Electrical device, electric power system, and control method

Abstract

The present application discloses an electrical device, an electric power system, and a control method. The electrical device comprises: a trip switch and a controller. The trip switch comprises a control port, a mechanical portion, and a linkage switch. The mechanical portion comprises a locking mechanism and a closing mechanism. The closing mechanism is configured to, when closed, connect a first end and a second end of the linkage switch. The controller is connected to the control port, the control port controls the locking mechanism, and the locking mechanism is connected to the closing mechanism. The control port is configured to: when receiving a closing permission signal sent by the controller, control the locking mechanism to release the closing mechanism; and when not receiving the closing permission signal sent by the controller, control the locking mechanism to lock the closing mechanism. This technical solution can still provide a protection function when the trip switch is operated in a non-standard manner.

Description

A power equipment, a power system, and a control method

[0001] This application claims priority to Chinese Patent Application No. 202510377045.9, filed on March 26, 2025, entitled "An Electric Power Equipment, Electric Power System and Control Method", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power electronics technology, specifically to a power device, a power system, and a control method. Background Technology

[0003] In order to improve safety, trip switches are usually installed in power systems. For example, trip switches are installed on the DC side of photovoltaic strings and power equipment. When a fault occurs, the trip switch opens to interrupt the fault current.

[0004] However, some related technologies may have issues with improper operation of the trip switch, which could prevent it from providing adequate protection. Summary of the Invention

[0005] In view of this, this application provides a power equipment, a power system, and a control method that can still provide protection when the trip switch is not operated correctly.

[0006] This application provides an embodiment of a power device, including: a trip switch and a controller; the trip switch includes a control port, a mechanical part, and an interlocking switch; the mechanical part includes a locking mechanism and a closing mechanism; the closing mechanism is used to connect the first and second terminals of the interlocking switch when closing; the controller is connected to the control port, the control port controls the locking mechanism, and the locking mechanism is connected to the closing mechanism; the control port is used to control the locking mechanism to release the closing mechanism when receiving a closing permission signal sent by the controller; and to control the locking mechanism to lock the closing mechanism when not receiving a closing permission signal sent by the controller.

[0007] In one possible implementation, the controller is configured to send the permission to close signal to the control port when the power equipment is operating normally and / or when a first type of fault occurs in the first device connected to the interlocking switch; and not to send the permission to close signal to the control port when a second type of fault occurs in the power equipment, wherein the severity level of the second type of fault is higher than that of the first type of fault.

[0008] In one possible implementation, the control port includes a closing enable signal terminal, which is used to receive a differential closing enable signal sent by the controller.

[0009] In one possible implementation, the control port includes a trip signal terminal, which disconnects the linkage switch when it receives a trip signal from the controller.

[0010] In one possible implementation, the trip switch further includes: a connecting rod and a knob; a first end of the connecting rod is connected to the knob, and a second end of the connecting rod is connected to the mechanical part, which is connected to the linkage switch; when the control port receives the allow closing signal, the knob is rotated, and the linkage switch closes under the action of the connecting rod.

[0011] One possible implementation further includes: an auxiliary switch and an auxiliary power supply; a first end of the auxiliary switch is used to connect to a first device, and a second end of the auxiliary switch is connected to the auxiliary power supply; when the auxiliary switch is closed, the first device supplies power to the auxiliary power supply, and the auxiliary power supply supplies power to the controller; the controller sends a closing permission signal or a tripping signal to the trip switch.

[0012] One possible implementation further includes: a reverse protection circuit; the second terminal of the auxiliary switch is connected to the auxiliary power supply through the reverse protection circuit.

[0013] One possible implementation is that the power equipment is a combiner box or an inverter.

[0014] This application embodiment also provides a power system including the power equipment described above, wherein the trip switch is connected to at least one of the DC side or AC side of the power equipment.

[0015] In one possible implementation, the power equipment is an inverter or a combiner box, and one end of the trip switch is used to connect to a photovoltaic string.

[0016] This application embodiment also provides a control method for power equipment, the power equipment including a trip switch; the method includes: in response to receiving a closing permission signal, controlling a locking mechanism in the trip switch to release a closing mechanism; when the closing mechanism is used for closing, connecting the first and second terminals of the linkage switch in the trip switch; wherein, when the closing permission signal is not received, the locking mechanism locks the closing mechanism.

