Opening and closing control method and device based on circuit breaker and control protection system

Abstract

The invention discloses an opening and closing control method and device based on a circuit breaker and a control protection system, and relates to the technical field of power transmission. The method comprises the following steps: executing a corresponding first control instruction based on different working states of a switch to determine and detect an opening and closing mechanism of the switch, determining a response mechanism and a second working state based on the opening and closing mechanism, and if the two working states are the same, determining that the switch fails to work so as to avoid the situation that the normal work of the system is influenced by continuously issuing a control instruction to the failed switch. If the two working states are different and the second working state is the intermediate state, the corresponding switch is determined as a fault switch, so that delayed working or non-working of the connecting device caused by failure in timely detection of the problem of the switch is avoided, and the corresponding fault switch is stopped in time; therefore, other normal switches are ensured to issue corresponding control instructions for normal work processing, and the reliability of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and in particular to a circuit breaker-based opening and closing control method, device and control protection system. Background Art

[0002] If a switch of a conventional DC circuit breaker fails, the controller of the high-voltage DC circuit breaker fails to detect it in time and still applies instructions to the faulty switch, causing subsequent connection components to delay operation or not work, thereby affecting the working process of the entire system and reducing the reliability of the system.

[0003] Therefore, how to detect the faulty switch in time to improve the reliability of the system is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The object of the present invention is to provide a method, device and control protection system for opening and closing of a circuit breaker, so as to solve the problem that if a switch fails, the controller to which the high-voltage DC circuit breaker belongs fails to detect it in time and still applies instructions to the faulty switch, resulting in the subsequent connection devices being delayed in working or not working, and the system reliability is reduced.

[0005] In order to solve the above technical problems, the present invention provides a circuit breaker opening and closing control method, comprising:

[0006] Acquire a first working state corresponding to a switch controlling the opening and closing of a circuit breaker within a preset time interval;

[0007] issuing a corresponding first control instruction to the switch according to the corresponding first working state to detect the opening and closing mechanism of the switch;

[0008] Determining a response mechanism and a second working state of the switch according to the opening and closing mechanism;

[0009] Based on the response mechanism of the switch, if the first working state is the same as the second working state, determining that the switch corresponding to the first working state being the same as the second working state is faulty;

[0010] Based on the response mechanism of the switch, if the first working state is different from the second working state, it is determined that the corresponding switch fails when the first working state is different from the second working state and the second working state is an intermediate state.

[0011] On the one hand, issuing a corresponding first control instruction to the switch according to the corresponding first working state includes:

[0012] When the first working state is the open state, obtaining a closing control instruction issued by a control and protection system to which the circuit breaker belongs, and issuing the closing control instruction to the switch;

[0013] When the first working state is the closed state, an opening control instruction issued by a control and protection system to which the circuit breaker belongs is obtained, and the opening control instruction is issued to the switch.

[0014] On the other hand, determining the response mechanism and the second working state of the switch according to the opening and closing mechanism includes:

[0015] When the closing control instruction is issued to the switch, the control energy storage unit conducts the closing circuit; controls the closing of the switch; and receives the position information of the switch sent by the control energy storage unit; determines the state of the switch in response to the closing control instruction and the corresponding second working state according to the position information of the switch;

[0016] When the opening control instruction is issued to the switch, the opening circuit is turned on by the control energy storage unit; the switch is controlled to open; and the position information of the switch sent by the control energy storage unit is received; and the state of the switch in response to the opening control instruction and the corresponding second working state are determined according to the position information of the switch.

[0017] On the other hand, based on the response mechanism of the switch, if the first working state is the same as the second working state, determining that the switch corresponding to the first working state being the same as the second working state is faulty includes:

[0018] When the first working state is the open state, the second working state is the open state, and the switch corresponding to the first working state and the second working state does not respond to the closing control instruction, it is determined that the switch corresponding to the first working state and the second working state is faulty; correspondingly, it also includes: issuing an opening control instruction to the remaining normal switches other than the switch corresponding to the first working state and the second working state; prohibiting the sending of a prohibition of opening and closing signal to the control and protection system, and receiving a new first control instruction sent by the control and protection system; wherein the first remaining normal switches are the first working state is the open state and the second working state is the closing state;

[0019] When the first working state is the closed state, the second working state is the closed state, and the switch corresponding to the first working state being the same as the second working state does not respond to the opening control instruction, it is determined that the switch corresponding to the first working state being the same as the second working state has a fault; correspondingly, it also includes: prohibiting the sending of a prohibition of opening and closing signal to the control and protection system, and receiving a new first control instruction sent by the control and protection system.

