A method and system for suppressing commutation distortion of a swiss rectifier based on duty cycle temporary compensation

Abstract

The application provides a SWISS rectifier commutation distortion suppression method and system based on a duty ratio temporary compensation, comprising the following steps: collecting real-time multi-source parameters of a SWISS rectifier, synchronously preprocessing the real-time multi-source parameters to obtain a plurality of circuit operation parameters of the SWISS rectifier, restoring voltage and current characteristics and commutation distortion presentation information of each commutation moment, screening target commutation moments presenting distortion conditions, analyzing commutation current leakage rules and voltage distortion characteristics, determining a compensation duty ratio corresponding to the target commutation moment, temporarily compensating the target commutation moment, and monitoring whether the temporary compensation effect meets an expected target; if not, the target commutation moment is compensated in a cycle, so that the SWISS rectifier commutation distortion can be effectively suppressed.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a method and system for suppressing commutation distortion in SWISS rectifiers based on temporary duty cycle compensation. Background Technology

[0002] With the escalating global environmental pollution and energy crisis, hydrogen production technology is being applied more and more widely. The hydrogen production process requires direct current (DC), therefore, hydrogen production power supplies typically need to include AC-to-DC converters to rectify the AC power into DC. The SWISS rectifier topology, as a step-down single-stage rectifier topology, offers significant efficiency advantages compared to traditional two-stage rectifier topologies. It can simultaneously achieve input-side power factor correction and output-side current and power control at the single-stage circuit level, perfectly matching the application requirements of hydrogen production power supplies and becoming a promising topology for hydrogen production power supplies.

[0003] At the control level, the harmonic injection circuit of the SWISS rectifier topology is decoupled from the downstream DC-DC converter circuit or DC-DC converter. The harmonic injection circuit switches on only when the phase voltage is at its intermediate value to provide a current path for the intermediate voltage phase, and switches on and off twice per power frequency cycle. The downstream DC-DC converter circuit or DC-DC converter, on the other hand, switches on and off at high frequency to achieve the circuit's voltage reduction function. However, due to the decoupling of the control and the fact that the harmonic injection circuit operates at twice the power frequency, the basic SWISS topology suffers from current leakage due to the overlap of high-frequency voltage ripple on the input side. This causes distortion of the input voltage and current during commutation. This distortion is one of the main reasons affecting the power quality on the input side of the SWISS rectifier circuit.

[0004] To address the commutation distortion problem, existing technologies have proposed a method of temporarily modulating the harmonic injection circuit switch at a high frequency to compensate for leakage current at the commutation point and suppress commutation distortion. While this method has achieved some success, it also has significant drawbacks. Adopting this control strategy necessitates consideration of the high-frequency performance of the harmonic injection circuit switch in practical applications, thus imposing hardware limitations. Furthermore, the increased number of high-frequency devices increases the complexity of power supply design, hindering the widespread adoption of the topology.

[0005] Therefore, the present invention provides a method and system for suppressing commutation distortion in SWISS rectifiers based on temporary duty cycle compensation. Summary of the Invention

[0006] This invention provides a method and system for suppressing commutation distortion in SWISS rectifiers based on temporary duty cycle compensation. This method and system can effectively suppress commutation distortion in SWISS rectifiers without relying on high-frequency modulation harmonic injection circuit switches, and does not increase hardware design limitations.

[0007] This invention provides a method for suppressing commutation distortion in SWISS rectifiers based on temporary duty cycle compensation, comprising:

[0008] Step 1: Collect real-time multi-source parameters of the SWISS rectifier, and perform synchronous preprocessing on the real-time multi-source parameters to obtain several circuit operation parameters of the SWISS rectifier;

[0009] Step 2: Based on the circuit operating parameters, reconstruct the voltage and current characteristics of the SWISS rectifier at each commutation moment, and analyze the commutation distortion information at each commutation moment;

[0010] Step 3: Screen the target commutation time that shows distortion, analyze the commutation current leakage law and voltage distortion characteristics of the target commutation time, and determine the compensation duty cycle corresponding to the target commutation time;

[0011] Step 4: Perform temporary compensation on the target commutation time according to the compensation duty cycle, and monitor whether the effect of temporary compensation meets the expected target. If not, perform cyclic compensation on the target commutation time.

[0012] In one feasible embodiment, step 1 includes:

[0013] Step 11: Collect the real-time input side voltage, real-time DC side current, real-time output side voltage and switching cycle parameters of the SWISS rectifier and sort them in time sequence to obtain the real-time multi-source parameters of the SWISS rectifier. Determine the real-time initial parameter value corresponding to each parameter source in the real-time multi-source parameters.

[0014] Step 12: Obtain the historical parameter patterns of the SWISS rectifier, and determine whether each real-time initial parameter value is consistent with the historical parameter patterns. If they are inconsistent, determine the parameter dimension and parameter value range corresponding to each parameter source based on the historical parameter patterns.

[0015] Step 13: Standardize the real-time multi-source data according to the parameter dimensions and the parameter value range to obtain the real-time processing parameter value corresponding to each parameter source. Iteratively select several real-time processing parameter values ​​as a verification parameter set, and perform cross-validation on each unselected real-time processing parameter value in a loop.

[0016] Step 14: Determine the parameter accuracy corresponding to each real-time processing parameter value based on the cross-validation results. When the parameter accuracy is abnormal, filter the corresponding interference information from the processed real-time multi-source data and synchronously adjust the real-time processing parameter value to obtain several circuit operating parameters of the SWISS rectifier.

[0017] In one feasible embodiment, step 2 includes:

[0018] Step 21: Based on the topological characteristics of the SWISS rectifier and the circuit operating parameters, reconstruct the operating signal of the SWISS rectifier, and use the operating signal to deduce the voltage amplitude, current change trend and phase change relationship of the SWISS rectifier at each commutation moment;

[0019] Step 22: Construct a multi-dimensional commutation distortion judgment rule based on the commutation distortion principle of the SWISS rectifier, and use the multi-dimensional commutation distortion judgment rule to compare the distortion of the voltage amplitude, current change trend and phase change relationship corresponding to each commutation moment;

[0020] Step 23: Based on the distortion comparison results corresponding to each commutation moment, adjust the voltage and current of the corresponding signal moment in the operating signal to obtain the commutation operating signal of the SWISS rectifier, and obtain the current and voltage characteristics corresponding to each commutation moment in the commutation operating signal.

[0021] Step 24: Determine the commutation voltage information, commutation current information, and commutation phase change information corresponding to each commutation moment based on the voltage adjustment process and the current adjustment process, and determine the commutation distortion presentation information corresponding to each commutation moment in combination with the corresponding current and voltage characteristics.

[0022] In one feasible embodiment, step 3 includes:

[0023] Step 31: Filter the target commutation time and the corresponding target commutation presentation information that meet the distortion conditions, use the target commutation presentation information to determine the distortion type, distortion time and distortion degree corresponding to each target commutation time, and generate the distortion visual information corresponding to each target commutation time;

[0024] Step 32: Based on the circuit operating parameters, reconstruct the commutation current leakage path corresponding to each target commutation moment, and combine the commutation current change trend corresponding to each target commutation moment to determine the logical relationship between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier and mark it in the corresponding distortion visual information.