[0017] In one possible implementation, the allow closing signal is received when the power equipment is operating normally and / or when the first device connected to the interlocking switch experiences a first-type fault; wherein, the allow closing signal is not received when the power equipment experiences a second-type fault; the severity level of the second-type fault is higher than that of the first-type fault.

[0018] One possible implementation also includes: controlling the linkage switch to open in response to a trip signal.

[0019] One possible implementation further includes: when the locking mechanism releases the closing mechanism, the knob of the trip switch is rotated, causing the knob to move the connecting rod and drive the closing mechanism to close.

[0020] This application also provides a control device, including a processor and a memory, wherein the memory is used to store programs, instructions or code, and the processor is used to execute the programs, instructions or code in the memory to perform the control method described above.

[0021] This application also provides a computer-readable storage medium storing a computer program, which is loaded by a processor to execute the control method described above.

[0022] The power equipment provided in this application embodiment adds control of the trip switch with a closing permission signal, and also includes a locking mechanism inside the trip switch. When the controller does not send a closing permission signal to the trip switch, the locking mechanism locks the closing mechanism, rendering both manual closing of the trip switch and automatic closing by the controller ineffective. This ensures that the trip switch will not be closed before the fault is cleared, preventing the first device from connecting to the power equipment, thereby avoiding the escalation of the fault and ensuring the safety of the power equipment. Attached Figure Description

[0023] Figure 1 is a schematic diagram of a power equipment provided in an embodiment of this application;

[0024] Figure 2 is a schematic diagram of a trip switch provided in an embodiment of this application;

[0025] Figure 3A is a schematic diagram of an inverter provided in an embodiment of this application;

[0026] Figure 3B is a schematic diagram of another inverter provided in an embodiment of this application;

[0027] Figure 4 is a schematic diagram of another inverter provided in an embodiment of this application;

[0028] Figure 5 is a schematic diagram of an anti-reverse circuit provided in an embodiment of this application;

[0029] Figure 6 is a schematic diagram of another anti-reverse circuit provided in an embodiment of this application;

[0030] Figure 7 is a schematic diagram of another inverter provided in an embodiment of this application;

[0031] Figure 8 is a schematic diagram of the connection between a controller and a control port provided in an embodiment of this application;

[0032] Figure 9 is a flowchart of a control method for an inverter provided in an embodiment of this application;

[0033] Figure 10 is a schematic diagram of a photovoltaic system provided in an embodiment of this application;

[0034] Figure 11 is a flowchart of another inverter control method provided in an embodiment of this application;

[0035] Figure 12 is a schematic diagram of a control device provided in an embodiment of this application. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] Referring to Figure 1, this figure is a schematic diagram of a power equipment provided in an embodiment of this application.

[0038] The power equipment 1000 provided in this application embodiment includes: a trip switch 11 and a controller 12. This application embodiment does not specifically limit the specific location where the trip switch 11 is connected. For example, it can be connected to the DC side of the power equipment 1000 or to the AC side, that is, the type of trip switch 11 is not limited.

[0039] For ease of understanding, the following description is based on the schematic diagram of the trip switch in Figure 2. Taking the trip switch 11 connected to the DC side of the power equipment 1000 as an example, for example, the power equipment 1000 is an inverter, and the first device connected to the DC side of the inverter is a photovoltaic string. The trip switch 11 is connected between the photovoltaic string and the DC side of the power conversion circuit in the inverter.

[0040] The trip switch 11 includes a control port A2, a mechanical part A3, a trip unit A6, and an interlock switch A1; the mechanical part A3 includes a locking mechanism and a closing mechanism. The first terminal of the interlock switch A1 is used to connect to the photovoltaic string, and the second terminal is used to connect to the downstream circuit, such as the aforementioned power conversion circuit. The trip unit A6 can be any one of a flux converter, an undervoltage trip unit, an overvoltage trip unit, or a disconnect trip unit. When the trip unit A6 is energized, the mechanical part A3 is activated.

[0041] This application does not specifically limit the number of linkage switches; the number of linkage switches can be one or more. The number of linkage switches can be equal to or unequal to the number of photovoltaic strings. The following description uses the example where the number of linkage switches is equal to the number of photovoltaic strings. For example, the number of linkage switches can be n, where n is an integer greater than or equal to 2. The n linkage switches are used to connect n photovoltaic strings. Each linkage switch corresponds one-to-one with a photovoltaic string. The positive and negative terminals of the first photovoltaic string are PV1+ and PV1-, the second photovoltaic string is PV2+ and PV2-, the third photovoltaic string is PV3+ and PV3-, and the nth photovoltaic string is PVn+ and PVn-. When the linkage switch is closed, the photovoltaic string is connected to the subsequent circuit, such as the aforementioned power conversion circuit. When the linkage switch is open, the photovoltaic string is disconnected from the subsequent circuit, such as the aforementioned power conversion circuit.

