Control method, switching method and energy storage system of switching device

Abstract

This application discloses a control method, switching method, and energy storage system for a switching device, belonging to the field of electrical switch technology. One end of the switching device is connected to an energy storage power module and electrical equipment, and the other end of the switching device is connected to the power grid. The switching device includes a first branch and a second branch connected in parallel. The first branch is equipped with at least one first mechanical switch, and the second branch is equipped with at least one first semiconductor switch. The method is applied to the energy storage power module and includes: when the first branch is in a connected state and the second branch is in a disconnected state, if an abnormal power grid state is detected, controlling the first branch to disconnect; when the branch state of the first branch is detected to reach a target branch state, controlling the second branch to connect; and when the voltage across the switching device is detected to be stable, controlling the second branch to disconnect, thereby disconnecting the power connection between the energy storage power module and the electrical equipment and the power grid.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrical switch, and particularly relates to a control method of a switching switch device, a switching method and an energy storage system. BACKGROUND

[0002] For a system in which multiple energy storage power supplies are connected in parallel for power supply, the switching time of each energy storage power supply may be different, that is, the attraction and disconnection time of multiple K1s are different. Figure 2 When the switch of a certain energy storage power supply in the power supply system is attracted first in the case of load in the power supply system, 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.

[0003] At present, as shown in the prior art, Figure 2 Generally, an external switch, that is, K2 in the prior art, Figure 2 can be attracted first before multiple K1s are attracted in succession, 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 overload and sticking of the energy storage power supply and overload shutdown of the energy storage power supply.

[0004] However, the external switch is usually a mechanical switch, and when the load required current is large and the switches of multiple energy storage power supplies are attracted in succession, the external switch is switched, which may cause a large change in instantaneous current when the external switch is switched, and may cause the external switch to be arc struck and damaged. SUMMARY

[0005] The application aims to at least solve one of the technical problems in the prior art. To this end, the application provides a control method of a switching switch device, a switching method and an energy storage system, which can avoid the first mechanical switch in the first branch of the switching switch device from being arc struck and ensure the safe operation of the switching switch device.

[0006] In a first aspect, the application provides a control method of a switching switch device, one end of the switching switch device being connected with an energy storage power supply module and an electrical equipment, the other end of the switching device being connected with a power grid, the switching switch device being used for power supply switching 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, the second branch being provided with at least one first semiconductor switch, the method being applied to the energy storage power supply module, and the method comprising:

[0007] In a case where 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, and the power grid state is detected to be abnormal, the first branch is controlled to be disconnected;

[0008] In a case where the branch state of the first branch reaches a target branch state, the second branch is controlled to be connected.

[0009] In a case where the voltage across the switching switch device is stable, the second branch is controlled to be disconnected 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.

[0010] According to the control method of the switching switch device, by connecting the first semiconductor switch and the first mechanical switch in parallel in the switching switch device, when the first mechanical switch is disconnected and the current change impact will cause an arc, the first semiconductor switch is turned on to share the current change impact of the first mechanical switch, avoid the arc caused by the current change of the first mechanical switch, and ensure the safe operation of the switching switch device.

[0011] According to an embodiment of the present application, the target branch state is that the current of the first branch is greater than a disconnection current threshold.

[0012] According to an embodiment of the present application, the branch state of the first branch reaching the target branch state comprises:

[0013] The duration of controlling the first mechanical switch 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.

[0014] According to an embodiment of the present application, the second branch is provided with a second mechanical switch and the first semiconductor switch in series, and in a case where the voltage across the switching switch device is stable, the second branch is controlled to be disconnected, comprising:

[0015] 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 an embodiment of the present application, the method further comprises:

[0016] In a case where the energy storage power supply module is disconnected with the power grid, and the first branch and the second branch are both 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, 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.

[0017] According to one embodiment of the present application, the method further comprises:

[0018] In the case that the energy storage power supply module is electrically connected with the power grid, and the first branch and the second branch are both in the connected state, the abnormal state of the power grid is detected, 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 and the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment.

[0019] In the second aspect, the present application provides a switching method of a switching device, one end of the switching device is connected with an energy storage power supply module and an electrical equipment, the other end of the switching device is connected with a power grid, the switching device is used for power switching between the energy storage power supply module, the electrical equipment and the power grid, the switching 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 device, and the method comprises the following steps:

[0020] In the case that the first branch is in the connected state and the second branch is in the disconnected state, a first control instruction is received, and the first branch is controlled to be disconnected, the first control instruction is issued in the case that the energy storage power supply module is electrically connected with the power grid, and it is determined that the power grid is in an abnormal state;

[0021] In the case that the branch state of the first branch reaches a target branch state, the second branch is controlled to be connected;

[0022] In the case that the voltage at both ends of the switching 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.

