A method for optimizing arc extinguishing performance of AC contactor

Abstract

The present invention discloses a method for optimizing the arc extinguishing performance of an AC contactor, which relates to the fields of power engineering and electrical control technology. The method is used to solve the problem of insufficient judgment on the current control strategy in scenarios where multiple control strategies coexist and there are complex load fluctuations. The method dynamically determines the optimal control mode by real-time monitoring and standardized processing of trigger time and current signals, combined with a control speed evaluation mechanism; realizes multi-dimensional data database building of the control mode by setting a marking time and a classification marking mechanism, and identifies advanced joint control modes in combination with joint control rules, thereby improving the adaptability of the control strategy; realizes comprehensive evaluation and dynamic sorting of the stability and energy efficiency performance of the control mode by setting a sliding window to calculate the control speed fluctuation rate and the control electric energy, thereby improving the accuracy of the arc extinguishing response of the AC contactor.

Description

Technical Field

[0001] The present invention relates to the field of power engineering and electrical control technology, and more particularly to a method for optimizing arc extinguishing performance of an AC contactor. Background Art

[0002] AC contactors, as the most commonly used power switching devices in electrical control systems, are widely used in industrial automation, power systems, smart buildings and other fields. They are used to achieve remote control and frequent on-off operations of high-power electrical loads. During the on-off process of the AC contactor, arcing is very likely to occur between the contact points due to the voltage difference and the influence of inductive load. The arc not only causes ablation and welding of the contact material of the contactor, but may also cause system short circuits, equipment failures and even safety accidents.

[0003] The existing technology has the following deficiencies:

[0004] In the current implementation method, the dynamic correlation between the control mode and the actual arc extinguishing performance is not fully considered. Especially in the scenario where multiple control strategies coexist and the load fluctuates complexly, it is difficult to quickly and accurately judge whether the current control strategy is optimal, and it is also impossible to perform real-time evaluation and adaptive optimization of the arc extinguishing performance during the control process. Therefore, a method for optimizing the arc extinguishing performance of AC contactors is proposed.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an AC contactor arc extinguishing performance optimization method, which solves the problems raised in the above-mentioned background technology by applying a multi-dimensional control speed evaluation model, a dynamic screening mechanism of the control strategy and a performance statistical optimization method under a sliding window.

[0007] To achieve the above object, the present invention provides the following technical solution: a method for optimizing arc extinguishing performance of an AC contactor, comprising: S1: recording the trigger time of the AC contactor during trigger control over a period of time, detecting the circuit current in real time and recording the detection results, and obtaining a preliminary evaluation result of the control speed based on the trigger time and the detection results;

[0008] S2: Set the marking time, classify and mark the different control modes of the AC contactor within the marking time, and call the control speed average under the corresponding marking category. According to the control speed average under different control modes, the arc extinguishing threshold is determined and the control mode corresponding to the control speed average is retained;

[0009] S3: The retained control mode is determined to be an advanced joint control mode through joint control rules, the advanced joint control mode is added to the record library, the current control log is accessed to determine the current control mode, the preliminary evaluation result of the control speed under the current control mode is compared with the control modes in the record library, the preliminary evaluation result of the control speed under the corresponding control mode is updated, and the control mode for the next AC contactor trigger control is selected;

[0010] S4: Set a sliding window, count the speed change difference between each control mode and the same control mode in the record library, calculate the control fluctuation rate of the corresponding control mode, and sort and update each control mode in the record library based on the control power of each control mode.

[0011] In a preferred embodiment, when the control carrier detects that the trigger condition is met, it calls the system clock function to generate the current timestamp to obtain the trigger time;

[0012] By establishing a current sampling channel, collecting analog voltage signals and digitizing them, the circuit current is obtained by calculation based on the sampling signal and the static bias voltage and sensitivity of the sensor;

[0013] Compare the circuit current with the preset control current. If the circuit current is less than the control current, it means that the load circuit has entered the low current range, and the arc extinguishing operation can be performed now. If the circuit current is less than the control current, it will be retained to determine the detection result.

[0014] The trigger time and circuit current are standardized and substituted into the control speed evaluation model to make a preliminary evaluation of the control speed and determine the control speed.

[0015] In a preferred embodiment, different control modes of the AC contactor are set, including a single control method or multiple control methods, and the control mode recorded each time the control is triggered is used as the classification basis;

[0016] The classification control method is called and recorded within the set marking time. If it is called, it is marked to obtain the marked control method;

[0017] The control speed is determined by the trigger time and circuit current in the marking control mode, and all control speeds within the set marking time are counted. The control speeds are averaged to obtain the average control speeds under different control modes.

