Control method based on circuit breaker and circuit breaker

Abstract

The invention provides a control method based on a circuit breaker and the circuit breaker, and relates to the technical field of low-voltage electric appliances. The control method comprises the following steps: receiving a system opening instruction sent by a grid-connected and off-grid system; according to the system opening instruction, after a handle gear in the circuit breaker is controlled to move from a closing position to an opening position, a driving gear in the circuit breaker is controlled to move from an unlocking position to a locking position; when the driving gear is in the locking position, acquiring an unlocking instruction generated by an unlocking key in the circuit breaker; the driving gear is controlled to move from the locking position to the unlocking position according to the unlocking instruction, when the driving gear is located at the unlocking position, the circuit breaker support is switched from the opening state to the closing state through the body handle, and after the control handle gear moves from the closing position to the opening position, the opening state is switched to the closing state through the body handle. The driving gear can be controlled to move from the unlocking position to the locking position, manual closing operation is prohibited, and the situation that power grid impact caused by local false closing seriously threatens personnel life safety and equipment stable operation is avoided.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and in particular to a control method and circuit breaker based on a circuit breaker. Background Technology

[0002] Grid-connected and off-grid systems, also known as hybrid photovoltaic energy storage systems or integrated grid-connected and off-grid systems, are advanced energy systems that intelligently combine solar photovoltaic power generation, energy storage batteries, the public power grid, and loads. Their core characteristics are: they can connect to the power grid like a grid-connected system to exchange power; and they can also operate independently like an off-grid system when the grid is down, providing uninterrupted power to designated loads.

[0003] In existing technologies, the operation and maintenance of grid-connected and off-grid systems mainly rely on the operation of on-site maintenance personnel, especially the control of critical equipment such as circuit breakers. Typically, on-site maintenance personnel need to manually operate the circuit breakers to switch between grid-connected and off-grid states according to dispatch instructions or on-site conditions.

[0004] However, in actual operation, there may be instances where maintenance personnel fail to strictly follow operating procedures, misoperate, or intentionally violate regulations when operating circuit breakers. Therefore, the existing parallel and off-grid systems have significant security vulnerabilities. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a control method and circuit breaker based on a circuit breaker. This method enables the circuit breaker to switch to the open state according to the system's opening command, and further drives the gear assembly to move to the locked position to prevent manual closing. This avoids the serious threat to personnel safety and stable equipment operation caused by local accidental closing of the power grid.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, the present invention provides a control method based on a circuit breaker, applied to a controller in a circuit breaker, the control method comprising: Receive and disconnect system tripping commands sent by the off-grid system; According to the system tripping command, after controlling the handle gear in the circuit breaker to move from the closed position to the tripping position, the drive gear in the circuit breaker is controlled to move from the unlocked position to the locked position. When the drive gear is in the locked position, the circuit breaker uses a mechanical limit to prevent the main handle from driving the handle gear to move towards the closed position to prohibit manual closing. When the drive gear is in the locked position, the unlock command generated by the unlock button in the circuit breaker is obtained; The drive gear is controlled to move from the locked position to the unlocked position according to the unlocking command. When the drive gear is in the unlocked position, the circuit breaker supports switching from the open state to the closed state via the main handle.

[0007] In an optional implementation, after controlling the drive gear to move from the locked position to the unlocked position according to the unlocking command, the method further includes: When the drive gear is in the unlocked position, the handle gear is driven by the main body handle to move from the open position to the closed position.

[0008] In an optional implementation, after controlling the drive gear in the circuit breaker to move from the unlocked position to the locked position, the method further includes: When the drive gear is in the locked position, the system closes the circuit breaker command sent by the grid-connected system through a digital input interface or a remote communication interface. According to the system closing command, the drive gear is controlled to move from the locked position to the unlocked position, and the handle gear is driven by the drive gear to move from the open position to the closed position.

[0009] In an optional implementation, after controlling the drive gear to move from the locked position to the unlocked position according to the system closing command, and driving the handle gear to move from the open position to the closed position via the drive gear, the method further includes: The handle gear is driven by the main handle to move from the closed position to the open position.

