Method and system for evaluating dynamic performance of magnetic resistance type voltage stabilizer

Abstract

This invention relates to a method and system for evaluating the dynamic performance of a reactive voltage regulator. The method includes acquiring synchronously collected data during the operation of the reactive voltage regulator system; determining the disturbance occurrence time and the stabilization time based on the synchronously collected data, and extracting evaluation data segments based on these times; calculating voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segments to obtain dynamic response indicators; performing frequency domain analysis on the evaluation data segments, and calculating the total harmonic distortion rate improvement rate and harmonic suppression ratio based on the frequency domain analysis results to obtain harmonic suppression indicators; generating a comprehensive dynamic performance score based on the dynamic response indicators and harmonic suppression indicators, thereby generating the dynamic performance evaluation result of the reactive voltage regulator system. This invention improves the consistency of the evaluation.

Description

Technical Field

[0001] This invention belongs to the technical field of power quality assessment, and in particular relates to a method and system for evaluating the dynamic performance of magnetic reactance-based voltage regulation. Background Technology

[0002] Currently, magnetic reactance voltage stabilization systems are widely used in power systems and power load scenarios to maintain the stability of the output voltage on the load side under conditions such as grid voltage fluctuations and disturbances. During system operation, there are objective phenomena such as voltage transient changes and harmonic component changes, and the differences in dynamic response under different loads and operating conditions have a direct impact on power safety and power quality.

[0003] Existing performance evaluation methods for magnetic reactive voltage regulator systems typically employ index analysis based on test data to determine the system's operating status. This evaluation process is highly dependent on the accuracy of state switching before and after disturbances and the identification of stable states. Furthermore, it lacks consistency in the comprehensive evaluation of dynamic response and harmonic suppression, resulting in low comparability and reliability of the evaluation results. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for evaluating the dynamic performance of magnetic reactance voltage regulators, so as to solve the technical problem of deviation in evaluation results caused by inconsistent evaluation criteria in existing performance evaluation methods.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for evaluating the dynamic performance of a magnetic reactance-type voltage regulator, the method comprising: Acquire synchronous data during the operation of the magnetic reactance voltage regulator; The time of disturbance occurrence and the time of stability are determined based on the synchronously acquired data, and evaluation data segments are extracted based on the time of disturbance occurrence and the time of stability. Based on the evaluation data segment, the voltage recovery time, voltage regulation accuracy, and overshoot are calculated to obtain the dynamic response index; Frequency domain analysis is performed on the evaluation data segment, and the total harmonic distortion rate improvement rate and the harmonic suppression ratio of each order are calculated based on the frequency domain analysis results to obtain the harmonic suppression index. A comprehensive dynamic performance score is generated based on the dynamic response index and the harmonic suppression index, thereby generating a dynamic performance evaluation result for the magnetic reactive voltage regulator.

[0006] By adopting the above technical solution, and by acquiring synchronously collected data during the operation of the magnetic reactance voltage regulator, the key operating state changes on both the grid side and the load side can be fully recorded, thus providing a reliable data foundation for subsequent performance evaluation. By determining the disturbance occurrence time and the stabilization time based on the synchronously collected data and extracting the evaluation data segment, the disturbance response process and the steady-state convergence process can be accurately identified, thereby avoiding irrelevant data interference and improving the relevance and consistency of the evaluation results. By calculating the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators, the recovery speed, steady-state error, and peak deviation of the device under disturbance can be quantified, thereby achieving an objective comparison of dynamic voltage regulation capabilities. By performing frequency domain analysis on the evaluation data segment and calculating the total harmonic distortion rate improvement rate and the harmonic suppression ratio of each harmonic, the harmonic suppression index can be obtained, reflecting the degree of improvement of power quality by the device, thus supporting the formation of a comprehensive dynamic performance score and generating reliable dynamic performance evaluation results.

[0007] In one example, the present invention can be further configured as follows: the synchronous acquisition of data during the operation of the magnetic reactance voltage regulator includes: The grid-side voltage signal and grid-side current signal are collected to obtain the grid-side data. The load-side output voltage signal and control current signal are collected to obtain the data collected on the device side; The data collected from the power grid side and the data collected from the device side are time-aligned to generate the synchronously collected data.

[0008] By adopting the above technical solution, by collecting grid-side voltage and current signals as well as load-side output voltage and control current signals, and by performing time alignment processing on the grid-side and device-side collected data to generate synchronously collected data, it is possible to ensure that different signals correspond one-to-one at the same sampling time, thereby improving the accuracy and repeatability of disturbance identification, stability determination, and index calculation.

[0009] In one example, the present invention can be further configured as follows: determining the disturbance occurrence time and the stable time based on the synchronously acquired data, and extracting the evaluation data segment, includes: Based on the synchronously acquired data, the occurrence time of the voltage disturbance event is identified, and the occurrence time of the disturbance is determined; Based on the synchronously acquired data, determine the moment when the load-side output voltage signal enters a preset stable state, and determine the stable moment; The evaluation data segment is obtained by extracting data within the corresponding time range from the synchronously acquired data based on the time of the disturbance and the time of stability.

[0010] By adopting the above technical solution, the timing of voltage disturbance events is determined by identifying the occurrence time of the disturbance based on synchronously acquired data, and the timing of the load-side output voltage signal entering a preset stable state is determined to determine the stable time. Then, evaluation data segments are extracted based on the disturbance occurrence time and the stable time, which can form a unified evaluation window within the same disturbance event range, thereby ensuring that the dynamic response evaluation and harmonic suppression evaluation have the same caliber and improving the comparability of evaluation results.