[0023] According to the switching method of the switching device of the present application, by connecting the first semiconductor switch and the first mechanical switch in parallel in the switching device, when the first mechanical switch is disconnected and the current change impact will cause arc drawing, the first semiconductor switch is turned on, the current change impact of the first mechanical switch can be shared, arc drawing caused by the current change of the first mechanical switch is avoided, and the safe operation of the switching device is ensured.

[0024] According to one embodiment of the present application, the switching method of the switching device further comprises:

[0025] 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.

[0026] According to one embodiment of this application, the switching method of the switching device further includes:

[0027] 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.

[0028] Thirdly, this application provides an energy storage system, including:

[0029] Energy storage power module;

[0030] 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 used for power switching 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.

[0031] A first controller is configured to execute the control method for the switching device described in the first aspect.

[0032] According to the energy storage system of this application, by connecting the first semiconductor switch and the first mechanical switch in parallel in the switching device, when the first mechanical switch is open and the impact of current change is about to cause arcing, the first semiconductor switch is turned on, which can share the impact of current change of the first mechanical switch, avoid the first mechanical switch from arcing due to current change, and ensure the safe operation of the switching device.

[0033] Fourthly, this application provides a switching device, one end of which is connected to an energy storage power module and an electrical device, and the other end of which is connected to the power grid. The switching device is used for power switching between the energy storage power module, the electrical device, and the power grid. The switching device includes:

[0034] 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;

[0035] The second controller is used to execute the control method of the switching device described in the first aspect above.

[0036] According to the switching device of this application, the first semiconductor switch and the first mechanical switch are connected in parallel. When the first mechanical switch is open and the impact of current change is about to cause arcing, the first semiconductor switch is turned on, which can share the impact of current change of the first mechanical switch, avoid the first mechanical switch from arcing due to current change, and ensure the safe operation of the switching device.

[0037] According to one embodiment of this application, the second branch is further provided with a second mechanical switch, which is connected in series with the first semiconductor switch.

[0038] Fifthly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the switching device as described in the first aspect above.

[0039] In a sixth aspect, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the switching device as described in the first aspect above.

[0040] In a seventh aspect, this application provides a computer program product, including a computer program that, when executed by a processor, implements the control method for the switching device as described in the first aspect above.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0042] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 This is a flowchart illustrating the control method of the switching device provided in the embodiments of this application;

[0044] Figure 2 This is a schematic diagram of the structure of an energy storage system in related technologies;

[0045] Figure 3This is one of the structural schematic diagrams of the energy storage system provided in the embodiments of this application;

[0046] Figure 4 This is one of the structural schematic diagrams of the switching device provided in the embodiments of this application;

[0047] Figure 5 This is a second schematic diagram of the structure of the switching device provided in the embodiments of this application;

[0048] Figure 6 This is a schematic flowchart of the switching method of the switching device provided in the embodiments of this application;

[0049] Figure 7 This is a second schematic diagram of the energy storage system provided in the embodiments of this application;

[0050] Figure 8 This is the third schematic diagram of the switching device provided in the embodiments of this application;

[0051] Figure 9 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0052] Figure label:

[0053] Energy storage power module 210, power grid 220, electrical equipment 230, switching device 300, first branch circuit 310.

[0054] Second branch 320, first mechanical switch 330, first semiconductor switch 340, first terminal 350.

[0055] Second terminal 360, second mechanical switch 370, first controller 710, second controller 810. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0057] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0058] The control method, switching method, energy storage system, switching device, electronic device, and readable storage medium of the switching device 300 provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0059] The control method and switching method of the switching device 300 can be applied to the terminal, and can be executed by the hardware or software in the terminal.

[0060] The terminal includes, but is not limited to, portable communication devices such as mobile phones or tablets with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads). It should also be understood that, in some embodiments, the terminal may not be a portable communication device, but rather a desktop computer with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads).

[0061] The following embodiments describe a terminal including a display and a touch-sensitive surface. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, mouse, and joystick.

[0062] The control method and switching method of the switching device 300 provided in this application embodiment can be executed by an electronic device or a functional module or entity in an electronic device that can implement the control method and switching method of the switching device 300. The electronic devices mentioned in this application embodiment include, but are not limited to, mobile phones, tablet computers, computers, cameras and wearable devices. The control method and switching method of the switching device 300 provided in this application embodiment are described below using an electronic device as the execution subject.

