching device according to an embodiment of the present disclosure;

[0048] FIG. 6 is a flowchart of a switching method of a switching device according to an embodiment of the present disclosure;

[0049] Fig. 7 is a structural schematic diagram of the energy storage system according to an embodiment of the present disclosure;

[0050] Fig. 8 is a structural schematic diagram of the switching device according to an embodiment of the present disclosure;

[0051] Fig. 9 is a structural schematic diagram of the electronic device according to an embodiment of the present disclosure.

[0052] Reference signs: energy storage power module 210, power grid 220, electrical equipment 230, switching device 300, first branch 310, second branch 320, first mechanical switch 330, first semiconductor switch 340, first end 350, second end 360, second mechanical switch 370, first controller 710, second controller 810. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present disclosure will be described clearly below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present disclosure.

[0054] The terms "first", "second", and the like in the present disclosure are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. can be a class, and the number of objects is not limited, for example, the first object can be one or more. In addition, "and / or" in the present disclosure indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0055] The control method of the switching device 300, the switching method of the switching device 300, the energy storage system, the switching device, the electronic device, and the readable storage medium provided by the embodiments of the present disclosure will be described in detail below in conjunction with the drawings and specific embodiments and their application scenarios.

[0056] Among them, the control method of the switching device 300 and the switching method of the switching device 300 can be applied to a terminal, and can be specifically executed by hardware or software in the terminal.

[0057] The terminal includes, but is not limited to, a portable communication device such as a mobile phone or tablet computer having a touch-sensitive surface (e.g., a touchscreen display and / or touchpad). It will also be appreciated that, in some embodiments, the terminal can not be a portable communication device, but rather a desktop computer having a touch-sensitive surface (e.g., a touchscreen display and / or touchpad).

[0058] In the various embodiments below, a terminal comprising a display and a touch-sensitive surface is described. However, it will be appreciated that the terminal can comprise one or more other physical user interface devices such as physical keyboards, mice and joysticks.

[0059] The control method of the switching switch device 300 and the switching method of the switching switch device 300 provided by the embodiments of the present disclosure can be executed in an electronic device, or the control method of the switching switch device 300 and the switching method of the switching switch device 300 provided by the embodiments of the present disclosure can also be executed in a functional module or a functional entity in the electronic device.

[0060] That is, the control method of the switching switch device 300 and the switching method of the switching switch device 300 provided by the embodiments of the present disclosure can be executed in an electronic device, or the control method of the switching switch device 300 and the switching method of the switching switch device 300 provided by the embodiments of the present disclosure can also be executed in a functional module or a functional entity in the electronic device.

[0061] The electronic device mentioned in the embodiments of the present disclosure includes but is not limited to mobile phones, tablets, computers, cameras, wearable devices, etc., and the control method of the switching switch device 300 and the switching method of the switching switch device 300 provided by the embodiments of the present disclosure will be described below. The control method of the switching switch device 300 and the switching method of the switching switch device 300 provided by the embodiments of the present disclosure are taken as an example of the execution subject.

[0062] As shown in FIG. 3, one end of the switching switch device 300 of the embodiments of the present disclosure is connected with the energy storage power supply module 210 and the electrical equipment 230, the other end of the switching switch device 300 is connected with the power grid 220, and the switching switch device 300 is configured as a power supply switching between the energy storage power supply module 210, the electrical equipment 230 and the power grid 220.

[0063] In this embodiment, the two ends of the switching switch device 300 can include a first end 350 and a second end 360, the first end 350 of the switching switch device 300 can be an input end, and the second end 360 of the switching switch device 300 can be an output end. The first end 350 of the switching switch device 300 is connected with the energy storage power supply module 210 and the electrical equipment 230, and the second end 360 of the switching switch device 300 is connected with the power grid 220.

[0064] The energy storage power supply module 210 is a device capable of storing electric energy and outputting the stored electric energy, and can be an energy storage device such as a photovoltaic power supply. The output end of the energy storage power supply module 210 can be connected to a power conversion device such as an inverter.

[0065] The electric device 230 can be an industrial electric device such as a machine tool, an agricultural electric device such as a water pump, and a household appliance such as a washing machine.

[0066] In this embodiment, as shown in FIG. 3, a plurality of energy storage power supply modules 210 can be included in the system, and the output end of each energy storage power supply module 210 can be connected to a switching device. The closing or opening time of the switching device corresponding to each energy storage power supply module 210 can be different.

[0067] In this embodiment, the first end 350 of the switching device 300 can be connected in parallel with a plurality of nodes, and each node can be connected to the switching device at the output end of the energy storage power supply module 210, thereby being connected to the energy storage power supply module 210.

[0068] As shown in FIG. 3, the first end 350 of the switching device 300 can also be connected to the electric device 230, and the second end 360 of the switching device 300 is connected to the power grid 220.