[0011] In one example, the present invention can be further configured as follows: determining the moment when the load-side output voltage signal enters a preset stable state based on the synchronously acquired data, and determining the stable moment, includes: The candidate moment when the load-side output voltage signal enters the preset allowable deviation range is determined from the synchronously acquired data; After the candidate time, the load-side output voltage signal is continuously stable to determine the time when the load-side output voltage signal remains stable within a continuous preset sampling period as the stable time.

[0012] By adopting the above technical solution, by determining the candidate time when the load-side output voltage signal enters the preset allowable deviation range, and by continuously judging the stability of the load-side output voltage signal after the candidate time to determine the stable time, it is possible to avoid misjudgment caused by the brief return of the output voltage, thereby improving the reliability of steady-state identification and making the voltage recovery time and steady-state index calculation more consistent with the actual operation process.

[0013] In one example, the present invention can be further configured such that: the continuous stability determination of the load-side output voltage signal to determine the stable moment includes: After the candidate time, the continuous stability of the load-side output voltage signal is determined to obtain the voltage stability range. After the candidate time, the control current signal in the synchronously acquired data is continuously stable to obtain the current stable range. Based on the overlap between the voltage stability interval and the current stability interval, the moment when the load-side output voltage signal and the control current signal remain stable simultaneously is determined as the stability moment.

[0014] By adopting the above technical solution, the voltage stability range is obtained by continuously determining the stability of the output voltage signal on the load side, and the current stability range is obtained by continuously determining the stability of the control current signal in the synchronously acquired data. Then, the stability time is determined based on the overlap relationship between the two. This can simultaneously constrain the convergence of output voltage and the convergence of control regulation, thereby reducing the deviation caused by judging stability based on a single signal and improving the stability and reliability of the evaluation results.

[0015] In one example, the present invention can be further configured as follows: calculating the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators includes: The voltage recovery time is calculated based on the time of the disturbance occurrence and the time of stability. The voltage regulation accuracy is obtained by statistically calculating the load-side output voltage signal based on the steady-state range in the evaluation data segment. The maximum deviation of the load-side output voltage signal is determined based on the transient interval in the evaluation data segment, the overshoot is obtained, and the dynamic response index is generated.

[0016] By adopting the above technical solution, the voltage recovery time is calculated based on the time of disturbance occurrence and the time of stability, and the voltage regulation accuracy is obtained based on the steady-state range of the evaluation data segment. The overshoot is obtained based on the transient range and a dynamic response index is generated. This can comprehensively characterize the disturbance response characteristics from both time and amplitude perspectives, thereby providing a unified quantitative basis for comparing the dynamic performance of different devices or under different operating conditions.

[0017] In one example, the present invention can be further configured as follows: performing frequency domain analysis on the evaluation data segment and calculating the total harmonic distortion rate improvement rate and the harmonic suppression ratio of each order to obtain the harmonic suppression index includes: Frequency domain analysis is performed on the grid-side voltage signal in the evaluation data segment to obtain the grid-side fundamental component and each harmonic component of the grid side, and the total harmonic distortion rate of the grid side is calculated. Frequency domain analysis is performed on the load-side output voltage signal in the evaluation data segment to obtain the fundamental component and harmonic components of the load side, and the total harmonic distortion rate of the load side is calculated. The total harmonic distortion rate improvement rate is calculated based on the total harmonic distortion rate on the grid side and the total harmonic distortion rate on the load side, and the harmonic suppression ratio is calculated based on each harmonic component on the grid side and each harmonic component on the load side, so as to generate the harmonic suppression index.

[0018] By adopting the above technical solution, frequency domain analysis is performed on the grid-side voltage signal and the load-side output voltage signal in the evaluation data segment, and the total harmonic distortion rate of the grid side and the total harmonic distortion rate of the load side are calculated respectively. Then, the improvement rate of the total harmonic distortion rate is calculated and the suppression ratio of each harmonic is calculated to generate a harmonic suppression index. This can simultaneously reflect the overall harmonic pollution change and the suppression capability of each harmonic, thereby more accurately evaluating the device's effect on improving power quality.

[0019] In one example, the present invention can be further configured as follows: the calculation of the harmonic suppression ratio based on the harmonic components on the grid side and the harmonic components on the load side includes: A preset set of harmonic orders is determined based on the frequency domain analysis results; For each harmonic number in the preset harmonic number set, the corresponding grid-side harmonic components and load-side harmonic components are extracted respectively; The corresponding harmonic suppression ratio is calculated based on the harmonic components on the grid side and the harmonic components on the load side corresponding to each harmonic order, and the obtained harmonic suppression ratios are summarized into the harmonic suppression index.

[0020] By adopting the above technical solution, a preset set of harmonic orders can be determined based on the frequency domain analysis results. The corresponding harmonic components on the grid side and the harmonic components on the load side can be extracted to calculate the harmonic suppression ratio of each order and summarize it into a harmonic suppression index. This enables targeted quantitative analysis of key harmonic orders, thereby improving the fine granularity and interpretability of harmonic suppression assessment and supporting more refined performance comparison.

[0021] In one example, the present invention can be further configured as follows: generating a comprehensive dynamic performance score and a dynamic performance evaluation result based on the dynamic response index and the harmonic suppression index includes: The dynamic response index and the harmonic suppression index are normalized to obtain a set of normalized indices. The normalized index set is weighted and calculated based on preset weighting coefficients to generate the comprehensive dynamic performance score. The dynamic performance evaluation result of the magnetic reactive voltage regulator is generated based on the comprehensive dynamic performance score and the preset judgment conditions.