[0063] like Figure 3As shown, one end of the switching device 300 in this embodiment is connected to the energy storage power module 210 and the electrical equipment 230, and the other end of the switching device 300 is connected to the power grid 220. The switching device 300 is used for power switching between the energy storage power module 210, the electrical equipment 230 and the power grid 220.

[0064] In this embodiment, the two ends of the switching device 300 may include a first end 350 and a second end 360. The first end 350 of the switching device 300 can be an input end, and the second end 360 of the switching device 300 can be an output end. The first end 350 of the switching device 300 is connected to the energy storage power module 210 and the electrical equipment 230, and the second end 360 of the switching device 300 is connected to the power grid 220.

[0065] Among them, the energy storage power module 210 is a device that can store electrical energy and output the stored electrical energy. The energy storage power module 210 can be an energy storage device such as a photovoltaic power source, and the output end of the energy storage power module 210 can be connected to power conversion equipment such as an inverter.

[0066] Electrical equipment 230 can include industrial electrical equipment such as machine tools, agricultural electrical equipment such as water pumps, and household appliances such as washing machines.

[0067] In this embodiment, such as Figure 3 As shown, the system may include multiple energy storage power modules 210, and the output terminal of each energy storage power module 210 may be connected to a switching device. The closing or opening time of the switching device corresponding to each energy storage power module 210 may be different.

[0068] In this embodiment, the first end 350 of the switching device 300 can be connected in parallel with multiple nodes, and each node can be connected to the switching device at the output end of the energy storage power module 210, thereby connecting to the energy storage power module 210.

[0069] like Figure 3 As shown, the first end 350 of the switching device 300 can also be connected to the electrical equipment 230, and the second end 360 of the switching device 300 is connected to the power grid 220.

[0070] In this embodiment, when the switching device 300 is closed, the electrical energy output by the energy storage power module 210 can be transmitted to the power grid 220 through the switching device 300.

[0071] In this embodiment, such as Figure 4 As shown, 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.

[0072] The switching device 300 includes a first branch 310 and a second branch 320 connected in parallel between the first end 350 and the second end 360. 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.

[0073] The first mechanical switch 330 is a switching device that controls the connection or disconnection of the circuit through physical contact or physical separation of the control components.

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

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

[0076] It should be noted that the first mechanical switch 330 may also have a manual operation interface, such as a button or a handle, which can provide emergency manual closing or opening operation when the power supply device 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 uses the conduction and cutoff characteristics of semiconductor devices to realize the switching on and off of the circuit.

[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.

[0079] It should be noted that the first semiconductor switch 340 can be a single power semiconductor device or two power semiconductor devices connected in reverse parallel.

[0080] In this embodiment, multiple mechanical switches connected in series can be provided in the first branch 310. When all mechanical switches in the first branch 310 are closed, the first branch 310 is in a connected state. When any mechanical switch in the first branch 310 is open, the first branch 310 is in a disconnected state.

[0081] The second branch 320 may be equipped with a first semiconductor switch 340 and multiple mechanical switches. When all mechanical switches in the second branch 320 are closed and the first semiconductor switch 340 is on, the second branch 320 is in a connected state. When a mechanical switch in the second branch 320 is off or the first semiconductor switch 340 is off, the second branch 320 is in a disconnected state.

[0082] It is understandable that when both the first branch 310 and the second branch 320 are in the open state, the switching device 300 is open; when both the first branch 310 and the second branch 320 are in the closed state, the switching device 300 is closed.

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

[0084] In this embodiment, the switching device 300 can be powered by the connected energy storage power module 210 or by other power supply devices, thereby realizing the switching of the switching state. The power supply method can be bilateral power supply or unilateral power supply.

[0085] The control method of the switching device 300 in this embodiment is applied to the energy storage power module 210 to control the opening or closing of the switching device 300.

[0086] The following describes the control method of the switching device 300 of this application, taking as an example that the first branch 310 of the switching device 300 is equipped with a first mechanical switch 330 and the second branch 320 is equipped with a first semiconductor switch 340.

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

[0088] Step 110: When the energy storage power module 210 is electrically connected to the power grid 220, the first branch 310 is in the connected state and the second branch 320 is in the disconnected state, and an abnormal state of the power grid 220 is detected, the first branch 310 is controlled to disconnect.

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

[0090] When the second branch 320 is in the open state, current cannot pass through the second branch 320. When the first semiconductor switch 340 is open, the second branch 320 is in the open state.

[0091] In this embodiment, when the first branch 310 is in the connected state and the second branch 320 is in the disconnected state, the energy storage power module 210 is electrically connected to the power grid 220, and the power of the energy storage power module 210 can be output to the power grid 220.