[0020] On the other hand, based on the response mechanism of the switch, if the first working state is different from the second working state, determining that the switch corresponding to the first working state is different from the second working state and the second working state is an intermediate state is faulty, includes:

[0021] When the first working state is an open state and the second working state is an intermediate state, it is determined that the switch corresponding to the first working state being different from the second working state and the second working state being the intermediate state is faulty; correspondingly, it also includes: issuing the open control instruction to the remaining normal switches other than the switch corresponding to the first working state being different from the second working state and the second working state being the intermediate state, and sending an open and close prohibition signal to the control and protection system; wherein the remaining normal switches are the switches whose first working state is an open state and whose second working state is a closed state;

[0022] When the first working state is a closed state and the second working state is an intermediate state, it is determined that the first working state is different from the second working state and the switch corresponding to the intermediate state of the second working state fails; correspondingly, it also includes: sending a closing prohibition signal to the control and protection system.

[0023] On the other hand, after acquiring the first working state corresponding to the switch controlling the circuit breaker within the preset time interval, and before issuing the corresponding first control instruction to the switch according to the corresponding first working state, the method further includes:

[0024] When the switch is in the open state and the number of faults in the switch exceeds a preset number, a closing prohibition signal is sent to the control and protection system; if the number of faults in the switch does not exceed the preset number, the switch is entered into the first working state according to the open state and a corresponding first control instruction is issued to the switch;

[0025] When the switch is in a closed state and the number of faults existing in the switch exceeds a preset number, a signal prohibiting opening is sent to the control and protection system; if the number of faults existing in the switch does not exceed the preset number, the system enters the first working state according to the closed state and issues a corresponding first control instruction to the switch.

[0026] On the other hand, the process of determining the opening control instruction includes:

[0027] When the capacitor voltage corresponding to the main opening signal is the same as the threshold capacitor voltage, the opening control instruction is determined according to the main opening signal;

[0028] When the capacitor voltage corresponding to the main opening signal is different from the threshold capacitor voltage, the backup opening signal is replaced, and the capacitor voltage corresponding to the backup opening signal is obtained;

[0029] When the capacitor voltage corresponding to the backup and opening gate signal is the same as the threshold capacitor voltage, the opening gate control instruction is determined according to the backup and opening gate signal.

[0030] In order to solve the above technical problems, the present invention also provides a circuit breaker-based opening and closing control device, comprising a controller, a control energy storage unit and a switch; wherein the control energy storage unit and the switch are located on the circuit breaker;

[0031] The controller, the control energy storage unit and the switch are connected in sequence;

[0032] The controller is used to execute the steps of the above-mentioned circuit breaker-based opening and closing control method to realize the opening and closing processing of the switch.

[0033] On the one hand, there are multiple controllers, each controller is connected to each control energy storage unit, and each control energy storage unit is connected to the switch in a one-to-one correspondence.

[0034] In order to solve the above technical problems, the present invention also provides a control and protection system, including an opening and closing control device based on a circuit breaker.

[0035] The present invention provides a circuit breaker-based opening and closing control method, including obtaining a first working state corresponding to a switch controlling the opening and closing of the circuit breaker within a preset time interval; issuing a corresponding first control instruction to the switch according to the corresponding first working state to detect the opening and closing mechanism of the switch; determining the response mechanism and the second working state of the switch according to the opening and closing mechanism; based on the response mechanism of the switch, if the first working state is the same as the second working state, determining the switch fault corresponding to the first working state being the same as the second working state; based on the response mechanism of the switch, if the first working state and the second working state are different, determining that the corresponding switch fault occurs when the first working state is different from the second working state and the second working state is an intermediate state. The present invention monitors the working state of the circuit breaker switch in real time, where the working state is the opening and closing state, executes the corresponding first control instruction based on different working states to determine the opening and closing mechanism of the detection switch, determines the response mechanism and the second working state based on the opening and closing mechanism, compares the two working states, and if the two working states are the same, determines the switch fault, so as to avoid continuing to issue control instructions to the faulty switch and affecting the normal operation of the system. If the two working states are different and the switch corresponding to the second working state is an intermediate state, it is determined to be a faulty switch, so as to avoid delayed operation or non-operation of the connecting device due to failure to detect problems with the switch in time. The present invention promptly stops the faulty switch to ensure that the remaining normal switches send corresponding control instructions to perform normal working processing, thereby improving the reliability of the system.

[0036] In addition, the present invention also provides a circuit breaker-based opening and closing control device and a control protection system, which have the same beneficial effects as the above-mentioned circuit breaker-based opening and closing control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] FIG1 is a flow chart of a circuit breaker opening and closing control method provided by an embodiment of the present invention;

[0039] FIG2 is a schematic structural diagram of a circuit breaker-based opening and closing control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The core of the present invention is to provide a circuit breaker-based opening and closing control method, device and control protection system to solve the problem that if there is a switch fault, the controller of the high-voltage DC circuit breaker fails to detect it in time and still applies instructions to the faulty switch, resulting in subsequent connection devices being delayed in working or not working, which reduces the system reliability.