[0022] By adopting the above technical solution, a normalized index set is obtained by normalizing the dynamic response index and the harmonic suppression index. A comprehensive dynamic performance score is generated by weighting the scores based on preset weight coefficients. Then, a dynamic performance evaluation result is generated based on the comprehensive dynamic performance score and preset judgment conditions. This can unify multi-dimensional performance indicators to the same scoring scale, thereby improving the intuitiveness and decision-making of the evaluation conclusions and facilitating device performance screening and application matching.

[0023] In a second aspect, the present invention provides a dynamic performance evaluation system for magnetic reactance-type voltage regulation, the system comprising: The data acquisition module is used to acquire synchronous data during the operation of the magnetic reactance voltage regulator. The timing module is used to determine the time of disturbance occurrence and the time of stability based on the synchronously acquired data, and to extract evaluation data segments based on the time of disturbance occurrence and the time of stability. The response calculation module is used to calculate the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators. The harmonic analysis module is used to perform frequency domain analysis on the evaluation data segment, and calculate the total harmonic distortion rate improvement rate and the suppression ratio of each harmonic based on the frequency domain analysis results to obtain the harmonic suppression index. The scoring module is used to generate a comprehensive dynamic performance score based on the dynamic response index and the harmonic suppression index, and then generate the dynamic performance evaluation result of the magnetic reactive voltage regulator.

[0024] By adopting the above technical solution, and by acquiring synchronously collected data during the operation of the magnetic reactance voltage regulator, the key operating state changes on both the grid side and the load side can be fully recorded, thus providing a reliable data foundation for subsequent performance evaluation. By determining the disturbance occurrence time and the stabilization time based on the synchronously collected data and extracting the evaluation data segment, the disturbance response process and the steady-state convergence process can be accurately identified, thereby avoiding irrelevant data interference and improving the relevance and consistency of the evaluation results. By calculating the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators, the recovery speed, steady-state error, and peak deviation of the device under disturbance can be quantified, thereby achieving an objective comparison of dynamic voltage regulation capabilities. By performing frequency domain analysis on the evaluation data segment and calculating the total harmonic distortion rate improvement rate and the harmonic suppression ratio of each harmonic, the harmonic suppression index can be obtained, reflecting the degree of improvement of power quality by the device, thus supporting the formation of a comprehensive dynamic performance score and generating reliable dynamic performance evaluation results. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart of a dynamic performance evaluation method for magnetic reactive voltage regulation in an embodiment of the present invention; Figure 2 This is a structural block diagram of the magnetic reactive voltage stabilization dynamic performance evaluation system according to an embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0027] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0028] Example 1 like Figure 1 As shown, this invention discloses a method for evaluating the dynamic performance of a magnetic reactance-type voltage regulator, which specifically includes the following steps: S10: Acquire synchronous data during the operation of the magnetic reactance voltage regulator.

[0029] Specifically, during the operation of the magnetic reactance voltage regulator, electrical quantities related to the voltage regulation dynamic characteristics during the operation of the device are continuously collected according to a unified sampling period. A timestamp and sampling sequence number are added to each frame of sampling results to form a continuous time-series data stream. The integrity of the continuous time-series data stream is checked to remove abnormal missing or duplicate sampling frames, thereby obtaining synchronously collected data that can be used for subsequent disturbance identification, stability determination and index calculation.

[0030] S20: Determine the time of disturbance occurrence and the time of stability based on the synchronously acquired data, and extract the evaluation data segment according to the time of disturbance occurrence and the time of stability.

[0031] Specifically, time-series analysis is performed on the voltage time-series changes in the synchronously acquired data to locate the time boundary of the disturbance trigger, and the convergence process of the output voltage after the disturbance is tracked to determine the time boundary of stable convergence. Then, the data corresponding to the time range is extracted from the synchronously acquired data as the evaluation data segment using the time index of the disturbance occurrence time and the stable time, so as to complete the unified evaluation of dynamic response and harmonic suppression capability within the same disturbance event range.

[0032] S30: Calculate the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain the dynamic response index.

[0033] Specifically, based on the evaluation data segment, the transient change process and steady-state deviation level of the load-side output voltage signal are statistically analyzed to obtain the voltage recovery time, which characterizes the recovery speed, the voltage regulation accuracy, which characterizes the steady-state error, and the overshoot, which characterizes the peak deviation. The voltage recovery time, voltage regulation accuracy, and overshoot are correlated and summarized to form a dynamic response index to characterize the dynamic voltage regulation capability of the magnetic reactance voltage regulator under disturbance conditions.

[0034] S40: Perform frequency domain analysis on the evaluation data segment, and calculate the total harmonic distortion rate improvement rate and the harmonic suppression ratio based on the frequency domain analysis results to obtain the harmonic suppression index.

[0035] Specifically, frequency domain analysis is performed on the voltage signal in the evaluation data segment to extract the fundamental component and each harmonic component. Based on the frequency domain analysis results, the total harmonic distortion rate on the grid side and the improvement rate between the two are calculated. At the same time, the suppression relationship between each harmonic component on the grid side and the load side is calculated to obtain the suppression ratio of each harmonic. Then, the improvement rate of the total harmonic distortion rate and the suppression ratio of each harmonic are summarized to generate a harmonic suppression index to characterize the power quality improvement capability of the magnetic reactance voltage regulator.

