Thyristor commutation switching-off control method and system based on harmonic interference adaptive regulation and control

Abstract

The invention provides a thyristor commutation turn-off control method and system based on harmonic interference self-adaptive regulation and control, and relates to the technical field of data processing.The method comprises the steps that the current operation state of a thyristor is detected, initial data related to turn-off of the thyristor is obtained, and an original turn-off data set is formed; calculating an expected commutation voltage value according to the original turn-off data set, and generating a commutation trigger signal in combination with an external harmonic interference parameter; adjusting an inductance value and a capacitance value in a commutation loop according to the commutation trigger signal; when the commutation operation is executed, the change trend of the anode-cathode voltage of the thyristor is monitored in real time, and the inductance value of the commutation loop is finely adjusted according to the change trend; when the change trend of the anode-cathode voltage of the thyristor rises rapidly and is stable, the turn-off is completed; dynamic parameter data in the turn-off process are collected and stored, and a thyristor turn-off report is generated; according to the invention, the autonomy and accuracy of the turn-off of the thyristor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and particularly to a thyristor commutation turn-off control method and system based on harmonic interference adaptive regulation. Background Art

[0002] A thyristor is a semiconductor device widely used in power electronic devices, mainly used to control the conduction and turn-off of current. In the prior art, the turn-off of a thyristor is usually achieved by externally applying a negative voltage or reducing the forward current. For example, in a high voltage direct current (HVDC) transmission system, a forced commutation method is used to switch the thyristor from the conduction state to the turn-off state. The specific implementation process usually includes passing through an additional commutation circuit to reverse the voltage across the thyristor to a negative voltage to consume the charge and achieve the turn-off purpose. However, to ensure complete turn-off of the thyristor, the parameter design requirements of the commutation circuit are very strict, including the matching of inductance and capacitance and their dynamic regulation.

[0003] However, the existing thyristor turn-off methods may face serious adaptability problems in a rapidly changing power grid environment. For example, in a scenario with rich harmonics or frequent power grid fluctuations, the parameters of the commutation circuit may not be adjusted in real time, resulting in the thyristor being unable to turn off reliably and even possibly misfiring. In this case, the stability of the power grid will be threatened, and equipment damage or system collapse may be caused. This defect is particularly obvious in high-frequency power conversion devices in the industrial field, because they need to frequently turn off thyristors to achieve fast power regulation, and the prior art is difficult to meet their high reliability requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a thyristor commutation turn-off control method and system based on harmonic interference adaptive regulation, aiming to solve the problems mentioned in the background art.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows:

[0006] In a first aspect, a thyristor commutation turn-off control method based on harmonic interference adaptive regulation, the method includes:

[0007] By detecting the current operating state of the thyristor, initial data related to the turn-off of the thyristor is obtained, including current value, forward voltage value, and external harmonic interference data, to form an original turn-off data set;

[0008] According to the original turn-off data set, the expected commutation voltage value is calculated, and combined with the external harmonic interference parameters, a commutation trigger signal is generated, and the commutation trigger signal is used to drive the commutation circuit to perform a commutation operation;

[0009] Adjust the inductance value and capacitance value in the commutation circuit according to the commutation trigger signal, so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value, and generate commutation circuit dynamic adjustment data;

[0010] During the commutation operation, monitor the change trend of the anode-cathode voltage of the thyristor in real time, and fine-tune the inductance value of the commutation circuit according to the change trend to generate commutation circuit parameter data;

[0011] When the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable, generate a turn-off completion signal;

[0012] Collect and store the dynamic parameter data of the turn-off process to form a turn-off data set;

[0013] Generate a thyristor turn-off report according to the turn-off data set, including the operating parameters of each stage during the turn-off process of the thyristor and the commutation circuit parameters.

[0014] Preferably, the initial data related to the thyristor turn-off is obtained by detecting the current operating state of the thyristor, including the current value, the forward voltage value, and the external harmonic interference parameter, and form an original turn-off data set, including:

[0015] Collect the real-time signals of the thyristor input current and voltage to generate input signal data;

[0016] Preprocess the input signal data, including denoising, filtering, and normalization processing, to generate clean signal data;

[0017] According to the clean signal data, perform frequency-domain analysis using the fast Fourier transform, extract the harmonic frequency components other than the fundamental wave and their amplitude characteristics, and generate harmonic component data;

[0018] According to the spectral characteristics of the harmonic component data, extract the key harmonic components by means of segmented sampling, and perform frequency-domain weighted processing on the key harmonic components to generate external harmonic interference data;

[0019] Combine the external harmonic interference data, the real-time current value data and the forward voltage value data of the thyristor to generate an original turn-off data set.