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] It should be noted that if a conventional DC circuit breaker has a switch failure, the controller will normally issue a control instruction. At this time, the system will mistakenly believe that the current switch is normal, resulting in the failure information being reported only when the subsequent controlled device of the switch does not work, and subsequent troubleshooting is performed, which increases the troubleshooting time. At the same time, the faulty switch cannot be detected in time, resulting in reduced safety and reliability of the entire system. The circuit breaker opening and closing control method provided by the present invention can solve the above technical problems.

[0044] FIG1 is a flow chart of a circuit breaker opening and closing control method provided by an embodiment of the present invention. As shown in FIG1 , the method includes:

[0045] S11: obtaining a first working state corresponding to a switch controlling the opening and closing of a circuit breaker within a preset time interval;

[0046] S12: issuing a corresponding first control instruction to the switch according to the corresponding first working state to detect the opening and closing mechanism of the switch;

[0047] S13: Determine the response mechanism and the second working state of the switch according to the opening and closing mechanism;

[0048] S14: Determine whether the first working state and the second working state are the same, if they are the same, proceed to step S15, if they are different, proceed to step S16;

[0049] S15: Based on the response mechanism of the switch, if the first working state is the same as the second working state, determining that the switch corresponding to the first working state being the same as the second working state is faulty;

[0050] S16: Based on the response mechanism of the switch, if the first working state and the second working state are different, it is determined that the corresponding switch fails when the first working state is different from the second working state and the second working state is an intermediate state.

[0051] Specifically, the circuit breaker of the present invention may be a high-voltage DC circuit breaker, wherein the high-voltage DC circuit breaker includes a hybrid DC circuit breaker, a mechanical DC circuit breaker, a coupled negative pressure DC circuit breaker, etc., or other circuit breakers, etc., and the type of the circuit breaker is not limited here, and can be set according to actual conditions. In step S11, the first working state corresponding to the switch that controls the opening and closing of the circuit breaker is obtained within a preset time interval. It should be noted that the circuit breaker is mainly composed of a switch and a power electronic device. For example, it is composed of a fast mechanical switch and a power electronic device, and its core feature is that it relies on a fast mechanical switch to carry current, and the current is opened and closed by the power electronic device, and a fast current cutting capability is provided when necessary, while maintaining a low on-state voltage drop. The type of switch is not limited, and it can be a fast mechanical switch or other switches. The fast mechanical switch is a core component in a DC circuit breaker, which is responsible for carrying steady-state and transient currents, realizing fast opening and closing, and withstanding the opening recovery voltage. Fast mechanical switches are used in flexible DC power grids. They can quickly interrupt DC short-circuit currents and selectively isolate faulty components. They are an effective technical means to overcome the difficulties in handling faults on the DC side of flexible DC power grids.

[0052] The first working state is the open state and closed state of the switch when the switch is working normally. The number of switches in step S11 is not limited, and there are multiple switches. The corresponding switch state can be an open state or a closed state. The present invention performs opening and closing control for different working states. In step S12, the corresponding first control instruction is issued to the switch according to different first working states to detect the opening and closing mechanism of the switch. The first control instruction corresponding to the open state or the closed state is different. If it is in the open state, the corresponding first control instruction is a closing control instruction, and the closing mechanism of the switch is detected; if it is in the closed state, the corresponding first control instruction is an open control instruction, and the opening mechanism of the switch is detected.

[0053] In some embodiments, issuing a corresponding first control instruction to the switch according to the corresponding first working state includes:

[0054] When the first working state is the opening state, obtaining a closing control instruction issued by a control and protection system to which the circuit breaker belongs, and issuing the closing control instruction to the switch;

[0055] When the first working state is the closing state, an opening control instruction issued by a control and protection system to which the circuit breaker belongs is obtained, and the opening control instruction is issued to the switch.

[0056] Specifically, when the first working state is the opening state, it is necessary to obtain the closing control instruction issued by the control protection system in the circuit breaker to issue the closing control instruction to the switch. The issuing process here can be directly issued to the switch body, or the instruction can be issued to the control energy storage unit, and the control energy storage unit detects the position of the switch and feeds it back to the controller and responds to the instruction. The control energy storage unit here has a one-to-one correspondence with the switch, and its function is to monitor the position of the switch, the health status of the switch (whether the switch can be opened and closed normally), the energy (capacitance) provided by the opening and closing of the switch, and communicate with the controller.