[0069] In this embodiment, when the switching device 300 is closed, the electric energy output by the energy storage power supply module 210 can be transmitted to the power grid 220 through the switching device 300.

[0070] In this embodiment, as shown in FIG. 4, the switching device 300 includes a first branch 310 and a second branch 320 connected in parallel, the first branch 310 is provided with at least one first mechanical switch 330, and the second branch 320 is provided with at least one first semiconductor switch 340.

[0071] That is, between the first end 350 and the second end 360 of the switching device 300, the first branch 310 and the second branch 320 connected in parallel are included, the first branch 310 is provided with at least one first mechanical switch 330, and the second branch 320 is provided with at least one first semiconductor switch 340.

[0072] The first mechanical switch 330 is a switching device that controls the connection or disconnection of the circuit through the physical contact or physical separation of the control component.

[0073] That is, when the control component of the first mechanical switch 330 is in physical contact, the circuit is connected, and when the control component of the first mechanical switch 330 is in physical separation, the circuit is disconnected.

[0074] The first mechanical switch 330 can include a component that switches between physical contact and physical separation, and when the component realizes physical contact, the circuit is connected, and when the component realizes physical separation, the circuit is disconnected.

[0075] For example, the first mechanical switch 330 can be a contactor, a controllable circuit breaker, an electric switch, etc.

[0076] In this embodiment, the first mechanical switch 330 can also have a manually operated interface, such as a button or a handle, etc., which can provide an emergency manual closing or opening operation when the power supply of the first mechanical switch 330 or the control command of the first mechanical switch 330 fails.

[0077] In this embodiment, the first semiconductor switch 340 is a switch that realizes the on-off of the circuit by using the on-off characteristics of the semiconductor device.

[0078] The first semiconductor switch 340 can be a power semiconductor device, such as an insulated gate bipolar transistor, a metal oxide semiconductor field effect transistor, or a thyristor, etc.

[0079] In this embodiment, the first semiconductor switch 340 can be a single power semiconductor device, or two power semiconductor devices in anti-parallel connection.

[0080] In this embodiment, a plurality of mechanical switches in series can be arranged in the first branch 310, and when all the mechanical switches in the first branch 310 are closed, the first branch 310 is in a connected state, and when there is a mechanical switch open in the first branch 310, the first branch 310 is in a disconnected state.

[0081] A first semiconductor switch 340 and a plurality of mechanical switches can be arranged in the second branch 320, and when all the mechanical switches in the second branch 320 are closed and the first semiconductor switch 340 is turned on, the second branch 320 is in a connected state, and when there is a mechanical switch open or the first semiconductor switch 340 is disconnected in the second branch 320, the second branch 320 is in a disconnected state.

[0082] It can be understood that when the first branch 310 and the second branch 320 are both in a disconnected state, the switching switch device 300 is disconnected, and when the first branch 310 and the second branch 320 are in a closed state, the switching switch device 300 is closed.

[0083] In this embodiment, the switching switch device 300 can have a visible switch state, that is, the operator can determine whether the switching switch device 300 is in a closed state or a disconnected state by observing the switching switch device 300.

[0084] In this embodiment, the switching switch device 300 can be powered by the connected energy storage power module 210, or can be connected to other power supply devices for power supply, so as to realize the switching of the switching state, and the power supply mode can be double-sided power supply or single-sided power supply.

[0085] The control method of the switching switch device 300 in the embodiment of the present disclosure is applied to the energy storage power module 210, and is used for controlling the opening or closing of the switching switch device 300.

[0086] In the following, taking the first branch 310 of the switching switch device 300 being provided with a first mechanical switch 330 and the second branch 320 being provided with a first semiconductor switch 340 as an example, the control method of the switching switch device 300 in the present disclosure is introduced.

[0087] As shown in FIG. 1, the control method of the switching switch device 300 includes steps 110-130.

[0088] In step 110, when the energy storage power module 210 is electrically connected with the power grid 220, the first branch 310 is in a connected state and the second branch 320 is in an open state, and the state of the power grid 220 is detected to be abnormal, the first branch 310 is controlled to be opened.

[0089] The first branch 310 in the connected state is a state in which current can pass through the first branch 310, and the first mechanical switch 330 is in a closed state.

[0090] The second branch 320 in the open state is a state in which current cannot pass through the second branch 320, and the first semiconductor switch 340 is in an open state.

[0091] That is, when the first branch 310 is in the connected state, current can pass through the first branch 310, and when the second branch 320 is in the open state, current cannot pass through the second branch 320.

[0092] In this embodiment, when the first branch 310 is in the connected state and the second branch 320 is in the open state, the energy storage power module 210 is electrically connected with the power grid 220, and the electric energy of the energy storage power module 210 can be output to the power grid 220.

[0093] In this embodiment, a power grid state detection device can be provided, which is configured to determine whether the state of the power grid 220 is abnormal by detecting the voltage and other parameters of the power grid 220.