[0010] In an optional implementation, after controlling the drive gear to move from the locked position to the unlocked position according to the unlocking command, the method further includes: Obtain the locking command generated by the locking button in the circuit breaker; According to the locking command, the drive gear is controlled to move from the unlocked position to the locked position.

[0011] In an optional embodiment, the handle gear is provided with a first detection unit at the closed position and the open position, and the drive gear is provided with a second detection unit at the locked position and the unlocked position. The first detection unit and the second detection unit are electrically connected to the controller. The first detection unit and the second detection unit include at least one of the following: a micro switch and a Hall element. The controller is used to determine the position of the handle gear based on the detection signals of each of the first detection units, and to determine the position of the drive gear based on the detection signals of each of the second detection units.

[0012] In an optional implementation, the method further includes: The first voltage signal and the second voltage signal on the incoming side and the outgoing side of the circuit breaker are collected respectively; Calculate the target voltage difference between the second voltage signal and the first voltage signal; The wear degree of the contact group in the circuit breaker is determined based on the target voltage difference.

[0013] In an optional implementation, after calculating the target voltage difference between the second voltage signal and the first voltage signal, the method further includes: Acquire the detection signal collected by the detection unit at the opening position; Based on the detection signal and the target voltage difference, it is determined whether the circuit breaker has successfully tripped.

[0014] In an optional embodiment, the circuit breaker further includes a digital output interface, and a contact status detection unit is provided at the contact position in the circuit breaker; The controller detects the opening and closing status of the circuit breaker through the contact status detection unit, and sends the opening and closing status of the circuit breaker to the grid-connected system through the digital output interface.

[0015] In a second aspect, the present invention provides a circuit breaker, the circuit breaker comprising: a controller, a motor, an unlocking button, a trip unit, a body handle, a handle gear, and a drive gear; The motor, the unlock button, and the trip unit are electrically connected to the controller. The trip unit is driven by the main handle. The main handle is driven by the handle gear. The drive gear is driven by the motor. The controller is used to execute the circuit breaker-based control method described in any of the foregoing embodiments.

[0016] The beneficial effects of this application are: The control method and circuit breaker based on the embodiment of this application include: receiving and sending a system tripping command from the off-grid system; according to the system tripping command, controlling the handle gear in the circuit breaker to move from the closed position to the open position, and then controlling the drive gear in the circuit breaker to move from the unlocked position to the locked position, wherein when the drive gear is in the locked position, the circuit breaker uses a mechanical limit to prevent the main handle from driving the handle gear to move towards the closed position to prohibit manual closing; when the drive gear is in the locked position, obtaining an unlocking command generated by the unlocking button in the circuit breaker; and controlling the drive gear to move from the locked position to the unlocked position according to the unlocking command, wherein when the drive gear is in the unlocked position, the circuit breaker supports switching from the open state to the closed state via the main handle. By applying this embodiment, after the circuit breaker controls the handle gear to move from the closed position to the open position according to the system tripping command, it can control the drive gear to move from the unlocked position to the locked position, thereby prohibiting manual closing operations and avoiding serious threats to personnel safety and equipment stability caused by local accidental closing of the power grid. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This application provides a schematic diagram of the structure of a parallel-to-offline system; Figure 2 A schematic flowchart illustrating a circuit breaker-based control method provided in an embodiment of this application; Figure 3 A flowchart illustrating another control method based on a circuit breaker provided in this application embodiment; Figure 4 A flowchart illustrating another control method based on a circuit breaker provided in this application embodiment; Figure 5 A flowchart illustrating another control method based on a circuit breaker provided in this application embodiment; Figure 6 This is a flowchart illustrating another control method based on a circuit breaker provided in an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In related technologies, the operation and maintenance of grid-connected and off-grid systems mainly rely on the operation of on-site maintenance personnel, especially the control of critical equipment such as circuit breakers. Typically, on-site maintenance personnel need to manually operate the circuit breakers to switch between grid-connected and off-grid states based on dispatch instructions or on-site conditions.