[0057] Similarly, when the first working state is the closing state, the opening control instruction issued by the control and protection system is obtained, and the opening control instruction is issued to the switch to facilitate the detection of the opening mechanism of the switch.

[0058] The first control instruction determined based on different first working states provided in this embodiment is for the purpose of detecting the opening and closing mechanism of the switch, laying a foundation for the opening and closing control mechanism, and facilitating the issuance and implementation of subsequent instructions.

[0059] In step S13, the response mechanism and the second working state of the switch are determined according to the opening and closing mechanism. It should be noted here that the response mechanism of the switch is to check whether the switch responds to the opening and closing mechanism under the first control instruction. For example, if the first control instruction is an opening control instruction, the opening and closing mechanism is an opening mechanism. The corresponding switch response mechanism is to determine whether the switch actually responds to the opening control instruction to improve the judgment accuracy of the switch and judge whether the switch is faulty through the feedback mechanism. The second working state corresponds to whether the switch changes in the working state through the issuance of the control instructions of step S12 and step S13. If it changes, the detection state of the switch is determined based on the comparison between the first working state and the second working state.

[0060] In some embodiments, determining the response mechanism and the second working state of the switch according to the opening and closing mechanism includes:

[0061] When a closing control command is issued to the switch, the energy storage unit is controlled to conduct the closing circuit; the switch is controlled to close; and the position information of the switch sent by the energy storage unit is received; and the state of the switch in response to the closing control command and the corresponding second working state are determined according to the position information of the switch;

[0062] When a switch opening control instruction is sent to the switch, the control energy storage unit turns on the switch opening circuit; controls the switch to open; and receives the position information of the switch sent by the control energy storage unit; determines the state of the switch in response to the switch opening control instruction and the corresponding second working state according to the switch position information.

[0063] Specifically, a closing control instruction is sent to the switch, and the closing circuit is turned on by controlling the energy storage unit to close the switch. At this time, the controller receives the position information of the switch sent by the control energy storage unit, and determines whether the switch responds to the state of the closing control instruction and the actual second working state according to the position information of the switch. The second working state here can be an open state, a closed state, or an intermediate state, etc., which is not limited here, but only corresponds to the current actual state of the switch. Among them, the intermediate state is a half-open and half-closed state, and the corresponding state detection can be measured by a sensor. Under normal circumstances, the intermediate state is a transient state, that is, the switch is neither open nor closed, and it is a gap that cannot be recognized by the optical sensor.

[0064] Similarly, a trip control instruction is sent to the switch, and the control energy storage unit turns on the trip circuit to trip the switch. At this time, the controller receives the position information of the switch sent by the control energy storage unit, and determines whether the switch responds to the trip control instruction and the actual second working state based on the switch position information.

[0065] This embodiment provides a method for determining a response mechanism and a second working state of a switch according to a corresponding opening and closing mechanism. Through the process of determining the response mechanism and the second working state, the accuracy of the opening and closing mechanism of the switch is improved, thereby laying a foundation for subsequent fault judgment.

[0066] The judgment of whether the first working state and the second working state are the same in step S14 corresponds to step S15 and step S16. The judgment conclusions based on the response mechanism of the switch and the two working states are two different control actions and are not used as sequential control. However, the fault state and the half-open and half-closed state of the switch are determined when the two working states are compared, and the response mechanism of the switch is also limited. That is, the two limiting conditions are indispensable. The subsequent state of the switch is determined based on the response mechanism of the switch and the comparison result of the two working states.

[0067] In some embodiments, the switch-based response mechanism in step S15, if the first working state is the same as the second working state, determines that a switch corresponding to the first working state being the same as the second working state is faulty, includes:

[0068] When the first working state is the open state, the second working state is the open state, and the switch corresponding to the first working state and the second working state does not respond to the closing control instruction, it is determined that the switch corresponding to the first working state and the second working state is faulty; correspondingly, it also includes: issuing an opening control instruction to the remaining normal switches other than the switches corresponding to the first working state and the second working state; prohibiting the sending of a prohibition of opening and closing signal to the control and protection system, and receiving a new first control instruction sent by the control and protection system; wherein the remaining normal switches are the first working state of the open state and the second working state of the closing state;

[0069] When the first working state is the closed state, the second working state is the closed state and the switch corresponding to the first working state and the second working state does not respond to the opening control instruction, it is determined that the switch corresponding to the first working state and the second working state is faulty; correspondingly, it also includes: prohibiting the sending of a prohibition of opening and closing signal to the control and protection system, and receiving a new first control instruction sent by the control and protection system.