[0042] For example, each interlocking switch includes an input terminal (i.e., a first terminal) and an output terminal (i.e., a second terminal). The input terminal is connected to the positive output terminal (i.e., positive pole) or negative output terminal (i.e., negative pole) of the photovoltaic string, and the output terminal is connected to the subsequent circuit, such as a power conversion circuit. Each interlocking switch internally includes a moving contact and a stationary contact, with the moving contact mechanically connected to a connecting rod. Multiple interlocking switches are stacked along a first direction f. When the connecting rod rotates, the moving and stationary contacts inside the multiple interlocking switches close or open, realizing the connection or disconnection of the photovoltaic string with the subsequent circuit, such as the aforementioned power conversion circuit.

[0043] Controller 12 is connected to control port A2. Control port A2 controls the locking mechanism inside mechanical part A3, which is connected to the closing mechanism. The closing mechanism is used to connect the first and second terminals of the linkage switch when closing the circuit.

[0044] In addition, the trip switch also includes a connecting rod A4 and a knob A5. The trip switch can be located inside the inverter cabinet, but the knob A5 can be located on the cabinet shell and can be manually rotated.

[0045] The first end of the connecting rod A4 is connected to the knob A5, the second end of the connecting rod A4 is connected to the mechanical part A3, and the mechanical part A3 is connected to the linkage switch A1;

[0046] When control port A2 receives a closing signal from controller 12, knob A5 is rotated, and linkage switch A1 closes under the action of connecting rod A4.

[0047] It should be understood that the normal operating condition of the trip switch is manual closing by operating knob A5, and automatic disconnection by controller 12 controlling trip unit A6. Alternatively, closing the trip switch can be achieved by adding a closing signal terminal to control port A2, allowing controller 12 to directly send a closing signal to the closing signal terminal.

[0048] Control port A2 is used to control the locking mechanism to release the closing mechanism when it receives a closing permission signal sent by controller 12; and to control the locking mechanism to lock the closing mechanism when it does not receive a closing permission signal sent by controller 12.

[0049] The power equipment provided in this application includes a trip switch, which can be located inside the power equipment cabinet. The trip switch 11 generally requires manual closing, but can receive a trip signal from the controller 12 and automatically disconnect when disconnected.

[0050] Since closing the circuit breaker can be done manually, human error or non-compliance with regulations can occur, leading to problems with the power equipment. For example, when a power equipment malfunctions, the controller controls the trip switch to open. If the fault is not completely cleared, maintenance personnel may manually close the trip switch, causing the fault to escalate. Therefore, the trip switch provided in this embodiment has a locking mechanism, and the trip switch can receive a closing permission signal from the controller 12. The trip switch can only be closed manually after receiving the closing permission signal; otherwise, manual closing is invalid. This embodiment does not specifically limit the conditions under which the controller sends the closing permission signal. For example, the controller 12 itself can determine if the closing conditions are met, or the host computer can send a closing command to the controller 12, and the controller 12 sends the closing permission signal to the trip switch according to the closing command from the host computer.

[0051] The signal that allows closing can be a low-voltage signal, such as a signal below 5V, which can be directly output by the controller, or it can be a power signal, such as 12V.

[0052] The power equipment provided in this application embodiment adds control of the trip switch with a closing permission signal, and also includes a locking mechanism inside the trip switch. When the controller does not send a closing permission signal to the trip switch, the locking mechanism locks the closing mechanism, rendering both manual closing of the trip switch and automatic closing by the controller ineffective. This ensures that the trip switch will not be closed before the power equipment fault is resolved, preventing the primary equipment from connecting to downstream circuits or equipment, thus avoiding the escalation of the fault and ensuring the safety of the power equipment.