[0094] When the state of the power grid 220 is detected to be abnormal, the first branch 310 is controlled to be opened, so as to disconnect the connection between the energy storage power module 210 and the power grid 220.

[0095] When the demand power of the electrical equipment 230 is large, when the connection between the energy storage power supply module 210 and the power grid 220 is disconnected, the switch device corresponding to the other energy storage power supply module 210 is closed, and the plurality of energy storage power supply modules 210 supply power to the electrical equipment 230.

[0096] Step 120, in the case where it is detected that the branch state of the first branch 310 reaches the target branch state, the second branch 320 is controlled to be connected.

[0097] The branch state of the first branch 310 is used to represent the running condition of the first branch 310, which can be the current of the first branch 310, the disconnection time, etc.

[0098] The target branch state can be a state in which the first mechanical switch 330 cannot withstand the input current impact after the first mechanical switch 330 is disconnected.

[0099] In this embodiment, when the first branch 310 is disconnected, the switch devices corresponding to the energy storage power supply modules 210 are attracted in succession, and the switch devices corresponding to the energy storage power supply modules 210 that have been attracted may bear the current passing through the switch devices corresponding to the remaining energy storage power supply modules 210.

[0100] Moreover, during the disconnection of the first mechanical switch 330, the branch state of the first branch 310 reaches the target branch state due to the large change in current.

[0101] When the branch state of the first branch 310 reaches the target branch state, the first semiconductor switch 340 is controlled to be conductive, and the input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340, thereby reducing the current impact of the first mechanical switch 330.

[0102] Step 130, in the case where it is detected that the voltage across the switching switch device 300 is stable, the second branch 320 is controlled to be disconnected, thereby disconnecting the power supply connection between the energy storage power supply module 210 and the electrical equipment 230 and the power grid 220, and the energy storage power supply module 210 supplies power to the electrical equipment 230.

[0103] In this embodiment, after the switch devices of the energy storage power supply module 210 are all closed, the plurality of energy storage power supply modules 210 supply power to the electrical equipment 230 at the same time, the current output from the energy storage power supply module 210 no longer has large fluctuations, and the voltage across the switching switch device 300 is stable.

[0104] In this embodiment, the voltage of the first end 350 and the second end 360 is stable, the shunt task of the first semiconductor switch 340 is completed, and the first semiconductor switch 340 can be controlled to be disconnected, thereby disconnecting the power supply connection between the energy storage power supply module 210 and the electrical equipment 230 and the power grid 220.

[0105] As shown in FIG. 2, an external switch, K2 in FIG. 2, is generally arranged at the output end of the plurality of energy storage power supplies in parallel. Before the plurality of K1s are sequentially attracted, K2 can be attracted first, and the power grid can also supply power to the load, avoiding the K1 of a certain energy storage power supply from bearing the current passing through the K1 of the remaining energy storage power supplies, and solving the problems of switch overloading sticking and energy storage power supply overload shutdown.

[0106] However, the external switch is generally a mechanical switch. When the load demand current is large and the switches of the plurality of energy storage power supplies are sequentially attracted, switching the external switch may cause a large instantaneous current change when the external switch is switched, which may cause arc of the external switch and damage the external switch.

[0107] According to the control method of the switching device 300 provided by the embodiment of the present disclosure, by connecting the first semiconductor switch 340 and the first mechanical switch 330 in parallel in the switching device 300, when the first mechanical switch 330 is disconnected and an arc is about to be caused due to the impact of current change, the first semiconductor switch 340 is turned on, which can share the current change impact of the first mechanical switch 330 and avoid the arc of the first mechanical switch 330 caused by current change, thereby ensuring the safe operation of the switching device 300.

[0108] In some embodiments, the target branch state is that the current of the first branch 310 is greater than a disconnection current threshold.

[0109] The disconnection current threshold can be determined based on the current size that the first mechanical switch 330 can withstand when disconnected, and the disconnection current threshold can be less than the current size that the first mechanical switch 330 can withstand when the current changes.

[0110] For example, the current size that the first mechanical switch 330 can withstand when the current changes is 25A, and the disconnection current threshold can be determined as 20A.

[0111] In this embodiment, when the current of the first branch 310 is greater than the disconnection current threshold, the first semiconductor switch 340 is controlled to be turned on.

[0112] For example, when the disconnection current threshold is 20A and the current of the first branch 310 is greater than 20A, the first semiconductor switch 340 is controlled to be turned on.

[0113] In actual execution, a detection device for the current of the first branch 310 can be arranged to determine whether the current of the first branch 310 is greater than the disconnection current threshold.

[0114] In this embodiment, when the current of the first branch 310 is greater than the breaking current threshold, it can be considered that the broken first mechanical switch 330 will not be able to withstand the impact of the input current, the first semiconductor switch 340 is controlled to be turned on, and the impact current of the first mechanical switch 330 can be shared to avoid arc damage of the first mechanical switch 330 and ensure safe operation of the switching device 300.

