Multi-path power supply incoming line operation locking method based on spare power automatic switching device

Abstract

The invention discloses a multi-path power supply incoming line operation locking method based on a spare power automatic switching device. The method comprises the steps of signal acquisition, switching-on locking condition judgment, spare power automatic switching device logic judgment, operation execution of a control unit, switching-on permission condition output and the like. By collecting digital quantity and analog quantity signals, closing and locking conditions are strictly judged, and an operation mode is determined by utilizing a logic judgment algorithm. Signal processing adopts a digital filtering algorithm to improve accuracy. And the control unit executes operation and feeds back according to the judgment result. The switching-on permission condition output node is connected in series with a switching-on loop to prevent misoperation. The method improves the operation reliability and response speed, prevents misoperation, and enhances the safety and stability of a power system.

Description

Technical Field

[0001] The invention belongs to the field of power system automation, and in particular relates to a method for locking operation of multi-channel power supply incoming lines based on a standby automatic switching device. Background Art

[0002] In the power system, the power busbar for the power supply is usually connected to multiple power sources. These power sources sometimes come from different power systems. When switching the power source, synchronous operation (first send and then stop) or asynchronous operation (first stop and then send) is required. Due to the complexity of the operation, operators are prone to make mistakes when switching the incoming power source, resulting in power system failures and safety hazards. In order to prevent these wrong operations, a reliable remote and local operation locking system is required.

[0003] In the power system, the traditional multi-power supply line operation lockout method mainly relies on directly collecting the circuit breaker position and the incoming line and bus voltage for logical judgment. Although this method can achieve operation lockout to a certain extent, it has the following shortcomings and defects: Complex signal acquisition: Traditional methods require the acquisition of a large number of analog and digital signals, including circuit breaker position, incoming line voltage, bus voltage, current signals, etc. The acquisition and transmission lines of these signals are complex, which increases the complexity and maintenance difficulty of the system. Due to the large number of types and quantities of collected signals, signal interference and errors are easily caused, affecting the accuracy of judgment.

[0004] Other shortcomings are: Complex logical judgment: Traditional methods require logical judgment of a large number of signals, and the logical relationship is complex and prone to errors. Especially when switching multiple power supplies, the accuracy and real-time performance of logical judgment are crucial, and complex logical relationships increase the risk of misoperation. Complex logical judgment increases the difficulty of system design and debugging, requiring a higher level of technology and more debugging time.

[0005] Insufficient reliability and safety: Since traditional methods need to collect and process a large number of signals, the reliability and safety of the system are affected. Any failure or misjudgment of a signal may lead to misoperation, causing failure and safety hazards in the power system. Traditional methods lack effective means for locking remote and local operations, and operators are prone to misoperation when switching power sources, increasing the risk of system operation.

[0006] Difficulty in maintenance and upgrade: Since traditional methods involve a lot of hardware and complex signal acquisition circuits, system maintenance and upgrades are difficult. Failure of any component may cause the entire system to shut down, requiring a lot of time and resources for repair. With the development of power systems and technological advances, traditional methods are difficult to adapt to new needs and standards, and the scalability and upgrade capabilities of the system are limited.

[0007] Slow response speed: Traditional methods require processing and judging a large number of signals, and the system response speed is slow, which makes it difficult to meet the requirements of real-time control of the power system. In an emergency, the slow response speed may lead to serious consequences. Especially when switching multiple power sources, fast and accurate operation interlocking is crucial, and traditional methods are difficult to achieve efficient interlocking control. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a method for locking the operation of multiple power supply lines based on a standby automatic switching device, which can effectively simplify the signal acquisition process, optimize the logic judgment process, and ensure that the power system can operate safely and stably when multiple power supply lines are connected.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for locking operation of multiple power supply lines based on a backup automatic switching device, comprising the following steps: Step 1: collecting signals, wherein the signals include digital signals and analog signals; Step 2: Determine the closing and locking conditions; Step 3: Perform logical judgment on the standby automatic transfer device; Step 4: The control unit performs an execution operation; Step 5: Output the closing permission condition.