[0036] S50: Generate a comprehensive dynamic performance score based on dynamic response index and harmonic suppression index, and then generate the dynamic performance evaluation result of the magnetic reactive voltage regulator.

[0037] Specifically, the dynamic response index and harmonic suppression index are processed with unified dimensions to obtain comparable index quantification results. Based on the preset weight relationship, the indexes are comprehensively calculated to obtain a comprehensive dynamic performance score. Then, the dynamic performance evaluation results of the magnetic reactive voltage regulator are output according to the comprehensive dynamic performance score and preset judgment conditions, so as to achieve a unified evaluation of the dynamic performance of the device under different disturbance conditions.

[0038] In one embodiment, step S10, namely acquiring synchronously collected data during the operation of the magnetic reactance voltage regulator, includes: S11: Collect grid-side voltage and current signals to obtain grid-side data.

[0039] Specifically, the grid-side voltage signal u at the device connection point is measured using high-precision voltage and current sensors. grid (t) and current signal i grid (t) Perform real-time data acquisition and set the sampling frequency f. s The sampling frequency is ≥10kHz to capture the details of rapid changes in voltage and current signals. At the same time, the continuous sampling duration is set to T≥10s to cover a more complete power grid operating state and avoid the omission of disturbance information due to a short sampling window. During the sampling process, a timestamp is recorded for each sampling point for subsequent time positioning and index calculation, thereby obtaining the power grid side data.

[0040] S12: Collect the output voltage signal and control current signal on the load side to obtain the data collected on the device side.

[0041] Specifically, at the load-side output terminal of the magnetic reactance voltage regulator, the load-side output voltage signal u is... load (t) is synchronously acquired, and the control current signal i used by the device itself to adjust the magnetic reactance is also acquired. c (t) performs synchronous acquisition, so that u load (t) and i c (t) forms a corresponding set of data frames under the same sampling frequency and the same time series, where uload (t) is used to reflect the target voltage output level after the device is regulated, i c (t) is used to reflect the internal adjustment process and stable convergence characteristics of the device, thereby obtaining the data collected on the device side.

[0042] S13: Perform time alignment processing on the data collected from the power grid side and the data collected from the device side to generate synchronously collected data.

[0043] Specifically, the data collected from the power grid side and the data collected from the device side are mapped to a unified time base. The timestamps of the two types of data are aligned and rearranged according to a unified sampling time sequence. For sampling points with sampling jitter or individual missing points, interpolation or resampling is performed to maintain the one-to-one correspondence between the power grid side and the device side signals at the same sampling time. The aligned power grid side data and the aligned device side data are then fused and spliced ​​to form synchronously collected data for subsequent disturbance judgment and index calculation.

[0044] In one embodiment, step S20, namely determining the time of disturbance occurrence and the time of stability based on synchronously acquired data, and extracting evaluation data segments, includes: S21: Identify the occurrence time of voltage disturbance events based on synchronously acquired data, and determine the time of disturbance occurrence.

[0045] Specifically, the rated voltage U is preset. N As a reference parameter, and setting the allowable voltage deviation threshold ΔU lim Based on synchronously acquired data, the grid-side voltage signal u grid (t) Perform deviation judgment, and determine the moment when the grid-side voltage first exceeds the allowable deviation range as the disturbance occurrence time t0, where |u grid (t0) U N |>ΔU lim The moment corresponds to the instant when the grid-side voltage begins to fluctuate abnormally, thus enabling accurate recording of the disturbance initiation point for subsequent evaluation data segment extraction and recovery time calculation.

[0046] S22: Determine the moment when the load-side output voltage signal enters the preset stable state based on the synchronously acquired data, and determine the stable moment.

[0047] Specifically, based on synchronously acquired data, the load-side output voltage signal u load (t) The allowable range is determined, and the moment when the load-side output voltage first enters and remains within the allowable range is defined as the stable time t1, where the allowable range is determined by [U N ΔU lim U N +ΔU limThis is used to constrain the output voltage after voltage regulation to be within a reasonable deviation range, and at the same time to confirm the continuous stability after entering the allowable range to avoid misjudgment caused by short-term fluctuations, thereby obtaining the stable moment that characterizes the stable output of the device.

[0048] S23: Extract data from the synchronously acquired data within the corresponding time range based on the time of disturbance occurrence and the time of stabilization to obtain the evaluation data segment.

[0049] Specifically, the time t0 when the disturbance occurs is taken as the starting boundary of the evaluation, and the time t1 when the stability is reached is taken as the ending boundary of the evaluation. The set of sampling frames within the time range of [t0, t1] is extracted from the synchronously acquired data, and the synchronous correspondence of the data of each channel within the frame is maintained. This ensures that the evaluation data segment fully covers the entire process of disturbance occurrence, device adjustment and output recovery, thereby providing a data basis for the unified calculation of subsequent dynamic response index and harmonic suppression index.

[0050] In one embodiment, step S22, namely determining the moment when the load-side output voltage signal enters a preset stable state based on synchronously acquired data, includes: S221: Determine the candidate moment when the load-side output voltage signal enters the preset allowable deviation range in the synchronously acquired data.

[0051] Specifically, the load-side output voltage signal u is calculated based on synchronously acquired data. load (t) relative to the rated voltage U N The deviation, and the deviation satisfies |u load (t) U N |≤ΔU lim The corresponding sampling time is recorded as a candidate time, so that the candidate time reflects the time position when the load side output voltage first returns to the allowable deviation range, which is used for setting the window start point for subsequent continuous stability determination.