[0023] However, in actual operation, there may be instances where maintenance personnel fail to strictly follow operating procedures, misoperate, or intentionally violate regulations when operating circuit breakers. Therefore, the existing parallel and off-grid systems have significant security vulnerabilities.

[0024] In view of this, the present application provides a control method based on a circuit breaker, which enables the circuit breaker to switch to the open state according to the system opening command, and can further drive the gear assembly to move to the locked position to prevent manual closing, so as to avoid the serious threat to personnel life safety and equipment stable operation caused by local accidental closing of the power grid.

[0025] Figure 1 A schematic diagram of a parallel-to-offline system provided in this application is shown below. Figure 1 As shown, the embodiments of this application are applied to a grid-connected and off-grid system that includes photovoltaic equipment, which may include multiple sets of grid subsystems, each of which may be a power supply system for a power supply area such as a household or factory.

[0026] For example, each power grid subsystem includes: a circuit breaker, an inverter, and photovoltaic equipment as provided in the embodiments of this application. The photovoltaic equipment can be a photovoltaic array composed of photovoltaic panels, or it can be photovoltaic equipment (photovoltaic panels) used as a unit of the smallest power supply unit (e.g., a household), and there is no limitation here.

[0027] One end of the circuit breaker is connected to the power grid, and the other end is connected to one end of the inverter, which in turn is connected to the aforementioned photovoltaic equipment. Additionally, the area between the inverter and the circuit breaker is used to connect a load, such as... Figure 1 As shown, one or more loads can be connected between the circuit breaker and the inverter. It should be noted that the connection between the circuit breaker and the inverter can be wired or wireless, and there is no restriction on this.

[0028] For example, the inverter and the circuit breaker can also be connected via a bus (CAN) or through an interface corresponding to other communication protocols, without any restrictions.

[0029] In the aforementioned scenarios involving photovoltaic (PV) equipment, the inverter can be a PV inverter. In practice, the PV equipment can supply power to the load connected to the inverter, and the inverter converts the solar energy generated by the PV equipment into electrical energy to supply the load. When the PV equipment is insufficient to power the load, the inverter and circuit breaker switch the power supply to the grid. Conversely, when the grid is insufficient to power the load, for example, when the incoming voltage on the grid side is too low, the power supply switches to the PV equipment.

[0030] In some embodiments, before introducing this application, a circuit breaker is first briefly described. The circuit breaker may include: a controller, a motor, an unlock button, a trip unit, a main handle, a handle gear, and a drive gear. The motor, unlock button, and trip unit are electrically connected to the controller, the trip unit is drive-connected to the main handle, the main handle is drive-connected to the handle gear, and the drive gear is drive-connected to the motor. The controller is used to execute the circuit breaker-based control method provided in this application.

[0031] To better understand this application, the working principle of the circuit breaker will first be explained: Optionally, during the system tripping process, the controller can control the trip unit to operate according to the system tripping command. The trip unit can drive the main handle to the tripping position. The main handle can drive the handle gear from the closing position to the tripping position. After the controller detects that the handle gear has moved to the tripping position, it can drive the drive gear from the unlocking position to the locking position through the motor.

[0032] During the system closing process, the controller can control the drive gear to move from the locked position to the unlocked position according to the system closing command, and drive the handle gear to move from the open position to the closed position through the drive gear.

[0033] Optionally, during manual tripping, when the drive gear is in the unlocked position, the handle gear can be moved from the closed position to the tripping position by the main body handle; during manual closing, when the drive gear is in the unlocked position, the handle gear can be moved from the tripping position to the closing position by the main body handle.

[0034] Figure 2 This application provides a flowchart illustrating a circuit breaker-based control method, wherein, as shown in the embodiments thereof... Figure 1 As shown, the circuit breaker can be located between the inverter and the power grid, and this method can be applied to the controller within the circuit breaker. Optionally, based on the structure of the circuit breaker described above, as... Figure 2 As shown, the control method includes: S101, Receive and disconnect the system tripping command sent by the off-grid system.