[0070] Specifically, the first working state is the open state, and the second working state is also the open state, but the switch at this time does not respond to the closing control instruction, which means that the switch is faulty, and it is necessary to send the opening control instruction to the remaining normal switches other than the switch to maintain the consistency of the working state of the remaining normal switches and the current faulty switch, so as to control and process the remaining normal switches. It should be noted that the normal working state of the remaining normal switches here is that the first working state is the open state, and the second working state is the closed state. At the same time, the controller is prohibited from sending the forbidden opening and closing signal to the control and protection system, indicating that the current opening and closing control switch does not have the opening and closing capability, but can receive the new first control instruction sent by the control and protection system. The forbidden opening and closing signal here corresponds to not accepting the current closing and opening instructions issued by the control and protection system, indicating that the faulty switch no longer has the ability to open or close, and needs to be repaired. The faulty switch can be marked by marking to facilitate the subsequent repair of the faulty switch.

[0071] When the first working state is the closed state, the second working state is the closed state, and the corresponding switch does not respond to the opening control instruction, the switch is determined to be faulty, and the controller is prohibited from sending the prohibition of opening and closing signals to the control and protection system, and can receive a new first control instruction sent by the control and protection system.

[0072] This embodiment provides a control processing method for the faulty switch corresponding to the opening working state and the closing working state and the corresponding signal sending when the two working states are the same, so as to timely determine the faulty switch and promptly prohibit the sending of the prohibition of opening and closing signals for subsequent maintenance work.

[0073] In some embodiments, the switch-based response mechanism in step S16, if the first working state and the second working state are different, determines that the corresponding switch fails when the first working state and the second working state are different and the second working state is an intermediate state, includes:

[0074] When the first working state is an open state and the second working state is an intermediate state, it is determined that a switch corresponding to the intermediate state where the first working state is different from the second working state is determined to be faulty; correspondingly, it also includes: issuing an open control instruction to the remaining normal switches other than the switch where the first working state is different from the second working state and the intermediate state is the second working state, and sending an open and close prohibition signal to the control and protection system; wherein the remaining normal switches are in an open state in the first working state and in a closed state in the second working state;

[0075] When the first working state is a closed state and the second working state is an intermediate state, it is determined that the switch corresponding to the first working state being different from the second working state and the second working state being an intermediate state has a fault; correspondingly, it also includes: sending a closing prohibition signal to a control and protection system.

[0076] Specifically, when the two working states are different, the first working state is an open state and the second working state is an intermediate state, the switch corresponding to the first working state being different from the second working state and the second working state being the intermediate state is faulty. A forbidden opening and closing signal is sent to the control and protection system to promptly feedback the current fault condition to the control and protection system, and the switch does not have the opening and closing capability. However, a new first control instruction can be received at this time. Similarly, when the first working state is a closed state and the second working state is an intermediate state, it is determined that the switch corresponding to the first working state being different from the second working state and the second working state being the intermediate state is faulty. A forbidden closing signal is sent to the control and protection system to wait for processing.

[0077] This embodiment provides a method for timely determining a faulty switch when the two working states are different and the second working state is an intermediate state.

[0078] A method for controlling the opening and closing of a circuit breaker provided by an embodiment of the present invention comprises obtaining a first working state corresponding to a switch controlling the opening and closing of the circuit breaker within a preset time interval; issuing a corresponding first control instruction to the switch according to the corresponding first working state to detect the opening and closing mechanism of the switch; determining the response mechanism and the second working state of the switch according to the opening and closing mechanism; based on the response mechanism of the switch, if the first working state is the same as the second working state, determining the switch fault corresponding to the first working state being the same as the second working state; based on the response mechanism of the switch, if the first working state and the second working state are different, determining that the corresponding switch fault occurs when the first working state is different from the second working state and the second working state is an intermediate state. The present invention monitors the working state of the circuit breaker switch in real time, where the working state is the opening and closing state, executes the corresponding first control instruction based on different working states to determine the opening and closing mechanism of the detection switch, determines the response mechanism and the second working state based on the opening and closing mechanism, compares the two working states, and if the two working states are the same, determines the switch fault, so as to avoid continuing to issue control instructions to the faulty switch and affecting the normal operation of the system. If the two working states are different and the switch corresponding to the second working state is an intermediate state, it is determined to be a faulty switch, so as to avoid delayed operation or non-operation of the connecting device due to failure to detect problems with the switch in time. The present invention promptly stops the faulty switch to ensure that the remaining normal switches send corresponding control instructions to perform normal working processing, thereby improving the reliability of the system.