[0020] Preferably, the expected commutation voltage value is calculated according to the current value and the forward voltage value in the original turn-off data set, and combined with the external harmonic interference parameter to generate a commutation trigger signal, including:

[0021] Calculate the expected commutation voltage value according to the current value, the forward voltage value and the external harmonic interference data in the original turn-off data set to generate expected commutation voltage data; where, , is the expected commutation voltage, For the instantaneous current of the thyristor at time , for the forward voltage of the thyristor, for the reference voltage, for the adjustment coefficient, for the interference intensity of the nth harmonic component, for the weight coefficient of the nth harmonic component, for the adjustment coefficient of the nth harmonic component, is the highest order of harmonic calculation;

[0022] According to the external harmonic interference data, calculate the commutation time window parameters and generate commutation time window data; wherein, , is the commutation time window, is the basic commutation time window, is the adjustment coefficient;

[0023] Jointly analyze the expected commutation voltage data and the commutation time window data, and calculate the trigger time according to the timing requirements of the commutation time window and the expected commutation voltage value to generate a preliminary commutation trigger signal;

[0024] According to the electrical characteristics of the commutation circuit, perform signal shaping on the preliminary commutation trigger signal to generate a commutation trigger signal.

[0025] Preferably, the calculation formula for the trigger time is: , is the commutation trigger time, is the shortest trigger time, and are adjustment coefficients.

[0026] Preferably, adjust the inductance value and capacitance value in the commutation circuit so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value, and generate commutation circuit dynamic adjustment data, including:

[0027] Receive the commutation trigger signal and collect the initial inductance parameter and initial capacitance parameter of the current commutation circuit to generate commutation circuit initial parameter data;

[0028] According to the expected commutation voltage data and the commutation time window data, gradually optimize and adjust the inductance parameter of the commutation circuit to generate optimized inductance parameter data; wherein, , is the optimized inductance value after the first iteration, is the optimized inductance value after the -th iteration, is the optimization step size, is the reference inductance value, is the objective function of inductance optimization with respect to the optimized inductance partial derivative; where , where is the usage time of the -th iteration, is the commutation voltage after the -th iteration, , and are weight coefficients;

[0029] According to the optimized inductance parameter data, dynamically configure the capacitance parameters of the commutation loop to generate dynamic capacitance parameter data; where , where is the dynamic capacitance value, is the initial capacitance, is the final optimized inductance value, is the weight coefficient, is the reference time, is the adjustment coefficient, is the small adjustment term;

[0030] According to the initial parameter data of the commutation loop, the optimized inductance parameter data and the dynamic capacitance parameter data, generate the dynamic adjustment data of the commutation loop, including the inductance adjustment value and the capacitance adjustment value.

[0031] Preferably, when performing the commutation operation, the change trend of the anode-cathode voltage of the thyristor is monitored in real time, and the inductance value of the commutation loop is finely adjusted according to the change trend to generate the commutation loop parameter data, including:

[0032] By collecting the anode-cathode voltage state of the thyristor in real time, extracting the anode-cathode voltage characteristics, and generating the anode-cathode voltage curve data;

[0033] According to the anode-cathode voltage curve data, calculate the voltage rise rate and the fluctuation amplitude to generate the voltage change rate characteristic data;

[0034] Compare the voltage change rate characteristic data with the preset turn-off determination threshold to obtain the comparison result;

[0035] When the comparison result does not meet the requirements of the preset turn-off determination threshold, according to the voltage change rate characteristic data, finely adjust the inductance parameter and the capacitance parameter of the commutation loop in sequence to generate the commutation loop parameter data.

[0036] Preferably, the commutation circuit parameter data includes fine-tuning inductor parameters and fine-tuning capacitor parameters, and their calculation formulas are respectively: , where is the fine-tuning inductor value, and are adjustment coefficients, is the instantaneous change rate of the anode-cathode voltage; , where is the fine-tuning capacitor value, , and are adjustment coefficients, is the amplitude of the anode-cathode voltage fluctuation.