[0035] Alternatively, see the above. Figure 1 As shown, when the circuit breaker is in the closed state, the system tripping command can be generated by the inverter in the grid-connected system and sent to the circuit breaker. In some implementations, the inverter can generate the system tripping command and send it to the controller in the circuit breaker when it determines that the incoming voltage on the grid side meets the off-grid conditions. Specifically, the system tripping command can be sent by the circuit breaker to the controller in the circuit breaker through a digital interface, communication interface, etc.

[0036] For example, the inverter can generate a system trip command when it determines that the grid side is insufficient to supply power to the load. Specifically, if the grid-side incoming voltage is less than a preset voltage threshold, it indicates that the grid side is insufficient to supply power to the load, requiring off-grid operation. In this case, a system trip command can be generated.

[0037] S102. According to the system tripping command, after controlling the handle gear in the circuit breaker to move from the closed position to the tripping position, control the drive gear in the circuit breaker to move from the unlocked position to the locked position.

[0038] When the handle gear is in the open or closed position, the circuit breaker is in the open or closed state; when the drive gear is in the locked position, the circuit breaker uses a mechanical limit to prevent the handle gear from moving to the closed position to prohibit manual closing, but it supports switching to the closed state according to the system closing command sent by the digital input interface or remote communication interface.

[0039] Optionally, based on the circuit breaker's opening and closing status, the position of the handle gear when the circuit breaker is in the closed state is recorded as the closed position; the position of the handle gear when the circuit breaker is in the open state is recorded as the open position; when the circuit breaker supports remote communication closing and digital interface closing, and prohibits manual closing, the position of the drive gear is recorded as the locked position, and the state of the circuit breaker is recorded as the locked state; when the circuit breaker supports manual closing, prohibits remote communication closing and digital interface closing, the position of the drive gear is recorded as the unlocked position, and the state of the circuit breaker is recorded as the unlocked state.

[0040] Upon receiving a system tripping command, the controller can control the handle gear in the circuit breaker to move from the closed position to the open position. Optionally, the open position of the handle gear can be equipped with a first detection unit, and the controller is electrically connected to this first detection unit. If the controller determines through the first detection unit that the handle gear is in the open position, it can drive the drive gear from the unlocked position to the locked position via a motor. In some embodiments, the drive gear in the locked position can be configured to form a mechanical limit barrier on the movement path of the main handle for manual closing to prevent accidental manual closing.

[0041] S103. When the drive gear is in the locked position, obtain the unlock command generated by the unlock button in the circuit breaker.

[0042] Optionally, when the drive gear is in the locked position, the user can press the unlock button in the circuit breaker, which will generate an unlock command and send it to the controller.

[0043] S104. Control the drive gear to move from the locked position to the unlocked position according to the unlock command.

[0044] When the drive gear is in the unlocked position, the circuit breaker supports switching from the open state to the closed state via the main handle.

[0045] After receiving the unlock command, the controller can control the drive gear to move from the locked position to the unlocked position. In the unlocked position, the circuit breaker supports manual closing, remote communication-disabled closing, and digital interface closing.

[0046] Understandably, if the user wants to close the circuit breaker, they can move the main handle to the closed position, which will move the handle gear from the open position to the closed position, thus switching the circuit breaker from the open to the closed state. In some implementations, after pressing the unlock button, the motor will control the drive gear to move from the unlocked position to the locked position. When the drive gear is in the unlocked position, the user can use the main handle to move the handle gear from the open position to the closed position, thus performing a manual closing operation after unlocking.