[0025] Step 33: Analyze the commutation current leakage law and voltage distortion characteristics of the SWISS rectifier at each target commutation moment based on the annotated distortion visual information, and analyze the influence parameters of the voltage distortion characteristics on the duty cycle of the SWISS rectifier based on the commutation current leakage law.

[0026] Step 34: Using the effective duty cycle influence parameter that is higher than the specified influence parameter threshold, and combining it with the corresponding commutation current leakage law and voltage distortion characteristics, construct the compensation duty cycle model of the SWISS rectifier. Run the compensation duty cycle model to determine the compensation duty cycle corresponding to each target commutation moment and display it.

[0027] One feasible approach also includes:

[0028] The target commutation time and non-target commutation time of the SWISS rectifier at the current moment are statistically analyzed. A corresponding compensation duty cycle is added to each target commutation time, and a basic duty cycle is added to each non-target commutation time.

[0029] Calculate the total compensation duty cycle of the SWISS rectifier;

[0030] Calculate the sum of the basic duty cycles of the SWISS rectifier;

[0031] When the sum of the compensated duty cycles is higher than the sum of the base duty cycles, the range to be corrected for the base duty cycle is determined based on the numerical difference between the sum of the compensated duty cycles and the sum of the base duty cycles.

[0032] The base duty cycle is corrected within the range to be corrected until the sum of the compensated duty cycles is not higher than the sum of the base duty cycles.

[0033] In one feasible embodiment, step 4 includes:

[0034] Step 41: Identify the distortion trigger time and distortion trigger duration corresponding to each target commutation time, and generate a duty cycle compensation signal for each target commutation time by combining the corresponding compensation duty cycle.

[0035] Step 42: Use the duty cycle compensation signal to input to the control terminal of the high-frequency switching transistor on the back side of the SWISS rectifier to temporarily compensate the voltage and current characteristics at the target commutation moment. During the compensation process, the phase compensation process corresponding to the target commutation moment is collected.

[0036] Step 43: Based on the phase compensation process, derive the operating parameters of the compensation circuit of the SWISS rectifier, determine whether the temporary compensation effect meets the expected target, and if not, adjust the compensation duty cycle corresponding to each target commutation moment to perform cyclic compensation for the target commutation moment.

[0037] One feasible approach also includes:

[0038] The pre-compensation presentation features and post-compensation presentation features corresponding to each target commutation moment are obtained respectively, resulting in several simultaneous feature differences;

[0039] The operating rules of the SWISS rectifier are constructed based on the real-time multi-source parameters.

[0040] Filter the simultaneous feature difference of targets that conform to the above operating rules, and the target compensation duty cycle corresponding to the simultaneous feature difference of targets;

[0041] The target compensation duty cycle is regarded as the basic duty cycle of the SWISS rectifier and fed back into the SWISS rectifier.

[0042] This invention provides a SWISS rectifier commutation distortion suppression system based on duty cycle temporary compensation, comprising:

[0043] The parameter acquisition module is used to collect real-time multi-source parameters of the SWISS rectifier, and to perform synchronous preprocessing on the real-time multi-source parameters to obtain several circuit operation parameters of the SWISS rectifier.

[0044] The distortion identification module is used to reconstruct the voltage and current characteristics of the SWISS rectifier at each commutation moment based on the circuit operating parameters, and to analyze the commutation distortion presentation information at each commutation moment.

[0045] The distortion analysis module is used to screen target commutation moments that exhibit distortion, analyze the commutation current leakage pattern and voltage distortion characteristics of the target commutation moments, and determine the compensation duty cycle corresponding to the target commutation moments.

[0046] The compensation execution module is used to temporarily compensate the target commutation time according to the compensation duty cycle, and monitor whether the temporary compensation effect meets the expected target. If it does not meet the target, the module performs cyclic compensation on the target commutation time.

[0047] In one implementable manner, the distortion analysis module includes:

[0048] A visual presentation unit is used to filter target commutation times that conform to the distortion conditions and corresponding target commutation presentation information, use the target commutation presentation information to determine the distortion type, distortion time and distortion degree corresponding to each target commutation time, and generate distortion visual information corresponding to each target commutation time.

[0049] The pattern analysis unit is used to reconstruct the commutation current leakage path corresponding to each target commutation moment according to the circuit operating parameters, and determine the logical relationship between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier by combining the commutation current change trend corresponding to each target commutation moment and mark it in the corresponding distortion visual information.

[0050] The parameter conversion unit is used to analyze the commutation current leakage law and voltage distortion characteristics of each target commutation moment of the SWISS rectifier based on the annotated distortion visual information, and to analyze the influence parameters of the voltage distortion characteristics on the duty cycle of the SWISS rectifier based on the commutation current leakage law.

[0051] The modeling and analysis unit is used to construct the compensation duty cycle model of the SWISS rectifier by using the effective duty cycle influence parameter that is higher than the specified influence parameter threshold, combined with the corresponding commutation current leakage law and voltage distortion characteristics. The compensation duty cycle model is run to determine and display the compensation duty cycle corresponding to each target commutation moment.

[0052] The beneficial effects of the above technical solution are as follows: To effectively improve the power quality on the input side of the rectifier, firstly, by collecting real-time multi-source parameters and performing synchronous preprocessing, the basic data of rectifier operation are comprehensively obtained. Simultaneously, through standardization, cross-validation, and other processing methods, interference information is eliminated and abnormal parameters are corrected to ensure the accuracy and reliability of the output circuit operating parameters. Then, based on the reliable circuit operating parameters, the voltage and current characteristics at the commutation moment are reconstructed. Combined with the principle of commutation distortion, the distortion presentation information at each commutation moment is accurately analyzed, achieving comprehensive identification and quantitative description of commutation distortion. Furthermore, the target commutation moments with distortion are further screened out. By deeply analyzing the leakage law of commutation current and the characteristics of voltage distortion, a targeted compensation duty cycle calculation logic is constructed to ensure that the determined compensation duty cycle is accurately matched with the degree of distortion, avoiding overcompensation or undercompensation caused by blind compensation. This provides a foundation for efficient suppression of commutation distortion. Finally, temporary compensation is performed according to the compensation duty cycle, and the compensation strategy is continuously adjusted through effect monitoring and cyclic optimization mechanisms to ensure that the commutation distortion suppression effect is stable and meets expectations. This effectively solves the problem of poor effect that may occur with single compensation. At the same time, the entire compensation process does not interfere with the original control loop, ensuring the stable operation of the rectifier and significantly improving the power quality on the input side.

[0053] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0054] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0055] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0056] Figure 1 This is a schematic diagram illustrating the workflow of a SWISS rectifier commutation distortion suppression method based on duty cycle temporary compensation in an embodiment of the present invention.