[0092] In this embodiment, a power grid status detection device can be set up. The power grid status detection device is used to determine whether the status of the power grid 220 is abnormal by detecting parameters such as the voltage of the power grid 220.

[0093] When an abnormal state of the power grid 220 is detected, the first branch 310 is disconnected, thereby disconnecting the energy storage power module 210 from the power grid 220.

[0094] When the power demand of the electrical equipment 230 is large, the connection between the energy storage power module 210 and the power grid 220 can be disconnected, and the corresponding switching devices of other energy storage power modules 210 can be closed, so that multiple energy storage power modules 210 can supply power to the electrical equipment 230.

[0095] Step 120: When the branch state of the first branch 310 is detected to have reached the target branch state, control the connection of the second branch 320.

[0096] The branch status of the first branch 310 is used to indicate the operating status of the first branch 310, which can be the current of the first branch 310, the disconnection time, etc.

[0097] The target branch state can be the state where the first mechanical switch 330 is disconnected and the disconnected first mechanical switch 330 cannot withstand the input current surge.

[0098] In this embodiment, when the first branch 310 is disconnected, the switching devices corresponding to the energy storage power module 210 are successively engaged, and the switching devices corresponding to the already engaged energy storage power module 210 may bear the current passing through the switching devices corresponding to the other energy storage power modules 210.

[0099] Moreover, during the opening of the first mechanical switch 330, the current changes significantly, causing the branch state of the first branch 310 to reach the target branch state.

[0100] When the branch state of the first branch 310 reaches the target branch state, the first semiconductor switch 340 is turned on, and the input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340 to reduce the current surge of the first mechanical switch 330.

[0101] Step 130: When the voltage across the switching device 300 is detected to be stable, the second branch 320 is controlled to disconnect, thereby disconnecting the power supply connection between the energy storage power module 210 and the electrical equipment 230 and the power grid 220. The energy storage power module 210 supplies power to the electrical equipment 230.

[0102] In this embodiment, all the switching devices of the energy storage power module 210 are closed, and multiple energy storage power modules 210 simultaneously supply power to the electrical equipment 230. The current output from the energy storage power module 210 side no longer fluctuates significantly, and the voltage across the switching device 300 is stable.

[0103] In this embodiment, the voltages at the first terminal 350 and the second terminal 360 are stable, the shunting task of the first semiconductor switch 340 is completed, and the first semiconductor switch 340 can be controlled to open, thereby disconnecting the power supply connection between the energy storage power module 210 and the electrical equipment 230 and the power grid 220.

[0104] According to the control method of the switching device 300 provided in the embodiments of this application, the first semiconductor switch 340 and the first mechanical switch 330 are connected in parallel in the switching device 300. When the first mechanical switch 330 is turned off and the impact of current change is about to cause arcing, the first semiconductor switch 340 is turned on, which can share the impact of current change of the first mechanical switch 330, avoid the first mechanical switch 330 from arcing due to current change, and ensure the safe operation of the switching device 300.

[0105] In some embodiments, the target branch state is that the current of the first branch 310 is greater than the disconnect current threshold.

[0106] The disconnection current threshold can be determined based on the magnitude of the current surge that the first mechanical switch 330 can withstand when it is disconnected. The disconnection current threshold can be less than the magnitude of the current surge that the first mechanical switch 330 can withstand.

[0107] For example, the first mechanical switch 330 can withstand a current of 25A from current change shocks, and the disconnect current threshold can be determined to be 20A.

[0108] In this embodiment, when the current in the first branch 310 is greater than the disconnect current threshold, the first semiconductor switch 340 is controlled to be turned on.

[0109] For example, the disconnect current threshold is 20A. When the current in the first branch 310 is greater than 20A, the first semiconductor switch 340 is controlled to turn on.

[0110] In actual implementation, a current detection device for the first branch 310 can be set up to determine whether the current of the first branch 310 is greater than the disconnection current threshold.

[0111] In this embodiment, when the current in the first branch 310 is greater than the disconnection current threshold, it can be assumed that the disconnected first mechanical switch 330 will be unable to withstand the impact of the input current. Controlling the first semiconductor switch 340 to conduct can share the impact current of the first mechanical switch 330, avoid arcing damage to the first mechanical switch 330, and ensure the safe operation of the switching device 300.

[0112] In some embodiments, the branch state of the first branch 310 reaches the target branch state, including:

[0113] The duration for which the first mechanical switch 330 is disconnected is greater than or equal to the target duration, so that the current in the first branch 310 is greater than the disconnection current threshold.