[0053] The power equipment provided in this application embodiment can be a combiner box or an inverter. When the power equipment is an inverter, the trip switch can be connected to the DC side or AC side of the inverter. Both the combiner box and the inverter may include a power conversion circuit, or the combiner box may not include a power conversion circuit. For ease of understanding, the following description uses an inverter as an example. When the inverter fails, the trip switch will trip, that is, disconnect the photovoltaic string from the power conversion circuit in the inverter. Some fault types are described below, without limiting the specific fault types. The specific fault type corresponding to the trip switch tripping or closing can be set as needed.

[0054] For example, faults can be classified into Class I faults and Class II faults based on the severity of internal and external faults in power equipment.

[0055] The impact of the first type of fault is relatively small. When on-site personnel find that the trip switch has been disconnected and then closed again, there will be no serious secondary damage or fire. For example, in the case of faults such as grounding or short circuit of the photovoltaic string, after the on-site personnel eliminate the fault, the inverter can resume normal operation when the trip switch is closed again by turning the knob on the trip switch.

[0056] The second type of fault has a greater impact. On-site personnel found that when the trip switch is closed again after it has been disconnected, serious secondary damage or fire may occur.

[0057] For example, see Figure 3A, which is a schematic diagram of an inverter provided in an embodiment of this application.

[0058] The power conversion circuit in the inverter includes a DC / DC circuit 13 and a DC / AC circuit 17. The first terminal of the DC / DC circuit 13 is connected to the trip switch 11, and the second terminal of the DC / DC circuit 13 is connected to the first terminal of the DC / AC circuit 17. Second-type faults may include, for example, faults in the DC / DC circuit 13, DC / AC circuit 17, or bus capacitor C. These faults cannot be directly eliminated by on-site personnel and require replacement or repair by professional technicians.

[0059] The controller determines whether to send a closing permission signal to the control port of the trip switch based on the fault category. The controller sends a closing permission signal to the control port when the inverter is functioning normally and / or when a first-class fault occurs in the first device connected to the trip switch; it does not send a closing permission signal to the control port when a second-class fault occurs in the inverter, where the severity level of the second-class fault is higher than that of the first-class fault.

[0060] For example, if a Type I fault occurs externally to the inverter, such as when the first device is a photovoltaic string, and the photovoltaic string experiences a Type I fault, after the trip switch opens and the fault is cleared, the controller will send a closing permission signal to the trip switch. Upon detecting this signal, the trip switch can close the circuit. If a Type II fault occurs, after the trip switch opens, the controller will not send a closing permission signal to the trip switch's control port. The trip switch cannot detect this signal and therefore cannot close the circuit.

[0061] See Figure 3B, which is a schematic diagram of another inverter provided in an embodiment of this application.

[0062] The inverter provided in this application embodiment also includes: an auxiliary switch 15 and an auxiliary power supply 14.

[0063] The first terminal of auxiliary switch 15 is used to connect to the photovoltaic string, and the second terminal of auxiliary switch 15 supplies power to auxiliary power supply 14. Generally, auxiliary switch 15 is manually closed before trip switch 11 is closed. In one implementation, auxiliary switch 15 is also connected to the second terminal of DC / DC circuit 13 via anti-reverse circuit 16, as shown in Figure 3B. When auxiliary switch 15 is closed, the photovoltaic string supplies power to bus capacitor C through auxiliary switch 15 and anti-reverse circuit 16. Auxiliary power supply 14 draws power from bus capacitor C, thereby supplying power to controller 12. That is, auxiliary power supply 14 draws power from the photovoltaic string through anti-reverse circuit 16 and auxiliary switch 15. Controller 12 sends a closing permission signal or a trip signal to trip switch 11.

[0064] In another implementation, as shown in Figure 4, the auxiliary switch 15 is also connected to the first terminal of the DC / DC circuit 13 via the anti-reverse circuit 16. After the auxiliary switch 15 is closed, the photovoltaic string supplies power to the DC / DC circuit 13. After conversion by the DC / DC circuit 13, power is supplied to the bus capacitor C. The auxiliary power supply 14 draws power from the bus capacitor C, that is, the auxiliary power supply 14 supplies power to the controller 12. The power supply method provided in this embodiment can directly or indirectly supply power to the auxiliary power supply 14. When the auxiliary power supply 14 has power, it supplies power to the controller 12, thus diversifying the power supply methods.