[0052] S222: After the candidate time, perform continuous stability determination on the load-side output voltage signal to determine the time when the load-side output voltage signal remains stable within a continuous preset sampling period as the stable time.

[0053] Specifically, the load-side output voltage signal u after the candidate time is taken as the starting point. load (t) Perform continuous stability determination and continuously verify |u in the subsequent 5 consecutive sampling periods. load (t) U N |≤ΔU lim Whether the condition is met or not, and when the continuous stability determination is met, the sampling time corresponding to the candidate time is determined as the stable time t1, so that the stable time can characterize the starting time when the output voltage enters the allowable range and remains stable.

[0054] In one embodiment, step S222, namely, performing a continuous stability determination on the load-side output voltage signal to determine the stable moment, includes: S2221: After the candidate time, the continuous stability of the load-side output voltage signal is determined to obtain the voltage stability range.

[0055] Specifically, a continuous decision window is set after the candidate time point, and the load-side output voltage signal u is detected point by point. load The allowable range constraint of (t), when |u load (t) U N |≤ΔU lim When the condition is met continuously for 5 consecutive sampling periods, the continuous time range that meets the condition is marked as the voltage stability interval, so that the voltage stability interval can be used to characterize the time range during which the output voltage is kept stable.

[0056] S2222: After the candidate time, the control current signal in the synchronously acquired data is continuously stable to obtain the current stable range.

[0057] Specifically, the control current signal i is extracted from the synchronously acquired data after the candidate time point. c (t) and perform time-series tracking of the change amplitude of its adjacent sampling points, when i c (t) When the change remains stable and there is no significant transition within a continuous preset sampling period, the continuous time range that meets the condition is marked as the current stable interval, so that the current stable interval can be used to characterize the time range during which the device adjustment process enters the convergence state.

[0058] S2223: Based on the overlap between the voltage stability interval and the current stability interval, the moment when the load-side output voltage signal and the control current signal remain stable simultaneously is determined as the stability moment.

[0059] Specifically, the voltage stability interval and the current stability interval are matched to determine the overlapping interval, and the starting time of the overlapping interval is determined as the stability time t1. This ensures that the stability time simultaneously meets the judgment conditions of output voltage stability and control current convergence, thereby improving the reliability of steady-state identification and reducing misjudgments caused by relying solely on voltage regression.

[0060] In one embodiment, step S30, which calculates the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators, includes: S31: Calculate the voltage recovery time based on the time of disturbance occurrence and the time of stabilization.

[0061] Specifically, the time when the disturbance occurs is recorded as t0 and the stable time is recorded as t1. Then, t...r =t1 t0 calculates the voltage recovery time t r Where t0 is the first time the grid-side voltage exceeds the allowable deviation threshold ΔU. lim At time t1, the load-side output voltage first enters the allowable range and remains stable, making t r This is used to quantify the time it takes for the device to recover to a steady state after a disturbance occurs.

[0062] S32: Statistical calculations are performed on the load-side output voltage signal based on the steady-state interval in the evaluation data segment to obtain the voltage regulation accuracy.

[0063] Specifically, in the evaluation data segment, the time period [t1, T] after the device has been operating stably is determined as the steady-state interval, starting from the stable time t1. Within the steady-state interval, the maximum deviation between the load-side output voltage and the rated voltage is searched to calculate the voltage regulation accuracy δ. U ,in u load (t) represents the load-side output voltage signal, U N For the rated voltage, δ U Used to characterize the maximum deviation of the device's steady-state output voltage from its ideal rated voltage.

[0064] S33: Determine the maximum deviation of the load-side output voltage signal based on the transient interval in the evaluation data segment, obtain the overshoot, and generate dynamic response index.

[0065] Specifically, in the evaluation data segment, the time range [t0, t1] between the disturbance occurrence time t0 and the stable time t1 is used as the transient interval. Within the transient interval, the maximum magnitude of the load-side output voltage exceeding the rated voltage and the maximum transient rise of the grid-side voltage relative to the rated voltage are calculated to obtain the overshoot σ. u grid (t) represents the grid-side voltage signal, and σ is used to quantify the ratio of the transient exceedance of the output voltage to the disturbance amplitude during the device regulation process and to evaluate the regulation stability under transient conditions.

[0066] In one embodiment, step S40 involves performing frequency domain analysis on the evaluation data segment and calculating the total harmonic distortion rate improvement rate and the suppression ratio of each harmonic to obtain the harmonic suppression index, including: S41: Perform frequency domain analysis on the grid-side voltage signal in the evaluation data segment to obtain the grid-side fundamental component and each harmonic component of the grid side, and calculate the total harmonic distortion rate of the grid side.

[0067] Specifically, Fourier decomposition is performed on the grid-side voltage signal to obtain... Where U1 is the effective value of the fundamental voltage, Un The effective value of the nth harmonic voltage is given, where ω = 2πf and f = 50Hz is the fundamental frequency of the power grid, and the values ​​are based on the harmonic components U on the power grid side. (n,grid) With fundamental component U (1,grid) Calculate the total harmonic distortion (THD) on the power grid side. grid ,in THD grid Used to characterize the degree of harmonic pollution of the grid-side voltage before the device is connected.