[0010] Preferably, the digital signal acquisition method in step 1 is: (1) Collecting the position status of the circuit breaker: The sensor monitors the mechanical position of the circuit breaker in real time and converts it into a digital signal; the closed state is represented by "1" and the open state is represented by "0". Assume that the position status of circuit breaker 1 is , the position state of circuit breaker 2 is , the position state of circuit breaker 3 is ; (2) Collecting circuit breaker tripping signals: Monitor the circuit breaker tripping signals. When the circuit breaker trips, a specific digital signal is generated. Suppose the tripping signal of circuit breaker 1 is , the trip signal of circuit breaker 2 is , the trip signal of circuit breaker 3 is ; (3) Collect the status signal of the incoming circuit breaker: Collect the opening and closing status of the incoming circuit breaker. Suppose the circuit breaker status of incoming line 1 is , the circuit breaker status of incoming line 2 is ; (4) Collect bus breaker status signal: Collect the open and closed status of the bus breaker. Suppose the breaker status of bus 1 is , the circuit breaker status of bus 2 is ; Preferably, the analog signal acquisition method in step 1 is: (1) Collecting the incoming line voltage: The incoming line voltage is converted into an analog signal through a voltage transformer, and then converted into a digital signal through an analog-to-digital converter. Assume that the voltage of incoming line 1 is , the voltage of incoming line 2 is ; (2) Collecting bus voltage: The bus voltage signal is collected in real time through the sensor. Suppose the voltage of bus 1 is , the voltage of bus 2 is ; (3) Collecting current signals: The current is converted into an analog signal through a current transformer, and then converted into a digital signal through an analog-to-digital converter. Assume that the current of incoming line 1 is , the current of line 2 is .

[0011] Preferably, in step 2, the closing and locking condition judgment includes the following modes: (1) Send first and stop later mode: Assume the new power supply voltage is , the normal voltage range is ; The conditions are: ; Detect the control signal and mechanical position of the new power circuit breaker, and set the state of the new power circuit breaker to , the closing preparation state is represented as "1"; the conditions are: ; Bus voltage Should be within the normal range, set the normal range as ; The conditions are: ; Detect the position status signal of the current running power circuit breaker, and set the current running power circuit breaker status to , the closing state is represented as "1"; the conditions are: ; (2) Stop first and then send mode: Detect the position status signal of the current running power circuit breaker, and set the current running power circuit breaker status to , the opening state is represented as "0"; the conditions are: ; Bus voltage Should be within the normal range, set the normal range as ; The conditions are: ; New supply voltage Satisfy the normal range conditions, set the normal range to ; The conditions are: ; Detect the state of the new power circuit breaker and set the state of the new power circuit breaker to , the closing preparation state is represented as "1"; the conditions are: .

[0012] Preferably, the sub-steps of step 3 are: step 3.1, signal processing: using a low-pass filter to denoise the collected signal to improve the accuracy and stability of the signal; commonly used digital filtering algorithms include low-pass filtering, high-pass filtering and median filtering; for example, the low-pass filter signal processing formula is expressed as: ; in, is the input signal, is the output signal after filtering, is the filter coefficient; Step 3.2: Use the logic judgment algorithm model to perform logical judgment: The input conditions include new power supply voltage, current power supply circuit breaker status, bus voltage and other signals; the logic judgment rules are as follows: Send first and stop later mode: ; Stop first and send later mode: ; Judgment result output: If the judgment result is that the operation is allowed, the output signal is "1", otherwise it is "0"; if the judgment result is ,but: .

[0013] Preferably, the sub-steps of step 4 are: Step 4.1 Control signal output: The control unit determines the result of the automatic switching device. , output control signal ; Control signal Used to drive the circuit breaker to perform corresponding operations; suppose the control signal of circuit breaker 1 is , the control signal of circuit breaker 2 is , the control signal of circuit breaker 3 is ; The output logic of the control signal is:

[0014] Among them, i i Indicates the circuit breaker number (1, 2, 3); Step 4.2, Operation result feedback: After the operation is completed, the control unit will feed back the operation result to the backup automatic switching device; the feedback signal includes the final position state of the circuit breaker and whether the operation is successful. Suppose the feedback signal is ,but: .