[0079] In some embodiments, after acquiring the first working state corresponding to the switch controlling the circuit breaker within a preset time interval, and before issuing the corresponding first control instruction to the switch according to the corresponding first working state, the method further includes:

[0080] When the switch is in the open state and the number of faults in the switch exceeds a preset number, a prohibition closing signal is sent to the control and protection system; if the number of faults in the switch does not exceed the preset number, the switch enters the first working state according to the open state and a corresponding first control instruction is issued to the switch;

[0081] When the switch is in the closed state and the number of faults existing in the switch exceeds a preset number, a signal prohibiting opening is sent to the control and protection system; if the number of faults existing in the switch does not exceed the preset number, the switch enters the first working state according to the closed state and a corresponding first control instruction is issued to the switch.

[0082] Specifically, if the switch failure exceeds the preset number, the actual number of corresponding switch failures exceeds the number of switch failures that the controller can allow when closing or opening the switch. Therefore, when actually closing or opening the switch, it is necessary to determine whether the switch meets the fault redundancy. If it exceeds, it means that the corresponding closing or opening requirements are not met.

[0083] This embodiment provides that before actually opening or closing the switch, it is preliminarily determined whether the number of switch faults is compared with the preset number of allowed faults. If it exceeds, it means that the preset requirement of super redundancy is not met, and the subsequent steps cannot be performed. If it does not exceed, the determination can be continued. The preliminary determination of the faulty switch at this time improves the reliability of the system.

[0084] In some embodiments, the process of determining the opening control instruction includes:

[0085] When the capacitor voltage corresponding to the main opening signal is the same as the threshold capacitor voltage, the opening control instruction is determined according to the main opening signal;

[0086] When the capacitor voltage corresponding to the main trip signal is different from the threshold capacitor voltage, the backup trip signal is replaced and the capacitor voltage corresponding to the backup trip signal is obtained;

[0087] When the capacitor voltage corresponding to the backup opening signal is the same as the threshold capacitor voltage, the opening control instruction is determined according to the backup opening signal.

[0088] It should be noted that in this embodiment, different opening capacitors are used to provide energy for the switch opening, and the main opening signal is used for control first. If the capacitor voltage corresponding to the main opening signal is different from the threshold capacitor voltage, the backup opening signal needs to be replaced for subsequent opening control instructions. This embodiment takes into account the redundancy of the opening control instruction, which works in response to the rapid disconnection of the circuit breaker. Of course, the redundant setting of the closing control instruction can also be adopted.

[0089] The redundancy of the opening control instructions provided in this embodiment provides a guarantee for the rapid disconnection of the circuit breaker.

[0090] Furthermore, the present invention also provides a circuit breaker-based opening and closing control device. FIG2 is a schematic structural diagram of a circuit breaker-based opening and closing control device provided by an embodiment of the present invention. As shown in FIG2 , the circuit breaker includes a controller, a control energy storage unit, and a switch; wherein the control energy storage unit and the switch are located on the circuit breaker;

[0091] The controller, the control energy storage unit and the switch are connected in sequence;

[0092] The controller is used to execute the steps of the above-mentioned circuit breaker-based opening and closing control method to realize the opening and closing processing of the switch.

[0093] Specifically, the controller corresponds to the working state of the circuit breaker, and after internal logic judgment, it is sent to the control energy storage unit to complete the opening and closing of the switch. The control energy storage unit sends the working state of the switch, the capacitor voltage signal corresponding to the opening and closing, monitors the position information of the switch, maintains the stability of the opening and closing capacitor voltage, and sends a fault signal to the controller when the switch state is abnormal.

[0094] In some embodiments, there are multiple controllers, each controller is connected to each control energy storage unit, and each control energy storage unit is connected to the switch in a one-to-one correspondence.

[0095] Specifically, in this embodiment, the controller is in a primary-backup redundant relationship. If the control logic of the primary controller fails, it is directly switched to the backup controller. Therefore, each controller is connected to each control energy storage unit, and each control energy storage unit is connected to the switch in a one-to-one corresponding relationship.

[0096] The redundant connection relationship of the controller provided in this embodiment improves the reliability and stability of the system.

[0097] For an introduction to a circuit breaker-based opening and closing control device provided by the present invention, please refer to the above method embodiment, and the present invention will not be repeated here. It has the same beneficial effects as the above circuit breaker-based opening and closing control method.

[0098] Furthermore, the present invention also provides a control and protection system, comprising the above-mentioned circuit breaker-based opening and closing control device.

[0099] For an introduction to a control and protection system provided by the present invention, please refer to the above method embodiment, and the present invention will not be repeated here. It has the same beneficial effects as the above-mentioned circuit breaker-based opening and closing control device.