[0115] In some embodiments, the branch state of the first branch 310 reaching the target branch state includes:

[0116] The duration of controlling the first mechanical switch 330 to be broken is greater than or equal to the target duration, so that the current of the first branch 310 is greater than the breaking current threshold.

[0117] In this embodiment, the target duration can be determined based on the duration when the current of the first branch 310 is greater than the breaking current threshold.

[0118] For example, the duration when the current of the first branch 310 is greater than the breaking current threshold is 5s, and the target duration can be determined as 4s.

[0119] In this embodiment, when the duration of the first mechanical switch 330 being broken is equal to the target duration, the first semiconductor switch 340 is controlled to be turned on.

[0120] For example, the target duration is 4s, and after the first mechanical switch 330 is broken for 4s, the first semiconductor switch 340 is controlled to be turned on.

[0121] In this embodiment, when the duration of the first mechanical switch 330 being broken is equal to the target duration, it can be considered that the broken first mechanical switch 330 will not be able to withstand the impact of the input current, the first semiconductor switch 340 is controlled to be turned on, and the impact current of the first mechanical switch 330 can be shared to avoid arc damage of the first mechanical switch 330 and ensure safe operation of the switching device 300.

[0122] In some embodiments, as shown in FIG. 5, the second branch 320 is provided with a second mechanical switch 370 and a first semiconductor switch 340 in series, and under the condition that the voltage across the switching device 300 is stable, the second branch 320 is controlled to be broken, including:

[0123] First, the first semiconductor switch 340 of the second branch 320 is controlled to be broken, and then the second mechanical switch 370 of the second branch 320 is controlled to be broken.

[0124] Among them, the second mechanical switch 370 can include a component that switches between physical contact and physical separation, and when the component realizes physical contact, the circuit is connected, and when the component realizes physical separation, the circuit is disconnected.

[0125] For example, the second mechanical switch 370 can be a contactor, a controllable circuit breaker, an electric switch, etc.

[0126] In this embodiment, the second mechanical switch 370 is in series with the first semiconductor switch 340, and the second mechanical switch 370 can realize more flexible circuit switching. For example, in the case of a fault in the first semiconductor switch 340, the connection of the second branch 320 can be disconnected through the second mechanical switch 370.

[0127] In this embodiment, after controlling the first semiconductor switch 340 to be disconnected, the second mechanical switch 370 is controlled to be disconnected, which can ensure that the second branch 320 can share the current of the first branch 310, and the second mechanical switch 370 will not be impacted by the input current.

[0128] In this embodiment, the first mechanical switch 330 and the second mechanical switch 370 are both disconnected, which can ensure that the system has sufficient safety distance.

[0129] In some embodiments, the control method of the switching switch device 300 further includes:

[0130] In the case that the energy storage power supply module 210 is disconnected from the power grid 220, the first branch 310 and the second branch 320 are both in a disconnected state, and the power grid 220 is detected to be in a normal state, the second branch 320 is first controlled to be connected, and then the first branch 310 is controlled to be connected, so as to connect the power supply connection between the energy storage power supply module 210 and the electrical equipment 230 and the power grid 220, and the energy storage power supply module 210 and the power grid 220 supply power to the electrical equipment 230.

[0131] In this embodiment, the first semiconductor switch 340 is in a disconnected state, the first mechanical switch 330 is in a disconnected state, the first branch 310 and the second branch 320 are both in a disconnected state, the energy storage power supply module 210 is disconnected from the power grid 220, and the energy storage power supply module 210 cannot deliver electrical energy to the power grid 220, and the power grid 220 does not supply power to the electrical equipment 230.

[0132] In this embodiment, when the switching switch device 300 is closed, part of the switching devices corresponding to the energy storage power supply module 210 can be disconnected in succession. In the process of closing the switching devices of each energy storage power supply module 210 in succession, the first semiconductor switch 340 is first controlled to be conductive, which can share and replace the impact of current change borne by the first mechanical switch 330.

[0133] In this embodiment, after the switching devices of the energy storage power supply module 210 are all disconnected and the output current of the energy storage power supply module 210 is stable, the first mechanical switch 330 can be controlled to be closed, which can ensure the normal flow of current and the normal operation of the system.

[0134] In this embodiment, after the power supply connection between the energy storage power supply module 210, the electrical equipment 230 and the power grid 220 is turned on, the energy storage power supply module 210 and the power grid 220 can supply power to the electrical equipment 230 at the same time.

[0135] In this embodiment, after the first mechanical switch 330 is closed, the shunt task of the first semiconductor switch 340 is completed, and the first semiconductor switch 340 can be turned off to reduce the current loss of the system.

[0136] Generally, the peripheral switch uses a semiconductor switch alone, and there are problems such as large loss and low system efficiency when the semiconductor switch is turned on for a long time.

