Switching control method and system based on short-circuit breaker

Abstract

The present invention relates to the technical field of data processing, and discloses a short-circuit breaker-based opening and closing control method and system, which are used to improve the efficiency and accuracy of the opening and closing control based on the short-circuit breaker. The method includes: initializing and setting the protection parameters and circuit breaker control parameters of the DC power supply system to obtain an initialization parameter set; performing fault current simulation calculation on the initialization parameter set to obtain simulated fault current data; real-time monitoring of the simulated fault current data to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact state and number of actions; analyzing and processing the circuit breaker status data to obtain circuit breaker control instructions; processing the circuit breaker status data and the circuit breaker control instructions to obtain performance evaluation results; generating a short-circuit breaker opening and closing control strategy according to the performance evaluation results, and executing it in the DC power supply system to obtain a real-time control instruction set.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a switching control method and system based on a short-circuit breaker. Background Art

[0002] In the existing subway DC power supply system, the opening and closing control of short-circuit circuit breakers is a key link to ensure the safe operation of the system. Traditional control methods mainly rely on fixed protection parameter settings and simple current threshold judgments. These methods usually use the output of millivolt and milliampere generators to verify the opening and closing functions of the protection device, and use external relays to test the opening and closing time of the circuit breaker. In the short-circuit test, an external opening and closing test control button is often used to control the opening and closing of the feeder circuit breaker, and an oscilloscope is used to collect the short-circuit current waveform.

[0003] However, these traditional methods have some obvious shortcomings. First, fixed protection parameter settings are difficult to adapt to complex and changeable operating environments, which may cause the protection device to malfunction or refuse to operate. Second, simple current threshold judgment cannot accurately reflect the real-time status and performance changes of the circuit breaker, affecting the accuracy of control decisions. In addition, the test method using a millivolt milliampere generator and an external relay increases the measurement error and cannot accurately verify the performance of the protection device and circuit breaker. Finally, the method of using an oscilloscope to collect short-circuit waveforms has great limitations, making it difficult to fully record the fault process, which is not conducive to subsequent analysis and diagnosis. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a method and system for opening and closing control based on a short-circuit breaker, which are used to improve the efficiency and accuracy of the opening and closing control based on the short-circuit breaker.

[0005] The present invention provides a short-circuit breaker-based opening and closing control method, comprising: initializing and setting protection parameters and circuit breaker control parameters of a direct current power supply system to obtain an initialization parameter set, wherein the steps of initializing and setting protection parameters and circuit breaker control parameters of the direct current power supply system to obtain an initialization parameter set include: setting DDL protection parameters of the direct current power supply system to obtain DDL protection initial parameters, and performing range verification on the DDL protection initial parameters to obtain effective DDL protection parameters; setting current time-limit protection parameters of the direct current power supply system to obtain current time-limit protection initial parameters, and performing numerical verification on the current time-limit protection initial parameters to obtain effective current time-limit protection parameters; setting reverse flow protection parameters of the direct current power supply system to obtain reverse flow protection initial parameters, and performing threshold adjustment on the reverse flow protection initial parameters to obtain effective reverse flow protection parameters; setting opening and closing time parameters of the short-circuit breaker to obtain opening and closing time initial parameters, and performing range verification on the opening and closing initial parameters to obtain effective The invention relates to a method for generating a circuit breaker by performing a timing analysis on the initial parameters of the circuit breaker time to obtain effective opening and closing time parameters; combining the effective DDL protection parameters, the effective current time-limit protection parameters, the effective reverse current protection parameters and the effective opening and closing time parameters to obtain a candidate parameter combination, and screening the candidate parameter combination through parameter sensitivity analysis to obtain a target parameter combination; performing data format conversion on the target parameter combination to obtain an initialization parameter set; performing fault current simulation calculation on the initialization parameter set to obtain simulated fault current data; performing real-time monitoring on the simulated fault current data to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact status and number of actions; analyzing and processing the circuit breaker status data to obtain circuit breaker control instructions; processing the circuit breaker status data and the circuit breaker control instructions to obtain a performance evaluation result; generating a short-circuit breaker opening and closing control strategy according to the performance evaluation result, and executing it in the DC power supply system to obtain a real-time control instruction set.

[0006] The present invention also provides a short-circuit breaker-based opening and closing control system, comprising:

[0007] The setting module is used to initialize the protection parameters and circuit breaker control parameters of the DC power supply system to obtain the initialization parameter set. The steps of initializing the protection parameters and circuit breaker control parameters of the DC power supply system to obtain the initialization parameter set include: setting the DDL protection parameters of the DC power supply system to obtain the DDL protection initial parameters, and performing range verification on the DDL protection initial parameters to obtain the effective DDL protection parameters; setting the current time-limit protection parameters of the DC power supply system to obtain the current time-limit protection initial parameters, and performing numerical verification on the current time-limit protection initial parameters to obtain the effective current time-limit protection parameters; and performing range verification on the DC power supply system. The reverse current protection parameters are set to obtain the initial parameters of the reverse current protection, and the threshold value of the initial parameters of the reverse current protection is adjusted to obtain the effective reverse current protection parameters; the opening and closing time parameters of the short-circuit breaker are set to obtain the initial parameters of the opening and closing time, and the timing analysis of the initial parameters of the opening and closing time is performed to obtain the effective opening and closing time parameters; the effective DDL protection parameters, the effective current time-limit protection parameters, the effective reverse current protection parameters and the effective opening and closing time parameters are combined to obtain the candidate parameter combination, and the candidate parameter combination is screened through parameter sensitivity analysis to obtain the target parameter combination; the target parameter combination is converted into a data format to obtain an initialization parameter set;

[0008] A calculation module, used for performing fault current simulation calculation on the initialization parameter set to obtain simulated fault current data;

[0009] A monitoring module, used to monitor the simulated fault current data in real time to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact state and number of actions;

[0010] An analysis module, used for analyzing and processing the circuit breaker status data to obtain a circuit breaker control instruction;

[0011] A processing module, used for processing the circuit breaker status data and the circuit breaker control instructions to obtain a performance evaluation result;

[0012] A generation module is used to generate a short-circuit breaker opening and closing control strategy according to the performance evaluation result, and execute it in the DC power supply system to obtain a real-time control instruction set.