[0015] Preferably, the sub-steps of step 5 are as follows: Step 5.1, setting the closing permission node: the standby automatic switching device outputs the closing permission condition as a node and connects it in series to the closing circuit; the state of the output node is determined by the logic judgment result Decision; Set the output node state to ,but:

[0016] Step 5.1, perform closing control: When the closing conditions of the circuit breaker are fully met, the backup automatic transfer device outputs to close the node, allowing the circuit breaker to close; otherwise, closing is not allowed; suppose the closing permission node of circuit breaker 1 is , the closing permission node of circuit breaker 2 is , the closing permission node of circuit breaker 3 is ; Closing control logic is: .

[0017] Preferably, after step 5 is completed, the operation of step 6 is performed: (1) Feedback of operation results: The control unit feeds back the operation results in detail to the backup automatic transfer device, so that the backup automatic transfer device can update the system status in time; the feedback information includes the position status of the circuit breaker, whether the operation is successful, and the system parameters such as voltage and current; (2) System status update: The backup automatic transfer device continues to monitor and make logical judgments based on the latest system status. By continuously updating the system status, the backup automatic transfer device can adjust the logical judgment and control strategy in real time to ensure the stable operation of the power system. Suppose the system status is ,but: .

[0018] A multi-way power supply incoming line operation locking system based on a standby automatic switching device adopts the multi-way power supply incoming line operation locking method based on a standby automatic switching device.

[0019] The present invention can achieve the following beneficial effects: 1. The present invention can comprehensively and accurately grasp the operating status of the power system through precise signal acquisition, including digital signals (circuit breaker position status, tripping signals, incoming line and bus circuit breaker status) and analog signals (incoming line voltage, bus voltage, current signal), and strictly judge the closing and locking conditions. Whether it is a send-first-then-stop mode or a stop-first-then-send mode, the new power supply voltage, bus voltage, circuit breaker status, etc. are confirmed in many aspects to ensure that operations are allowed only when safety conditions are met, greatly reducing the risk of misoperation.

[0020] 2. The signal processing of the automatic switching device adopts efficient digital filtering algorithms, such as low-pass filters, which can quickly remove noise interference, improve the accuracy and stability of the signal, and thus speed up the logic judgment.

[0021] 3. In the closing permission condition output link, the closing permission condition is output as a node and connected in series to the closing circuit. Closing is allowed only when the circuit breaker closing conditions are fully met, otherwise closing is prohibited, which effectively prevents incorrect closing operations caused by human errors or system failures.

[0022] 4. The method of the present invention can effectively simplify the signal acquisition process, optimize the logic judgment process, and ensure that the power system can operate safely and stably when multiple power supply lines are connected. When the factory power supply line is switched, the operation lock can be accurately performed to avoid power system failures caused by improper operation, thereby improving the safety of the power system. Through continuous monitoring and logic judgment, the control strategy can be adjusted in time to adapt to different operating conditions, providing a strong guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a judgment logic flow chart of the present invention; Figure 2 This is a simplified schematic diagram of the main wiring in this embodiment. DETAILED DESCRIPTION

[0024] The preferred solution is Figure 1-2 As shown, a method for locking the operation of multiple power supply lines based on a backup automatic switching device is implemented as follows: Embodiment 1: A power system uses a multi-power supply line operation locking system based on a backup automatic switching device. The system has two incoming power sources and two busbars, corresponding to incoming line 1, incoming line 2, busbar 1 and busbar 2. At the same time, there are three circuit breakers in the system, namely circuit breaker 1, circuit breaker 2 and circuit breaker 3.

[0025] The main connection method adopted is double busbars, two incoming lines and one busbar. When power switching is required, the standby automatic switching device collects the status information of circuit breakers 1DL, 2DL, and 3DL, and collects the incoming line and bus voltage, and determines whether the operation is allowed through logical judgment. The closing conditions are shown in Table 1.