[0037] In a second aspect, a thyristor commutation turn-off control system based on harmonic interference adaptive regulation, the system includes:

[0038] A data collection module, configured to obtain initial data related to thyristor turn-off by detecting the current operating state of the thyristor, including current value, forward voltage value, and external harmonic interference data, and form an original turn-off data set;

[0039] A trigger signal generation module, configured to calculate an expected commutation voltage value according to the original turn-off data set, and generate a commutation trigger signal in combination with external harmonic interference parameters, where the commutation trigger signal is used to drive the commutation circuit to perform a commutation operation;

[0040] A loop dynamic adjustment module, configured to adjust the inductor value and capacitor value in the commutation circuit according to the commutation trigger signal, so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value, and generate commutation circuit dynamic adjustment data;

[0041] A loop fine-tuning module, configured to, when performing a commutation operation, monitor the change trend of the anode-cathode voltage of the thyristor in real time, and fine-tune the inductor value of the commutation circuit according to the change trend, and generate commutation circuit parameter data;

[0042] A turn-off signal generation module, configured to generate a turn-off completion signal when the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable;

[0043] A turn-off process monitoring module, configured to collect and store the dynamic parameter data of the turn-off process, and form a turn-off data set;

[0044] A report generation module, configured to generate a thyristor turn-off report according to the turn-off data set, including the operating parameters of each stage of the thyristor during the turn-off process and the commutation circuit parameters.

[0045] The above solution of the present invention has at least the following beneficial effects:

[0046] During the operation of a power electronic device, the reliable turn-off of thyristors is crucial for the stability and safety of the system. Existing technologies usually rely on commutation circuits with fixed parameters for forced commutation to switch thyristors from the conducting state to the off state. However, in practical applications, the power grid environment may be affected by factors such as harmonic interference and voltage fluctuations, resulting in the inability to adjust the parameters of the commutation circuit in real time, thereby affecting the commutation success rate of thyristors. Especially in high-frequency power conversion systems or scenarios with frequent power grid fluctuations, fixed-parameter commutation circuits are difficult to adapt to the rapid changes in power grid conditions, which may cause problems such as commutation failure, mis-triggering, or incomplete turn-off of thyristors, thus affecting the reliability of the entire system.

[0047] Compared with the existing technology, this solution improves the adaptability and reliability of commutation by real-time monitoring the operating state of thyristors and combining external harmonic interference data. First, by obtaining the current value, forward voltage value of the thyristor, and external harmonic interference data, an original turn-off data set is formed, and the expected commutation voltage value is calculated based on this data set. Traditional commutation methods usually rely on fixed commutation voltages, while this solution enables the commutation voltage to be adaptively adjusted by combining external harmonic interference data, thereby improving the commutation accuracy and avoiding commutation failure problems caused by harmonic interference.

[0048] Secondly, this solution adopts a method of dynamically calculating the commutation trigger signal to ensure that the voltage waveform of the commutation circuit is consistent with the expected commutation voltage. The generation of the commutation trigger signal is based on the expected commutation voltage calculated from the current operating data and external harmonic interference data, ensuring that the commutation process meets the requirements of the current power grid environment without being restricted by fixed-parameter commutation circuits. In addition, during the commutation execution process, the inductance value and capacitance value of the commutation circuit can be adjusted according to the commutation trigger signal to make the commutation voltage curve smoother, thereby avoiding problems such as voltage overshoot or oscillation during commutation and improving the stability of commutation.

[0049] In addition, to further ensure the accuracy of commutation, during the commutation execution process, this solution monitors the changing trend of the anode-cathode voltage of the thyristor in real time, and micro-adjusts the inductance value of the commutation circuit based on the voltage changing trend to make the commutation process adapt to the current power grid environment. When the anode-cathode voltage of the thyristor rises rapidly and remains stable, the system generates a turn-off completion signal, indicating the successful completion of the commutation process. This commutation determination method based on the changing trend of the anode-cathode voltage improves the commutation accuracy and avoids misjudgment caused by mismatched commutation parameters. In addition, this solution also stores the dynamic data during the turn-off process and generates a thyristor turn-off report based on the stored data, enabling the system to perform subsequent optimization and adjustment to adapt to different application scenarios and improve the intelligence level of thyristor commutation control.