[0013] In the technical solution provided by the present invention, by initializing and setting the protection parameters and circuit breaker control parameters of the DC power supply system, an initialization parameter set is obtained, which lays an accurate foundation for subsequent fault simulation and control strategy formulation, and effectively improves the adaptability and reliability of the system. The initialization parameter set is simulated and calculated to obtain simulated fault current data, so that the system can comprehensively evaluate various possible fault conditions without affecting the actual operation, greatly enhancing the preventive and safety of the system. The simulated fault current data is monitored in real time to obtain circuit breaker status data including the opening and closing time, contact state and number of actions. This dynamic monitoring mechanism significantly improves the system's ability to perceive the real-time state of the circuit breaker, and provides the possibility for timely discovery of potential problems. The circuit breaker status data is analyzed and processed to obtain the circuit breaker control instructions, realizing the intelligent conversion from state monitoring to control decision-making, and greatly improving the accuracy and timeliness of control. The circuit breaker status data and control instructions are comprehensively processed to obtain performance evaluation results. Finally, the short-circuit breaker opening and closing control strategy is generated based on the performance evaluation results and executed in the DC power supply system to obtain a real-time control instruction set. This closed-loop control process ensures the dynamic optimization and real-time adjustment of the control strategy, greatly improving the system's adaptability and operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 The present invention is a flow chart of a method for controlling the opening and closing of a short-circuit breaker.

[0016] Figure 2 It is a schematic diagram of a switching control system based on a short-circuit breaker in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1 , Figure 1 is a flow chart of a method for controlling the opening and closing of a short-circuit breaker according to an embodiment of the present invention. Figure 1 As shown, the following steps are included:

[0021] S101, initializing and setting protection parameters and circuit breaker control parameters of a DC power supply system to obtain an initialization parameter set;

[0022] S102, performing fault current simulation calculation on the initialized parameter set to obtain simulated fault current data;

[0023] S103, real-time monitoring of the simulated fault current data to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact state and operation times;

[0024] S104, analyzing and processing the circuit breaker status data to obtain a circuit breaker control instruction;

[0025] S105, processing the circuit breaker status data and the circuit breaker control instructions to obtain a performance evaluation result;

[0026] S106. Generate a short-circuit breaker opening and closing control strategy based on the performance evaluation result, and execute it in the DC power supply system to obtain a real-time control instruction set.

[0027] It should be noted that the protection parameters and circuit breaker control parameters of the DC power supply system are initialized to obtain the initialization parameter set. It involves the setting and verification of parameters such as DDL protection, current time-limited protection and reverse current protection. For example, the DDL protection parameters include the start value E, the return value F, the maximum current increment, the maximum current increment delay, the minimum current increment and the minimum current increment delay. After these parameters are range-checked and numerically verified, they form valid parameters. Subsequently, the initialization parameter set is subjected to fault current simulation calculation to obtain simulated fault current data. In this step, the current rising slope is calculated according to the DDL protection characteristic value to generate the current change rate data; the current amplitude sequence is generated based on the current time-limited protection threshold; and the current reverse sequence is constructed according to the reverse current protection trigger condition. Through numerical integration and segmented fitting, the current time curve and segmented current function are obtained. These data are subjected to electromagnetic transient simulation and digital filtering to finally form simulated fault current data. The simulated fault current data is monitored in real time to obtain the circuit breaker status data. Using high-speed sampling technology, the sampling frequency is usually not less than 10kHz to ensure that the rapidly changing current characteristics are captured. The collected data is subjected to noise removal by a digital signal processing algorithm, and then the current mutation point is identified through threshold detection to determine the circuit breaker action time. By analyzing the circuit breaker action time series, the opening and closing time is calculated, the contact state is determined, and the number of actions is recorded. This information is combined to form the circuit breaker status data. The circuit breaker status data is analyzed and processed to obtain the circuit breaker control instructions. The analysis process includes trend analysis of the opening and closing time to evaluate the mechanical characteristics of the circuit breaker; continuity check of the contact state to evaluate the contact reliability; statistical analysis of the number of actions to predict the life of the circuit breaker. These analysis results are comprehensively evaluated through a multi-factor decision-making algorithm to generate a circuit breaker health index, which in turn determines the control mode and generates control instructions.

[0028] Subsequently, the circuit breaker status data and circuit breaker control instructions are processed to obtain the performance evaluation results. This step involves the evaluation of multiple dimensions such as time performance, control accuracy, reliability and response speed. For example, the distribution characteristics of the opening and closing time are fitted by the time series model to obtain the time performance index; the instruction execution deviation is quantified by the fuzzy evaluation method to obtain the control accuracy index; the contact state change is evaluated by spectrum analysis and signal processing algorithm to obtain the reliability index. These indicators are weighted fused and adaptive threshold graded to form a comprehensive performance score and performance level. Finally, according to the performance evaluation results, the short-circuit breaker opening and closing control strategy is generated and executed in the DC power supply system to obtain a real-time control instruction set. The multi-objective optimization algorithm is used to assign weights to the performance indicators and generate a candidate control strategy set. Through simulation verification and safety evaluation, the control strategies that meet the safety threshold are screened out. These strategies are converted into specific operation sequences, and after sequential logic analysis and optimization, they are encoded into control command data packets. After encryption, the data packets are sent to the control unit of the DC power supply system through the communication interface, and finally form a real-time control instruction set.

[0029] For example, in a certain subway DC power supply system, the initialization parameters set the DDL protection start value E to 2kA / s, the return value F to 1kA / s, the maximum current increment to 3kA, and the maximum current increment delay to 50ms. Based on these parameters, the fault current simulation calculation generates a set of simulated fault current data, with a current rise rate of 2.5kA / s and a duration of 100ms. The real-time monitoring system collects this set of data at a sampling rate of 12kHz. After removing high-frequency noise through digital filtering, it is detected that the current mutation point appears at the 600th data point after sampling, corresponding to a time of 50ms. Analysis shows that the circuit breaker completes the opening action 45ms after detecting the fault, the contact state changes from closed to open, and the cumulative number of actions increases by 1. Based on these status data, the control system generates an emergency opening instruction. The performance evaluation shows that the opening time of this action is 5ms faster than the average level, the control accuracy deviation is within 2%, and the contact reliability index is 0.98. The comprehensive score is 92 points, which belongs to the "excellent" performance level. Based on this, the system generates a new control strategy, slightly increasing the sensitivity of the DDL protection and adjusting the start value E to 1.9kA / s. This adjustment is sent to the control unit via an encrypted data packet and becomes part of the new real-time control instructions to further optimize the system response speed and reliability.

[0030] By executing the above steps, the protection parameters of the DC power supply system and the circuit breaker control parameters are initialized and set to obtain the initialization parameter set, which lays an accurate foundation for the subsequent fault simulation and control strategy formulation, and effectively improves the adaptability and reliability of the system. The fault current simulation calculation is performed on the initialization parameter set to obtain the simulated fault current data, so that the system can comprehensively evaluate various possible fault conditions without affecting the actual operation, greatly enhancing the preventive and safety of the system. The simulated fault current data is monitored in real time to obtain the circuit breaker status data including the opening and closing time, contact state and number of actions. This dynamic monitoring mechanism significantly improves the system's ability to perceive the real-time state of the circuit breaker and provides the possibility for timely discovery of potential problems. The circuit breaker status data is analyzed and processed to obtain the circuit breaker control instructions, realizing the intelligent conversion from state monitoring to control decision-making, and greatly improving the accuracy and timeliness of control. The circuit breaker status data and control instructions are comprehensively processed to obtain the performance evaluation results. Finally, the short-circuit breaker opening and closing control strategy is generated based on the performance evaluation results and executed in the DC power supply system to obtain a real-time control instruction set. This closed-loop control process ensures the dynamic optimization and real-time adjustment of the control strategy, greatly improving the system's adaptability and operating efficiency.