[0026] Table 1 Summary of circuit breaker closing conditions

[0027] 1. Signal acquisition: 1. Digital signal acquisition: The sensor monitors the mechanical position of the circuit breaker in real time to obtain the position status of circuit breaker 1 It is in the open state, that is ; Position status of circuit breaker 2 It is in the closed state, that is ; Position status of circuit breaker 3 It is in the open state, that is .

[0028] Monitor the tripping signal of the circuit breaker. Currently, none of the three circuit breakers have tripped, so the tripping signal of circuit breaker 1 , trip signal of circuit breaker 2 , trip signal of circuit breaker 3 .

[0029] Collect the incoming circuit breaker status signal, the circuit breaker status of incoming line 1 (Indicates open circuit), circuit breaker status of incoming line 2 (Indicates closing the circuit breaker).

[0030] Collect bus breaker status signal, bus 1 circuit breaker status , Bus 2 circuit breaker status .

[0031] 2. Analog signal acquisition: The incoming line voltage is converted into an analog signal through a voltage transformer, and then converted into a digital signal through an analog-to-digital converter. , voltage of incoming line 2 .

[0032] The bus voltage signal is collected in real time by the sensor. The voltage of bus 1 is , the voltage of bus 2 .

[0033] The current is converted into an analog signal through a current transformer, and then converted into a digital signal through an analog-to-digital converter. , the current of line 2 .

[0034] 2. Determination of closing and locking conditions 1. Send first and stop later mode: Assume the new power supply voltage is , the normal voltage range is $[215V, 230V]$. Assume that the new power supply is incoming line 2, and its voltage , meet the normal condition of the new power supply voltage, that is .

[0035] Detect the control signal and mechanical position of the new power circuit breaker (circuit breaker of incoming line 2), and set the state of the new power circuit breaker to ,current (The closing preparation state is indicated as "1").

[0036] Bus voltage It should be within the normal range, which is $[210V, 230V]$. The voltage of bus 1 , the voltage of bus 2 , all satisfy the conditions, namely and .

[0037] Detect the position status signal of the current operating power circuit breaker (assuming it is the circuit breaker of incoming line 1), and set the current operating power circuit breaker status to ,current (open state), the closing state condition of the current operating power circuit breaker is not met.

[0038] 2. Stop first and send later mode: Detect the position status signal of the current operating power circuit breaker (circuit breaker of incoming line 1), and set the current operating power circuit breaker status to ,current (The open state is represented by "0"), the conditions are met.

[0039] Bus voltage It should be within the normal range, set the normal range to [210V, 230V]. Bus 1 voltage , the voltage of bus 2 , all satisfy the conditions, namely and .

[0040] New supply voltage (voltage of incoming line 2) , meets the normal range condition, assuming the normal range is [215V, 230V], that is .

[0041] Detect the status of the new power circuit breaker (circuit breaker of incoming line 2) and set the status of the new power circuit breaker to ,current (The closing preparation state is indicated as "1"), the conditions are met.

[0042] 3. Logical judgment of automatic switching device 1. Signal processing: Use a low-pass filter to denoise the collected signal. Assume that the input signal is The output signal after filtering is , the filter coefficient is The signal processing formula of the low-pass filter is expressed as .

[0043] 2. Logical reasoning: Input conditions include signals such as new power supply voltage, current operating power supply circuit breaker status, bus voltage, etc.

[0044] Send first, stop later mode: If the voltage of the new power supply is normal, the circuit breaker of the new power supply is in the closing preparation state, the bus voltage is normal and the circuit breaker of the current running power supply is closed, the send first, stop later mode is selected. In this embodiment, the conditions of the send first, stop later mode are not met.

[0045] Stop-before-send mode: If the current operating power supply circuit breaker is open, the bus voltage is normal, the new power supply voltage is normal, and the new power supply circuit breaker is in a state of preparation for closing, the stop-before-send mode is selected. In this embodiment, the stop-before-send mode conditions are met.

[0046] Judgment result output: When the judgment result is that the operation is allowed, the output signal is "1", otherwise it is "0". In this embodiment, since the stop-before-delivery mode condition is met, .