[0050] Compared with the traditional thyristor commutation method, this solution effectively improves the reliability and adaptability of thyristor commutation through intelligent commutation trigger signal calculation, adaptive commutation circuit parameter adjustment, real-time voltage monitoring, and dynamic data storage. Especially in scenarios with severe harmonic interference and frequent power grid fluctuations, it can significantly reduce the risk of commutation failure. This method can be applied to various application scenarios such as DC power transmission, high-frequency power conversion, and power grid regulation, ensuring the stable operation of the system, reducing equipment damage or system collapse caused by commutation failure, and improving the safety and reliability of the overall system. Brief Description of the Drawings

[0051] Figure 1 It is a flowchart of a thyristor commutation turn-off control method based on harmonic interference adaptive regulation provided by an embodiment of the present invention. Detailed Embodiments

[0052] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0053] As Figure 1 shown, an embodiment of the present invention proposes a thyristor commutation turn-off control method based on harmonic interference adaptive regulation, and the method includes:

[0054] S100. By detecting the current operating state of the thyristor, obtain initial data related to the thyristor turn-off, including current value, forward voltage value, and external harmonic interference data, and form an original turn-off data set;

[0055] S200. Calculate the expected commutation voltage value based on the original turn-off data set, and generate a commutation trigger signal in combination with external harmonic interference parameters. The commutation trigger signal is used to drive the commutation circuit to perform a commutation operation;

[0056] S300. Adjust the inductance value and capacitance value in the commutation circuit according to the commutation trigger signal, so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value, and generate commutation circuit dynamic adjustment data;

[0057] S400. During the commutation operation, monitor the change trend of the anode-cathode voltage of the thyristor in real time, and fine-tune the inductance value of the commutation circuit according to the change trend to generate commutation circuit parameter data;

[0058] S500. When the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable, generate a turn-off completion signal;

[0059] S600. Collect and store the dynamic parameter data of the turn-off process to form a turn-off data set;

[0060] S700. Generate a thyristor turn-off report according to the turn-off data set. The thyristor turn-off report includes the operating parameters of each stage during the turn-off process of the thyristor and the dynamically adjusted commutation circuit parameters.

[0061] In the embodiment of the present invention, by obtaining the current operating state data, calculating the expected commutation voltage, and adjusting the commutation circuit parameters in real time, the initial data related to the thyristor turn-off can be obtained by detecting the current operating state of the thyristor, including the current value, the forward voltage value, and the external harmonic interference data, to form an original turn-off data set. Based on this data set, the expected commutation voltage value is calculated, and a commutation trigger signal is generated in combination with the external harmonic interference parameters. The commutation trigger signal is used to drive the commutation circuit to perform a commutation operation, so that the commutation voltage matches the expected commutation voltage value. During the commutation operation, the change trend of the anode-cathode voltage of the thyristor is monitored in real time, and the inductance value of the commutation circuit is fine-tuned according to the change trend to ensure the stability of the commutation process. When the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable, a turn-off completion signal is generated, indicating the completion of the thyristor turn-off operation. At the same time, the dynamic parameter data of the turn-off process is collected and stored to form a complete data set of the commutation process, and a turn-off report is generated based on this data, including the operating parameters of each stage during the turn-off process of the thyristor and the commutation circuit parameters.

[0062] During the turn-off process, the real-time acquisition and calculation of various operating parameters can effectively improve the accuracy of the commutation process. The generation of the commutation trigger signal is based on the expected commutation voltage and external harmonic interference data, enabling the commutation circuit to adapt to different commutation conditions and ensuring the accuracy of the commutation voltage. Compared with traditional commutation methods, the dynamic adjustment of the commutation circuit improves the matching degree of the commutation voltage and avoids the problem of commutation failure caused by fixed commutation circuit parameters. The inductance and capacitance values of the commutation circuit are adjusted in real time according to the commutation trigger signal, making the commutation voltage waveform conform to the expected commutation voltage characteristics, thereby increasing the success rate of commutation. During the execution of commutation, the real-time monitoring of the anode-cathode voltage of the thyristor enables the voltage fluctuations that occur during commutation to be quickly identified, and on this basis, the commutation circuit parameters are further finely adjusted to make the commutation process more stable. After commutation is completed, the dynamic parameter data of the turn-off process is stored and a turn-off report is formed. This report can be used for the optimization of subsequent commutation parameters and provides data support for the improvement of the commutation process. The above process enhances the adaptability of thyristor commutation, enabling it to operate stably in different electromagnetic environments.