[0031] In a specific embodiment, the process of executing step S101 may specifically include the following steps:

[0032] (1) Set the DDL protection parameters of the DC power supply system to obtain the initial DDL protection parameters, and perform range check on the initial DDL protection parameters to obtain valid DDL protection parameters;

[0033] (2) Setting the current definite time protection parameters of the DC power supply system to obtain the initial parameters of the current definite time protection, and numerically verifying the initial parameters of the current definite time protection to obtain the effective current definite time protection parameters;

[0034] (3) Setting the reverse current protection parameters of the DC power supply system to obtain the initial reverse current protection parameters, and adjusting the thresholds of the initial reverse current protection parameters to obtain effective reverse current protection parameters;

[0035] (4) Setting the opening and closing time parameters of the short-circuit breaker to obtain the initial opening and closing time parameters, and performing a timing analysis on the initial opening and closing time parameters to obtain the effective opening and closing time parameters;

[0036] (5) Combine the effective DDL protection parameters, effective current time-limited protection parameters, effective reverse current protection parameters, and effective opening and closing time parameters to obtain candidate parameter combinations, and screen the candidate parameter combinations through parameter sensitivity analysis to obtain the target parameter combination;

[0037] (6) Convert the target parameter combination into a data format to obtain an initialization parameter set.

[0038] Specifically, the DDL protection parameters of the DC power supply system are set. DDL protection is the main protection in the DC traction power supply system, which detects long-distance short-circuit faults by analyzing the current rise rate di / dt, the current increase duration t and the current increment DI. The setting process includes determining the protection device start value E, return value F, maximum current increment, maximum current increment delay, minimum current increment and minimum current increment delay. These parameters are range-checked to ensure that they are within a reasonable working range, thereby obtaining effective DDL protection parameters. Next, the current time-limit protection parameters of the DC power supply system are set. The current time-limit protection is mainly used to prevent system overload and short-circuit faults. The setting process includes determining the action current value Imax and the action time T. These parameters are numerically verified to ensure that they can correctly respond to the fault current within the specified time, thereby obtaining effective current time-limit protection parameters.

[0039] Then, the reverse current protection parameters of the DC power supply system are set. Reverse current protection is used to prevent equipment damage caused by reverse current flow. The setting process includes determining the action current value and action time of the reverse current protection. These parameters are threshold-adjusted to ensure that they can accurately identify the reverse current state and act in time, thereby obtaining effective reverse current protection parameters. For the opening and closing time parameters of the short-circuit breaker, the setting process includes determining the opening time and closing time of the breaker. These parameters are time-series analyzed to ensure that the breaker can complete the opening and closing operations within the specified time, thereby obtaining effective opening and closing time parameters.

[0040] Combine all the above valid parameters to obtain candidate parameter combinations. Through parameter sensitivity analysis, the influence of each parameter on system performance is evaluated, so as to screen out the optimal target parameter combination. Parameter sensitivity analysis usually uses partial derivative method or perturbation method to calculate the influence of each parameter change on system output.

[0041] Finally, the target parameter combination is converted into a data format, and various protection parameters and time parameters are uniformly converted into a data format recognizable by the system to obtain an initialization parameter set, which will be used for subsequent fault current simulation calculations and circuit breaker control.

[0042] For example, in a certain subway DC power supply system, the initial setting of DDL protection start value E is 2.5kA / s, return value F is 1.5kA / s, maximum current increment is 4kA, maximum current increment delay is 60ms, minimum current increment is 2kA, and minimum current increment delay is 100ms. After range verification, it is confirmed that these values ​​are within the range allowed by the system (such as the effective range of E is 1-5kA / s). The action current value Imax of the current time-limit protection is set to 6kA, and the action time T is set to 200ms. Through numerical verification, it is confirmed that these values ​​can effectively protect the system from overload and short-circuit faults. The action current value of the reverse current protection is set to -1kA (negative value indicates reverse current), and the action time is set to 50ms. After threshold adjustment, it is ensured that the reverse current state can be accurately identified. The opening time of the short-circuit breaker is set to 50ms, and the closing time is set to 100ms. Through timing analysis, it is confirmed that these time parameters meet the system requirements. Through parameter sensitivity analysis, it is found that the start value E of the DDL protection has the greatest impact on system performance, followed by the action current value Imax of the current time-limit protection. According to the analysis results, the E value was fine-tuned to 2.3kA / s and the Imax value was adjusted to 5.8kA to form the final target parameter combination.

[0043] In a specific embodiment, the process of executing step S102 may specifically include the following steps:

[0044] (1) Extract and analyze the DDL protection parameters in the initialization parameter set to obtain the DDL protection characteristic value, and calculate the current rising slope based on the DDL protection characteristic value to obtain the current change rate data;

[0045] (2) extracting the current definite time protection parameters in the initialization parameter set to obtain the current definite time protection threshold, and generating a current amplitude sequence according to the current definite time protection threshold to obtain current amplitude data;

[0046] (3) Extract the reverse current protection parameters in the initialization parameter set to obtain the reverse current protection triggering conditions, and construct a current reverse sequence according to the reverse current protection triggering conditions to obtain current direction data;

[0047] (4) Processing the current change rate data by numerical integration method to obtain the current-time curve, and performing segmented fitting on the current-time curve to obtain the segmented current function;

[0048] (5) The segmented current function, current amplitude data, and current direction data are combined to obtain a comprehensive current characteristic, and the comprehensive current characteristic is simulated by an electromagnetic transient simulation algorithm to obtain a candidate fault current waveform;

[0049] (6) Perform digital filtering on the candidate fault current waveform to obtain simulated fault current data.

[0050] Specifically, DDL protection parameters are extracted from the initialization parameter set, including the start value E, the return value F, the maximum current increment, the maximum current increment delay, the minimum current increment and the minimum current increment delay. These parameters constitute the DDL protection characteristic value, which is used to calculate the current rise slope. The current rise slope is calculated by the differential method, that is, the current change in a short time is divided by the time change to obtain the current change rate data. Next, the current time-limit protection parameters are extracted, mainly including the action current value and the action time. These parameters determine the threshold of the current time-limit protection. According to these thresholds, a series of current amplitudes are generated to form a current amplitude sequence. This sequence reflects the change process from normal working current to fault current and constitutes current amplitude data. Then, the reverse current protection parameters are extracted, including the action current value and action time of the reverse current protection. These parameters define the triggering conditions of the reverse current protection. Based on these conditions, a current reverse sequence is constructed to simulate the change process of the current direction from forward to reverse, and the current direction data is obtained.