[0047] 4. Control unit execution operation 1. Control signal output: The control unit determines the result of the automatic switching device. , output control signal. Assume the control signal of circuit breaker 1 is , the control signal of circuit breaker 2 is , the control signal of circuit breaker 3 is The output logic of the control signal is: If And need to operate the circuit breaker ,but ,otherwise In this embodiment, it is assumed that the circuit breaker 1 needs to be operated for closing operation, so , , .

[0048] 2. Operation result feedback: After the operation is completed, the control unit will feed back the operation result to the backup automatic switching device. The feedback signal includes the final position status of the circuit breaker and whether the operation is successful. Suppose the feedback signal is , assuming the operation is successful and circuit breaker 1 is successfully closed, the feedback signal can be expressed as .

[0049] 5. Closing permission condition output 1. Set the closing permission node: The backup automatic switching device outputs the closing permission condition as a node and connects it in series to the closing circuit. The state of the output node is determined by the logical judgment result. Decision. Let the output node state be ,but In this embodiment, ,so .

[0050] 2. Carry out closing control: When the closing conditions of the circuit breaker are fully met, the backup automatic switching device output closes the node and allows the circuit breaker to close; otherwise, closing is not allowed. Suppose the closing permission node of circuit breaker 1 is , the closing permission node of circuit breaker 2 is , the closing permission node of circuit breaker 3 is The closing control logic is: If If the closing conditions of the corresponding circuit breaker are met, closing is allowed, otherwise closing is not allowed. And the closing condition of circuit breaker 1 is met (assuming that other conditions are met), so circuit breaker 1 is allowed to close.

[0051] 6. System status update 1. Operation result feedback: The control unit will feed back the operation results in detail to the backup automatic transfer device, so that the backup automatic transfer device can update the system status in time. The feedback information includes the position status of the circuit breaker, whether the operation is successful, and the system's voltage, current and other parameters.

[0052] 2. System status update: The backup automatic switch device continues to monitor and make logical judgments based on the latest system status. By continuously updating the system status, the backup automatic switch device can adjust the logical judgment and control strategy in real time to ensure the stable operation of the power system. Assume that the system status is , the system status may include all signal acquisition values, circuit breaker status, logical judgment results and other information. In this embodiment, the updated system status can be expressed as .

[0053] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for locking the operation of multiple power supply lines based on a backup automatic switching device, characterized in that The following steps are involved: Step 1: collecting signals, wherein the signals include digital signals and analog signals; Step 2: Determine the closing and locking conditions; Step 3: Perform logical judgment on the standby automatic transfer device; Step 4: The control unit performs an execution operation; Step 5: Output the closing permission condition.

2. A method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1, characterized in that: The digital signal acquisition method in step 1 is: (1) Collecting the position status of the circuit breaker: The sensor monitors the mechanical position of the circuit breaker in real time and converts it into a digital signal; the closed state is represented by "1" and the open state is represented by "0". Assume that the position status of circuit breaker 1 is , the position state of circuit breaker 2 is , the position state of circuit breaker 3 is ; (2) Collecting circuit breaker tripping signals: Monitor the circuit breaker tripping signals. When the circuit breaker trips, a specific digital signal is generated. Suppose the tripping signal of circuit breaker 1 is , the trip signal of circuit breaker 2 is , the trip signal of circuit breaker 3 is ; (3) Collect the status signal of the incoming circuit breaker: Collect the opening and closing status of the incoming circuit breaker. Suppose the circuit breaker status of incoming line 1 is , the circuit breaker status of incoming line 2 is ; (4) Collect bus breaker status signal: Collect the opening and closing status of the bus breaker. Suppose the breaker status of bus 1 is , the circuit breaker status of bus 2 is .

3. A method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1, characterized in that: The analog signal acquisition method in step 1 is: (1) Collecting the incoming line voltage: The incoming line voltage is converted into an analog signal through a voltage transformer, and then converted into a digital signal through an analog-to-digital converter. Assume that the voltage of incoming line 1 is , the voltage of incoming line 2 is ; (2) Collecting bus voltage: The bus voltage signal is collected in real time through the sensor. Suppose the voltage of bus 1 is , the voltage of bus 2 is ; (3) Collecting current signals: The current is converted into an analog signal through a current transformer, and then converted into a digital signal through an analog-to-digital converter. Assume that the current of incoming line 1 is , the current of line 2 is .