[0065] The function of the reverse polarity protection circuit 16 is to prevent reverse current from flowing into the inverter after the photovoltaic strings connected to the auxiliary switch 15 are reverse-connected and the auxiliary switch 15 is closed, which could damage the inverter or prevent the inverter controller from receiving power. The specific form of the reverse polarity protection circuit 16 is not limited. This application embodiment illustrates two types shown in Figures 5 and 6. The reverse polarity protection circuit 16 shown in Figure 5 includes two diodes, while the reverse polarity protection circuit 16 shown in Figure 6 includes four diodes forming a full-bridge circuit. During inverter operation, multiple photovoltaic strings are connected to the DC side of the inverter. First, the auxiliary switch 15 is closed. If a photovoltaic string connected to the auxiliary switch 15 is reverse-connected, as shown in Figure 5, the controller 12 will not be powered on. In this case, the positive and negative terminals of the photovoltaic strings need to be swapped before closing the auxiliary switch 15 again. The reverse polarity protection circuit 16 shown in Figure 6 can also supply power to the controller 12 when a photovoltaic string connected to the auxiliary switch 15 is reverse-connected. After the controller 12 is powered on, the trip switch 11 receives the signal to allow closing and closes the trip switch 11. At this time, the controller 12 will first check whether there is a fault signal. If there is no fault signal, it will operate normally, such as the inverter operating in grid connection. If there is a fault signal, the controller 12 will send a trip signal, the trip switch 11 will trip, and the system will restart after troubleshooting.

[0066] The inverter described above uses a power conversion circuit that includes a series-connected DC / DC circuit and a DC / AC circuit as an example. It should be understood that the power conversion circuit in an inverter can also be a single-stage circuit, that is, it only includes a DC / AC circuit. See Figure 7, which is a schematic diagram of another inverter provided in an embodiment of this application.

[0067] The second terminal of the auxiliary switch 15 is connected to the DC side of the DC / AC circuit 17 via the anti-reverse circuit 16. The working principle of the trip switch 11 is the same as that described in the above embodiments, and will not be repeated here.

[0068] The power equipment described in the above embodiments uses an inverter as an example. When the power equipment is a combiner box, the combiner box may or may not include a power conversion circuit. For example, when the combiner box includes a power conversion circuit, the power conversion circuit may include a DC / DC circuit. The first terminal of the linkage switch is connected to the photovoltaic string, the second terminal of the linkage switch is connected to the first terminal of the DC / DC circuit, and the second terminal of the DC / DC circuit is connected to the inverter. The inverter includes a DC / AC circuit.

[0069] The specific implementation of the control port in the trip switch provided in the embodiments of this application is described below with reference to the accompanying drawings.

[0070] Referring to Figure 8, this figure is a schematic diagram of the connection between a controller and a control port provided in an embodiment of this application.

[0071] The inverter provided in this application embodiment includes a trip signal terminal on control port A2. This application does not limit the number of terminals on control port A2 that receive the trip signal. For example, one possible implementation is that the trip signal is implemented using differential signals, namely S1+ and S1-. When the trip signal terminal receives the trip signal sent by controller 12, the interlock switch is opened. S1+ and S1- are a pair of differential signals. Differential signals have strong anti-interference capabilities, which is beneficial for control port A2 to receive the correct trip signal.

[0072] Control port A2 includes a closing enable signal terminal. This application does not limit the number of terminals on control port A2 that receive the closing enable signal. For example, one possible implementation is that the closing enable signal is implemented using differential signals, S2+ and S2-. The closing enable signal terminal is used to receive the differential closing enable signal sent by controller 12. S2+ and S2- are a pair of differential signals. Differential signals have strong anti-interference capabilities, which is beneficial for control port A2 to receive the correct closing enable signal.

[0073] The following section uses power equipment as an example to illustrate the working principle of the inverter provided in this application embodiment, combined with the workflow.

[0074] Referring to Figure 9, this figure is a flowchart of a control method for an inverter provided in an embodiment of this application.

[0075] S901: Close the auxiliary switch to power on the controller. After the auxiliary switch is closed, the auxiliary power supply is supplied by the photovoltaic string. Therefore, once the auxiliary power supply is powered, it supplies power to the controller, and the controller can operate.

[0076] S902 is not a necessary step; it can be omitted, meaning S901 can directly execute S903. Even if S902 exists, it must be executed before S901 can be executed.

[0077] S902: The trip switch is closed, but the trip switch does not detect a closing permission signal. For example, the knob can be turned, but if the trip switch does not detect a closing permission signal, the trip switch cannot be closed even if the knob can be turned. Another situation is that the knob cannot be turned when the trip switch does not detect a closing permission signal.