[0063] Among them, when the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable, a turn-off completion signal is generated. Specifically:

[0064] The change trend of the anode-cathode voltage can intuitively reflect the voltage adjustment effect during the commutation process. During the commutation process of the thyristor, the anode-cathode voltage usually undergoes the following change process:

[0065] After the commutation trigger signal is sent, the commutation voltage of the commutation circuit acts on the thyristor, causing the anode-cathode voltage to gradually decrease.

[0066] When the commutation process is approaching completion, the anode-cathode voltage begins to rise rapidly and tends to be stable.

[0067] If the voltage changes slowly or oscillates during the commutation process, it may indicate that there is still residual charge inside the thyristor and the commutation process is not yet complete.

[0068] In order to accurately judge whether the commutation process is stable, the real-time data of the anode-cathode voltage needs to be collected and its change trend analyzed. During the data collection process, the voltage value at each moment of the anode-cathode voltage is continuously recorded to form a curve of voltage changing with time. The characteristics of this curve mainly include:

[0069] The voltage rising rate, that is, the change amplitude of the voltage per unit time;

[0070] The voltage fluctuation amplitude, that is, whether the voltage fluctuates violently in a short time;

[0071] The voltage stability, that is, whether the voltage remains stable after reaching a certain level.

[0072] If the rate of voltage change is low or there are large fluctuations, it indicates that there may be deviations in the inductance value or capacitance value of the commutation circuit, and further fine-tuning is required to ensure that the commutation process meets expectations.

[0073] When the parameters of the commutation circuit are adjusted so that the anode-cathode voltage change trend meets the following conditions, the thyristor can be determined to be successfully turned off:

[0074] The anode-cathode voltage rises rapidly, indicating that the commutation of the thyristor is basically completed;

[0075] The voltage remains stable after rising, indicating that the thyristor is no longer conducting and there is no residual charge.

[0076] When the above conditions are met, the commutation system generates a turn-off completion signal to mark the end of the commutation process. The turn-off completion signal is not only used to notify the system that the commutation has been successfully completed, but also can trigger other related control logics, such as:

[0077] Close the commutation circuit and restore it to its initial state to prepare for the next commutation;

[0078] Record the time when the commutation is completed to provide data support for analyzing the success rate of the commutation process;

[0079] Interact with other power equipment to ensure the coordination of the commutation process of the entire power system.

[0080] In special cases, if the voltage fluctuation during the commutation process is still large, the commutation system will not generate a turn-off completion signal, but continue to adjust the parameters of the commutation circuit until the commutation process is completely stable.

[0081] Among them, the dynamic parameter data of the turn-off process is collected and stored to form a turn-off data set. Specifically:

[0082] The dynamic changes of multiple key parameters are involved in the commutation process, including:

[0083] The time point of the commutation trigger signal;

[0084] The adjustment process of the inductance value and capacitance value of the commutation circuit;

[0085] The change curve of the anode-cathode voltage;

[0086] The generation moment of the turn-off completion signal.

[0087] To improve the reliability of commutation control, this data needs to be stored for subsequent analysis and optimization of the commutation process. During data storage, the commutation system records the key parameters during the commutation process and organizes them into a commutation data set in chronological order. The storage method of this data set can adopt circular buffer storage or database storage for subsequent calling and analysis.

[0088] Among them, according to the turn-off data set, a thyristor turn-off report is generated. The thyristor turn-off report includes the operating parameters of each stage during the turn-off process of the thyristor and the commutation circuit parameters adjusted dynamically. Specifically:

[0089] This report contains the operating parameters of each stage during the commutation process and the commutation circuit parameters. The content of the turn-off report usually includes:

[0090] Commutation start data: The time of the commutation trigger signal, and the initial values of current and voltage.

[0091] Commutation process data: The process of adjusting the commutation circuit parameters, including the change of inductance value and capacitance value.

[0092] Voltage change trend: The curve of anode-cathode voltage changing with time, including data such as voltage rise rate and voltage fluctuation amplitude.

[0093] Commutation success determination data: The time of generating the turn-off completion signal, and the statistical data of whether the commutation is successful.