4. A method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1, characterized in that: In step 2, the closing and locking condition judgment includes the following modes: (1) Send first and stop later mode: Assume the new power supply voltage is , the normal voltage range is ; The conditions are: ； Detect the control signal and mechanical position of the new power circuit breaker, and set the state of the new power circuit breaker to , the closing preparation state is represented as "1"; the conditions are: ； Bus voltage Should be within the normal range, set the normal range as ; The conditions are: ； Detect the position status signal of the current running power circuit breaker, and set the current running power circuit breaker status to , the closing state is represented as "1"; the conditions are: ； (2) Stop first and then send mode: Detect the position status signal of the current running power circuit breaker, and set the current running power circuit breaker status to , the opening state is represented as "0"; the conditions are: ； Bus voltage Should be within the normal range, set the normal range as ; The conditions are: ； New supply voltage Satisfy the normal range conditions, set the normal range to ; The conditions are: ； Detect the state of the new power circuit breaker and set the state of the new power circuit breaker to , the closing preparation state is represented as "1"; the conditions are: 。 5. The method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1 is characterized in that: The sub-steps of step 3 are: Step 3.1, perform signal processing: use a low-pass filter to denoise the collected signal. The low-pass filter signal processing formula is expressed as: ； in, is the input signal, is the output signal after filtering, is the filter coefficient; Step 3.2: Use the logic judgment algorithm model to perform logical judgment: The input conditions include new power supply voltage, current power supply circuit breaker status, bus voltage and other signals; the logic judgment rules are as follows: Send first and stop later mode: ； Stop first and send later mode: ； Judgment result output: If the judgment result is that the operation is allowed, the output signal is "1", otherwise it is "0"; if the judgment result is ,but: 。 6. A method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1, characterized in that: The sub-steps of step 4 are: Step 4.1 Control signal output: The control unit determines the result of the automatic switching device. , output control signal ; Control signal Used to drive the circuit breaker to perform corresponding operations; suppose the control signal of circuit breaker 1 is , the control signal of circuit breaker 2 is , the control signal of circuit breaker 3 is ; The output logic of the control signal is: Among them, i i Indicates the circuit breaker number; Step 4.2, Operation result feedback: After the operation is completed, the control unit will feed back the operation result to the backup automatic switching device; the feedback signal includes the final position state of the circuit breaker and whether the operation is successful. Suppose the feedback signal is ,but: 。 7. A method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1, characterized in that: The sub-steps of step 5 are as follows: Step 5.1, set the closing permission node: the standby automatic re-entry device outputs the closing permission condition as a node and connects it in series to the closing circuit; the state of the output node is determined by the logic judgment result decide The output node status is ,but: Step 5.1, perform closing control: When the closing conditions of the circuit breaker are fully met, the backup automatic transfer device outputs to close the node, allowing the circuit breaker to close; otherwise, closing is not allowed; suppose the closing permission node of circuit breaker 1 is , the closing permission node of circuit breaker 2 is , the closing permission node of circuit breaker 3 is ; Closing control logic is: 。 8. The method for locking operation of multiple power supply lines based on a backup automatic switching device according to claim 1, characterized in that: After completing step 5, proceed to step 6: (1) Feedback of operation results: The control unit feeds back the operation results in detail to the backup automatic transfer device, so that the backup automatic transfer device can update the system status in time; the feedback information includes the position status of the circuit breaker, whether the operation is successful, and the system parameters such as voltage and current; (2) System status update: The backup automatic transfer device continues to monitor and make logical judgments based on the latest system status. By continuously updating the system status, the backup automatic transfer device can adjust the logical judgment and control strategy in real time to ensure the stable operation of the power system. Suppose the system status is ,but: 。 9. A multi-power supply line operation locking system based on a backup automatic switching device, characterized in that: A method for locking the operation of multiple power supply lines based on a backup automatic switching device according to any one of claims 1 to 8 is adopted.

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