[0018] In a preferred embodiment, the average values of the control speeds under different control modes are counted, and the median of the average values of the control speeds corresponding to each control mode is taken as the arc extinguishing threshold;

[0019] The control mode corresponding to the control speed mean value that is less than or equal to the arc extinguishing threshold is retained.

[0020] In a preferred embodiment, the joint control rule is to identify whether the current control mode includes multiple control methods;

[0021] If the current control mode includes multiple control methods, it is judged as advanced joint control mode and included in the record library. If the current control mode only has one control method, it is skipped.

[0022] Obtain the preliminary evaluation results of the control speed under the current control mode, call each control mode in the record library, and compare the current control mode with the control methods in each control mode in the record library, query the control mode in the record library that is consistent with the control method in the current control mode, and update the control mode control speed.

[0023] In a preferred embodiment, the control speed corresponding to the control method in the record library that is consistent with the control method in the current control method is compared with the control speed of the current control method. If the control speed of the current control method is better than the similar method in the record library, the control speed of the similar method in the record library is overwritten. Otherwise, the original record is retained, and the maximum control speed in the record library is selected as the control method for the next AC contactor trigger control.

[0024] In a preferred embodiment, the speed change difference between each control mode and the same control mode in the record library is counted through the record library;

[0025] Extract the continuously recorded control speed data of the control mode within the set sliding window, and determine the control volatility of the control mode by calculating the average control speed and standard deviation;

[0026] The real-time voltage and current data in the AC contactor control circuit are collected and recorded in pairs in time series. The regulated electric energy of each regulation mode is obtained by performing numerical integration operation on the voltage and current data in the sliding window.

[0027] In a preferred embodiment, the control fluctuation rate of the control mode and the control power of each control mode are standardized and substituted into the beta activation model to determine the arrangement update coefficient of each control mode in the record library.

[0028] In a preferred embodiment, the beta activation model is implemented as follows: construct two core parameters of the beta distribution function and set the activation function;

[0029] Then calculate the beta activation value to obtain the permutation update coefficient of each control method in the record library.

[0030] In a preferred embodiment, the permutation update coefficients of the various control modes in the record library are sorted in descending order and substituted into the record library for updating.

[0031] Technical effects and advantages of the present invention:

[0032] 1. The present invention dynamically determines the optimal control mode by real-time monitoring and standardized processing of trigger time and current signals, combined with a control speed evaluation mechanism; realizes multi-dimensional data database construction of control modes by setting marking time and classification marking mechanism, and identifies advanced joint control modes in combination with joint control rules to improve the adaptability of control strategies; calculates control speed fluctuation rate and control power by setting a sliding window, realizes comprehensive evaluation and dynamic ranking of the stability and energy efficiency performance of control modes, thereby improving the accuracy, stability and energy efficiency level of the arc extinguishing response of the AC contactor, and has the technical advantages of intelligent control, continuous optimization and rapid control. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a method flow chart of a method for optimizing arc extinguishing performance of an AC contactor.

[0034] Figure 2 Detailed diagram of step S1 of a method for optimizing arc extinguishing performance of an AC contactor according to the present invention.

[0035] Figure 3 Detailed diagram of step S2 of a method for optimizing arc extinguishing performance of an AC contactor according to the present invention.

[0036] Figure 4 Detailed diagram of step S3 of a method for optimizing arc extinguishing performance of an AC contactor according to the present invention.

[0037] Figure 5 Detailed diagram of step S4 of a method for optimizing arc extinguishing performance of an AC contactor according to the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] See also Figure 1 , a method for optimizing the arc extinguishing performance of an AC contactor, the specific operation process is as follows:

[0041] S1: If Figure 2 As shown, the triggering time of the AC contactor trigger control is recorded over a period of time, the circuit current is detected in real time and the detection results are recorded, and a preliminary evaluation result of the control speed is obtained based on the triggering time and the detection results;

[0042] In this embodiment, the AC contactor trigger control refers to the control system applying a control voltage to the AC contactor coil to attract its internal electromagnetic system, thereby driving the main contacts to close or open, thereby forming an effective load connection or disconnection action;

[0043] Specifically, the auxiliary contacts (such as NO or NC) of the AC contactor itself are used as status detection feedback. When the contact state changes (open to closed or closed to open), it serves as the signal basis for the contactor response trigger. Combined with the control system timestamp, the triggering behavior can be accurately recorded.