[0114] In this embodiment, the target duration can be determined based on the duration during which the current in the first branch 310 is greater than the disconnect current threshold.

[0115] For example, the duration for which the current in the first branch 310 is greater than the disconnect current threshold is 5 seconds, and the target duration can be determined to be 4 seconds.

[0116] In this embodiment, when the duration during which the first mechanical switch 330 is off is equal to the target duration, the first semiconductor switch 340 is turned on.

[0117] For example, if the target duration is 4 seconds, the first mechanical switch 330 is turned off for 4 seconds, and then the first semiconductor switch 340 is turned on.

[0118] In this embodiment, when the duration of the first mechanical switch 330 being off is equal to the target duration, it can be assumed that the off first mechanical switch 330 will be unable to withstand the impact of the input current. Controlling the first semiconductor switch 340 to conduct can share the impact current of the first mechanical switch 330, avoid arcing damage to the first mechanical switch 330, and ensure the safe operation of the switching device 300.

[0119] In some embodiments, such as Figure 5 As shown, the second branch 320 is equipped with a second mechanical switch 370 connected in series with the first semiconductor switch 340. When the voltage across the switching device 300 is stable, the second branch 320 is controlled to open, including:

[0120] First, control the first semiconductor switch 340 of the second branch 320 to open, and then control the second mechanical switch 370 of the second branch 320 to open.

[0121] The second mechanical switch 370 may include a component that switches between physical contact and physical separation. When the component makes physical contact, the circuit is connected, and when the component makes physical separation, the circuit is disconnected.

[0122] For example, the second mechanical switch 370 can be a contactor, a controllable circuit breaker, an electric switch, etc.

[0123] In this embodiment, the second mechanical switch 370 is connected in series with the first semiconductor switch 340. The second mechanical switch 370 can realize more flexible circuit switching. For example, if the first semiconductor switch 340 is faulty, the connection of the second branch 320 can be disconnected by the second mechanical switch 370.

[0124] In this embodiment, after controlling the first semiconductor switch 340 to open, the second mechanical switch 370 is then controlled to open. This ensures that the second branch 320 can share the current of the first branch 310, while the second mechanical switch 370 is not affected by the input current.

[0125] In this embodiment, both the first mechanical switch 330 and the second mechanical switch 370 are disconnected, which ensures that the system has sufficient safety clearance.

[0126] In some embodiments, the control method for the switching device 300 further includes:

[0127] When the energy storage power module 210 is disconnected from the power grid 220, and both the first branch 310 and the second branch 320 are in a disconnected state, if the power grid 220 is detected to be in a normal state, the second branch 320 is first controlled to connect, and then the first branch 310 is controlled to connect, so as to connect the power supply between the energy storage power module 210 and the electrical equipment 230 and the power grid 220, and the energy storage power module 210 and the power grid 220 supply power to the electrical equipment 230.

[0128] In this embodiment, the first semiconductor switch 340 is in the off state, the first mechanical switch 330 is in the off state, the first branch 310 and the second branch 320 are both in the off state, the energy storage power module 210 is disconnected from the power grid 220, the energy storage power module 210 cannot transmit power to the power grid 220, and the power grid 220 does not supply power to the electrical equipment 230.

[0129] In this embodiment, when the switching device 300 is closed, the switching devices corresponding to some of the energy storage power modules 210 can be disconnected one by one. During the process of the switching devices of each energy storage power module 210 being closed one by one, the first semiconductor switch 340 is first controlled to be turned on, which can share the impact of current change and replace the first mechanical switch 330.

[0130] In this embodiment, after all the switching devices of the energy storage power module 210 are disconnected and the output current on the energy storage power module 210 side stabilizes, the first mechanical switch 330 is controlled to close to ensure the normal flow of current and thus ensure the normal operation of the system.

[0131] In this embodiment, after the power connection between the energy storage power module 210 and the electrical device 230 and the power grid 220 is established, the energy storage power module 210 and the power grid 220 can simultaneously supply power to the electrical device 230.

[0132] It should be noted that after the first mechanical switch 330 is closed, the shunting 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.

[0133] In related technologies, peripheral switches use semiconductor switches alone. However, prolonged operation of semiconductor switches can lead to problems such as high power loss and low system efficiency.

[0134] In this embodiment, the first semiconductor switch 340 works in conjunction with the first mechanical switch 330 to share the input current with the first mechanical switch 330. After completing the current sharing task, the first semiconductor switch 340 can be disconnected to avoid power loss and device loss caused by long-term conduction, thereby improving the power transmission efficiency of the system.