[0078] Before the trip switch is closed, the auxiliary switch is not yet closed, and the controller is not powered on. Therefore, the trip switch will not receive a closing permission signal. Proper operation requires closing the auxiliary switch first, powering on the controller, and then closing the trip switch.

[0079] S903: A closing permission signal is detected, and the trip switch is closed. Closing at this time can be done manually via a rotary knob. It should be understood that, for ease of operation, when a closing permission signal is not detected, an indicator light or display screen in the inverter cabinet can be used to indicate that the trip switch cannot be closed.

[0080] S904: If a fault such as reverse connection or short circuit is detected, execute S905; otherwise, execute S906.

[0081] S905: The controller sends a trip signal, the trip switch trips, that is, the connection between the photovoltaic string and the power conversion circuit is disconnected.

[0082] S906: The inverter is operating normally.

[0083] S907: Troubleshooting. After troubleshooting, the auxiliary switch still needs to be closed first, i.e., return to S901.

[0084] Based on the power equipment provided in the above embodiments, this application also provides a photovoltaic system, which will be described in detail below with reference to the accompanying drawings.

[0085] Referring to Figure 10, this figure is a schematic diagram of a photovoltaic system provided in an embodiment of this application.

[0086] The photovoltaic system provided in this application includes the power equipment 1000 described in the above embodiments.

[0087] The DC side of the power equipment 1000 is connected to a photovoltaic string PV.

[0088] The power equipment 1000 includes a trip switch, which is connected to at least one of the DC or AC sides of the power equipment 1000. The controller of the power equipment provided in this embodiment can send a closing permission signal to the trip switch, and the trip switch is equipped with a locking mechanism. When no closing permission signal is received, the locking mechanism will not allow the trip switch to close, thus preventing human error and the expansion of the fault range.

[0089] Based on the power equipment and photovoltaic system provided in the above embodiments, this application also provides a control method for the power equipment, which will be described in detail below with reference to the accompanying drawings.

[0090] Referring to Figure 11, this figure is a flowchart of a control method for power equipment provided in an embodiment of this application.

[0091] The present application provides a control method for power equipment, wherein the power equipment includes a trip switch.

[0092] The method includes:

[0093] S1101: In response to receiving a closing permission signal, the locking mechanism in the trip switch is controlled to release the closing mechanism; the function of the closing mechanism is to connect the first and second terminals of the linkage switch in the trip switch when closing.

[0094] S1102: When no closing signal is received, the locking mechanism in the trip switch locks the closing mechanism.

[0095] It should be understood that there is no sequential relationship between S1101 and S1102.

[0096] The power equipment provided in this application embodiment adds control of the trip switch with a closing permission signal, and also includes a locking mechanism inside the trip switch. When the controller does not send a closing permission signal to the trip switch, the locking mechanism locks the closing mechanism, rendering both manual closing of the trip switch and automatic closing by the controller ineffective. This ensures that the trip switch will not be closed before the fault is cleared, preventing the first device from connecting to the power equipment, avoiding the escalation of the fault, and ensuring the safety of the power equipment.

[0097] One possible implementation, the control method provided in this application embodiment, is that the allow closing signal is received when a first type of fault occurs in the first device that is normally connected to the power equipment and / or the interlocking switch; the allow closing signal is not received when a second type of fault occurs in the power equipment, wherein the severity level of the second type of fault is higher than that of the first type of fault.

[0098] One possible implementation, the control method provided in this application embodiment, further includes: controlling the linkage switch to disconnect in response to a trip signal.

[0099] One possible implementation, the control method provided in this application embodiment, further includes: when the locking mechanism releases the closing mechanism, when the knob of the trip switch is rotated, the knob drives the connecting rod to move, thereby driving the closing mechanism to close.

[0100] In one possible implementation, see Figure 12, which is a schematic diagram of a control device provided in an embodiment of this application.

[0101] The control device may include a memory 1011 and a processor 1012. The processor 1012 can be connected to the power equipment. When the power equipment includes power conversion circuits, the processor 1012 can drive the switches in each power conversion circuit of the power equipment, as well as the aforementioned control of the disconnect switches. As shown in Figure 12, the memory may be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (Electronic Programmable ROM), registers, hard disk, removable disk, etc.