[0051] The obtained current change rate data is numerically integrated, and the current change rate is converted into a current change curve over time, i.e., a current time curve, by using a numerical integration algorithm such as the trapezoidal method or the Simpson method. In order to more accurately describe the current change characteristics, the current time curve is segmented and fitted. The fitting process uses a segmented polynomial fitting method to divide the entire curve into multiple intervals, each interval is represented by a polynomial function of different orders, and a segmented current function is obtained. The segmented current function, current amplitude data, and current direction data are combined to form a comprehensive current feature. This comprehensive feature fully reflects the change law of the current under fault conditions. Subsequently, the electromagnetic transient simulation algorithm is used to simulate the comprehensive current feature. The electromagnetic transient simulation algorithm is based on the mathematical model of the power system, taking into account the system's inductance, capacitance and other parameters, and simulating the rapid change process of the current at the moment of the fault to obtain the candidate fault current waveform. Finally, the candidate fault current waveform is digitally filtered. The digital filter uses a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter to remove high-frequency noise and interference in the waveform and obtain smooth simulated fault current data.

[0052] In a specific embodiment, the process of executing step S103 may specifically include the following steps:

[0053] (1) Perform high-speed sampling on the simulated fault current data to obtain a current sampling sequence, and remove noise from the current sampling sequence through a digital signal processing algorithm to obtain filtered current data;

[0054] (2) Perform threshold detection on the filtered current data to obtain the current mutation point, and identify the circuit breaker action time according to the current mutation point to obtain the circuit breaker action time series;

[0055] (3) Perform time interval analysis on the circuit breaker action time series to obtain candidate opening and closing time data, and perform statistical analysis on the candidate opening and closing time data to obtain the opening and closing time;

[0056] (4) Perform state transition analysis on the circuit breaker action time series to obtain the contact state change sequence, and process the contact state change sequence through logical judgment to obtain the contact state;

[0057] (5) Accumulate and count the circuit breaker action time series to obtain the initial value of the action times, and correct the initial value of the action times through data verification to obtain the action times;

[0058] (6) Integrate the data of opening and closing time, contact status and number of operations to obtain circuit breaker status data.

[0059] Specifically, high-speed sampling technology is used to collect simulated fault current data, and the sampling frequency is usually not less than 10kHz to ensure that the rapidly changing current characteristics can be captured. This process obtains a current sampling sequence, and then the sequence is de-noised by a digital signal processing algorithm. Common noise removal methods include median filtering and wavelet transform, which can effectively remove high-frequency noise introduced during the sampling process and obtain filtered current data. Next, the filtered current data is threshold detected to identify the current mutation point. Threshold detection usually uses a dynamic threshold method to dynamically adjust the threshold according to the historical data of the current to adapt to different working conditions. When the current value is detected to exceed the set threshold, it is considered that a current mutation point has occurred. Based on these mutation points, the action moment of the circuit breaker can be identified, thereby obtaining the circuit breaker action time series.

[0060] Perform time interval analysis on the circuit breaker action time series, calculate the intervals between adjacent action time points, and obtain candidate opening and closing time data. These data reflect the time required for the circuit breaker to complete the corresponding action from receiving the opening or closing command. Perform statistical analysis and processing on the candidate opening and closing time data, such as calculating statistical quantities such as the average value and standard deviation, and finally obtain representative opening and closing time. At the same time, perform state transition analysis on the circuit breaker action time series, observe the changes in the circuit breaker state at different times, and obtain the contact state change sequence. This sequence reflects the process of the circuit breaker contacts from closing to opening, or from opening to closing. Process the contact state change sequence through logical judgment, such as judging the integrity and rationality of the state transition, and finally obtain the current contact state.

[0061] In addition, the circuit breaker action time series is counted cumulatively to obtain the initial value of the number of actions. This initial value reflects the total number of operations of the circuit breaker. Then, the initial value of the number of actions is corrected through data verification, such as considering the maintenance record of the circuit breaker, the replacement of parts, etc., to obtain a more accurate number of actions. Finally, the opening and closing time, contact status and number of actions are integrated to form complete circuit breaker status data. These data fully reflect the working status and performance characteristics of the circuit breaker, providing an important basis for the subsequent control strategy formulation.

[0062] For example, in the short-circuit breaker monitoring process of a DC power supply system, the simulated fault current data is sampled at a sampling frequency of 20kHz, and a total of 20,000 sampling points are obtained within 1 second. Wavelet transform is applied to these sampling points for denoising, and the db4 wavelet is selected with a decomposition layer of 3, which effectively removes high-frequency noise. Threshold detection is performed on the denoised data, and the dynamic threshold is set to 150% of the current average current value within the current 1ms. It is detected that the current value suddenly rises above the threshold at the 5000th sampling point (i.e., 250ms), which is identified as the circuit breaker action moment. By analyzing the circuit breaker action time series, it is found that the time interval between two adjacent actions is 50ms, and this value is used as a candidate opening and closing time. Through statistical analysis of 10 operations, the average opening time is calculated to be 48ms, with a standard deviation of 2ms. State transition analysis shows that the contact state changes from closed to open, and it takes 3ms to complete the state transition. The cumulative count shows that the circuit breaker has been operated 9999 times. Considering that the operating mechanism was replaced during the last maintenance, the count value is corrected to 100 times. The final integrated circuit breaker status data is: opening time 48ms, closing time 52ms, current contact status is disconnected, and the cumulative number of operations is 100 times.

[0063] In a specific embodiment, the process of executing step S104 may specifically include the following steps:

[0064] (1) Perform trend analysis on the opening and closing time in the circuit breaker status data to obtain the time change trend, and judge the mechanical characteristics of the circuit breaker based on the time change trend to obtain the mechanical performance evaluation results;

[0065] (2) Perform continuity check on the contact state in the circuit breaker status data to obtain the state transition sequence, and analyze the state transition sequence through the state machine model to obtain the contact reliability index;

[0066] (3) Statistically analyze the number of actions in the circuit breaker status data to obtain the usage frequency data, and calculate the circuit breaker life consumption rate based on the usage frequency data to obtain the life prediction result;

[0067] (4) Based on the mechanical performance evaluation results, contact reliability index and life prediction results, a circuit breaker health status evaluation matrix is ​​constructed, and the health status evaluation matrix is ​​processed through a multi-factor decision-making algorithm to obtain the circuit breaker health index;

[0068] (5) Compare the thresholds of the circuit breaker health index to obtain the basis for selecting the control strategy, and determine the control mode based on the basis for selecting the control strategy to obtain the control mode parameters;

[0069] (6) Generate a corresponding operation instruction sequence according to the control mode parameters to obtain a preliminary control instruction, and perform safety verification on the preliminary control instruction to obtain a circuit breaker control instruction.