[0135] In this embodiment, when the second branch 320 includes the second mechanical switch 370 connected in series with the first semiconductor switch 340, the second mechanical switch 370 is first controlled to close, and then the first semiconductor switch 340 is controlled to turn on.

[0136] In some embodiments, the control method for the switching device 300 further includes:

[0137] When the energy storage power module 210 is electrically connected to the power grid 220, and both the first branch 310 and the second branch 320 are connected, if an abnormality is detected in the power grid 220, the first branch 310 is first disconnected, and then the second branch 320 is disconnected, thereby disconnecting the power connection between the energy storage power module 210 and the electrical equipment 230 and the power grid 220. The energy storage power module 210 then supplies power to the electrical equipment 230.

[0138] In this embodiment, the first semiconductor switch 340 is in the ON state, the first mechanical switch 330 is in the OFF state, the first branch 310 and the second branch 320 are both in the OFF state, the energy storage power module 210 is electrically connected to the power grid 220, and the power grid 220 can supply power to the electrical equipment 230.

[0139] In this embodiment, when the control switching device 300 is disconnected, the switching devices of each energy storage power module 210 can be controlled to close successively. The first mechanical switch 330 is disconnected first, while the first semiconductor switch 340 remains in the conducting state. The input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340, thereby reducing the impact of current changes in the disconnected first mechanical switch 330.

[0140] In this embodiment, after all the switching devices of each energy storage power module 210 have been disconnected, the first semiconductor switch 340 completes the function of sharing the current, and can be controlled to disconnect.

[0141] In this embodiment, the power connection between the energy storage power module 210 and the electrical device 230 and the power grid 220 is disconnected, and the energy storage power module 210 can supply power to the electrical device 230 independently.

[0142] This application also provides a switching method for a switching device 300.

[0143] One end of the switching device 300 is connected to the energy storage power module 210 and the electrical equipment 230, and the other end of the switching device 300 is connected to the power grid 220. The switching device 300 is used for power switching between the energy storage power module 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.

[0144] like Figure 6 As shown, the switching method of the switching device 300 includes steps 610-630.

[0145] Step 610: When the first branch 310 is in the connected state and the second branch 320 is in the disconnected state, a first control command is received to control the first branch 310 to disconnect.

[0146] In this embodiment, when the first branch 310 is in the connected state and the second branch 320 is in the disconnected state, the energy storage power module 210 is electrically connected to the power grid 220, and the power of the energy storage power module 210 can be output to the power grid 220.

[0147] The first control command is a command that can control the switching device 300 to disconnect. The first control command is issued when the energy storage power module 210 is electrically connected to the power grid 220 and the state of the power grid 220 is determined to be abnormal.

[0148] In this embodiment, the first control command can be issued by the energy storage power module 210.

[0149] In this embodiment, the switching device 300 may include an instruction receiving device, which can acquire a first control instruction.

[0150] In actual execution, the command receiving device can obtain the first control command through wired communication such as dry contact or RS485, or wireless communication such as WiFi.

[0151] In this embodiment, when the energy storage power module 210 detects an abnormal state of the power grid 220, it sends a first control command to the switching device 300. After receiving the first control command, the switching device 300 controls the first branch 310 to disconnect, thereby disconnecting the energy storage power module 210 from the power grid 220.

[0152] Step 620: When the branch state of the first branch 310 reaches the target branch state, control the connection of the second branch 320.

[0153] In this step, when the switching device 300 determines that the branch state of the first branch 310 has reached the target branch state, it controls the first semiconductor switch 340 to be turned on, and the input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340 to reduce the current surge of the first mechanical switch 330.

[0154] Step 630: When the voltage across the switching device 300 is stable, control the second branch 320 to disconnect, thereby disconnecting the power supply connection between the energy storage power module 210 and the electrical equipment 230 and the power grid 220. The energy storage power module 210 supplies power to the electrical equipment 230.

[0155] In this step, the switching device 300 detects that the voltage at the first terminal 350 and the second terminal 360 is stable, the shunting task of the first semiconductor switch 340 is completed, and the first semiconductor switch 340 can be controlled to open, thereby disconnecting the power supply connection between the energy storage power module 210 and the electrical equipment 230 and the power grid 220.

[0156] According to the switching method of the switching device 300 provided in the embodiments of this application, the first semiconductor switch 340 and the first mechanical switch 330 are connected in parallel in the switching device 300. When the first mechanical switch 330 is turned off and the impact of current change is about to cause arcing, the first semiconductor switch 340 is turned on, which can share the impact of current change of the first mechanical switch 330, avoid the first mechanical switch 330 from arcing due to current change, and ensure the safe operation of the switching device 300.