[0068] S42: Perform frequency domain analysis on the load-side output voltage signal in the evaluation data segment to obtain the fundamental component and harmonic components of the load side, and calculate the total harmonic distortion rate of the load side.

[0069] Specifically, the same Fourier decomposition is performed on the load-side output voltage signal to obtain the load-side harmonic components U. (n,load) With fundamental component U (1,load) and based on U (n,load) with U (1,load) Calculate the total harmonic distortion (THD) on the load side. load ,in THD load Used to characterize the harmonic level of the load-side output voltage after the device is regulated.

[0070] S43: Calculate the total harmonic distortion rate improvement rate based on the total harmonic distortion rate on the grid side and the total harmonic distortion rate on the load side, and calculate the harmonic suppression ratio based on each harmonic component on the grid side and each harmonic component on the load side to generate a harmonic suppression index.

[0071] Specifically, based on THD grid With THD load Calculate the total harmonic distortion rate improvement ηTHD, where , so that η THD This is used to quantify the improvement in total harmonic distortion (THD) on the load side relative to the THD on the grid side after the device is connected, and to calculate the suppression ratio K of each harmonic for the nth harmonic. n ,in and η THD With each K n Together, they constitute the harmonic suppression index to characterize the overall harmonic improvement effect and the ability to suppress individual harmonics.

[0072] In one embodiment, step S43, which calculates the harmonic suppression ratio based on the harmonic components on the grid side and the harmonic components on the load side, includes: S431: Determine the preset harmonic order set based on the frequency domain analysis results.

[0073] Specifically, based on the frequency domain analysis results, the amplitude distribution of harmonic components is statistically analyzed, and a preset set of harmonic orders is selected in conjunction with the typical harmonic components of concern for power quality. The preset set of harmonic orders includes several harmonic orders n=3, 5, 7, ..., 25, so as to conduct targeted quantitative analysis of the suppression characteristics of common odd harmonics.

[0074] S432: For each harmonic number in the preset harmonic number set, extract the corresponding grid-side harmonic components and load-side harmonic components respectively.

[0075] Specifically, iterate through each harmonic number n in the preset harmonic number set and extract the corresponding U from the power grid side spectrum. (n,grid) Extract the corresponding U from the load-side spectrum (n,load) This ensures that each harmonic order n forms a one-to-one correspondence between the harmonic components on the grid side and the load side, and serves as the input for calculating the suppression ratio of subsequent harmonics.

[0076] S433: Calculate the corresponding harmonic suppression ratio based on the grid-side harmonic components and load-side harmonic components corresponding to each harmonic order, and summarize the obtained harmonic suppression ratios into a harmonic suppression index.

[0077] Specifically, for each harmonic order n, based on Calculate the corresponding harmonic suppression ratio for each harmonic order, and assign K to different harmonic orders. n The harmonic suppression ratios are summarized in order of harmonic order to form a set of harmonic suppression ratios, such that the set of harmonic suppression ratios is equal to η. THD Together they constitute the harmonic suppression index and are used for fusion calculation in the subsequent comprehensive scoring stage.

[0078] In one embodiment, step S50, namely generating a comprehensive dynamic performance score and a dynamic performance evaluation result based on the dynamic response index and harmonic suppression index, includes: S51: Normalize the dynamic response index and the harmonic suppression index to obtain a normalized index set.

[0079] Specifically, the voltage recovery time t r Voltage regulation accuracy δ U With overshoot σ and total harmonic distortion rate improvement η THD As input indicators, each indicator is mapped to a comparable normalized indicator value based on a preset dimensional unification rule. The normalized indicator values ​​are then organized into a set of normalized indicators according to dynamic response class and harmonic suppression class, so as to provide a unified scale input for the weighted fusion of comprehensive dynamic performance scores.

[0080] S52: Based on preset weighting coefficients, perform weighted calculations on the normalized index set to generate a comprehensive dynamic performance score.

[0081] Specifically, a comprehensive dynamic performance scoring model S is constructed, and weight coefficients α1, α2, α3, and α4 are assigned to each indicator in the normalized index set. Perform weighted calculations, where t lim The maximum allowable recovery time is preset and used to measure whether the voltage recovery time meets the fast response requirement. It also satisfies α1+α2+α3+α4=1 to ensure the normalization of weight allocation. At the same time, the scoring results are limited to S∈[0,1] to form a unified and intuitive comprehensive scoring scale.

[0082] S53: Generate the dynamic performance evaluation results of the magnetic reactive voltage regulator based on the comprehensive dynamic performance score and preset judgment conditions.

[0083] Specifically, the comprehensive dynamic performance score S is compared with the preset qualified threshold to output the corresponding evaluation conclusion. The evaluation conclusion and the comprehensive dynamic performance score S are then correlated and packaged to generate the dynamic performance evaluation result of the magnetic reactance voltage regulator, so that the evaluation result can be used for the qualification judgment and performance comparison analysis of the device's dynamic performance.

[0084] Example 2 like Figure 2 As shown, based on the same inventive concept as the above embodiments, the present invention also provides a dynamic performance evaluation system for magnetic reactance-type voltage regulation, comprising: The data acquisition module is used to acquire synchronous data during the operation of the magnetic reactance voltage regulator. The timing module is used to determine the time of disturbance occurrence and the time of stability based on synchronously acquired data, and to extract evaluation data segments based on the time of disturbance occurrence and the time of stability. The response calculation module is used to calculate the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators. The harmonic analysis module is used to perform frequency domain analysis on the evaluation data segment, and calculate the total harmonic distortion rate improvement rate and the suppression ratio of each harmonic based on the frequency domain analysis results, thereby obtaining the harmonic suppression index. The scoring module is used to generate a comprehensive dynamic performance score based on the dynamic response index and the harmonic suppression index, and then generate the dynamic performance evaluation result of the magnetic reactance voltage regulator.