[0070] Specifically, the trend analysis of the opening and closing time in the circuit breaker status data is performed, and the time variation trend is obtained by using the linear regression method. Assume that the opening and closing time series is , the corresponding time point is , then the linear regression equation is:

[0071]

[0072] in, is the slope, is the intercept. Solved by the least squares method and ,get:

[0073]

[0074]

[0075] Slope It reflects the speed of change of the opening and closing time and is used to judge the degradation degree of the mechanical characteristics of the circuit breaker, so as to obtain the mechanical performance evaluation results. The contact state in the circuit breaker state data is checked for continuity to obtain the state transition sequence. The three-state Markov chain model is used to analyze the state transition sequence, and the state space is , respectively represent the closed, open and intermediate states. The state transition probability matrix P is:

[0076]

[0077] in, Indicates from the state Transfer to state The probability of a circuit breaker failure. By counting the number of transitions in the state transition sequence and calculating the probability of each transition, the contact reliability index is obtained. Then, the number of actions in the circuit breaker state data is statistically analyzed to obtain the frequency of use data. Assuming that the rated life of the circuit breaker is N operations and n operations have been performed, the life consumption rate R is calculated as follows:

[0078]

[0079] According to the life consumption rate, combined with the use environment and load conditions of the circuit breaker, the Weibull distribution model is used to predict the remaining life and obtain the life prediction results. Based on the mechanical performance evaluation results, contact reliability indicators and life prediction results, the circuit breaker health status evaluation matrix H is constructed:

[0080]

[0081] in, , , are the weights of mechanical performance, contact reliability and life prediction, , , The analytic hierarchy process (AHP) is used to process the health status evaluation matrix to obtain the circuit breaker health index. :

[0082]

[0083] The thresholds of the circuit breaker health index are compared, and different health status intervals are set to obtain the basis for the control strategy selection. According to the selection basis, the control mode is determined, such as normal mode, enhanced monitoring mode or emergency maintenance mode, and the corresponding control mode parameters are obtained. Finally, the operation instruction sequence is generated according to the control mode parameters to obtain the preliminary control instructions. The preliminary control instructions are verified for safety, including instruction legitimacy check and execution risk assessment, and finally the circuit breaker control instructions are obtained.

[0084] For example, the opening time data (unit: ms) of the short-circuit breaker of a DC power supply system in the past 100 operations are: [48, 49, 50, 51, 52, ..., 58]. Through linear regression analysis, the slope a = 0.1 is obtained, indicating that the average opening time of each operation increases by 0.1ms. Based on this, the mechanical performance is evaluated to be slowly degrading. The contact state transition sequence analysis shows that the transition probability from closed to open is =0.99, the transition probability from open to closed =0.98, the calculated contact reliability index is 0.985. The rated life of the circuit breaker is 10,000 operations, and 9,000 operations have been performed so far, with a life consumption rate of 90%. A health status assessment matrix is ​​constructed with weights of 0.4, 0.3, and 0.3, respectively. The assessment scores are 85, 90, and 75, and the calculated health index HI=83.5 is obtained. The index is in the "good" range (80-90 points), and the "normal operation + enhanced monitoring" control mode is selected. According to this mode, an operation instruction sequence is generated, including "daily self-test", "periodic load test", etc., and the final circuit breaker control instruction is formed after safety verification.

[0085] In a specific embodiment, the process of executing step S105 may specifically include the following steps:

[0086] (1) Perform statistical analysis on the opening and closing time in the circuit breaker status data to obtain the time distribution characteristics, and fit the time distribution characteristics through the time series model to obtain the time performance index;

[0087] (2) Compare the execution results of the circuit breaker control instructions with the expected targets to obtain the instruction execution deviation, and quantify the instruction execution deviation through the fuzzy evaluation method to obtain the control accuracy index;

[0088] (3) performing spectrum analysis on the contact state changes in the circuit breaker state data to obtain a state transition frequency spectrum, and extracting features from the state transition frequency spectrum through a signal processing algorithm to obtain a reliability index;

[0089] (4) calculating the response delay according to the timestamps of the circuit breaker status data and the circuit breaker control instructions to obtain a delay time series, and processing the delay time series by a statistical method to obtain a response speed index;

[0090] (5) Perform weighted fusion on the time performance index, control accuracy index, reliability index and response speed index to obtain a comprehensive performance score, and then classify the comprehensive performance score through an adaptive threshold algorithm to obtain a performance grade;

[0091] (6) Generate a performance evaluation report based on the performance level and preset evaluation criteria, and perform data compression and format conversion on the performance evaluation report to obtain the performance evaluation results.

[0092] Specifically, the opening and closing time in the circuit breaker status data is statistically analyzed to obtain the time distribution characteristics. This includes calculating statistics such as the average opening and closing time, standard deviation, and distribution morphology. Then, these characteristics are fitted through a time series model. Commonly used models include the autoregressive moving average model (ARMA) or the autoregressive integrated moving average model (ARIMA). By analyzing the model parameters and fitting errors, the time performance index reflecting the stability and trend of the circuit breaker opening and closing time is obtained. Next, the execution results of the circuit breaker control instructions are compared with the expected goals to obtain the instruction execution deviation. This step involves comparing parameters such as the actual execution time with the preset time, the actual action current with the set current, etc. These deviations are quantified through the fuzzy evaluation method. The fuzzy evaluation process includes establishing an evaluation factor set, a comment set, determining the membership function, constructing a fuzzy relationship matrix, and finally obtaining the control accuracy index through fuzzy synthesis.

[0093] Spectral analysis of contact state changes in circuit breaker status data is an important means of evaluating reliability. The fast Fourier transform (FFT) algorithm is used to convert the contact state change signal in the time domain into a state transition frequency spectrum in the frequency domain. Then, the spectrum is feature extracted by the signal processing algorithm, such as extracting feature quantities such as the main frequency component and harmonic ratio. These feature quantities reflect the stability and regularity of the contact state changes, and the reliability index is calculated based on this. According to the timestamps of the circuit breaker status data and the circuit breaker control instructions, the response delay is calculated to obtain the delay time series. This step involves comparing the difference between the time when the control instruction is issued and the actual action time of the circuit breaker. The delay time series is processed by statistical methods, such as calculating statistical quantities such as the average delay time and variance, so as to obtain an indicator reflecting the response speed of the circuit breaker.

[0094] The time performance index, control accuracy index, reliability index and response speed index are weighted and fused to obtain a comprehensive performance score. The weighted fusion process takes into account the importance and mutual influence of each index, and usually uses the analytic hierarchy process (AHP) or fuzzy comprehensive evaluation method to determine the weight. Then, the comprehensive performance score is graded by the adaptive threshold algorithm. The adaptive threshold algorithm dynamically adjusts the grading criteria based on historical data to ensure the accuracy and adaptability of the rating results. Finally, a detailed performance evaluation report is generated based on the performance level and the preset evaluation criteria. The report contains specific values, trend charts and analysis conclusions of each indicator. In order to facilitate storage and transmission, the report is compressed and format converted. Commonly used compression algorithms include lossless compression algorithms (such as Huffman coding) or lossy compression algorithms (such as wavelet transform). The format conversion selects the appropriate data format according to system requirements.