[0137] In the embodiments of the present disclosure, the first semiconductor switch 340 works with the first mechanical switch 330 to share the input current of the first mechanical switch 330, and the first semiconductor switch 340 can be turned off after completing the shunt task, so as to avoid the power loss and device loss caused by long-term conduction and improve the power transmission efficiency of the system.

[0138] In this embodiment, when the second branch 320 includes the second mechanical switch 370 and the first semiconductor switch 340 in series, the second mechanical switch 370 is controlled to be closed first, and then the first semiconductor switch 340 is controlled to be turned on.

[0139] In some embodiments, the control method of the switching switch device 300 further includes:

[0140] In the case that the energy storage power supply module 210 and the power grid 220 are electrically connected, the first branch 310 and the second branch 320 are in the connected state, and it is detected that the state of the power grid 220 is abnormal, the first branch 310 is controlled to be turned off first, and then the second branch 320 is controlled to be turned off, so as to turn off the power supply connection between the energy storage power supply module 210, the electrical equipment 230 and the power grid 220, and the energy storage power supply module 210 supplies power to the electrical equipment 230.

[0141] In this embodiment, the first semiconductor switch 340 is in the turned-on state, the first mechanical switch 330 is in the closed state, the first branch 310 and the second branch 320 are in the connected state, the energy storage power supply module 210 is electrically connected with the power grid 220, and the power grid 220 can supply power to the electrical equipment 230.

[0142] In this embodiment, when the switching switch device 300 is controlled to be turned off, the switch devices of each energy storage power supply module 210 can be controlled to be closed in turn, the first mechanical switch 330 is turned off first, the first semiconductor switch 340 remains in the turned-on state, and the input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340, so as to reduce the current change impact of the turned-off first mechanical switch 330.

[0143] In this embodiment, after the switch devices of the energy storage power supply modules 210 are all turned off, the first semiconductor switch 340 completes the role of sharing current, and the first semiconductor switch 340 can be controlled to be turned off.

[0144] In this embodiment, the power supply connection between the energy storage power supply modules 210 and the electrical equipment 230 and the power grid 220 is disconnected, and the energy storage power supply modules 210 can independently supply power to the electrical equipment 230.

[0145] The switching method of the switching device 300 is also provided in the embodiments of the present disclosure.

[0146] One end of the switching device 300 is connected with the energy storage power supply modules 210 and the electrical equipment 230, and the other end of the switching device 300 is connected with the power grid 220. The switching device 300 is configured to switch the power supply among the energy storage power supply modules 210, the electrical equipment 230 and the power grid 220. The switching device 300 includes a first branch 310 and a second branch 320 connected in parallel. The first branch 310 is provided with at least one first mechanical switch 330, and the second branch 320 is provided with at least one first semiconductor switch 340. The switching method of the switching device 300 is applied to the switching device 300.

[0147] As shown in FIG. 6, the switching method of the switching device 300 includes steps 610-630.

[0148] In step 610, a first control instruction is received when the first branch 310 is in a connected state and the second branch 320 is in a disconnected state, and the first branch 310 is controlled to be turned off.

[0149] In this embodiment, when the first branch 310 is in a connected state and the second branch 320 is in a disconnected state, the energy storage power supply modules 210 are electrically connected with the power grid 220, and the electrical energy of the energy storage power supply modules 210 can be output to the power grid 220.

[0150] The first control instruction is an instruction that can control the switching device 300 to be turned off. The first control instruction is issued when the energy storage power supply modules 210 are electrically connected with the power grid 220 and it is determined that the state of the power grid 220 is abnormal.

[0151] In this embodiment, the first control instruction can be issued by the energy storage power supply modules 210.

[0152] In this embodiment, the switching device 300 can include an instruction receiving device, and the instruction receiving device can obtain the first control instruction.

[0153] In actual implementation, the instruction receiving device can acquire the first control instruction through wired communication such as dry contact, RS485, or wireless communication such as WiFi.

[0154] In this embodiment, when the energy storage power supply module 210 detects that the grid 220 is abnormal, the energy storage power supply module 210 sends a first control instruction to the switching device 300, and after the switching device 300 receives the first control instruction, the switching device 300 controls the first branch 310 to be disconnected, thereby disconnecting the connection between the energy storage power supply module 210 and the grid 220.

[0155] Step 620, in the case that the branch state of the first branch 310 reaches the target branch state, the second branch 320 is controlled to be connected.

[0156] In this step, when the switching device 300 determines that the branch state of the first branch 310 reaches the target branch state, the switching device 300 controls the first semiconductor switch 340 to be conductive, and the input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340, thereby reducing the current impact on the first mechanical switch 330.

[0157] Step 630, in the case that the voltage across the switching device 300 is stable, the second branch 320 is controlled to be disconnected, thereby disconnecting the power supply connection between the energy storage power supply module 210 and the electrical equipment 230 and the grid 220, and the energy storage power supply module 210 supplies power to the electrical equipment 230.