[0100] Taking the switch as a fast mechanical switch as an example, the corresponding devices of the control and protection system are the control host, several fast mechanical switch controls and energy storage units, and several fast mechanical switches. The control host is used to receive the opening and closing instructions issued by the flexible direct current control and protection system, and send the high-voltage DC circuit breaker status to the flexible direct current control and protection system. After internal logic judgment, it is sent to each fast mechanical switch control and energy storage unit to complete the opening and closing of the fast mechanical switch.

[0101] The fast mechanical switch control and energy storage unit sends the fast mechanical switch status, opening 0 capacitor voltage, opening 1 capacitor voltage, closing capacitor voltage signals, monitors the fast mechanical switch position, maintains the stability of the opening and closing capacitor voltages, and sends a fault signal to the control host when the fast mechanical switch status is abnormal.

[0102] 1. The closing control strategy includes the following steps:

[0103] Step 1: The control host obtains the status of the fast mechanical switch. When all the fast mechanical switches are in the open state, if the fast mechanical switch failure exceeds the redundancy, a prohibition closing signal is sent to the flexible DC control protection system. If the fast mechanical switch failure does not exceed the redundancy, the switch can be closed;

[0104] Step 2: The control host obtains the closing command issued by the flexible DC control protection system and sends it to all fast mechanical switch controls and energy storage units;

[0105] Step 3: The fast mechanical switch control and energy storage unit conducts the closing circuit to close the fast mechanical switch, and the fast mechanical switch control and energy storage unit detects the position signal of the fast mechanical switch and sends it to the control host;

[0106] Step 4: If a single fast mechanical switch does not respond to the closing command and is still in the open position, the control host sends an opening command to the normal switch, and does not send a prohibition of opening or closing signal to the flexible DC control and protection system, and can accept new control commands from the flexible DC control and protection system; if a single fast mechanical switch is in a half-open and half-closed state, the control host sends an opening command to the normal switch, and sends a prohibition of opening or closing signal to the flexible DC control and protection system.

[0107] 2. The opening control strategy includes the following steps:

[0108] Step 1: The control host obtains the status of the fast mechanical switch. When all the fast mechanical switches are in the closed state, if the fast mechanical switch failure exceeds the redundancy, a prohibition opening signal is sent to the flexible DC control protection system. If the fast mechanical switch failure does not exceed the redundancy, the switch can be opened;

[0109] Step 2: The control host obtains the tripping command issued by the flexible DC control protection system and sends it to all fast mechanical switch controls and energy storage units;

[0110] Step 3: The fast mechanical switch control and energy storage unit conducts the opening circuit to open the fast mechanical switch. The fast mechanical switch control and energy storage unit detects the position signal of the fast mechanical switch and sends it to the control host;

[0111] Step 4: If a single fast mechanical switch does not respond to the opening command and is still in the closed position, the control host does not send a fault signal to the flexible DC control protection system and can accept new control commands from the flexible DC control protection system; if a single fast mechanical switch is in a half-open and half-closed state, the control host sends a prohibition signal to the flexible DC control protection system.

[0112] By controlling the fast mechanical switch and monitoring the status of the fast mechanical switch with the energy storage unit, it is possible to promptly determine whether there is a fault during the opening and closing process, and issue specific instructions to the faulty fast mechanical switch to improve the reliability of the high-voltage DC circuit breaker.

[0113] The above is a detailed introduction to a circuit breaker-based opening and closing control method, device and control protection system provided by the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

[0114] It should also be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A circuit breaker opening and closing control method, characterized in that: include: Acquire a first working state corresponding to a switch controlling the opening and closing of a circuit breaker within a preset time interval; issuing a corresponding first control instruction to the switch according to the corresponding first working state to detect the opening and closing mechanism of the switch; Determining a response mechanism and a second working state of the switch according to the opening and closing mechanism; Based on the response mechanism of the switch, if the first working state is the same as the second working state, determining that the switch corresponding to the first working state being the same as the second working state is faulty; Based on the response mechanism of the switch, if the first working state is different from the second working state, it is determined that the corresponding switch fails when the first working state is different from the second working state and the second working state is an intermediate state.

2. The circuit breaker opening and closing control method according to claim 1, characterized in that: Sending a corresponding first control instruction to the switch according to the corresponding first working state includes: When the first working state is the open state, obtaining a closing control instruction issued by a control and protection system to which the circuit breaker belongs, and issuing the closing control instruction to the switch; When the first working state is a closed state, an opening control instruction issued by a control and protection system to which the circuit breaker belongs is obtained, and the opening control instruction is issued to the switch.