[0094] The generation of the turn-off report can provide data support for the optimization of the commutation process. In subsequent commutation processes, the commutation parameters can be optimized by referring to past commutation data to improve the commutation success rate. In addition, the long-term storage and analysis of commutation data can also be used for the health monitoring of equipment. By analyzing the change of the commutation characteristics of thyristors, potential faults of thyristors can be judged in advance, and the operation reliability of the equipment can be improved.

[0095] In a preferred embodiment of the present invention, the initial data related to the thyristor turn-off is obtained by detecting the current operating state of the thyristor, including the current value, forward voltage value, and external harmonic interference parameters, and a raw turn-off data set is formed, including:

[0096] Collect the real-time signals of the thyristor input current and voltage to generate input signal data;

[0097] Preprocess the input signal data, including denoising, filtering, and normalization processing, to generate clean signal data;

[0098] According to the clean signal data, perform frequency domain analysis using fast Fourier transform, extract the harmonic frequency components other than the fundamental wave and their amplitude characteristics, and generate harmonic component data;

[0099] According to the spectral characteristics of the harmonic component data, a segmented sampling method is used to extract key harmonic components, and the key harmonic components are weighted in the frequency domain to generate external harmonic interference data;

[0100] The external harmonic interference data, the real-time current value data and the forward voltage value data of the thyristor are combined to generate an original turn-off data set.

[0101] In the embodiment of the present invention, by collecting the input current, forward voltage and external harmonic interference data of the thyristor, an original turn-off data set can be formed. The accuracy of the original turn-off data has an important impact on the generation of the commutation trigger signal. The collected input signal data is preprocessed, including denoising, filtering and normalization processing, so that the input data can exclude environmental interference and improve the stability of the signal. On the basis of data processing, the fast Fourier transform is used to perform frequency domain analysis on the signal, extract the harmonic frequency components and their amplitude characteristics other than the fundamental wave, and generate harmonic component data. The calculation of the harmonic component data enables the impact of external harmonic interference on the commutation process to be quantified, avoiding commutation failure caused by harmonic interference.

[0102] Based on the spectral characteristics of the harmonic component data, a segmented sampling method is used to extract key harmonic components, and the key harmonic components are weighted in the frequency domain to generate external harmonic interference data. The segmented sampling method can ensure the effective suppression of harmonic interference during the commutation process and optimize the calculation accuracy of the commutation parameters. The external harmonic interference data, the real-time current value data and the forward voltage value data of the thyristor are combined to form a complete original turn-off data set, providing data support for the calculation of the commutation parameters. Compared with the commutation method based on time-domain signals, the harmonic processing method based on frequency domain analysis can more accurately identify the impact of harmonic interference, make the calculation of the commutation trigger signal more accurate, and improve the anti-interference ability of the commutation process.

[0103] In one case of this embodiment, for the part of using the fast Fourier transform to perform frequency domain analysis on the clean signal data, extracting the harmonic frequency components and their amplitude characteristics other than the fundamental wave, and generating harmonic component data, the core is to process the current signal or voltage signal input to the thyristor, extract the harmonic characteristic information other than the fundamental wave, and use it for subsequent analysis and optimization. Specifically, it includes:

[0104] Obtaining clean signal data: Clean signal data is usually obtained through signal acquisition devices such as current sensors and voltage sensors. During the signal acquisition process, preliminary filtering and denoising processing are required to remove the random noise that may exist in the system, ensuring the stability and reliability of the signal.

[0105] Applications of Fast Fourier Transform: Perform Fast Fourier Transform (FFT) analysis on clean signal data to convert time-domain signals into frequency-domain signals. Through FFT, the input signal can be decomposed into multiple frequency components, and the frequency, amplitude, and phase information of each component can be obtained. Among them, the fundamental component corresponds to the main frequency of the signal, and the remaining frequency components are harmonic components, including high-frequency components introduced by nonlinear loads or interference in the power grid.

[0106] Extract harmonic components other than the fundamental: Eliminate the fundamental component from the frequency-domain signal and retain the data of all harmonic components, including their frequency and amplitude characteristics. These harmonic component data will be used to describe the strength of nonlinear characteristics or external harmonic interference in the power grid.

[0107] Generate harmonic component data: The harmonic component data includes detailed information of multiple frequency components, such as frequency values, corresponding amplitudes, and harmonic orders. These data can be recorded in a specific storage format for subsequent analysis.