[0095] For example, in a DC power supply system, the short-circuit breaker has a trip time series (unit: ms) of [48, 49, 50, 51, 52, ..., 58] in 100 consecutive operations. Statistical analysis shows that the average trip time is 53ms and the standard deviation is 2ms. Through ARIMA model fitting, the time series model parameters are obtained, and the next trip time is predicted to be 54ms. Based on this, the time performance index is calculated to be 0.95 (full score 1.0). The control instruction execution deviation analysis shows that the average deviation is 2%. Through the fuzzy evaluation method, the evaluation factor set {execution time deviation, action current deviation} and the comment set {excellent, good, general, poor} are established. After constructing the fuzzy relationship matrix, the control accuracy index is 0.92. The FFT analysis results of the contact state change show that the main frequency component is 50Hz and the harmonic ratio is less than 5%. Through the feature extraction algorithm, the reliability index is calculated to be 0.98. The statistical analysis results of the response delay time series are: average delay time 5ms, standard deviation 1ms, based on which the response speed index is 0.96.

[0096] The four indicators are weighted and fused, with weights of 0.3, 0.3, 0.2, and 0.2, respectively, and the comprehensive performance score is calculated to be 0.952. Through the adaptive threshold algorithm, 0.9-1.0 is classified as "excellent" level, so the performance level of this circuit breaker is "excellent". Based on these analysis results, a performance evaluation report with detailed data and charts is generated. The report includes a trend chart of the opening and closing time, a radar chart of the control accuracy, a spectrum chart of the contact state, and a distribution chart of the response delay. The report is compressed using Huffman coding with a compression rate of 60%, and converted into XML format for easy system parsing and storage.

[0097] In a specific embodiment, the process of executing step S106 may specifically include the following steps:

[0098] (1) Analyze the performance evaluation results to obtain a set of performance indicators, and assign weights to the set of performance indicators through a multi-objective optimization algorithm to obtain an indicator weight vector;

[0099] (2) Generate a candidate control strategy set based on the indicator weight vector and the preset control strategy template, and verify the candidate control strategy set through the simulation model to obtain a feasible control strategy;

[0100] (3) Conduct a safety assessment on the feasible control strategies to obtain a safety score, and select the control strategies that meet the safety threshold based on the safety score to obtain a safe control strategy;

[0101] (4) Convert the safety control strategy into a specific operation sequence to obtain an execution instruction set, and optimize the execution instruction set through timing logic analysis to obtain an optimized instruction sequence;

[0102] (5) Encode the optimized instruction sequence to obtain a control command data packet, and encrypt the control command data packet through an encryption algorithm to obtain secure communication data;

[0103] (6) The safety communication data is sent to the control unit of the DC power supply system through the communication interface to obtain execution confirmation information, and the control state is updated according to the execution confirmation information to obtain a real-time control instruction set.

[0104] Specifically, key performance indicators, such as the opening and closing time, contact state reliability, and number of actions, are extracted from the performance evaluation results to form a set of performance indicators. Then, a multi-objective optimization algorithm is used to assign weights to these indicators. The multi-objective optimization algorithm takes into account the mutual influence and importance of each indicator, and obtains the optimal weight allocation scheme through iterative calculation to form an indicator weight vector. A series of candidate control strategies are generated based on the obtained indicator weight vector and the pre-set control strategy template. The control strategy template contains standard operating procedures and parameter settings under different working conditions. By matching and adjusting the indicator weight vector with the parameters in the template, a set of candidate control strategies that adapt to the current circuit breaker state is formed. Then, these candidate strategies are verified using a simulation model. The simulation model simulates the action characteristics of the circuit breaker under different working conditions, and by comparing the simulation results with the expected performance, feasible control strategies that meet the requirements are screened out.

[0105] Safety assessment of feasible control strategies is a key step to ensure the safe operation of circuit breakers. The assessment process takes into account multiple aspects such as electrical safety, mechanical reliability and system coordination, and calculates a safety score for each strategy. According to the preset safety threshold, the control strategies that meet the requirements are screened out to form a set of safety control strategies. Converting safety control strategies into specific operation sequences is the key to achieving control. This process converts abstract strategies into specific instructions that can be executed by circuit breakers, such as opening, closing, self-testing, etc., to form an execution instruction set. The execution instruction set is optimized through sequential logic analysis to ensure that the execution order and time interval of the instruction sequence meet the action characteristics and safety requirements of the circuit breaker, and obtain an optimized instruction sequence.

[0106] Encoding the optimized instruction sequence is a necessary step to achieve remote control. The encoding process converts the instructions into a standard data format for easy transmission and parsing. The encoded data forms a control command data packet. To ensure the security of data transmission, an encryption algorithm is used to process the control command data packet. The encryption process uses a high-intensity encryption algorithm, such as AES or RSA, to ensure that the data is not illegally intercepted or tampered with during transmission, and finally obtains secure communication data. The secure communication data is sent to the control unit of the DC power supply system through a dedicated communication interface. After receiving the data, the control unit decrypts and verifies it and performs the corresponding control operation. After the execution is completed, the control unit will return the execution confirmation information, which includes the completion status and key parameters of the operation. According to these execution confirmation information, the control state of the circuit breaker is updated to form a real-time control instruction set, which provides a basis for the next control decision.

[0107] For example, the performance evaluation results of the short-circuit breaker of a subway DC power supply system showed that the opening time was 48ms, the closing time was 52ms, the contact reliability index was 0.98, and the cumulative number of operations was 9500. Through the multi-objective optimization algorithm, the index weight vector was obtained: [0.3, 0.3, 0.2, 0.2], corresponding to the opening and closing time, contact reliability, number of operations and response speed, respectively. According to these weights and preset templates, three candidate control strategies were generated: standard mode, fast response mode and delayed protection mode. Through simulation verification, the fast response mode can shorten the opening time to 45ms while ensuring safety, and was selected as a feasible control strategy. The safety assessment gave the strategy a score of 0.95 (full score 1.0), which is higher than the preset safety threshold of 0.9, so it was determined to be a safe control strategy.

[0108] The strategy is converted into a specific operation sequence, including pre-charging (10ms), main contact closure (5ms), auxiliary contact confirmation (5ms), and keeping the circuit activated (continuous). Sequential logic analysis optimizes the execution order and time interval of these steps to form the final optimized instruction sequence. The instruction sequence is encoded to form a 16-bit control command, such as "1010110001100101". The command is encrypted using the AES-256 encryption algorithm to obtain a 128-bit ciphertext. This encrypted data is sent to the control unit through a dedicated optical fiber communication interface. After the control unit executes the instruction, it returns a confirmation message: "The operation is successful, the actual opening time is 46ms, and the contact status is normal." Based on this information, the control state of the circuit breaker is updated, and the actual opening time is recorded as 46ms, providing more accurate reference data for the next control decision.