[0085] Optionally, the data acquisition module includes: The grid-side acquisition submodule is used to acquire grid-side voltage and current signals to obtain grid-side acquisition data. The device acquisition submodule is used to acquire the load-side output voltage signal and control current signal to obtain the device-side acquisition data. The alignment submodule is used to perform time alignment processing on the data collected from the power grid side and the data collected from the device side to generate synchronized data.

[0086] Optional, the timing module includes: The disturbance identification submodule is used to identify the occurrence time of voltage disturbance events based on synchronously acquired data, and to determine the time of disturbance occurrence. The steady-state determination submodule is used to determine the moment when the load-side output voltage signal enters a preset steady state based on synchronously acquired data, and to determine the steady-state moment. The data extraction submodule is used to extract data from the synchronously acquired data within the corresponding time range based on the time of disturbance occurrence and the time of stability, so as to obtain the evaluation data segment.

[0087] Optionally, the steady-state determination submodule includes: The candidate positioning unit is used to determine the candidate moment when the load-side output voltage signal enters the preset allowable deviation range in the synchronously acquired data; The continuous stability determination unit is used to continuously determine the stability of the load-side output voltage signal after the candidate time, so as to determine the time when the load-side output voltage signal remains stable within a continuous preset sampling period as the stable time.

[0088] Optionally, the continuous stability determination unit includes: The voltage stabilization subunit is used to determine the continuous stability of the load-side output voltage signal after the candidate time point to obtain the voltage stability range. The current stabilization subunit is used to continuously determine the stability of the control current signal in the synchronously acquired data after the candidate time point, and obtain the current stable range. The overlapping determination sub-unit is used to determine the moment when the load-side output voltage signal and control current signal remain stable simultaneously, based on the overlapping relationship between the voltage stable interval and the current stable interval.

[0089] Optionally, the response calculation module includes: The recovery calculation submodule is used to calculate the voltage recovery time based on the time of the disturbance occurrence and the steady-state time. The accuracy statistics submodule is used to perform statistical calculations on the load-side output voltage signal based on the steady-state range in the evaluation data segment to obtain the voltage regulation accuracy. The overshoot calculation submodule is used to determine the maximum deviation of the load-side output voltage signal based on the transient interval in the evaluation data segment, obtain the overshoot, and generate dynamic response indicators.

[0090] Optionally, the harmonic analysis module includes: The grid-side frequency analysis submodule is used to perform frequency domain analysis on the grid-side voltage signal in the evaluation data segment, obtain the grid-side fundamental component and the grid-side harmonic components, and calculate the grid-side total harmonic distortion rate. The load frequency analysis submodule is used to perform frequency domain analysis on the load-side output voltage signal in the evaluation data segment, obtain the fundamental component and each harmonic component of the load side, and calculate the total harmonic distortion rate of the load side. The index generation submodule is used to calculate the total harmonic distortion improvement rate based on the total harmonic distortion rate on the grid side and the total harmonic distortion rate on the load side, and to calculate the harmonic suppression ratio based on each harmonic component on the grid side and each harmonic component on the load side, so as to generate harmonic suppression index.

[0091] Optionally, the indicator generation submodule includes: The harmonic order determination unit is used to determine a preset set of harmonic orders based on frequency domain analysis results. The component extraction unit is used to extract the corresponding grid-side harmonic components and load-side harmonic components for each harmonic number in the preset harmonic number set. The suppression summary unit is used to calculate the corresponding harmonic suppression ratio based on the grid-side harmonic components and load-side harmonic components corresponding to each harmonic order, and summarize the obtained harmonic suppression ratios into a harmonic suppression index.

[0092] Optional, the scoring module includes: The normalization submodule is used to normalize the dynamic response index and the harmonic suppression index to obtain a set of normalized indices. The weighted scoring submodule is used to perform weighted calculations on the normalized index set based on preset weight coefficients to generate a comprehensive dynamic performance score. The result determination submodule is used to generate dynamic performance evaluation results for the magnetic reactive voltage regulator based on the comprehensive dynamic performance score and preset determination conditions.

[0093] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the dynamic performance of a magnetic reactance-type voltage regulator, characterized in that, The method includes: Acquire synchronous data during the operation of the magnetic reactance voltage regulator system; The time of disturbance occurrence and the time of stability are determined based on the synchronously acquired data, and evaluation data segments are extracted based on the time of disturbance occurrence and the time of stability. Based on the evaluation data segment, the voltage recovery time, voltage regulation accuracy, and overshoot are calculated to obtain the dynamic response index; Frequency domain analysis is performed on the evaluation data segment, and the total harmonic distortion rate improvement rate and the harmonic suppression ratio of each order are calculated based on the frequency domain analysis results to obtain the harmonic suppression index. Based on the dynamic response index and the harmonic suppression index, a comprehensive dynamic performance score is generated, which in turn generates the dynamic performance evaluation result of the magnetic reactive voltage regulator system.

2. The dynamic performance evaluation method for magnetic reactance voltage regulation according to claim 1, characterized in that, The synchronous data acquired during the operation of the magnetic reactance voltage regulator system includes: The grid-side voltage signal and grid-side current signal are collected to obtain the grid-side data. The load-side output voltage signal and control current signal are collected to obtain the system-side data. The data collected from the power grid side and the data collected from the system side are time-aligned to generate the synchronously collected data.