[0047] By applying the embodiments of this application, after the circuit breaker controls the handle gear in the circuit breaker to move from the closed position to the open position according to the system's tripping command, it can control the drive gear in the circuit breaker to move from the unlocked position to the locked position, thereby prohibiting manual closing operations and avoiding serious threats to personnel safety and equipment stability caused by local accidental closing of the power grid. When it is confirmed that manual closing is required, the drive gear can be controlled to move from the locked position to the unlocked position, and the circuit breaker can be switched to the closed state by manual closing, which can improve the safety of closing operations and improve the reliability of the grid connection and disconnection system.

[0048] In summary, this application provides a control method based on a circuit breaker, applied to a controller within the circuit breaker. The method includes: receiving and transmitting a system tripping command from the off-grid system; according to the system tripping command, controlling the handle gear in the circuit breaker to move from the closed position to the open position, and then controlling the drive gear in the circuit breaker to move from the unlocked position to the locked position. When the drive gear is in the locked position, the circuit breaker uses a mechanical limit to prevent the handle from moving towards the closed position, thus prohibiting manual closing; when the drive gear is in the locked position, acquiring an unlocking command generated by the unlock button in the circuit breaker; and according to the unlocking command, controlling the drive gear to move from the locked position to the unlocked position. When the drive gear is in the unlocked position, the circuit breaker supports switching from the open state to the closed state via the handle. By applying this application, after the circuit breaker controls the handle gear to move from the closed position to the open position according to the system tripping command, it can control the drive gear to move from the unlocked position to the locked position, thereby prohibiting manual closing operations and preventing serious threats to personnel safety and equipment stability caused by accidental local closing due to grid impact.

[0049] Figure 3 This is a flowchart illustrating another circuit breaker-based control method provided in an embodiment of this application. In optional implementations, such as... Figure 3 As shown, after controlling the drive gear to move from the locked position to the unlocked position according to the unlock command, the process also includes: S301. When the drive gear is in the unlocked position, the handle gear is driven by the main body handle to move from the open position to the closed position.

[0050] When the drive gear is in the unlocked position, it means that manual closing is allowed. Optionally, the main handle can be moved to the closing position, and the handle gear can be moved from the open position to the closing position. This enables manual closing when the drive gear is in the unlocked position. The circuit breaker can be switched to the closed state by the main handle, which can improve the applicability of the circuit breaker.

[0051] Figure 4This is a flowchart illustrating another circuit breaker-based control method provided in an embodiment of this application. In optional implementations, such as... Figure 4 As shown, after the drive gear in the above-mentioned control circuit breaker moves from the unlocked position to the locked position, it also includes: S401. When the drive gear is in the locked position, receive and send the system closing command sent by the off-grid system through the digital input interface or remote communication interface.

[0052] S402. According to the system closing command, control the drive gear to move from the locked position to the unlocked position, and drive the handle gear to move from the open position to the closed position through the drive gear.

[0053] When the drive gear is in the locked position, it indicates that the circuit breaker can support system closing commands sent via digital input interface or remote communication interface. In this case, if the grid connection system sends a system closing command to the controller in the circuit breaker via the digital input interface or remote communication interface, the controller can control the drive gear to move from the locked position to the unlocked position via the motor according to the system closing command. The drive gear then drives the handle gear to move from the open position to the closed position. This enables rapid unlocking and rapid closing via system closing command when the gear assembly is in the locked position, thereby improving the closing speed and applicability of the circuit breaker.

[0054] Of course, it should be noted that this application does not limit the conditions for generating the system closing command. For example, when the inverter determines that the grid connection conditions are met based on the phase difference and amplitude difference between the incoming and outgoing lines of the circuit breaker, it can generate a system closing command, and the circuit breaker can perform a fast closing operation based on the system closing command.

[0055] In an optional implementation, after controlling the drive gear to move from the locked position to the unlocked position according to the system closing command, and driving the handle gear to move from the open position to the closed position via the drive gear, the method further includes: The handle gear is driven by the main handle to move from the closed position to the open position.

[0056] When the drive gear is in the unlocked position, it indicates that manual closing is allowed. Optionally, the main handle can be moved to the closing position, and the main handle drives the handle gear from the open position to the closing position. This realizes that the circuit breaker of this application can support system opening, system closing and manual closing, which can improve the applicability of the circuit breaker.