[0157] In some embodiments, the switching method of the switching device 300 further includes:

[0158] When both the first branch 310 and the second branch 320 are disconnected, a second control command is received. First, the second branch 320 is connected, and then the first branch 310 is connected to connect the power supply between the energy storage power module 210 and the electrical equipment 230 and the power grid 220. The energy storage power module 210 and the power grid 220 supply power to the electrical equipment 230.

[0159] In this embodiment, the first semiconductor switch 340 is in the off state, the first mechanical switch 330 is in the off state, the first branch 310 and the second branch 320 are both in the off state, the energy storage power module 210 is disconnected from the power grid 220, the energy storage power module 210 cannot transmit power to the power grid 220, and the power grid 220 does not supply power to the electrical equipment 230.

[0160] The second control command is a command that can control the switching device 300 to close. The second control command is issued when the energy storage power module 210 is disconnected from the power grid 220 and the power grid 220 is determined to be in normal condition.

[0161] In this embodiment, the second control command can be issued by the energy storage power module 210.

[0162] In this embodiment, when the energy storage power module 210 detects that the grid 220 is in a normal state, it sends a second control command to the switching device 300. After receiving the second control command, the switching device 300 first controls the first semiconductor switch 340 to close. After the voltage across the switching device 300 stabilizes, it then controls the first mechanical switch 330 to close, thus preventing the first mechanical switch 330 from arcing and ensuring the normal flow of current, thereby ensuring the normal operation of the system.

[0163] In this embodiment, the energy storage power module 210 and the electrical device 230 are connected to the power grid 220, and the energy storage power module 210 and the power grid 220 supply power to the electrical device 230.

[0164] In some embodiments, the switching method of the switching device 300 further includes:

[0165] When both the first branch 310 and the second branch 320 are connected, a first control command is received. First, the first branch 310 is disconnected, and then the second branch 320 is disconnected, so as to disconnect the power connection between the energy storage power module 210 and the electrical equipment 230 and the power grid 220. The energy storage power module 210 supplies power to the electrical equipment 230.

[0166] In this embodiment, the first semiconductor switch 340 is in the ON state, the first mechanical switch 330 is in the OFF state, the first branch 310 and the second branch 320 are both in the OFF state, the energy storage power module 210 is electrically connected to the power grid 220, and the power grid 220 can supply power to the electrical equipment 230.

[0167] In this embodiment, when the energy storage power module 210 detects an abnormal state of the power grid 220, it sends a first control command to the switching device 300. After receiving the first control command, the switching device 300 first disconnects the first mechanical switch 330, while the first semiconductor switch 340 remains on. The input current of the first mechanical switch 330 can be partially distributed to the first semiconductor switch 340, reducing the impact of current changes in the disconnected first mechanical switch 330. The first semiconductor switch 340 completes the function of sharing the current, and can be controlled to disconnect.

[0168] In this embodiment, the power connection between the energy storage power module 210 and the electrical device 230 and the power grid 220 is disconnected, and the energy storage power module 210 can supply power to the electrical device 230 independently.

[0169] This application also provides an energy storage system.

[0170] like Figure 7 As shown, the energy storage system includes an energy storage power module 210, a switching device 300, and a first controller 710.

[0171] Among them, such as Figure 7 As shown, one end of the switching device 300 is connected to the energy storage power module 210 and the electrical equipment 230, and the other end of the switching device 300 is connected to the power grid 220. The switching device 300 is used for power switching between the energy storage power module 210, the electrical equipment 230 and the power grid 220.

[0172] like Figure 4 As shown, 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.

[0173] In this embodiment, the first controller 710 can be connected to the energy storage power module 210, and the first controller 710 is used to execute the control method of the switching device 300 described above.

[0174] According to the energy storage system provided in the embodiments of this application, the first semiconductor switch 340 and the first mechanical switch 330 are connected in parallel in the switching device 300. When the first mechanical switch 330 is turned off and arcing is about to occur due to the impact of current change, the first semiconductor switch 340 is turned on, which can share the impact of current change of the first mechanical switch 330, avoid the first mechanical switch 330 from arcing due to current change, and ensure the safe operation of the switching device 300.

[0175] This application also provides a switching device 300 and a second controller 810.

[0176] like Figure 3 As shown, one end of the switching device 300 is connected to the energy storage power module 210 and the electrical equipment 230, and the other end of the switching device 300 is connected to the power grid 220. The switching device 300 is used for power switching between the energy storage power module 210, the electrical equipment 230 and the power grid 220.