[0044] The trigger time is defined as the timestamp of the moment when the control system issues the contactor trigger control command, usually recorded with millisecond accuracy. This time is used to evaluate indicators such as control response speed, action time, and arc extinguishing delay.

[0045] Specifically, the logic for obtaining the trigger time is to call the system clock function to generate the current timestamp and obtain the trigger time when the control carrier detects that the trigger condition is met;

[0046] Among them, the control carrier detects that the trigger condition is met, including but not limited to the control signal output or the auxiliary contact change, which will not be elaborated here;

[0047] Optionally, the change of auxiliary contacts can be used as an interrupt source. When the interrupt is triggered, the system automatically records the current system clock count value. Furthermore, if the contactor control is coordinated by multiple devices (such as a master control + an execution end), a communication protocol (such as CAN, Modbus, 485) must be used for synchronous point-to-point. The trigger event is recorded by the master control with a unified timestamp and broadcast.

[0048] Among them, real-time current detection refers to continuously sampling the current value flowing through the load circuit at a high frequency during the contactor's on-off operation to obtain a complete current change curve, thereby determining the load's pickup status, whether the current is lower than the set threshold, and whether there is an arc anomaly.

[0049] The logic for acquiring the circuit current is to establish a current sampling channel, collect the analog voltage signal and digitize it, and calculate the circuit current based on the sampling signal and the static bias voltage and sensitivity of the sensor;

[0050] Specifically, the calculation formula based on the sampling signal and the static bias voltage and sensitivity of the sensor is as follows:

[0051] ;

[0052] Where, is the current value corresponding to the sampling moment, At the sampling time The collected analog voltage signal, is the zero-point voltage of the Hall sensor, is the current sensitivity coefficient;

[0053] Furthermore, a total number of sampling moments T is set, where t is the t-th sampling moment;

[0054] Optional, the static zero point voltage and current sensitivity coefficient of the current sensor are obtained by the experimenter based on the specific model parameter manual and measured calibration data, for example, the Hall current sensor (such as ACS758), etc., and will not be described here;

[0055] Compare the circuit current with the preset control current. If the circuit current is greater than or equal to the control current, it means that the main circuit is still in the on state and the load current has not dropped. In this case, the waiting state is maintained and the arc extinguishing control is not performed temporarily. If the circuit current is less than the control current, it means that the load circuit has entered the low current range and the arc extinguishing operation can be performed at this time. If the circuit current is less than the control current, it is retained and the detection result is determined.

[0056] Wherein, the detection result includes a circuit current that is less than a control current;

[0057] The trigger time and circuit current are standardized and substituted into the control speed evaluation model to make a preliminary evaluation of the control speed and determine the control speed;

[0058] Among them, the preliminary evaluation is a period of time that the experimenters preferentially select as the analysis time for the preliminary evaluation of the AC contactor trigger control. The specific analysis time length is not limited and will not be elaborated here.

[0059] It should be noted that the standardization methods include but are not limited to standard linear transformation based on interval scaling, Z-Score standardization method based on statistics, or normalization method based on nonlinear mapping function. The application methods of standardization are not described in detail here.

[0060] The control speed evaluation model is a computational model used to map and analyze standardized input parameters (such as AC contactor trigger time and current variation characteristics) to evaluate the control response speed under a specific control mode. This model is constructed based on single and multivariable regression and generally considers the control speed as a weighted linear combination of various influencing factors (i.e., the normalized results of trigger time and circuit current).

[0061] S2: If Figure 3As shown, a marking time is set, different control modes of the AC contactor within the marking time are classified and marked, and the average control speed under the corresponding marking category is called. The arc extinguishing threshold is formulated according to the average control speed under different control modes, and the control mode corresponding to the average control speed is retained;

[0062] Set the marking time, which is a continuous collection period and is used to summarize the AC contactor control behaviors triggered during this time period;

[0063] The specific marking time can be set based on the experimenter's experience, debugging, and data statistical analysis. For example, under conditions of intensive control or large load fluctuations, the marking time can be set to 3600 seconds (i.e., 1 hour) to obtain sufficient samples. Under conditions of light load or timed operation, the marking time can also be set to 120 minutes or other periods. The marking time window is not a limiting condition of the present invention and is not detailed here.