[0057] Figure 2 This is a schematic diagram of the composition of a SWISS rectifier commutation distortion suppression system based on temporary duty cycle compensation in an embodiment of the present invention. Detailed Implementation

[0058] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0059] Example 1: This example provides a method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation, such as... Figure 1 As shown, it includes:

[0060] Step 1: Collect real-time multi-source parameters of the SWISS rectifier, and perform synchronous preprocessing on the real-time multi-source parameters to obtain several circuit operation parameters of the SWISS rectifier;

[0061] Step 2: Based on the circuit operating parameters, reconstruct the voltage and current characteristics of the SWISS rectifier at each commutation moment, and analyze the commutation distortion information at each commutation moment;

[0062] Step 3: Screen the target commutation time that shows distortion, analyze the commutation current leakage law and voltage distortion characteristics of the target commutation time, and determine the compensation duty cycle corresponding to the target commutation time;

[0063] Step 4: Perform temporary compensation on the target commutation time according to the compensation duty cycle, and monitor whether the effect of temporary compensation meets the expected target. If not, perform cyclic compensation on the target commutation time.

[0064] In this example, the SWISS rectifier represents a buck single-stage rectifier topology used in scenarios requiring AC / DC conversion, such as hydrogen production power supplies, which can achieve input-side power factor correction and output-side current and power control at the first-stage circuit level.

[0065] In this example, the real-time multi-source parameters represent various parameters related to the operation of the SWISS rectifier that are acquired in real time, including input voltage, DC current, output voltage, switching cycle-related parameters, etc.

[0066] In this example, synchronous preprocessing refers to a series of unified processes, such as temporal sorting, standardization, cross-validation, interference information filtering, and parameter adjustment, on the collected real-time multi-source parameters. The purpose is to improve the consistency and reliability of the parameters.

[0067] In this example, the circuit operating parameters represent reliable parameters obtained after synchronous preprocessing that accurately reflect the operating status of the SWISS rectifier and serve as the basis for subsequent distortion identification and compensation calculations.

[0068] In this example, voltage and current characteristics represent the core attributes that reflect the voltage and current operating states, such as the voltage amplitude, current change trend, and phase change relationship at the commutation moment.

[0069] In this example, the commutation moment refers to the specific moment when the current switches between different phases during the operation of the SWISS rectifier;

[0070] In this example, the commutation distortion information indicates various information related to commutation distortion, such as whether distortion exists at the commutation time, the type of distortion, the degree of distortion, and the start and duration of the distortion.

[0071] In this example, the commutation current leakage law represents the changes in the occurrence path, intensity trend, and influencing factors of the current leakage phenomenon at the commutation moment;

[0072] In this example, voltage distortion characteristics represent the core manifestations of voltage distortion at the commutation moment, including voltage clamping characteristics, voltage step amplitude, and voltage ripple distribution.

[0073] In this example, the compensation duty cycle is a specific value calculated for the target commutation moment to temporarily adjust the duty cycle of the high-frequency switch tube on the back side in order to suppress commutation distortion.

[0074] In this example, the expected target refers to the preset standard for commutation distortion suppression effect used to determine whether the compensation effect meets the standard. It usually includes the qualified range of quantitative indicators such as voltage distortion rate and current distortion rate.

[0075] The working principle and beneficial effects of the above technical solution are as follows: To effectively improve the power quality on the input side of the rectifier, firstly, real-time multi-source parameters are collected and synchronously preprocessed to comprehensively acquire the basic data of rectifier operation. Simultaneously, interference information is eliminated and abnormal parameters are corrected through standardization and cross-validation to ensure the accuracy and reliability of the output circuit operating parameters. Then, based on the reliable circuit operating parameters, the voltage and current characteristics at the commutation moment are reconstructed. Combined with the principle of commutation distortion, the distortion presentation information at each commutation moment is accurately analyzed, achieving comprehensive identification and quantitative description of commutation distortion. Furthermore, target commutation moments with distortion are further screened out. By deeply analyzing the leakage law of commutation current and the characteristics of voltage distortion, a targeted compensation duty cycle calculation logic is constructed to ensure that the determined compensation duty cycle is accurately matched with the degree of distortion, avoiding overcompensation or undercompensation caused by blind compensation. This provides a foundation for efficient suppression of commutation distortion. Finally, temporary compensation is performed according to the compensation duty cycle, and the compensation strategy is continuously adjusted through effect monitoring and cyclic optimization mechanisms to ensure that the commutation distortion suppression effect is stable and meets expectations. This effectively solves the problem of poor effect that may occur with single compensation. At the same time, the entire compensation process does not interfere with the original control loop, ensuring the stable operation of the rectifier and significantly improving the power quality on the input side.

[0076] Example 2: Based on Example 1, the method for suppressing commutation distortion of a SWISS rectifier based on temporary duty cycle compensation, step 1 includes:

[0077] Step 11: Collect the real-time input side voltage, real-time DC side current, real-time output side voltage and switching cycle parameters of the SWISS rectifier and sort them in time sequence to obtain the real-time multi-source parameters of the SWISS rectifier. Determine the real-time initial parameter value corresponding to each parameter source in the real-time multi-source parameters.

[0078] Step 12: Obtain the historical parameter patterns of the SWISS rectifier, and determine whether each real-time initial parameter value is consistent with the historical parameter patterns. If they are inconsistent, determine the parameter dimension and parameter value range corresponding to each parameter source based on the historical parameter patterns.

[0079] Step 13: Standardize the real-time multi-source data according to the parameter dimensions and the parameter value range to obtain the real-time processing parameter value corresponding to each parameter source. Iteratively select several real-time processing parameter values ​​as a verification parameter set, and perform cross-validation on each unselected real-time processing parameter value in a loop.

[0080] Step 14: Determine the parameter accuracy corresponding to each real-time processing parameter value based on the cross-validation results. When the parameter accuracy is abnormal, filter the corresponding interference information from the processed real-time multi-source data and synchronously adjust the real-time processing parameter value to obtain several circuit operating parameters of the SWISS rectifier.

[0081] In this example, the real-time input side voltage represents the voltage signal at the AC input port of the SWISS rectifier, which reflects the power input status and is collected in real time.

[0082] In this example, the real-time DC side current represents the current signal at the DC output port of the SWISS rectifier, which reflects the power output status and is collected in real time.

[0083] In this example, the real-time output side voltage represents the voltage signal that reflects the power output status, which is collected in real time at the DC output port of the SWISS rectifier.

[0084] In this example, the switching cycle parameter represents the time-related parameter corresponding to the completion of one turn-on and turn-off action of the switching transistor in the SWISS rectifier;

[0085] In this example, the real-time initial parameter values ​​represent the raw, unprocessed real-time parameter data collected from each parameter source.

[0086] In this example, the historical parameter patterns represent the stable change patterns and distribution characteristics of each parameter during the normal operation of the SWISS rectifier in the past.

[0087] In this example, the parameter dimension represents the category identifier used to describe the physical properties of the corresponding parameter, and is used to distinguish parameters with different physical meanings;

[0088] In this example, the parameter value range represents the reasonable range of values ​​for the corresponding parameter under normal operating conditions, determined based on historical parameter patterns.

[0089] In this example, standardization refers to the process of converting parameters with different dimensions and numerical ranges into comparable standardized values ​​according to a unified rule.

[0090] In this example, the real-time processing parameter value represents the real-time parameter data with a unified standard format obtained after standardization processing;

[0091] In this example, cross-validation refers to the process of iteratively selecting some real-time processing parameter values ​​as the validation benchmark and verifying the consistency and accuracy of the remaining parameters.