[0109] The embodiment of the present invention also provides a switching control system based on a short-circuit breaker, such as Figure 2As shown, the opening and closing control system based on the short-circuit circuit breaker specifically includes:

[0110] A setting module 201 is used to initialize the protection parameters and circuit breaker control parameters of the DC power supply system to obtain an initialization parameter set;

[0111] A calculation module 202, configured to perform fault current simulation calculation on the initialization parameter set to obtain simulated fault current data;

[0112] A monitoring module 203 is used to monitor the simulated fault current data in real time to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact status and operation times;

[0113] An analysis module 204 is used to analyze and process the circuit breaker status data to obtain a circuit breaker control instruction;

[0114] A processing module 205 is used to process the circuit breaker status data and the circuit breaker control instructions to obtain a performance evaluation result;

[0115] The generating module 206 is used to generate a short-circuit breaker opening and closing control strategy according to the performance evaluation result, and execute it in the DC power supply system to obtain a real-time control instruction set.

[0116] Through the collaborative work of the above modules, the protection parameters of the DC power supply system and the circuit breaker control parameters are initialized and set to obtain the initialization parameter set, which lays an accurate foundation for the subsequent fault simulation and control strategy formulation, and effectively improves the adaptability and reliability of the system. The fault current simulation calculation is performed on the initialization parameter set to obtain the simulated fault current data, so that the system can comprehensively evaluate various possible fault conditions without affecting the actual operation, greatly enhancing the preventive and safety of the system. The simulated fault current data is monitored in real time to obtain the circuit breaker status data including the opening and closing time, contact state and number of actions. This dynamic monitoring mechanism significantly improves the system's ability to perceive the real-time state of the circuit breaker and provides the possibility for timely discovery of potential problems. The circuit breaker status data is analyzed and processed to obtain the circuit breaker control instructions, realizing the intelligent conversion from state monitoring to control decision-making, and greatly improving the accuracy and timeliness of control. The circuit breaker status data and control instructions are comprehensively processed to obtain the performance evaluation results. Finally, the short-circuit breaker opening and closing control strategy is generated based on the performance evaluation results and executed in the DC power supply system to obtain a real-time control instruction set. This closed-loop control process ensures the dynamic optimization and real-time adjustment of the control strategy, greatly improving the system's adaptability and operating efficiency.

[0117] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the embodiments, a person skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for controlling the opening and closing of a short-circuit breaker, characterized in that: include: Initialize and set the protection parameters and circuit breaker control parameters of the DC power supply system to obtain an initialization parameter set. The steps of initializing and setting the protection parameters and circuit breaker control parameters of the DC power supply system to obtain the initialization parameter set include: setting the DDL protection parameters of the DC power supply system to obtain the DDL protection initial parameters, and performing range verification on the DDL protection initial parameters to obtain valid DDL protection parameters; setting the current time-limit protection parameters of the DC power supply system to obtain the current time-limit protection initial parameters, and performing numerical verification on the current time-limit protection initial parameters to obtain valid current time-limit protection parameters; and performing reverse current protection verification on the DC power supply system. The protection parameters are set to obtain the initial parameters of the reverse current protection, and the threshold value of the initial parameters of the reverse current protection is adjusted to obtain the effective reverse current protection parameters; the opening and closing time parameters of the short-circuit breaker are set to obtain the initial parameters of the opening and closing time, and the timing analysis of the initial parameters of the opening and closing time is performed to obtain the effective opening and closing time parameters; the effective DDL protection parameters, the effective current time-limit protection parameters, the effective reverse current protection parameters and the effective opening and closing time parameters are combined to obtain the candidate parameter combination, and the candidate parameter combination is screened through parameter sensitivity analysis to obtain the target parameter combination; the target parameter combination is converted into a data format to obtain an initialization parameter set; Performing fault current simulation calculation on the initialization parameter set to obtain simulated fault current data; Performing real-time monitoring on the simulated fault current data to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact status and number of actions; The circuit breaker status data is analyzed and processed to obtain a circuit breaker control instruction, including: performing a trend analysis on the opening and closing time in the circuit breaker status data to obtain a time change trend, and judging the mechanical characteristics of the circuit breaker according to the time change trend to obtain a mechanical performance evaluation result; performing a continuity check on the contact state in the circuit breaker status data to obtain a state transition sequence, and analyzing the state transition sequence through a state machine model to obtain a contact reliability index; performing a statistical analysis on the number of actions in the circuit breaker status data to obtain usage frequency data, and calculating the circuit breaker according to the usage frequency data. life consumption rate, and obtain life prediction results; construct a circuit breaker health status evaluation matrix according to the mechanical performance evaluation results, contact reliability indicators and life prediction results, and process the health status evaluation matrix through a multi-factor decision-making algorithm to obtain a circuit breaker health index; compare the circuit breaker health index with a threshold value to obtain a control strategy selection basis, and determine a control mode according to the control strategy selection basis to obtain a control mode parameter; generate a corresponding operation instruction sequence according to the control mode parameter to obtain a preliminary control instruction, and perform safety verification on the preliminary control instruction to obtain a circuit breaker control instruction; Processing the circuit breaker status data and the circuit breaker control instructions to obtain a performance evaluation result; According to the performance evaluation result, a short-circuit breaker opening and closing control strategy is generated and executed in the DC power supply system to obtain a real-time control instruction set.

2. The method for controlling the opening and closing of a short-circuit breaker according to claim 1, characterized in that: The step of performing fault current simulation calculation on the initialization parameter set to obtain simulated fault current data includes: Extracting and analyzing the DDL protection parameters in the initialization parameter set to obtain a DDL protection characteristic value, and calculating the current rising slope according to the DDL protection characteristic value to obtain current change rate data; Extracting the current definite time protection parameter in the initialization parameter set to obtain the current definite time protection threshold, and generating a current amplitude sequence according to the current definite time protection threshold to obtain current amplitude data; Extracting the reverse flow protection parameters in the initialization parameter set to obtain the reverse flow protection triggering condition, and constructing a current reverse sequence according to the reverse flow protection triggering condition to obtain current direction data; The current change rate data is processed by a numerical integration method to obtain a current time curve, and the current time curve is fitted piecewise to obtain a piecewise current function; The segmented current function, the current amplitude data and the current direction data are combined to obtain a comprehensive current feature, and the comprehensive current feature is simulated by an electromagnetic transient simulation algorithm to obtain a candidate fault current waveform; The candidate fault current waveform is digitally filtered to obtain simulated fault current data.