[0158] In this step, when the switching device 300 detects that the voltage across the first end 350 and the second end 360 is stable, the shunt task of the first semiconductor switch 340 is completed, and the first semiconductor switch 340 can be controlled to be disconnected, thereby disconnecting the power supply connection between the energy storage power supply module 210 and the electrical equipment 230 and the grid 220.

[0159] According to the switching method of the switching device 300 provided in the embodiments of the present disclosure, by connecting the first semiconductor switch 340 and the first mechanical switch 330 in parallel in the switching device 300, when the first mechanical switch 330 is disconnected and the current change impact will cause arc drawing, the first semiconductor switch 340 is conductive, which can share the current change impact of the first mechanical switch 330, thereby avoiding arc drawing of the first mechanical switch 330 due to current change, and ensuring safe operation of the switching device 300.

[0160] In some embodiments, the switching method of the switching device 300 further includes:

[0161] In the case that the first branch 310 and the second branch 320 are both in the disconnected state, a second control instruction is received, the second branch 320 is controlled to be connected first, and then the first branch 310 is controlled to be connected, so as to turn on the power connection between the energy storage power supply module 210 and the power grid 220 and the electrical equipment 230, and the energy storage power supply module 210 and the power grid 220 supply power to the electrical equipment 230.

[0162] In this embodiment, the first semiconductor switch 340 is in the disconnected state, the first mechanical switch 330 is in the disconnected state, the first branch 310 and the second branch 320 are both in the disconnected state, the energy storage power supply module 210 is disconnected from the power grid 220, and the energy storage power supply module 210 cannot deliver electrical energy to the power grid 220, and the power grid 220 does not supply power to the electrical equipment 230.

[0163] The second control instruction is an instruction that can control the switching switch device 300 to be closed, and the second control instruction is issued in the case that the energy storage power supply module 210 is disconnected from the power grid 220 and it is determined that the state of the power grid 220 is normal.

[0164] In this embodiment, the second control instruction can be issued by the energy storage power supply module 210.

[0165] In this embodiment, when the energy storage power supply module 210 detects that the state of the power grid 220 is normal, the energy storage power supply module 210 issues a second control instruction to the switching switch device 300. After the switching switch device 300 receives the second control instruction, the first semiconductor switch 340 is controlled to be closed first, and then the first mechanical switch 330 is controlled to be closed after the voltage across the switching switch device 300 is stabilized, so as to avoid arc drawing of the first mechanical switch 330, ensure normal current flow, and thus ensure normal operation of the system.

[0166] In this embodiment, the energy storage power supply module 210 and the electrical equipment 230 are connected to the power grid 220, and the energy storage power supply module 210 and the power grid 220 supply power to the electrical equipment 230.

[0167] In some embodiments, the switching method of the switching switch device 300 further includes:

[0168] In the case that the first branch 310 and the second branch 320 are both in the connected state, a first control instruction is received, the first branch 310 is controlled to be disconnected first, and then the second branch 320 is controlled to be disconnected, so as to disconnect the power connection between the energy storage power supply module 210 and the power grid 220 and the electrical equipment 230, and the energy storage power supply module 210 supplies power to the electrical equipment 230.

[0169] In this embodiment, the first semiconductor switch 340 is in the on state, the first mechanical switch 330 is in the closed state, the first branch 310 and the second branch 320 are both in the connected state, the energy storage power supply module 210 is electrically connected with the power grid 220, and the power grid 220 can supply power to the electrical equipment 230.

[0170] In this embodiment, when the energy storage power supply module 210 detects that the state of the power grid 220 is abnormal, the energy storage power supply module 210 sends a first control instruction to the switching switch device 300. After the switching switch device 300 receives the first control instruction, the first mechanical switch 330 is first opened, and the first semiconductor switch 340 remains in the on state. The input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340, thereby reducing the current change impact of the opened first mechanical switch 330. The first semiconductor switch 340 can complete the function of sharing the current and can control the first semiconductor switch 340 to be opened.

[0171] In this embodiment, the power supply connection between the energy storage power supply module 210, the electrical equipment 230, and the power grid 220 is disconnected, and the energy storage power supply module 210 can supply power to the electrical equipment 230 alone.

[0172] The embodiments of the present disclosure also provide an energy storage system.

[0173] As shown in FIG. 7, the energy storage system includes an energy storage power supply module 210, a switching switch device 300, and a first controller 710.

[0174] As shown in FIG. 7, one end of the switching switch device 300 is connected with the energy storage power supply module 210 and the electrical equipment 230, and the other end of the switching switch device 300 is connected with the power grid 220. The switching switch device 300 is configured to switch the power supply among the energy storage power supply module 210, the electrical equipment 230, and the power grid 220.