[0177] like Figure 8 As shown, 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.

[0178] The switching device 300 also includes a second controller 810, which can be connected to one end of the switching device 300. The second controller 810 is used to execute the control method of the switching device 300 described above.

[0179] According to the switching device 300 provided in the embodiments of this application, the first semiconductor switch 340 and the first mechanical switch 330 are connected in parallel. When the first mechanical switch 330 is turned off and arcing is about to occur due to the impact of current change, the first semiconductor switch 340 is turned on, which can share the impact of current change of the first mechanical switch 330, avoid the first mechanical switch 330 from arcing due to current change, and ensure the safe operation of the switching device 300.

[0180] In some embodiments, such as Figure 5 As shown, the second branch 320 is also provided with a second mechanical switch 370, which is connected in series with the first semiconductor switch 340.

[0181] In some embodiments, such as Figure 9As shown, this application embodiment also provides an electronic device 900, including a processor 901, a memory 902, and a computer program stored in the memory 902 and executable on the processor 901. When the program is executed by the processor 901, it implements the various processes of the control method embodiment of the switching device 300 described above and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0182] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0183] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the control method embodiment of the switching device 300 described above and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0184] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0185] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the control method of the switching device 300 described above.

[0186] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0187] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the control method embodiment of the switching device 300 described above, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0188] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0189] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0190] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0191] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0192] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0193] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method of a changeover switch device, characterized by, One end of the switch device is connected with an energy storage power supply module and an electrical equipment, the other end of the switch device is connected with a power grid, the switch device is used for power switching among the energy storage power supply module, the electrical equipment and the power grid, the switch device comprises 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 a first semiconductor switch, the method is applied to the energy storage power supply module, and the method comprises: 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 the power grid state is detected to be abnormal, the first branch is controlled to be disconnected; In the case that the branch state of the first branch reaches a target branch state, the second branch is controlled to be connected; In the case that the voltage across the switch device is detected to be stable, the second branch is controlled to be disconnected, so as to disconnect the power 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; The target branch state is that the current of the first branch is greater than a disconnection current threshold; The first branch state reaching the target branch state comprises: The duration that 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.

2. The control method of a changeover switch device according to claim 1, characterized by, 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 switch device is detected to be stable, the second branch is controlled to be disconnected, which comprises: 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.

3. The control method of a changeover switch device according to claim 1 or 2, characterized by, The method further comprises: In the case that the energy storage power supply module is disconnected with the power grid, and the first branch and the second branch are both in a disconnected state, when 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 connection between the energy storage power supply module and the electrical equipment and the power grid, and the energy storage power supply module and the power grid supply power to the electrical equipment.

4. The control method of a changeover switch device according to claim 1 or 2, characterized by The method further comprises: In the case that the energy storage power supply module is electrically connected with the power grid, and the first branch and the second branch are both in a connected state, when 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 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.

5. A switching method of a switching device, characterized by, 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 used for power supply switching among 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, the second branch is provided with one first semiconductor switch, the method is applied to the switching switch device, and the method comprises: In the case that 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 the case that the energy storage power supply module is electrically connected with the power grid and it is determined that the state of the power grid is abnormal; In the case that the branch state of the first branch reaches a target branch state, the second branch is controlled to be connected; In the case that 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 and the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment; The target branch state is that the current of the first branch is greater than a disconnection current threshold; The first branch reaches the target branch state, comprising: The duration that 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.

6. The switching method of a switching device according to claim 5, wherein Further comprising: In the case that 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 and 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 the case that the energy storage power supply module is disconnected with the power grid and it is determined that the state of the power grid is normal.

7. The switching method of a switching device according to claim 5, wherein Further comprising: In the case that 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 and the electrical equipment and the power grid, and the energy storage power supply module supplies power to the electrical equipment.

8. An energy storage system characterized by, Comprise: An energy storage power supply module; A switching switch device, one end of the switching switch device is connected with the 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 used for power supply switching among 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 one first semiconductor switch; A first controller, the first controller is used for executing the control method of the switching switch device in any one of claims 1-4.

9. A changeover switch device, characterized by One end of the switch device is connected with an energy storage power supply module and an electrical equipment, the other end of the switch device is connected with a power grid, the switch device is used for power switching among the energy storage power supply module, the electrical equipment and the power grid, and the 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 a first semiconductor switch; A second controller, the second controller is used for executing the control method of the switch device in any one of claims 1-4.

10. The switch device of claim 9, wherein The second branch is further provided with a second mechanical switch, and the second mechanical switch is connected with the first semiconductor switch in series.

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