3. The circuit breaker opening and closing control method according to claim 2, characterized in that: Determining the response mechanism and the second working state of the switch according to the opening and closing mechanism includes: When the closing control instruction is issued to the switch, the control energy storage unit conducts the closing circuit; controls the closing of the switch; and receives the position information of the switch sent by the control energy storage unit; determines the state of the switch in response to the closing control instruction and the corresponding second working state according to the position information of the switch; When the opening control instruction is issued to the switch, the opening circuit is turned on by the control energy storage unit; the switch is controlled to open; and the position information of the switch sent by the control energy storage unit is received; and the state of the switch in response to the opening control instruction and the corresponding second working state are determined according to the position information of the switch.

4. The circuit breaker opening and closing control method according to claim 3, characterized in that: Based on the response mechanism of the switch, if the first working state is the same as the second working state, determining that the switch corresponding to the first working state being the same as the second working state is faulty includes: When the first working state is the open state, the second working state is the open state, and the switch corresponding to the first working state and the second working state does not respond to the closing control instruction, it is determined that the switch corresponding to the first working state and the second working state is faulty; correspondingly, it also includes: issuing an opening control instruction to the remaining normal switches other than the switch corresponding to the first working state and the second working state; prohibiting the sending of a prohibition of opening and closing signal to the control and protection system, and receiving a new first control instruction sent by the control and protection system; wherein the remaining normal switches are the first working state in the open state and the second working state in the closed state; When the first working state is the closed state, the second working state is the closed state, and the switch corresponding to the first working state being the same as the second working state does not respond to the opening control instruction, it is determined that the switch corresponding to the first working state being the same as the second working state has a fault; correspondingly, it also includes: prohibiting the sending of a prohibition of opening and closing signal to the control and protection system, and receiving a new first control instruction sent by the control and protection system.

5. The circuit breaker opening and closing control method according to claim 3, characterized in that: Based on the response mechanism of the switch, if the first working state and the second working state are different, determining that the switch corresponding to the first working state is different from the second working state and the second working state is an intermediate state has a fault, includes: When the first working state is an open state and the second working state is an intermediate state, it is determined that the switch corresponding to the first working state being different from the second working state and the second working state being the intermediate state is faulty; correspondingly, it also includes: issuing the open control instruction to the remaining normal switches other than the switch corresponding to the first working state being different from the second working state and the second working state being the intermediate state, and sending an open and close prohibition signal to the control and protection system; wherein the remaining normal switches are the switches whose first working state is an open state and whose second working state is a closed state; When the first working state is a closed state and the second working state is an intermediate state, it is determined that the first working state is different from the second working state and the switch corresponding to the intermediate state of the second working state fails; correspondingly, it also includes: sending a closing prohibition signal to the control and protection system.

6. The circuit breaker opening and closing control method according to any one of claims 1 to 5, characterized in that: After acquiring the first working state corresponding to the switch controlling the circuit breaker within the preset time interval, and before issuing the corresponding first control instruction to the switch according to the corresponding first working state, the method further includes: When the switch is in the open state and the number of faults in the switch exceeds a preset number, a closing prohibition signal is sent to the control and protection system; if the number of faults in the switch does not exceed the preset number, the switch is entered into the first working state according to the open state and a corresponding first control instruction is issued to the switch; When the switch is in a closed state and the number of faults existing in the switch exceeds a preset number, a signal prohibiting opening is sent to the control and protection system; if the number of faults existing in the switch does not exceed the preset number, the system enters the first working state according to the closed state and issues a corresponding first control instruction to the switch.

7. The circuit breaker opening and closing control method according to claim 2, characterized in that: The process of determining the opening control instruction includes: When the capacitor voltage corresponding to the main opening signal is the same as the threshold capacitor voltage, the opening control instruction is determined according to the main opening signal; When the capacitor voltage corresponding to the main opening signal is different from the threshold capacitor voltage, the backup opening signal is replaced, and the capacitor voltage corresponding to the backup opening signal is obtained; When the capacitor voltage corresponding to the backup and opening gate signal is the same as the threshold capacitor voltage, the opening gate control instruction is determined according to the backup and opening gate signal.

8. A circuit breaker-based opening and closing control device, characterized in that: It includes a controller, a control energy storage unit and a switch; wherein the control energy storage unit and the switch are located on the circuit breaker; The controller, the control energy storage unit and the switch are connected in sequence; The controller is used to execute the steps of the circuit breaker-based opening and closing control method as described in any one of claims 1 to 7 above, so as to realize the opening and closing processing of the switch.

9. The circuit breaker-based opening and closing control device according to claim 8, characterized in that: There are multiple controllers, each controller is connected to each control energy storage unit, and each control energy storage unit is connected to the switch in a one-to-one correspondence.

10. A control and protection system, characterized in that: It includes the circuit breaker-based opening and closing control device as described in claim 8 or 9.

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