[0057] Figure 5 This is a flowchart illustrating another circuit breaker-based control method provided in an embodiment of this application. In optional implementations, such as... Figure 5As shown, after controlling the drive gear to move from the locked position to the unlocked position according to the unlock command, the process also includes: S501, Obtain the locking command generated by the locking button in the circuit breaker.

[0058] S502. According to the locking command, control the drive gear to move from the unlocked position to the locked position.

[0059] The locking button can be a physical button located on the circuit breaker body. When the user presses the locking button, a locking command will be generated and sent to the controller. After receiving the locking command, the controller can control the drive gear to move from the unlocked position to the locked position, so that the drive gear can flexibly switch between the unlocked position and the locked position, which can meet the state requirements in different scenarios.

[0060] Based on the above explanation, it can be understood that when the drive gear is in the locked position, the circuit breaker will support the system closing command sent by the parallel and off-grid systems through the digital input interface or remote communication interface, and will prohibit manual closing, which can improve the applicability of the parallel and off-grid systems.

[0061] It should be noted that after the drive gear moves from the unlocked position to the locked position, if manual closing is required, the above method can be used to first generate an unlock command through the unlock button, and then control the drive gear to move from the locked position to the unlocked position according to the unlock command; when the drive gear is in the unlocked position, the handle gear can then be driven from the open position to the closed position by the main handle.

[0062] It should also be noted that in some methods, the unlock button and the lock button can be the same physical button. If the drive gear is currently in the unlock position, pressing the physical button will generate a lock command, and conversely, if the drive gear is currently in the lock position, pressing the physical button will generate an unlock command.

[0063] The embodiments of this application can realize flexible switching of the drive gear between the unlocked position and the locked position, which can meet the working needs in different scenarios.

[0064] In an optional embodiment, a first detection unit is provided at the closed position and the open position of the handle gear, and a second detection unit is provided at the locked position and the unlocked position of the drive gear. The first detection unit and the second detection unit are electrically connected to the controller. The first detection unit and the second detection unit include at least one of the following: a micro switch and a Hall element.

[0065] Optionally, the detection units set at the closed, open, locked, and unlocked positions can be the same or different, and are not limited here. For example, the closed and open positions of the handle gear can be respectively equipped with microswitches, and the locked and unlocked positions of the drive gear can be respectively equipped with Hall elements. Of course, the specific setting method is not limited to this.

[0066] Understandably, with detection units installed at the closed, open, locked, and unlocked positions, the controller can determine the position of the gear assembly based on the detection signals from each detection unit.

[0067] For example, taking a microswitch installed at the closed position as an example, if the controller determines that the signal collected by the microswitch is 1, it can be considered that the current position of the handle gear is the closed position. If the collected signal is 0, it can be considered that the current position of the handle gear is another position.

[0068] Figure 6 This is a flowchart illustrating another circuit breaker-based control method provided in an embodiment of this application. In optional implementations, such as... Figure 6 As shown, the above method also includes: S601. Collect the first voltage signal and the second voltage signal on the incoming and outgoing sides of the circuit breaker, respectively.

[0069] S602. Calculate the target voltage difference between the second voltage signal and the first voltage signal.

[0070] S603. Determine the wear degree of the contact group in the circuit breaker based on the target voltage difference.

[0071] In some implementations, corresponding metering chips can be installed on the incoming and outgoing sides of the circuit breaker, respectively. The metering chips collect the first voltage signal on the incoming side and the second voltage signal on the outgoing side, respectively. The target voltage difference between the two is calculated based on the second voltage signal and the first voltage signal. The wear degree of the contact group in the circuit breaker is determined based on the target voltage difference and a preset wear mapping table.

[0072] Optionally, the preset wear mapping table may include a mapping relationship between voltage difference and contact group wear degree, wherein the contact group wear degree may include: first-level wear, second-level wear and third-level wear, wherein the wear severity corresponding to first-level wear is greater than the wear severity corresponding to second-level wear, the wear severity corresponding to second-level wear is greater than the wear severity corresponding to third-level wear, and the voltage difference corresponding to each level of wear can be obtained through historical experimental statistics.