[0092] In this example, the verification parameter set represents a set of real-time processing parameter values ​​randomly selected during the iteration process to verify other parameters;

[0093] In this example, interference information refers to irrelevant data or interference signals mixed in with real-time multi-source data, causing abnormal parameter accuracy and inconsistent with the actual operating state of the rectifier.

[0094] The working principle and beneficial effects of the above technical solution are as follows: To provide a high-quality data foundation for the entire commutation distortion suppression process and ensure the accuracy and reliability of subsequent steps, key operating parameters such as the input voltage and DC current of the SWISS rectifier are first comprehensively collected. Multi-source parameters are synchronized through time-series sequencing, and the real-time initial parameter values ​​of each parameter source are clearly defined, fully capturing the real-time operating status of the rectifier. Then, using historical parameter patterns as a verification benchmark, abnormal parameters are quickly identified by comparing the real-time initial parameter values ​​with historical patterns, determining the parameter dimensions and numerical ranges, providing a clear basis for subsequent standardization processing. Further standardization processing is performed based on the parameter dimensions and numerical ranges to eliminate the influence of dimensional differences and numerical spans between different parameters. Iterative cross-validation is performed by randomly selecting a set of verification parameters, repeatedly verifying the consistency and accuracy of unselected parameters, effectively filtering random errors and improving parameter reliability. Finally, based on the cross-validation results, parameter accuracy is quantified, parameters with abnormal accuracy are accurately located, interference information is filtered to find the root cause of the anomaly, and parameters are synchronously adjusted, achieving precise correction of abnormal parameters. Ultimately, the required circuit operating parameters are output, ensuring data quality.

[0095] Example 3: Based on Example 1, the method for suppressing commutation distortion of a SWISS rectifier based on temporary duty cycle compensation, step 2 includes:

[0096] Step 21: Based on the topological characteristics of the SWISS rectifier and the circuit operating parameters, reconstruct the operating signal of the SWISS rectifier, and use the operating signal to deduce the voltage amplitude, current change trend and phase change relationship of the SWISS rectifier at each commutation moment;

[0097] Step 22: Construct a multi-dimensional commutation distortion judgment rule based on the commutation distortion principle of the SWISS rectifier, and use the multi-dimensional commutation distortion judgment rule to compare the distortion of the voltage amplitude, current change trend and phase change relationship corresponding to each commutation moment;

[0098] Step 23: Based on the distortion comparison results corresponding to each commutation moment, adjust the voltage and current of the corresponding signal moment in the operating signal to obtain the commutation operating signal of the SWISS rectifier, and obtain the current and voltage characteristics corresponding to each commutation moment in the commutation operating signal.

[0099] Step 24: Determine the commutation voltage information, commutation current information, and commutation phase change information corresponding to each commutation moment based on the voltage adjustment process and the current adjustment process, and determine the commutation distortion presentation information corresponding to each commutation moment in combination with the corresponding current and voltage characteristics.

[0100] In this example, the operating signal represents an electrical signal that reflects the overall operating status of the rectifier, which is obtained by restoring the topological characteristics and circuit operating parameters of the SWISS rectifier.

[0101] In this example, the voltage amplitude represents the instantaneous magnitude of the voltage signal at the moment of commutation and is the core parameter reflecting the voltage intensity;

[0102] In this example, the current change trend represents the direction and rate of increase or decrease of the current over time at the commutation moment, reflecting the dynamic change characteristics of the current.

[0103] In this example, the phase change relationship represents the phase correspondence between voltage and current at the commutation moment, and between different phase voltages;

[0104] In this example, the multi-dimensional commutation distortion judgment rule represents a standardized rule system based on the commutation distortion principle of SWISS rectifier, constructed from multiple dimensions such as voltage amplitude deviation, abnormal current change, and phase offset range, used to determine whether distortion exists at the commutation moment.

[0105] In this example, distortion comparison refers to the process of comparing the voltage amplitude, current change trend, phase change relationship, and other features at the commutation moment with the multi-dimensional commutation distortion judgment rules one by one to determine whether they meet the distortion characteristics.

[0106] In this example, voltage adjustment refers to the process of correcting and optimizing the voltage component in the operating signal at the corresponding commutation moment based on the distortion comparison results, and eliminating invalid interference.

[0107] In this example, current adjustment refers to the process of correcting and optimizing the current component in the operating signal at the corresponding commutation moment based on the distortion comparison results, and eliminating invalid interference.

[0108] In this example, the commutation operation signal represents the optimized electrical signal obtained after voltage and current adjustment, which can accurately reflect the rectifier's operating state at the commutation moment;

[0109] In this example, the commutation voltage information represents the information recorded during the voltage adjustment process, such as the basis for voltage adjustment at the commutation moment, the adjustment range, and the voltage characteristics after adjustment.

[0110] In this example, the commutation current information represents the information recorded during the current adjustment process, such as the basis for current adjustment at the commutation moment, the adjustment range, and the current characteristics after adjustment.

[0111] In this example, the commutation phase change information represents the details of the changes in the phase relationship between voltage and current, and between different phase voltages during the commutation process, including information such as phase offset and rate of change.

[0112] The working principle and beneficial effects of the above technical solution are as follows: To solve the problems of fuzzy and lack of quantitative description in traditional distortion identification, this solution first combines the topological characteristics of the SWISS rectifier with reliable circuit operating parameters to accurately reconstruct the rectifier's operating signal, ensuring that the signal truly reflects the actual operating state of the rectifier. Furthermore, this signal is used to deduce the voltage amplitude, current change trend, and phase change relationship at the commutation moment. Then, based on the generation principle of commutation distortion in the SWISS rectifier, a distortion judgment rule covering multiple key dimensions such as voltage, current, and phase is constructed, effectively improving the accuracy of distortion judgment. Further, based on the distortion comparison results... The operating signal undergoes voltage and current adjustments to eliminate invalid interference components and optimize signal quality, resulting in a commutation operating signal that better reflects the actual commutation state. Current and voltage characteristics at the commutation moment are extracted from this signal, further focusing on core features related to distortion, simplifying the complexity of subsequent information integration. Finally, key information from the voltage and current adjustment processes is integrated with the extracted current and voltage characteristics to comprehensively analyze the commutation voltage, current, and phase change information at the commutation moment, ultimately forming complete commutation distortion presentation information. This provides a comprehensive and accurate basis for subsequent selection of target commutation moments, analysis of distortion patterns, and calculation of compensation duty cycles.

[0113] Example 4: Based on Example 1, the method for suppressing commutation distortion of a SWISS rectifier based on temporary duty cycle compensation, step 3 includes:

[0114] Step 31: Filter the target commutation time and the corresponding target commutation presentation information that meet the distortion conditions, use the target commutation presentation information to determine the distortion type, distortion time and distortion degree corresponding to each target commutation time, and generate the distortion visual information corresponding to each target commutation time;

[0115] Step 32: Based on the circuit operating parameters, reconstruct the commutation current leakage path corresponding to each target commutation moment, and combine the commutation current change trend corresponding to each target commutation moment to determine the logical relationship between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier and mark it in the corresponding distortion visual information.

[0116] Step 33: Analyze the commutation current leakage law and voltage distortion characteristics of the SWISS rectifier at each target commutation moment based on the annotated distortion visual information, and analyze the influence parameters of the voltage distortion characteristics on the duty cycle of the SWISS rectifier based on the commutation current leakage law.