[0175] As shown in FIG. 4, the switching switch device 300 includes a first branch 310 and a second branch 320 in parallel. The first branch 310 is provided with at least one first mechanical switch 330, and the second branch 320 is provided with at least one first semiconductor switch 340.

[0176] In this embodiment, the first controller 710 can be connected with the energy storage power supply module 210, and the first controller 710 is configured to perform the control method of the switching switch device 300 described above.

[0177] According to the energy storage system provided by the embodiment of the present disclosure, by connecting the first semiconductor switch 340 and the first mechanical switch 330 in parallel in the switching switch device 300, when the first mechanical switch 330 is disconnected and an arc is caused by the impact of current change, the first semiconductor switch 340 is turned on, the current change impact of the first mechanical switch 330 is shared, the arc caused by the current change of the first mechanical switch 330 is avoided, and the safe operation of the switching switch device 300 is ensured.

[0178] The embodiment of the present disclosure also provides a switching switch device 300 and a second controller 810.

[0179] As shown in FIG. 3, one end of the switching switch device 300 is connected with the energy storage power supply module 210 and the electrical equipment 230, the other end of the switching switch device 300 is connected with the power grid 220, and the switching switch device 300 is configured as a power supply switch between the energy storage power supply module 210, the electrical equipment 230 and the power grid 220.

[0180] As shown in FIG. 8, the switching switch device 300 includes a first branch 310 and a second branch 320 connected in parallel, the first branch 310 is provided with at least one first mechanical switch 330, and the second branch 320 is provided with at least one first semiconductor switch 340.

[0181] The switching switch device 300 further includes a second controller 810, the second controller 810 can be connected to one end of the switching switch device 300, and the second controller 810 is configured to perform the control method of the switching switch device 300 described above.

[0182] According to the switching switch device 300 provided by the embodiment of the present disclosure, by connecting the first semiconductor switch 340 and the first mechanical switch 330 in parallel in the switching switch device 300, when the first mechanical switch 330 is disconnected and an arc is caused by the impact of current change, the first semiconductor switch 340 is turned on, the current change impact of the first mechanical switch 330 is shared, the arc caused by the current change of the first mechanical switch 330 is avoided, and the safe operation of the switching switch device 300 is ensured.

[0183] In some embodiments, as shown in FIG. 5, the second branch 320 is further provided with a second mechanical switch 370, and the second mechanical switch 370 is connected in series with the first semiconductor switch 340.

[0184] In this embodiment, the second mechanical switch 370 is connected in series with the first semiconductor switch 340, and the second mechanical switch 370 can realize more flexible circuit switching, for example, in the case of failure of the first semiconductor switch 340, the connection of the second branch 320 can be disconnected through the second mechanical switch 370.

[0185] In some embodiments, as shown in FIG. 9, the electronic device 900 according to an embodiment of the present disclosure includes a processor 901, a memory 902, and a computer program stored in the memory 902 and executable on the processor 901, which, when executed by the processor 901, implements each process of the control method embodiment of the switching device 300 described above and achieves the same technical effects. For the sake of brevity, details are not repeated here.

[0186] In this embodiment, the electronic device according to an embodiment of the present disclosure includes the mobile electronic device and the non-mobile electronic device described above.

[0187] The present disclosure also provides a non-transitory computer readable storage medium having a computer program stored thereon, which, when executed by a processor, implements each process of the control method embodiment of the switching device 300 described above and achieves the same technical effects. For the sake of brevity, details are not repeated here.

[0188] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0189] The present disclosure also provides a computer program product including a computer program, which, when executed by a processor, implements the control method of the switching device 300 described above.

[0190] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0191] The present disclosure also provides a chip including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the control method embodiment of the switching device 300 described above and achieve the same technical effects. For the sake of brevity, details are not repeated here.

[0192] It should be understood that the chip mentioned in the present disclosure can also be referred to as a system-level chip, a system chip, a chip system, or a system-on-chip, etc.

[0193] In this embodiment, the terms "comprise", "contain", or any other variant thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element. In addition, it can be pointed out that the scope of the methods and apparatuses in the embodiments of the present disclosure is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0194] Through the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and a necessary general hardware platform, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present disclosure can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, or network device, etc.) execute the methods described in various embodiments of the present disclosure.

[0195] The embodiments of the present disclosure are described above in combination with the drawings, but the present disclosure is not limited to the above-mentioned specific embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms under the inspiration of the present disclosure without departing from the scope of the present disclosure and the scope protected by the claims.