3. The method for evaluating the dynamic performance of magnetic reactance-type voltage regulation according to claim 1, characterized in that, The process of determining the time of disturbance occurrence and the time of stability based on the synchronously acquired data, and extracting evaluation data segments, includes: Based on the synchronously acquired data, the occurrence time of the voltage disturbance event is identified, and the occurrence time of the disturbance is determined; Based on the synchronously acquired data, determine the moment when the load-side output voltage signal enters a preset stable state, and determine the stable moment; The evaluation data segment is obtained by extracting data within the corresponding time range from the synchronously acquired data based on the time of the disturbance and the time of stability.

4. The dynamic performance evaluation method for magnetic reactance voltage regulation according to claim 3, characterized in that, The step of determining the moment when the load-side output voltage signal enters a preset stable state based on the synchronously acquired data, and determining the stable moment, includes: The candidate moment when the load-side output voltage signal enters the preset allowable deviation range is determined from the synchronously acquired data; After the candidate time, the load-side output voltage signal is continuously stable to determine the time when the load-side output voltage signal remains stable within a continuous preset sampling period as the stable time.

5. The dynamic performance evaluation method for magnetic reactive voltage regulation according to claim 4, characterized in that, The step of determining the continuous stability of the load-side output voltage signal to identify the stable moment includes: After the candidate time, the continuous stability of the load-side output voltage signal is determined to obtain the voltage stability range. After the candidate time, the control current signal in the synchronously acquired data is continuously stable to obtain the current stable range. Based on the overlap between the voltage stability interval and the current stability interval, the moment when the load-side output voltage signal and the control current signal remain stable simultaneously is determined as the stability moment.

6. The dynamic performance evaluation method for magnetic reactance voltage regulation according to claim 1, characterized in that, The dynamic response indicators are obtained by calculating the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment, including: The voltage recovery time is calculated based on the time of the disturbance occurrence and the time of stability. The voltage regulation accuracy is obtained by statistically calculating the load-side output voltage signal based on the steady-state range in the evaluation data segment. The maximum deviation of the load-side output voltage signal is determined based on the transient interval in the evaluation data segment, the overshoot is obtained, and the dynamic response index is generated.

7. The dynamic performance evaluation method for magnetic reactance voltage regulation according to claim 2, characterized in that, The evaluation data segment is subjected to frequency domain analysis, and the total harmonic distortion rate improvement rate and the harmonic suppression ratio of each order are calculated to obtain harmonic suppression indices, including: Frequency domain analysis is performed on the grid-side voltage signal in the evaluation data segment to obtain the grid-side fundamental component and each harmonic component of the grid side, and the total harmonic distortion rate of the grid side is calculated. Frequency domain analysis is performed on the load-side output voltage signal in the evaluation data segment to obtain the fundamental component and harmonic components of the load side, and the total harmonic distortion rate of the load side is calculated. The total harmonic distortion rate improvement rate is calculated based on the total harmonic distortion rate on the grid side and the total harmonic distortion rate on the load side, and the harmonic suppression ratio is calculated based on each harmonic component on the grid side and each harmonic component on the load side, so as to generate the harmonic suppression index.

8. The method for evaluating the dynamic performance of magnetic reactance-type voltage regulation according to claim 7, characterized in that, The calculation of the harmonic suppression ratio based on the harmonic components on the power grid side and the harmonic components on the load side includes: A preset set of harmonic orders is determined based on the frequency domain analysis results; For each harmonic number in the preset harmonic number set, the corresponding grid-side harmonic components and load-side harmonic components are extracted respectively; The corresponding harmonic suppression ratio is calculated based on the harmonic components on the grid side and the harmonic components on the load side corresponding to each harmonic order, and the obtained harmonic suppression ratios are summarized into the harmonic suppression index.

9. The method for evaluating the dynamic performance of magnetic reactance-type voltage regulation according to claim 1, characterized in that, The process of generating a comprehensive dynamic performance score and a dynamic performance evaluation result based on the dynamic response index and the harmonic suppression index includes: The dynamic response index and the harmonic suppression index are normalized to obtain a set of normalized indices. The normalized index set is weighted and calculated based on preset weighting coefficients to generate the comprehensive dynamic performance score. The dynamic performance evaluation results of the magnetic reactive voltage stabilization system are generated based on the comprehensive dynamic performance score and preset judgment conditions.

10. A dynamic performance evaluation system for magnetic reactance-based voltage regulation, characterized in that, The system includes: The data acquisition module is used to acquire synchronous data during the operation of the magnetic reactance voltage regulator. The timing module is used to determine the time of disturbance occurrence and the time of stability based on the synchronously acquired data, and to extract evaluation data segments based on the time of disturbance occurrence and the time of stability. The response calculation module is used to calculate the voltage recovery time, voltage regulation accuracy, and overshoot based on the evaluation data segment to obtain dynamic response indicators. The harmonic analysis module is used to perform frequency domain analysis on the evaluation data segment, calculate the total harmonic distortion rate improvement rate and the suppression ratio of each harmonic based on the frequency domain analysis results, and obtain the harmonic suppression index. The scoring module is used to generate a comprehensive dynamic performance score based on the dynamic response index and the harmonic suppression index, and then generate the dynamic performance evaluation result of the magnetic reactive voltage regulator.

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