[0117] Step 34: Using the effective duty cycle influence parameter that is higher than the specified influence parameter threshold, and combining it with the corresponding commutation current leakage law and voltage distortion characteristics, construct the compensation duty cycle model of the SWISS rectifier. Run the compensation duty cycle model to determine the compensation duty cycle corresponding to each target commutation moment and display it.

[0118] In this example, the distortion type represents the classification of the distortion that occurs at the commutation moment in terms of its manifestation, such as voltage clamping distortion, current abrupt distortion, phase shift distortion, etc., which are used to distinguish different distortion manifestation characteristics.

[0119] In this example, the distortion moment indicates the specific time point at which commutation distortion begins to occur, which is key information for accurately locating the distortion occurrence point.

[0120] In this example, the degree of distortion indicates the severity of commutation distortion, reflecting the magnitude of the deviation of voltage and current from the normal state;

[0121] In this example, the distortion visualization information represents the core information such as the distortion type, distortion time, and distortion degree at the target commutation moment, presented in a visual form such as graphics, curves, and annotations.

[0122] In this example, the commutation current leakage path indicates the specific transmission path of the current when leakage occurs because the current does not flow in the normal loop at the moment of commutation. It is the core basis for analyzing the current leakage phenomenon.

[0123] In this example, the phenomenon logic relationship represents the causal relationship or correlation between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier, that is, the logic of current leakage inducing or aggravating commutation distortion.

[0124] In this example, the duty cycle parameter represents a key parameter that can directly or indirectly affect the duty cycle setting of the SWISS rectifier switching transistor, thereby influencing the commutation distortion suppression effect, in relation to the commutation current leakage law and voltage distortion characteristics.

[0125] In this example, the compensated duty cycle model represents a mathematical model constructed based on the effective duty cycle influence parameters, the commutation current leakage law, and the voltage distortion characteristics.

[0126] The working principle and beneficial effects of the above technical solution are as follows: To ensure the accuracy and effectiveness of compensation execution and provide technical support for subsequent efficient suppression of commutation distortion, the target commutation moments and corresponding presentation information that meet the distortion conditions are first accurately screened. The distortion type, occurrence time, and severity of each target moment are clarified, avoiding interference from non-distortion moments. By generating distortion visualization information, abstract distortion data is transformed into an intuitive visualization form, reducing the complexity of subsequent pattern analysis. Then, the commutation current leakage path at the target commutation moment is reconstructed based on circuit operating parameters, ensuring the authenticity of the path reconstruction. Combined with the trend of commutation current changes, the logical relationship between current leakage and commutation distortion is clarified, establishing a causal link between the two. This provides a key basis for subsequent analysis of the root cause of distortion. Finally, this logical relationship is marked in the distortion visualization information, realizing information integration and correlation, allowing for more efficient analysis. Personnel can intuitively grasp the core causes of distortion. Further analysis of commutation current leakage patterns and voltage distortion characteristics within the labeled logically related visual information ensures the relevance and depth of the analysis. By focusing on current leakage patterns, the system accurately extracts duty cycle influencing parameters that significantly affect the duty cycle, eliminating irrelevant interference and simplifying the complexity of subsequent model construction. This also allows the calculation of the compensation duty cycle to focus more on core influencing factors, improving calculation accuracy. Finally, effective duty cycle influencing parameters above a threshold are selected, further simplifying model input and ensuring model efficiency and reliability. Combining effective parameters, current leakage patterns, and voltage distortion characteristics, a compensation duty cycle model is constructed. Model operation directly determines and displays the compensation duty cycle at each target commutation moment, achieving the quantification and feasibility of the compensation scheme and providing clear and precise operational guidelines for subsequent compensation execution.

[0127] Example 5: Based on Example 4, the method for suppressing commutation distortion of a SWISS rectifier based on temporary duty cycle compensation further includes:

[0128] The target commutation time and non-target commutation time of the SWISS rectifier at the current moment are statistically analyzed. A corresponding compensation duty cycle is added to each target commutation time, and a basic duty cycle is added to each non-target commutation time.

[0129] Calculate the total compensation duty cycle of the SWISS rectifier;

[0130] Calculate the sum of the basic duty cycles of the SWISS rectifier;

[0131] When the sum of the compensated duty cycles is higher than the sum of the base duty cycles, the range to be corrected for the base duty cycle is determined based on the numerical difference between the sum of the compensated duty cycles and the sum of the base duty cycles.

[0132] The base duty cycle is corrected within the range to be corrected until the sum of the compensated duty cycles is not higher than the sum of the base duty cycles.

[0133] In this example, the non-target commutation moment refers to the commutation moment when the SWISS rectifier does not exhibit distortion and does not require temporary duty cycle compensation at the current moment.

[0134] In this example, the base duty cycle is the default duty cycle set for each non-target commutation moment. It is the standard duty cycle setting of the switching transistors in the normal operating state of the SWISS rectifier without commutation distortion.

[0135] In this example, the range to be corrected represents a reasonable range within which the base duty cycle can be adjusted, determined based on the numerical difference between the two when the total sum of the compensated duty cycles is higher than the total sum of the base duty cycles.

[0136] The working principle and beneficial effects of the above technical solution are as follows: By statistically analyzing the duty cycle types at target and non-target commutation moments, calculating the sum of the two types of duty cycles, and dynamically correcting the base duty cycle, a duty cycle balancing mechanism is constructed. The core value lies in avoiding circuit operation imbalance caused by excessively high compensation duty cycles, further improving the closed-loop optimization of commutation distortion suppression. This ensures the distortion suppression effect at the target commutation moment and maintains the normal operation of the rectifier at non-target commutation moments, thereby improving the reliability of the entire suppression method and the stability of circuit operation.

[0137] Example 6: Based on Example 1, the method for suppressing commutation distortion of a SWISS rectifier based on temporary duty cycle compensation is characterized in that step 4 includes:

[0138] Step 41: Identify the distortion trigger time and distortion trigger duration corresponding to each target commutation time, and generate a duty cycle compensation signal for each target commutation time by combining the corresponding compensation duty cycle.

[0139] Step 42: Use the duty cycle compensation signal to input to the control terminal of the high-frequency switching transistor on the back side of the SWISS rectifier to temporarily compensate the voltage and current characteristics at the target commutation moment. During the compensation process, the phase compensation process corresponding to the target commutation moment is collected.

[0140] Step 43: Based on the phase compensation process, derive the operating parameters of the compensation circuit of the SWISS rectifier, determine whether the temporary compensation effect meets the expected target, and if not, adjust the compensation duty cycle corresponding to each target commutation moment to perform cyclic compensation for the target commutation moment.

[0141] In this example, the distortion trigger time refers to the specific time point at which commutation distortion begins to occur in each target commutation time;

[0142] In this example, the distortion trigger duration represents the duration of commutation distortion from start to end at each target commutation moment;

[0143] In this example, the duty cycle compensation signal represents a control signal generated by combining the distortion trigger time, the distortion trigger duration, and the compensation duty cycle.

[0144] In this example, the phase compensation process represents the dynamic process in which the phase relationship between voltage and current in the SWIS rectifier changes with the compensation action when the duty cycle is compensated for at the target commutation time.