[0064] Set different control modes for AC contactors, including single control method or multiple control methods, and use the control method recorded each time the control is triggered as the classification basis;

[0065] Specifically, the control methods include voltage regulation, current limiting, and tripping slow-release types as classification basis. Among them, the voltage regulation type refers to controlling the on-off rhythm of the contactor main circuit voltage to quickly reduce the arc voltage or circuit voltage in the arc extinguishing stage, thereby reducing the current rise rate and promoting the natural extinction of the arc. This method relies on a controllable power supply or a series voltage regulation module to achieve dynamic output voltage downward control. It is suitable for medium inductive or resistive load scenarios where short-term voltage fluctuations are allowed;

[0066] The current limiting type limits the current rise rate and amplitude in the circuit by connecting a series current limiting element (such as a fast-response reactor or semiconductor current limiting module) after the AC contactor is closed, thereby suppressing the release of high arc energy and achieving the purpose of auxiliary arc extinguishing. It is widely used in high-current inductive loads, such as motor starting and reactor switching scenarios.

[0067] The tripping slow-release type means that when the contactor main contacts are detected in a high arc risk zone, a tripping command is quickly triggered. At the same time, a short-delay slow-release logic (such as a pre-release mechanism) is used to disconnect the control device in advance at the beginning of the current decline, reducing the arc extinguishing pressure. It is suitable for precision control carriers that are triggered at high frequencies but cannot tolerate long arcs.

[0068] It should be noted that the control method is not limited to the voltage regulation type, current limiting type, and tripping slow release type mentioned above, but also includes the following control strategy types: pulse intermittent type, voltage drop feedback type, and phase delay type, etc., which will not be detailed here;

[0069] The classification control method is called and recorded within the set marking time. If it is called, it is marked to obtain the marked control method;

[0070] Among them, calling means that during the marked time, the AC contactor references and actually applies the control parameters and execution logic corresponding to the control mode during the control execution process, that is, real control behavior occurs and produces actual intervention effects on the current or voltage waveform. For example, the control system activates the "current limiting type" strategy for a certain contactor closing action and executes the current limiting response curve, adopts the "tripping slow release type" delayed release logic in the contactor tripping control, or activates the voltage fast regulation module corresponding to the "voltage regulation type";

[0071] The control speed is determined by the trigger time and circuit current of the marking control mode, and all control speeds within the set marking time are counted. The control speeds are averaged to obtain the average control speed under different control modes;

[0072] It should be noted that the control speed is obtained by calculating the trigger time and the circuit current, which has been described in the above embodiments and will not be elaborated here.

[0073] The average control speed under different control modes is counted, and the median of the control speed average corresponding to each control mode is taken as the arc extinguishing threshold;

[0074] Keep the control mode corresponding to the control speed mean value that is less than or equal to the arc extinguishing threshold;

[0075] It should be noted that the arc extinguishing threshold is not preset by those skilled in the art, but is set according to different control methods after the AC contactor is triggered and controlled in different rounds, and will not be described in detail here;

[0076] S3: If Figure 4 As shown, access the current control log, determine the filter control mode and judge whether it belongs to the advanced joint control mode through the joint control rules, add the advanced joint control mode to the record library, record the preliminary evaluation result of the control speed under the current control mode and compare it with the control modes in the record library, update the preliminary evaluation result of the control speed under the corresponding control mode and select the control mode for the next AC contactor trigger control;

[0077] Access the control log records corresponding to the AC contactor control event. The specific control log includes: the trigger timestamp of the current control cycle, the remaining control mode, the actual current sampling curve and the evaluation current value, and the preliminary evaluation results of the control speed;

[0078] Among them, the joint control rule refers to identifying whether the current control mode contains multiple control methods based on the control strategy combination, trigger conditions, historical behavior and system configuration status within the AC contactor control cycle;

[0079] If the current control mode includes multiple control methods, it is judged as advanced joint control mode and included in the record library. If the current control mode only has one control method, it is skipped.

[0080] It should be noted that the control method has been described in the above embodiments and will not be repeated here;

[0081] Obtain the preliminary evaluation results of the control speed under the current control mode, call each control mode in the record library, and compare the current control mode with the control methods in each control mode in the record library, query the control mode in the record library that is consistent with the control method in the current control mode, and update the control mode control speed;

[0082] Compare the control speed corresponding to the control method in the record library that is consistent with the control method in the current control method with the control speed of the current control method. If the control speed of the current control method is better than the control speed of the same method in the record library, then overwrite the control speed of the same method in the record library. Otherwise, retain the original record and select the maximum control speed in the record library as the control method for the next AC contactor trigger control;

[0083] For example, if the current control mode has a control speed of 0.345 and the control mode in the record library that is consistent with the control mode in the current control mode has a control speed of 0.343, the current control mode will overwrite the control mode in the record library that is consistent with the control mode in the current control mode, and the current control mode control speed will be used as the control mode for the next AC contactor trigger control.