[0073] In some implementations, if the wear level of the contact group is determined to be Level 1 wear based on the target voltage difference and a preset wear mapping table, it can be confirmed that the wear of the contact group is relatively serious. In this case, the contact group can be replaced to ensure the normal operation of the grid system.

[0074] In an optional implementation, after calculating the target voltage difference between the second voltage signal and the first voltage signal, the method further includes: The detection signal collected by the detection unit at the tripped position is acquired; based on the detection signal and the target voltage difference, it is determined whether the circuit breaker has successfully tripped.

[0075] In some implementations, when a detection unit is provided at the open position of the gear assembly, the detection signal collected by the detection unit at that open position can also be acquired. If the detection signal indicates that the handle gear is in the open position and the target voltage difference is greater than a preset voltage value, it can be considered that the circuit breaker has failed to open, and the contact group may have contact adhesion. The preset voltage value can be any value such as 1V or 2V, and is not limited here. It can be flexibly set according to the actual application scenario.

[0076] By applying the embodiments of this application, it is possible to accurately identify whether the circuit breaker has successfully tripped based on the detection signal and the target voltage difference, avoiding misjudgment due to contact sticking in the contact group, and improving the intelligence of the grid connection and disconnection system.

[0077] Of course, it should be noted that in some implementations, the circuit breaker may be set to determine whether it has been successfully tripped based on one or more of the detection signals collected by the detection unit at the tripped position, the target voltage difference mentioned above, and the main circuit current of the circuit breaker. This can be flexibly set according to the actual application scenario and is not limited here.

[0078] In an optional implementation, the circuit breaker further includes: a digital output interface, and a contact status detection unit is provided at the contact position in the circuit breaker; a controller that detects the opening and closing status of the circuit breaker through the contact status detection unit and sends the opening and closing status of the circuit breaker to the grid-connected and off-grid system through the digital output interface.

[0079] In some implementations, the contact status detection unit located at the contact position in the circuit breaker can be a micro switch, Hall element, etc., which is not limited here. The contact status detection unit can be used to detect the contact status of the contact group.

[0080] Optionally, the circuit breaker can also be equipped with a digital output interface. The controller can connect to the digital input interface of the inverter in the grid-connected and off-grid system through this digital output interface. In some implementations, after the controller identifies the opening and closing status of the circuit breaker through the contact status detection unit, it can send the opening and closing status of the circuit breaker to the inverter through the digital output interface. It can be understood that at this time, the information sent by the controller to the grid-connected and off-grid maintenance personnel can clearly know the current opening and closing status of the circuit breaker, which can improve the intelligence and applicability of the grid-connected and off-grid system.

[0081] Optionally, the present invention also provides a circuit breaker, comprising: a controller, a motor, an unlocking button, a trip unit, a main handle, a handle gear, and a drive gear; wherein the motor, the unlocking button, and the trip unit are electrically connected to the controller, the trip unit is drive-connected to the main handle, the main handle is drive-connected to the handle gear, and the drive gear is drive-connected to the motor; the controller is used in the circuit breaker-based control method of any of the foregoing embodiments. The basic principle and technical effects of this circuit breaker are the same as those in the corresponding method embodiments described above. For the sake of brevity, parts not mentioned in this embodiment can be referred to the corresponding content in the method embodiments.

[0082] Based on the above-mentioned circuit breaker-based control method, when a circuit breaker is installed in a parallel-to-isolated system, the circuit breaker can control the handle gear to move from the closed position to the open position according to the system's opening command, and then control the drive gear to move from the unlocked position to the locked position. This prevents manual closing operations and avoids the serious threat to personnel safety and equipment stability caused by local accidental closing of the power grid.