[0145] In this example, the operating parameters of the compensation circuit are derived from the phase compensation process and reflect the operating status of the SWISS rectifier after the compensation is implemented.

[0146] In this example, cyclic compensation refers to the process of repeatedly compensating when the temporary compensation effect does not meet the expected target, adjusting the compensation duty cycle and performing the compensation operation again at the target commutation time until the compensation effect meets the target.

[0147] The working principle and beneficial effects of the above technical solution are as follows: To further improve the stability of commutation distortion suppression and the reliability of circuit operation, the distortion triggering time and duration at the target commutation moment are first identified, defining a clear time boundary for the compensation action. A duty cycle compensation signal is generated by combining the corresponding compensation duty cycle, transforming the abstract compensation parameters into control signals that can directly drive the switching transistors. This effectively converts compensation requirements into execution instructions, avoiding suppression failure caused by compensation being too early or too late. The duty cycle compensation signal is then directed to the control terminal of the high-frequency switching transistor on the back end, directly acting on the voltage and current characteristics at the target commutation moment. Simultaneously, the phase compensation process is collected in real time during compensation, fully recording the dynamic changes in compensation implementation. This provides real and comprehensive process data support for subsequent effect evaluation and parameter adjustment, avoiding blindly judging the compensation effect. Finally, the operating parameters of the compensation circuit are derived based on the phase compensation process. Quantitative data is used to objectively determine whether the compensation effect meets expectations. When the effect does not meet the standard, the compensation duty cycle is dynamically adjusted and cyclic compensation is performed to ensure that commutation distortion is fully suppressed, guaranteeing stable and compliant power quality at the rectifier input side.

[0148] Example 7: Based on Example 1, the method for suppressing commutation distortion of a SWISS rectifier based on temporary duty cycle compensation further includes:

[0149] The pre-compensation presentation features and post-compensation presentation features corresponding to each target commutation moment are obtained respectively, resulting in several simultaneous feature differences;

[0150] The operating rules of the SWISS rectifier are constructed based on the real-time multi-source parameters.

[0151] Filter the simultaneous feature difference of targets that conform to the above operating rules, and the target compensation duty cycle corresponding to the simultaneous feature difference of targets;

[0152] The target compensation duty cycle is regarded as the basic duty cycle of the SWISS rectifier and fed back into the SWISS rectifier.

[0153] In this example, the pre-compensation features represent the commutation distortion-related features that are presented at each target commutation moment before the temporary duty cycle compensation operation is performed;

[0154] In this example, the compensated features represent the commutation distortion-related features that appear at each target commutation moment after the duty cycle temporary compensation operation is performed;

[0155] In this example, the simultaneous feature difference represents the difference between the pre-compensation and post-compensation presentation features corresponding to the commutation time of the same target;

[0156] In this example, the operating pattern represents the stable correlation and change trend between various parameters and characteristics of the SWISS rectifier under normal operating conditions, which is summarized and refined based on the collected real-time multi-source parameters.

[0157] The working principle and beneficial effects of the above technical solution are as follows: By comparing the characteristics of the target commutation moment before and after compensation, constructing the rectifier operation law, and screening the effective target compensation duty cycle, the compensation cost of subsequent similar distortions is reduced, and the initial operating state of the rectifier is continuously optimized, thereby further improving the efficiency of commutation distortion suppression and the stability of circuit operation.

[0158] Example 8: This example provides a SWISS rectifier commutation distortion suppression system based on temporary duty cycle compensation, such as... Figure 2 As shown, it includes:

[0159] The parameter acquisition module is used to collect real-time multi-source parameters of the SWISS rectifier, and to perform synchronous preprocessing on the real-time multi-source parameters to obtain several circuit operation parameters of the SWISS rectifier.

[0160] The distortion identification module is used to reconstruct the voltage and current characteristics of the SWISS rectifier at each commutation moment based on the circuit operating parameters, and to analyze the commutation distortion presentation information at each commutation moment.

[0161] The distortion analysis module is used to screen target commutation moments that exhibit distortion, analyze the commutation current leakage pattern and voltage distortion characteristics of the target commutation moments, and determine the compensation duty cycle corresponding to the target commutation moments.

[0162] The compensation execution module is used to temporarily compensate the target commutation time according to the compensation duty cycle, and monitor whether the temporary compensation effect meets the expected target. If it does not meet the target, the module performs cyclic compensation on the target commutation time.

[0163] In this example, the SWISS rectifier represents a buck single-stage rectifier topology used in scenarios requiring AC / DC conversion, such as hydrogen production power supplies, which can achieve input-side power factor correction and output-side current and power control at the first-stage circuit level.

[0164] In this example, the real-time multi-source parameters represent various parameters related to the operation of the SWISS rectifier that are acquired in real time, including input voltage, DC current, output voltage, switching cycle-related parameters, etc.

[0165] In this example, synchronous preprocessing refers to a series of unified processes, such as temporal sorting, standardization, cross-validation, interference information filtering, and parameter adjustment, on the collected real-time multi-source parameters. The purpose is to improve the consistency and reliability of the parameters.

[0166] In this example, the circuit operating parameters represent reliable parameters obtained after synchronous preprocessing that accurately reflect the operating status of the SWISS rectifier and serve as the basis for subsequent distortion identification and compensation calculations.

[0167] In this example, voltage and current characteristics represent the core attributes that reflect the voltage and current operating states, such as the voltage amplitude, current change trend, and phase change relationship at the commutation moment.

[0168] In this example, the commutation moment refers to the specific moment when the current switches between different phases during the operation of the SWISS rectifier;

[0169] In this example, the commutation distortion information indicates various information related to commutation distortion, such as whether distortion exists at the commutation time, the type of distortion, the degree of distortion, and the start and duration of the distortion.

[0170] In this example, the commutation current leakage law represents the changes in the occurrence path, intensity trend, and influencing factors of the current leakage phenomenon at the commutation moment;

[0171] In this example, voltage distortion characteristics represent the core manifestations of voltage distortion at the commutation moment, including voltage clamping characteristics, voltage step amplitude, and voltage ripple distribution.

[0172] In this example, the compensation duty cycle is a specific value calculated for the target commutation moment to temporarily adjust the duty cycle of the high-frequency switch tube on the back side in order to suppress commutation distortion.

[0173] In this example, the expected target refers to the preset standard for commutation distortion suppression effect used to determine whether the compensation effect meets the standard. It usually includes the qualified range of quantitative indicators such as voltage distortion rate and current distortion rate.

[0174] The working principle and beneficial effects of the above technical solution are as follows: To effectively improve the power quality on the input side of the rectifier, firstly, real-time multi-source parameters are collected and synchronously preprocessed to comprehensively acquire the basic data of rectifier operation. Simultaneously, interference information is eliminated and abnormal parameters are corrected through standardization and cross-validation to ensure the accuracy and reliability of the output circuit operating parameters. Then, based on the reliable circuit operating parameters, the voltage and current characteristics at the commutation moment are reconstructed. Combined with the principle of commutation distortion, the distortion presentation information at each commutation moment is accurately analyzed, achieving comprehensive identification and quantitative description of commutation distortion. Furthermore, target commutation moments with distortion are further screened out. By deeply analyzing the leakage law of commutation current and the characteristics of voltage distortion, a targeted compensation duty cycle calculation logic is constructed to ensure that the determined compensation duty cycle is accurately matched with the degree of distortion, avoiding overcompensation or undercompensation caused by blind compensation. This provides a foundation for efficient suppression of commutation distortion. Finally, temporary compensation is performed according to the compensation duty cycle, and the compensation strategy is continuously adjusted through effect monitoring and cyclic optimization mechanisms to ensure that the commutation distortion suppression effect is stable and meets expectations. This effectively solves the problem of poor effect that may occur with single compensation. At the same time, the entire compensation process does not interfere with the original control loop, ensuring the stable operation of the rectifier and significantly improving the power quality on the input side.