[0084] S4: As Figure 5 As shown, a sliding window is set to count the speed change difference between each control mode and the same control mode in the record library and calculate the control fluctuation rate of the corresponding control mode. Combined with the control power of each control mode, each control mode is sorted and updated in the record library;

[0085] A sliding window is a fixed range that moves forward on a timeline or sample sequence. It is used to extract the latest limited data from a continuous data stream or historical record sequence for real-time statistics and analysis.

[0086] The speed change difference between each control mode and the same control mode in the record library is counted through the record library;

[0087] The control volatility of a control method refers to the statistical analysis of the control speed change difference of the current control method within the set sliding window range, which is used to measure the performance stability of the control method over multiple control cycles. Its acquisition logic is to extract the continuously recorded control speed data of the control method within the set sliding window, and determine the control volatility of the control method by calculating the average control speed and standard deviation;

[0088] Specifically, the calculation of the regulatory volatility is based on the coefficient of variation formula, which is expressed as follows:

[0089] ;

[0090] Where, is the control volatility of the control method, is the standard deviation of the control speed within the sliding window, is the average control speed of the control mode within the sliding window;

[0091] The controlled electric energy of each control mode is the total amount of electric energy consumed or transmitted under a specific control mode within a sliding window. It is used to reflect the energy consumption performance and efficiency characteristics of the control mode during actual operation. Its acquisition logic is to collect real-time voltage and current data in the AC contactor control circuit and record them in a time series. The controlled electric energy of each control mode is obtained by numerically integrating the voltage and current data within the sliding window.

[0092] Specifically, the discrete integral calculation formula is expressed as follows:

[0093] ;

[0094] Where, For each control method of the control power, The first The voltage value at each sampling moment, The first The current value at each sampling moment, is the sampling interval in the sliding window, is the total number of valid sampling points in the sliding window, where For the Sampling time in the sliding window;

[0095] It should be noted that the duration of the sliding window was determined by our researchers based on analysis of system response characteristics and dynamic data statistics under typical operating conditions, aiming to balance data coverage and real-time requirements. Furthermore, the sampling interval within the sliding window was also selected by our researchers through sampling accuracy assessment and hardware data processing capability matching analysis to ensure the integrity and accuracy requirements of the control speed and power characteristic data. This will not be elaborated here;

[0096] The control volatility of the control mode and the control power of each control mode are standardized and substituted into the beta activation model to determine the permutation update coefficient of each control mode in the record library;

[0097] The Beta activation model constructs an activation function based on the Beta distribution probability weight model, simulating the probabilistic activation path of control behavior. It has the capabilities of "threshold adjustment + nonlinear normalization", "trust accumulation" of the historical performance of the control method, and supports the strategy activation mechanism for the selection of the control method. It is very suitable for complex joint control and multi-strategy optimization.

[0098] The steps to implement the Beta activation model are as follows:

[0099] Construct the two core parameters of the Beta distribution function, set the activation function: control volatility (lower value is better) corresponding to the use of parameters , control energy efficiency (higher value is better) corresponding to the use of parameters ;

[0100] The two mapping parameters that define each control method are as follows:

[0101] , ;

[0102] in, and is the weight amplification parameter, which can be adjusted to control the preference tendency of the beta activation model;

[0103] Calculate the beta activation value:

[0104] ;

[0105] in, is the update coefficient of the arrangement of each control method in the record library. The larger the update coefficient of the arrangement of each control method in the record library, the higher the priority.

[0106] Sort the update coefficients of each control method in the record library from large to small, and substitute them into the record library for update;

[0107] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by technicians in this field according to actual conditions.

[0108] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via wired or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0109] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0110] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0111] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0112] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways;

[0113] For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components may be combined or integrated into another system, or some features may be ignored or not performed.

[0114] On the other hand, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, which may be electrical, mechanical or other forms.