[0083] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0084] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0085] It should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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. Unless otherwise specified, 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. It should be noted that similar reference numerals and letters denote similar items in the accompanying drawings; therefore, once an item is defined in one drawing, it will not be further defined or explained in subsequent drawings.

[0086] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method based on a circuit breaker, characterized in that, A controller applied in a circuit breaker, the control method comprising: Receive and disconnect system tripping commands sent by the off-grid system; According to the system tripping command, after controlling the handle gear in the circuit breaker to move from the closed position to the tripping position, the drive gear in the circuit breaker is controlled to move from the unlocked position to the locked position. When the drive gear is in the locked position, the circuit breaker uses a mechanical limit to prevent the main handle from driving the handle gear to move towards the closed position to prohibit manual closing. When the drive gear is in the locked position, the unlock command generated by the unlock button in the circuit breaker is obtained; The drive gear is controlled to move from the locked position to the unlocked position according to the unlocking command. When the drive gear is in the unlocked position, the circuit breaker supports switching from the open state to the closed state via the main handle.

2. The control method according to claim 1, characterized in that, After controlling the drive gear to move from the locked position to the unlocked position according to the unlocking command, the method further includes: When the drive gear is in the unlocked position, the handle gear is driven by the main body handle to move from the open position to the closed position.

3. The control method according to claim 1, characterized in that, After controlling the drive gear in the circuit breaker to move from the unlocked position to the locked position, the method further includes: When the drive gear is in the locked position, the system closes the circuit breaker command sent by the grid-connected system through a digital input interface or a remote communication interface. According to the system closing command, the drive gear is controlled to move from the locked position to the unlocked position, and the handle gear is driven by the drive gear to move from the open position to the closed position.

4. The control method according to claim 3, characterized in that, After controlling the drive gear to move from the locked position to the unlocked position according to the system closing command, and driving the handle gear to move from the open position to the closed position via the drive gear, the process further includes: The handle gear is driven by the main handle to move from the closed position to the open position.

5. The control method according to claim 1, characterized in that, After controlling the drive gear to move from the locked position to the unlocked position according to the unlocking command, the method further includes: Obtain the locking command generated by the locking button in the circuit breaker; According to the locking command, the drive gear is controlled to move from the unlocked position to the locked position.

6. The control method according to claim 1, characterized in that, The handle gear is provided with a first detection unit at the closed position and the open position, and the drive gear is provided with a second detection unit at the locked position and the unlocked position. The first detection unit and the second detection unit are electrically connected to the controller. The first detection unit and the second detection unit include at least one of the following: a micro switch and a Hall element. The controller is used to determine the position of the handle gear based on the detection signals of each of the first detection units, and to determine the position of the drive gear based on the detection signals of each of the second detection units.

7. The control method according to claim 1, characterized in that, The method further includes: The first voltage signal and the second voltage signal on the incoming side and the outgoing side of the circuit breaker are collected respectively; Calculate the target voltage difference between the second voltage signal and the first voltage signal; The wear degree of the contact group in the circuit breaker is determined based on the target voltage difference.

8. The control method according to claim 7, characterized in that, After calculating the target voltage difference between the second voltage signal and the first voltage signal, the method further includes: Acquire the detection signal collected by the detection unit at the opening position; Based on the detection signal and the target voltage difference, it is determined whether the circuit breaker has successfully tripped.

9. The control method according to any one of claims 1-8, characterized in that, The circuit breaker further includes a digital output interface, and a contact status detection unit is provided at the contact position in the circuit breaker; The controller detects the opening and closing status of the circuit breaker through the contact status detection unit, and sends the opening and closing status of the circuit breaker to the grid-connected system through the digital output interface.

10. A circuit breaker, characterized in that, The circuit breaker includes: a controller, a motor, an unlocking button, a trip unit, a main handle, a handle gear, and a drive gear; The motor, the unlock button, and the trip unit are electrically connected to the controller. The trip unit is driven by the main handle. The main handle is driven by the handle gear. The drive gear is driven by the motor. The controller is used to execute the circuit breaker-based control method according to any one of claims 1-9.

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