[0102] The memory 1011 can store computer instructions. When the computer instructions stored in the memory 1011 are executed by the processor 1012, the processor 1012 can be used to execute control methods for the power equipment. The memory 1011 can also store data, such as fault information involved in the above embodiments.

[0103] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape) or a semiconductor medium (e.g., solid-state disk (SSD)).

[0104] This application also provides a readable storage medium for storing the methods provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disks, removable disks, or any other form of storage medium in the art.

[0105] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0106] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrical device, characterized in that, include: Trip switches and controllers; The trip switch includes a control port, a mechanical part, and a linkage switch; the mechanical part includes a locking mechanism and a closing mechanism. The closing mechanism is used to connect the first and second terminals of the linkage switch when closing the circuit. The controller is connected to the control port, the control port controls the locking mechanism, and the locking mechanism is connected to the closing mechanism; The control port is used to control the locking mechanism to release the closing mechanism when it receives a closing permission signal sent by the controller; and to control the locking mechanism to lock the closing mechanism when it does not receive a closing permission signal sent by the controller.

2. The power equipment according to claim 1, characterized in that, The controller is configured to send the permission to close signal to the control port when the power equipment is operating normally and / or when a first type of fault occurs in the first device connected to the interlocking switch; and not to send the permission to close signal to the control port when a second type of fault occurs in the power equipment, wherein the severity level of the second type of fault is higher than that of the first type of fault.

3. The power equipment according to claim 1, characterized in that, The control port includes a closing enable signal terminal, which is used to receive a differential closing enable signal sent by the controller.

4. The power equipment according to any one of claims 1-3, characterized in that, The control port includes a trip signal terminal. When the trip signal terminal receives a trip signal sent by the controller, the linkage switch is disconnected.

5. The power equipment according to claim 4, characterized in that, The trip switch also includes: a connecting rod and a knob; The first end of the connecting rod is connected to the knob, the second end of the connecting rod is connected to the mechanical part, and the mechanical part is connected to the linkage switch; When the control port receives the signal to allow closing, the knob is rotated, and the linkage switch closes under the action of the connecting rod.

6. The power equipment according to any one of claims 1-3, characterized in that, Also includes: Auxiliary switches and auxiliary power supplies; The first end of the auxiliary switch is used to connect to the first device, and the second end of the auxiliary switch is connected to the auxiliary power supply; When the auxiliary switch is closed, the first device supplies power to the auxiliary power supply, and the auxiliary power supply supplies power to the controller; the controller sends a closing permission signal or a tripping signal to the trip switch.

7. The power equipment according to claim 6, characterized in that, Also includes: Anti-reverse circuit; the second terminal of the auxiliary switch is connected to the auxiliary power supply through the anti-reverse circuit.

8. The power equipment according to any one of claims 1-3, characterized in that, The power equipment is a combiner box or an inverter.

9. An electric power system, characterized in that, The power equipment includes any one of claims 1-8, wherein the trip switch is connected to at least one of the DC side or AC side of the power equipment.

10. The power system according to claim 9, characterized in that, The power equipment is an inverter or a combiner box, and one end of the trip switch is used to connect to the photovoltaic string.

11. A control method for electrical equipment, characterized in that, The power equipment includes a trip switch; The method includes: In response to receiving a closing permission signal, the locking mechanism in the trip switch is controlled to release the closing mechanism; when the closing mechanism is used for closing, the first and second terminals of the linkage switch in the trip switch are connected; wherein, when the closing permission signal is not received, the locking mechanism locks the closing mechanism.

12. The method according to claim 11, characterized in that, The permission to close signal is received when the power equipment is operating normally and / or when the first device connected to the interlocking switch experiences a first-type fault; wherein, the permission to close signal is not received when the power equipment experiences a second-type fault; the severity level of the second-type fault is higher than that of the first-type fault.

13. The method according to claim 11, characterized in that, Also includes: In response to the trip signal, the linkage switch is controlled to open.

14. The method according to any one of claims 11-13, characterized in that, Also includes: When the locking mechanism releases the closing mechanism, the knob of the trip switch is rotated, which drives the connecting rod to move and drive the closing mechanism to close.

15. A control device, characterized in that, It includes a processor and a memory, the memory being used to store programs, instructions, or code, and the processor being used to execute the programs, instructions, or code in the memory to perform the control method as described in claims 11-14.

16. A computer-readable storage medium, characterized in that, The system contains a computer program that is loaded by a processor to execute the control method as described in any one of claims 11-14.

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