[0196] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0197] Although embodiments of the disclosure have been shown and described, it will be apparent to those skilled in the art that changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for a switching device, wherein, One end of the switching device is connected to the energy storage power module and the electrical equipment, and the other end of the switching device is connected to the power grid. The switching device is configured to switch power between the energy storage power module, the electrical equipment, and the power grid. The switching device includes a first branch and a second branch connected in parallel. The first branch is provided with at least one first mechanical switch, and the second branch is provided with at least one first semiconductor switch. The method is applied to the energy storage power module, and the method includes: When the energy storage power module is electrically connected to the power grid, and the first branch is in a connected state while the second branch is in a disconnected state, if an abnormality in the power grid state is detected, the first branch is controlled to disconnect. If the branch state of the first branch is detected to have reached the target branch state, control the connection of the second branch; When the voltage across the switching device is detected to be stable, the second branch is controlled to disconnect, thereby disconnecting the power supply connection between the energy storage power module and the electrical equipment and the power grid. The energy storage power module supplies power to the electrical equipment.

2. The control method for the switching device according to claim 1, wherein, The target branch state is when the current of the first branch is greater than the disconnection current threshold.

3. The control method for the switching device according to claim 2, wherein, The branch state of the first branch reaches the target branch state, including: The duration for which the first mechanical switch is disconnected is controlled to be greater than or equal to a target duration, so that the current in the first branch is greater than the disconnection current threshold.

4. The control method for the switching device according to any one of claims 1-3, wherein, The second branch is equipped with a second mechanical switch connected in series with the first semiconductor switch. The step of controlling the second branch to disconnect when the voltage across the switching device is detected to be stable includes: First, control the first semiconductor switch of the second branch to open, and then control the second mechanical switch of the second branch to open.

5. The control method for the switching device according to any one of claims 1-4, wherein, The method further includes: When the energy storage power module is disconnected from the power grid and both the first branch and the second branch are in a disconnected state, if the power grid is detected to be in a normal state, the second branch is first controlled to connect, and then the first branch is controlled to connect, so as to connect the power supply between the energy storage power module and the electrical equipment and the power grid, and the energy storage power module and the power grid supply power to the electrical equipment.

6. The control method for the switching device according to any one of claims 1-4, wherein, The method further includes: When the energy storage power module is electrically connected to the power grid, and both the first branch and the second branch are connected, if an abnormality in the power grid is detected, the first branch is first disconnected, and then the second branch is disconnected, thereby disconnecting the power connection between the energy storage power module, the electrical equipment, and the power grid. The energy storage power module supplies power to the electrical equipment.

7. A switching method for a switching device, wherein, One end of the switching device is connected to the energy storage power module and the electrical equipment, and the other end of the switching device is connected to the power grid. The switching device is configured to switch power between the energy storage power module, the electrical equipment, and the power grid. The switching device includes a first branch and a second branch connected in parallel. The first branch is provided with at least one first mechanical switch, and the second branch is provided with at least one first semiconductor switch. The method is applied to the switching device, and the method includes: When the first branch is in a connected state and the second branch is in a disconnected state, a first control command is received to control the first branch to disconnect. The first control command is issued when the energy storage power module is electrically connected to the power grid and the power grid is determined to be in an abnormal state. If the branch state of the first branch reaches the target branch state, control the connection of the second branch; When the voltage across the switching device is stable, the second branch is controlled to disconnect, thereby disconnecting the power supply connection between the energy storage power module and the electrical equipment and the power grid. The energy storage power module supplies power to the electrical equipment.

8. The switching method of the switching device according to claim 7, wherein, The method further includes: When both the first branch and the second branch are disconnected, a second control command is received. First, the second branch is connected, and then the first branch is connected to connect the power supply between the energy storage power module and the electrical equipment and the power grid. The energy storage power module and the power grid supply power to the electrical equipment. The second control command is issued when the energy storage power module is disconnected from the power grid and the power grid is determined to be in normal condition.

9. The switching method of the switching device according to claim 7, wherein, The method further includes: When both the first branch and the second branch are connected, upon receiving the first control command, the first branch is first disconnected, and then the second branch is disconnected, thereby disconnecting the power supply connection between the energy storage power module and the electrical equipment and the power grid. The energy storage power module supplies power to the electrical equipment.

10. An energy storage system, wherein, include: Energy storage power module; A switching device is provided, one end of which is connected to the energy storage power module and the electrical equipment, and the other end of which is connected to the power grid. The switching device is configured to switch power between the energy storage power module, the electrical equipment and the power grid. The switching device includes a first branch and a second branch connected in parallel. The first branch is provided with at least one first mechanical switch and the second branch is provided with at least one first semiconductor switch. A first controller is configured to perform the control method of the switching device according to any one of claims 1-6.

11. A switching device, wherein, One end of the switching device is connected to the energy storage power module and the electrical equipment, and the other end of the switching device is connected to the power grid. The switching device is configured to switch power between the energy storage power module, the electrical equipment, and the power grid. The switching device includes: A first branch and a second branch connected in parallel, wherein the first branch is provided with at least one first mechanical switch and the second branch is provided with at least one first semiconductor switch; A second controller is configured to perform the control method of the switching device according to any one of claims 1-6.

12. The switching device according to claim 11, wherein, The second branch is also provided with a second mechanical switch, which is connected in series with the first semiconductor switch.

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