[0175] Example 9: Based on Example 8, the distortion analysis module of the SWISS rectifier commutation distortion suppression system based on duty cycle temporary compensation includes:

[0176] A visual presentation unit is used to filter target commutation times that conform to the distortion conditions and corresponding target commutation presentation information, use the target commutation presentation information to determine the distortion type, distortion time and distortion degree corresponding to each target commutation time, and generate distortion visual information corresponding to each target commutation time.

[0177] The pattern analysis unit is used to reconstruct the commutation current leakage path corresponding to each target commutation moment according to the circuit operating parameters, and determine the logical relationship between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier by combining the commutation current change trend corresponding to each target commutation moment and mark it in the corresponding distortion visual information.

[0178] The parameter conversion unit is used to analyze the commutation current leakage law and voltage distortion characteristics of each target commutation moment of the SWISS rectifier based on the annotated distortion visual information, and to analyze the influence parameters of the voltage distortion characteristics on the duty cycle of the SWISS rectifier based on the commutation current leakage law.

[0179] The modeling and analysis unit is used to construct the compensation duty cycle model of the SWISS rectifier by using the effective duty cycle influence parameter that is higher than the specified influence parameter threshold, combined with the corresponding commutation current leakage law and voltage distortion characteristics. The compensation duty cycle model is run to determine and display the compensation duty cycle corresponding to each target commutation moment.

[0180] In this example, the distortion type represents the classification of the distortion that occurs at the commutation moment in terms of its manifestation, such as voltage clamping distortion, current abrupt distortion, phase shift distortion, etc., which are used to distinguish different distortion manifestation characteristics.

[0181] In this example, the distortion moment indicates the specific time point at which commutation distortion begins to occur, which is key information for accurately locating the distortion occurrence point.

[0182] In this example, the degree of distortion indicates the severity of commutation distortion, reflecting the magnitude of the deviation of voltage and current from the normal state;

[0183] In this example, the distortion visualization information represents the core information such as the distortion type, distortion time, and distortion degree at the target commutation moment, presented in a visual form such as graphics, curves, and annotations.

[0184] In this example, the commutation current leakage path indicates the specific transmission path of the current when leakage occurs because the current does not flow in the normal loop at the moment of commutation. It is the core basis for analyzing the current leakage phenomenon.

[0185] In this example, the phenomenon logic relationship represents the causal relationship or correlation between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier, that is, the logic of current leakage inducing or aggravating commutation distortion.

[0186] In this example, the duty cycle parameter represents a key parameter that can directly or indirectly affect the duty cycle setting of the SWISS rectifier switching transistor, thereby influencing the commutation distortion suppression effect, in relation to the commutation current leakage law and voltage distortion characteristics.

[0187] In this example, the compensated duty cycle model represents a mathematical model constructed based on the effective duty cycle influence parameters, the commutation current leakage law, and the voltage distortion characteristics.

[0188] The working principle and beneficial effects of the above technical solution are as follows: To ensure the accuracy and effectiveness of compensation execution and provide technical support for subsequent efficient suppression of commutation distortion, the target commutation moments and corresponding presentation information that meet the distortion conditions are first accurately screened. The distortion type, occurrence time, and severity of each target moment are clarified, avoiding interference from non-distortion moments. By generating distortion visualization information, abstract distortion data is transformed into an intuitive visualization form, reducing the complexity of subsequent pattern analysis. Then, the commutation current leakage path at the target commutation moment is reconstructed based on circuit operating parameters, ensuring the authenticity of the path reconstruction. Combined with the trend of commutation current changes, the logical relationship between current leakage and commutation distortion is clarified, establishing a causal link between the two. This provides a key basis for subsequent analysis of the root cause of distortion. Finally, this logical relationship is marked in the distortion visualization information, realizing information integration and correlation, allowing for more efficient analysis. Personnel can intuitively grasp the core causes of distortion. Further analysis of commutation current leakage patterns and voltage distortion characteristics within the labeled logically related visual information ensures the relevance and depth of the analysis. By focusing on current leakage patterns, the system accurately extracts duty cycle influencing parameters that significantly affect the duty cycle, eliminating irrelevant interference and simplifying the complexity of subsequent model construction. This also allows the calculation of the compensation duty cycle to focus more on core influencing factors, improving calculation accuracy. Finally, effective duty cycle influencing parameters above a threshold are selected, further simplifying model input and ensuring model efficiency and reliability. Combining effective parameters, current leakage patterns, and voltage distortion characteristics, a compensation duty cycle model is constructed. Model operation directly determines and displays the compensation duty cycle at each target commutation moment, achieving the quantification and feasibility of the compensation scheme and providing clear and precise operational guidelines for subsequent compensation execution.

Claims

1. A method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation, characterized in that, include: Step 1: Collect real-time multi-dimensional parameters of the SWISS rectifier, and perform synchronous preprocessing on the real-time multi-dimensional parameters to obtain several circuit operating parameters of the SWISS rectifier; Step 2: Based on the circuit operating parameters, reconstruct the voltage and current characteristics of the SWISS rectifier at each commutation moment, and analyze the commutation distortion information at each commutation moment; Step 2 includes: Step 21: Based on the topological characteristics of the SWISS rectifier and the circuit operating parameters, reconstruct the operating signal of the SWISS rectifier, and use the operating signal to deduce the voltage amplitude, current change trend and phase change relationship of the SWISS rectifier at each commutation moment; Step 22: Construct a multi-dimensional commutation distortion judgment rule based on the commutation distortion principle of the SWISS rectifier, and use the multi-dimensional commutation distortion judgment rule to compare the distortion of the voltage amplitude, current change trend and phase change relationship corresponding to each commutation moment; Step 23: Based on the distortion comparison results corresponding to each commutation moment, determine the voltage and current adjustments for the corresponding signal moments in the operating signal to obtain the commutation operating signal of the SWISS rectifier, and obtain the current and voltage characteristics corresponding to each commutation moment in the commutation operating signal; Step 24: Determine the commutation voltage information, commutation current information, and commutation phase change information corresponding to each commutation moment based on the voltage adjustment process and the current adjustment process, and determine the commutation distortion presentation information corresponding to each commutation moment in combination with the corresponding current and voltage characteristics; Step 3: Screen the target commutation time that shows distortion, analyze the commutation current leakage law and voltage distortion characteristics of the target commutation time, and determine the compensation duty cycle corresponding to the target commutation time; This includes: analyzing the influence parameters of the voltage distortion characteristics on the duty cycle of the SWISS rectifier based on the commutation current leakage law; Using effective duty cycle influence parameters that are higher than the specified influence parameter threshold, and combining them with the corresponding commutation current leakage law and voltage distortion characteristics, a compensation duty cycle model for the SWISS rectifier is constructed. The compensation duty cycle model is run to determine and display the compensation duty cycle corresponding to each target commutation moment. Step 4: Perform temporary compensation on the target commutation time according to the compensation duty cycle, and monitor whether the effect of temporary compensation meets the expected target. If not, perform cyclic compensation on the target commutation time. The expected target refers to the pre-set standard for commutation distortion suppression effect used to determine whether the compensation effect meets the standard, including the qualified range of voltage distortion rate and the qualified range of current distortion rate.