[0115] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0116] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0117] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0118] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for optimizing arc extinguishing performance of an AC contactor, characterized by: include: S1: Record the triggering time of the AC contactor during triggering control over a period of time, detect the circuit current in real time and record the detection results, and obtain a preliminary evaluation result of the control speed based on the triggering time and detection results; S2: Set the marking time, classify and mark the different control modes of the AC contactor within the marking time, and call the control speed average under the corresponding marking category. According to the control speed average under different control modes, the arc extinguishing threshold is determined and the control mode corresponding to the control speed average is retained; S3: Access the current control log, determine the filter control mode, and use the joint control rules to determine whether it belongs to the advanced joint control mode. The advanced joint control mode is included in the record library. The preliminary evaluation result of the control speed under the current control mode is recorded and compared with each control mode in the record library. The preliminary evaluation result of the control speed under the corresponding control mode is updated and the control mode is selected for the next AC contactor trigger control. The joint control rule is to identify whether the current control method contains multiple control methods; If the current control mode includes multiple control methods, it is judged as advanced joint control mode and included in the record library. If the current control mode only has one control method, it is skipped. Obtain the preliminary evaluation results of the control speed under the current control mode, call each control mode in the record library, and compare the current control mode with the control methods in each control mode in the record library, query the control mode in the record library that is consistent with the control method in the current control mode, and update the control mode control speed; S4: Set a sliding window, count the speed change difference between each control mode and the same control mode in the record library, calculate the control fluctuation rate of the corresponding control mode, and sort and update each control mode in the record library based on the control power of each control mode.

2. The method for optimizing arc extinguishing performance of an AC contactor according to claim 1, characterized in that: When the control carrier detects that the trigger condition is met, it calls the system clock function to generate the current timestamp and obtain the trigger time; By establishing a current sampling channel, collecting analog voltage signals and digitizing them, the circuit current is obtained by calculation based on the sampling signal and the static bias voltage and sensitivity of the sensor; Compare the circuit current with the preset control current. If the circuit current is less than the control current, it means that the load circuit has entered the low current range, and the arc extinguishing operation can be performed now. If the circuit current is less than the control current, it will be retained to determine the detection result. The trigger time and circuit current are standardized and substituted into the control speed evaluation model to make a preliminary evaluation of the control speed and determine the control speed.

3. The method for optimizing arc extinguishing performance of an AC contactor according to claim 1, characterized in that: Set different control modes for AC contactors, including single control method or multiple control methods, and use the control method recorded each time the control is triggered as the classification basis; The classification control method is called and recorded within the set marking time. If it is called, it is marked to obtain the marked control method; The control speed is determined by the trigger time and circuit current in the marking control mode, and all control speeds within the set marking time are counted. The control speed is averaged to obtain the average control speed under different control modes.

4. The method for optimizing arc extinguishing performance of an AC contactor according to claim 3, characterized in that: The average control speed under different control modes is counted, and the median of the control speed average corresponding to each control mode is taken as the arc extinguishing threshold; The control mode corresponding to the control speed mean value that is less than or equal to the arc extinguishing threshold is retained.

5. The method for optimizing arc extinguishing performance of an AC contactor according to claim 1, characterized in that: The control speed corresponding to the control method in the record library that is consistent with the control method in the current control method is compared with the control speed of the current control method. If the control speed of the current control method is better than the similar method in the record library, the control speed of the similar method in the record library is overwritten. Otherwise, the original record is retained, and the maximum control speed in the record library is selected as the control method for the next AC contactor trigger control.

6. The method for optimizing arc extinguishing performance of an AC contactor according to claim 5, characterized in that: The speed change difference between each control mode and the same control mode in the record library is counted through the record library; Extract the continuously recorded control speed data of the control mode within the set sliding window, and determine the control volatility of the control mode by calculating the average control speed and standard deviation; The real-time voltage and current data in the AC contactor control circuit are collected and recorded in pairs in time series. The regulated electric energy of each regulation mode is obtained by performing numerical integration operation on the voltage and current data in the sliding window.

7. The method for optimizing arc extinguishing performance of an AC contactor according to claim 6, characterized in that: The control fluctuation rate of the control mode and the control power of each control mode are standardized and substituted into the beta activation model to determine the arrangement update coefficient of each control mode in the record library.

8. The method for optimizing arc extinguishing performance of an AC contactor according to claim 7, characterized in that: The steps to implement the Beta activation model are as follows: construct the two core parameters of the Beta distribution function and set the activation function; Then calculate the beta activation value to obtain the permutation update coefficient of each control method in the record library.

9. The method for optimizing arc extinguishing performance of an AC contactor according to claim 8, characterized in that: The update coefficients of the arrangement of each control method in the record library are sorted from large to small, and substituted into the record library for update.

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