3. The method for controlling the opening and closing of a short-circuit breaker according to claim 1, characterized in that: The step of monitoring the simulated fault current data in real time to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact state and action times, comprises: Performing high-speed sampling on the simulated fault current data to obtain a current sampling sequence, and removing noise from the current sampling sequence through a digital signal processing algorithm to obtain filtered current data; Performing threshold detection on the filtered current data to obtain a current mutation point, and identifying a circuit breaker action time according to the current mutation point to obtain a circuit breaker action time series; Performing time interval analysis on the circuit breaker action time series to obtain candidate opening and closing time data, and performing statistical analysis on the candidate opening and closing time data to obtain the opening and closing time; Performing state conversion analysis on the circuit breaker action time sequence to obtain a contact state change sequence, and processing the contact state change sequence through logical judgment to obtain a contact state; Accumulating and counting the circuit breaker action time series to obtain an initial value of the number of actions, and correcting the initial value of the number of actions through data verification to obtain the number of actions; The opening and closing time, the contact state and the number of actions are integrated to obtain circuit breaker state data.

4. The method for controlling the opening and closing of a short-circuit breaker according to claim 1, characterized in that: The step of processing the circuit breaker status data and the circuit breaker control instruction to obtain a performance evaluation result includes: Performing statistical analysis on the opening and closing time in the circuit breaker status data to obtain time distribution characteristics, and fitting the time distribution characteristics through a time series model to obtain a time performance index; Comparing the execution result of the circuit breaker control instruction with the expected target to obtain the instruction execution deviation, and quantifying the instruction execution deviation through a fuzzy evaluation method to obtain a control accuracy index; Performing spectrum analysis on the contact state changes in the circuit breaker state data to obtain a state transition frequency spectrum, and performing feature extraction on the state transition frequency spectrum through a signal processing algorithm to obtain a reliability index; Calculating the response delay according to the circuit breaker status data and the timestamp of the circuit breaker control instruction to obtain a delay time series, and processing the delay time series by a statistical method to obtain a response speed index; Performing weighted fusion on the time performance index, control accuracy index, reliability index and response speed index to obtain a comprehensive performance score, and grading the comprehensive performance score through an adaptive threshold algorithm to obtain a performance grade; A performance evaluation report is generated according to the performance level and the preset evaluation standard, and data compression and format conversion are performed on the performance evaluation report to obtain a performance evaluation result.

5. The method for controlling the opening and closing of a short-circuit breaker according to claim 4, characterized in that: The step of generating a short-circuit breaker opening and closing control strategy according to the performance evaluation result and executing it in the DC power supply system to obtain a real-time control instruction set comprises: Analyzing the performance evaluation results to obtain a performance indicator set, and assigning weights to the performance indicator set through a multi-objective optimization algorithm to obtain an indicator weight vector; Generate a candidate control strategy set according to the indicator weight vector and a preset control strategy template, and verify the candidate control strategy set through a simulation model to obtain a feasible control strategy; Performing a safety assessment on the feasible control strategies to obtain a safety score, and screening out control strategies that meet a safety threshold based on the safety score to obtain a safety control strategy; Converting the security control strategy into a specific operation sequence to obtain an execution instruction set, and optimizing the execution instruction set through sequential logic analysis to obtain an optimized instruction sequence; Encoding the optimized instruction sequence to obtain a control command data packet, and encrypting the control command data packet through an encryption algorithm to obtain secure communication data; The safety communication data is sent to the control unit of the DC power supply system through the communication interface to obtain execution confirmation information, and the control state is updated according to the execution confirmation information to obtain a real-time control instruction set.

6. A short-circuit breaker-based opening and closing control system, used to execute the short-circuit breaker-based opening and closing control method according to any one of claims 1 to 5, characterized in that: include: The setting module is used to initialize the protection parameters and circuit breaker control parameters of the DC power supply system to obtain the initialization parameter set. The steps of initializing the protection parameters and circuit breaker control parameters of the DC power supply system to obtain the initialization parameter set include: setting the DDL protection parameters of the DC power supply system to obtain the DDL protection initial parameters, and performing range verification on the DDL protection initial parameters to obtain the effective DDL protection parameters; setting the current time-limit protection parameters of the DC power supply system to obtain the current time-limit protection initial parameters, and performing numerical verification on the current time-limit protection initial parameters to obtain the effective current time-limit protection parameters; and performing range verification on the DC power supply system. The reverse current protection parameters are set to obtain the initial parameters of the reverse current protection, and the threshold value of the initial parameters of the reverse current protection is adjusted to obtain the effective reverse current protection parameters; the opening and closing time parameters of the short-circuit breaker are set to obtain the initial parameters of the opening and closing time, and the timing analysis of the initial parameters of the opening and closing time is performed to obtain the effective opening and closing time parameters; the effective DDL protection parameters, the effective current time-limit protection parameters, the effective reverse current protection parameters and the effective opening and closing time parameters are combined to obtain the candidate parameter combination, and the candidate parameter combination is screened through parameter sensitivity analysis to obtain the target parameter combination; the target parameter combination is converted into a data format to obtain an initialization parameter set; A calculation module, used for performing fault current simulation calculation on the initialization parameter set to obtain simulated fault current data; A monitoring module, used to monitor the simulated fault current data in real time to obtain circuit breaker status data, wherein the circuit breaker status data includes opening and closing time, contact state and number of actions; The analysis module is used to analyze and process the circuit breaker status data to obtain the circuit breaker control instruction, including: performing trend analysis on the opening and closing time in the circuit breaker status data to obtain the time change trend, and judging the mechanical characteristics of the circuit breaker according to the time change trend to obtain the mechanical performance evaluation result; performing continuity check on the contact state in the circuit breaker status data to obtain the state transition sequence, and analyzing the state transition sequence through the state machine model to obtain the contact reliability index; performing statistical analysis on the number of actions in the circuit breaker status data to obtain the usage frequency data, and calculating according to the usage frequency data The circuit breaker life consumption rate is calculated to obtain a life prediction result; a circuit breaker health status evaluation matrix is ​​constructed according to the mechanical performance evaluation results, the contact reliability index and the life prediction result, and the health status evaluation matrix is ​​processed by a multi-factor decision-making algorithm to obtain a circuit breaker health index; a threshold comparison is performed on the circuit breaker health index to obtain a control strategy selection basis, and a control mode is determined according to the control strategy selection basis to obtain a control mode parameter; a corresponding operation instruction sequence is generated according to the control mode parameter to obtain a preliminary control instruction, and the preliminary control instruction is safety verified to obtain a circuit breaker control instruction; A processing module, used for processing the circuit breaker status data and the circuit breaker control instructions to obtain a performance evaluation result; A generation module is used to generate a short-circuit breaker opening and closing control strategy according to the performance evaluation result, and execute it in the DC power supply system to obtain a real-time control instruction set.

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