2. The method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation as described in claim 1, characterized in that, Step 1 includes: Step 11: Collect the real-time input side voltage, real-time DC side current, real-time output side voltage and switching cycle parameters of the SWISS rectifier and sort them in time sequence to obtain the real-time multi-dimensional parameters of the SWISS rectifier. Determine the real-time initial parameter value corresponding to each parameter source in the real-time multi-dimensional parameters. Step 12: Obtain the historical parameter patterns of the SWISS rectifier, and determine whether each real-time initial parameter value is consistent with the historical parameter patterns. If they are inconsistent, determine the parameter dimension and parameter value range corresponding to each parameter source based on the historical parameter patterns. Step 13: Standardize the real-time multivariate parameters according to the parameter dimensions and the parameter value range to obtain the real-time processing parameter value corresponding to each parameter source. Iteratively select several real-time processing parameter values ​​as a verification parameter set, and perform cross-validation on each unselected real-time processing parameter value in a loop. Step 14: Determine the parameter accuracy corresponding to each real-time processing parameter value based on the cross-validation results. When the parameter accuracy is abnormal, filter the corresponding interference information in the processed real-time multivariate parameters and adjust the real-time processing parameter values ​​synchronously to obtain several circuit operating parameters of the SWISS rectifier.

3. The method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation as described in claim 1, characterized in that, Step 3 includes: Step 31: Filter the target commutation time and the corresponding target commutation presentation information that meet the distortion conditions, use the target commutation presentation information to determine the distortion type, distortion time and distortion degree corresponding to each target commutation time, and generate the distortion visual information corresponding to each target commutation time; Step 32: Based on the circuit operating parameters, reconstruct the commutation current leakage path corresponding to each target commutation moment, and combine the commutation current change trend corresponding to each target commutation moment to determine the logical relationship between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier and mark it in the corresponding distortion visual information. Step 33: Analyze the commutation current leakage pattern and voltage distortion characteristics of the SWISS rectifier at each target commutation moment based on the annotated distortion visualization information.

4. The method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation as described in claim 3, characterized in that, Also includes: The target commutation time and non-target commutation time of the SWISS rectifier at the current moment are statistically analyzed. A corresponding compensation duty cycle is added to each target commutation time, and a basic duty cycle is added to each non-target commutation time. Calculate the total compensation duty cycle of the SWISS rectifier; Calculate the sum of the basic duty cycles of the SWISS rectifier; When the sum of the compensated duty cycles is higher than the sum of the base duty cycles, the range to be corrected for the base duty cycle is determined based on the numerical difference between the sum of the compensated duty cycles and the sum of the base duty cycles. The base duty cycle is corrected within the range to be corrected until the sum of the compensated duty cycles is not higher than the sum of the base duty cycles.

5. The method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation as described in claim 1, characterized in that, Step 4 includes: Step 41: Identify the distortion trigger time and distortion trigger duration corresponding to each target commutation time, and generate a duty cycle compensation signal for each target commutation time by combining the corresponding compensation duty cycle. Step 42: Use the duty cycle compensation signal to input to the control terminal of the high-frequency switching transistor on the back side of the SWISS rectifier to temporarily compensate the voltage and current characteristics at the target commutation moment. During the compensation process, the phase compensation process corresponding to the target commutation moment is collected. Step 43: Based on the phase compensation process, derive the operating parameters of the compensation circuit of the SWISS rectifier, determine whether the temporary compensation effect meets the expected target, and if not, adjust the compensation duty cycle corresponding to each target commutation moment to perform cyclic compensation for the target commutation moment.

6. The method for suppressing commutation distortion in a SWISS rectifier based on temporary duty cycle compensation as described in claim 1, characterized in that, Also includes: The pre-compensation presentation features and post-compensation presentation features corresponding to each target commutation moment are obtained respectively, resulting in several simultaneous feature differences; The operating rules of the SWISS rectifier are constructed based on the real-time multivariate parameters. Filter the simultaneous feature difference of targets that conform to the above operating rules, and the target compensation duty cycle corresponding to the simultaneous feature difference of targets; The target compensation duty cycle is regarded as the basic duty cycle of the SWISS rectifier and fed back into the SWISS rectifier.

7. A SWISS rectifier commutation distortion suppression system based on duty cycle temporary compensation, applied to the method of claim 1, characterized in that, include: The parameter acquisition module is used to collect real-time multi-dimensional parameters of the SWISS rectifier, and to perform synchronous preprocessing on the real-time multi-dimensional parameters to obtain several circuit operating parameters of the SWISS rectifier. The distortion identification module is used to reconstruct the voltage and current characteristics of the SWISS rectifier at each commutation moment based on the circuit operating parameters, and to analyze the commutation distortion presentation information at each commutation moment. The distortion analysis module is used to screen target commutation moments that exhibit distortion, analyze the commutation current leakage pattern and voltage distortion characteristics of the target commutation moments, and determine the compensation duty cycle corresponding to the target commutation moments. The compensation execution module is used to temporarily compensate the target commutation time according to the compensation duty cycle, and monitor whether the temporary compensation effect meets the expected target. If it does not meet the target, the module performs cyclic compensation on the target commutation time.

8. The SWISS rectifier commutation distortion suppression system based on duty cycle temporary compensation as described in claim 7, characterized in that, The distortion analysis module includes: A visual presentation unit is used to filter target commutation times that conform to the distortion conditions and corresponding target commutation presentation information, use the target commutation presentation information to determine the distortion type, distortion time and distortion degree corresponding to each target commutation time, and generate distortion visual information corresponding to each target commutation time. The pattern analysis unit is used to reconstruct the commutation current leakage path corresponding to each target commutation moment according to the circuit operating parameters, and determine the logical relationship between the current leakage phenomenon and the commutation distortion phenomenon of the SWISS rectifier by combining the commutation current change trend corresponding to each target commutation moment and mark it in the corresponding distortion visual information. The parameter conversion unit is used to analyze the commutation current leakage law and voltage distortion characteristics of each target commutation moment of the SWISS rectifier based on the annotated distortion visualization information, and to analyze the influence parameters of the voltage distortion characteristics on the duty cycle of the SWISS rectifier based on the commutation current leakage law. The compensation analysis unit is used to construct the compensation duty cycle model of the SWISS rectifier by using the effective duty cycle influence parameter that is higher than the specified influence parameter threshold, combined with the corresponding commutation current leakage law and voltage distortion characteristics, and to run the compensation duty cycle model to determine and display the compensation duty cycle corresponding to each target commutation moment.

Images