[0108] In one case of this embodiment, according to the spectral characteristics of the harmonic component data, a segmented sampling method is adopted to extract key harmonic components, and frequency-domain weighting processing is performed on the key harmonic components to generate external harmonic interference data, specifically including:

[0109] Extract key harmonic components by segmented sampling: Harmonic component data usually contains multiple frequency components, and the intensities and influence degrees of different frequency components are different. By analyzing the harmonic spectral characteristics, it is possible to determine which frequency components have a significant impact on the system operation. Adopt a segmented sampling method to divide the harmonic spectrum into multiple frequency bands, and extract the key harmonic components that have the greatest impact on the dynamic characteristics of the system within each frequency band. This operation can significantly reduce the computational amount while retaining the most valuable information for the dynamic adjustment of the commutation loop.

[0110] Frequency-domain weighting processing of key harmonic components: Perform frequency-domain weighting processing on the extracted key harmonic components, and assign different weights according to the influence degrees of the harmonic components in each frequency band on the system. For example, low-frequency harmonics may have a greater impact on current distortion, while high-frequency harmonics may have a more significant impact on voltage fluctuations in the commutation loop. The weighted harmonic data can more accurately reflect the actual impact of harmonic interference.

[0111] Generate external harmonic interference data: Combine all the weighted key harmonic component data to generate external harmonic interference data. This data is used to describe the overall characteristics of power grid harmonic interference and provide a basis for the generation of commutation trigger signals and the dynamic adjustment of loop parameters.

[0112] In a preferred embodiment of the present invention, calculate the expected commutation voltage value according to the current value and forward voltage value in the original turn-off dataset, and combine external harmonic interference parameters to generate a commutation trigger signal, including:

[0113] Calculate the expected commutation voltage value based on the current value, forward voltage value, and external harmonic interference data in the original turn-off dataset, and generate the expected commutation voltage data; where, , where, is the expected commutation voltage, is the moment of the thyristor instantaneous current, is the forward voltage of the thyristor, is the reference voltage, is the adjustment coefficient, is the interference intensity of the nth harmonic component, is the weight coefficient of the nth harmonic component, is the adjustment coefficient of the nth harmonic component, is the highest order of harmonic calculation;

[0114] Calculate the commutation time window parameters based on the external harmonic interference data, and generate the commutation time window data; where, , is the commutation time window, is the basic commutation time window, is the adjustment coefficient;

[0115] Jointly analyze the expected commutation voltage data and the commutation time window data, and calculate the trigger time according to the timing requirements of the commutation time window and the expected commutation voltage value, and generate a preliminary commutation trigger signal;

[0116] The calculation formula for the trigger time is: , is the commutation trigger time, is the shortest trigger time, is the acquisition cycle time, and are adjustment coefficients;

[0117] According to the electrical characteristics of the commutation circuit, perform signal shaping processing on the preliminary commutation trigger signal to generate a commutation trigger signal.

[0118] In the embodiments of the present invention, the generation of the commutation trigger signal is based on the current value, the forward voltage value, and the external harmonic interference data in the original turn-off dataset. First, the expected commutation voltage is calculated using the original turn-off dataset to ensure the matching of the commutation voltage during the commutation process. The calculation of the expected commutation voltage enables the commutation characteristics of the commutation circuit to be accurately predicted, providing a basis for the generation of the commutation trigger signal. During the calculation of the commutation time window, the dynamic fluctuation characteristics of the external harmonic interference data are considered, enabling the commutation time window parameters to adapt to the timing requirements of the commutation process and ensuring that the commutation trigger signal is triggered at the correct time point.

[0119] After the joint analysis of the expected commutation voltage data and the commutation time window data, the trigger time is calculated according to the timing requirements of the commutation time window and the expected commutation voltage value, and a preliminary commutation trigger signal is generated. The calculation of the trigger time makes the time control of the commutation process more accurate, avoiding commutation failure caused by mismatched commutation times. After the commutation trigger signal is generated, based on the electrical characteristics of the commutation circuit, signal shaping processing is performed on the preliminary commutation trigger signal to ensure the stability of the commutation trigger signal, enabling the commutation trigger signal to accurately drive the commutation circuit to perform the commutation operation.

[0120] Compared with the traditional commutation method, the generation of the commutation trigger signal is calculated based on the expected commutation voltage and the commutation time window, enabling the commutation trigger signal to adapt to different commutation conditions and improving the success rate of commutation. During the calculation of the commutation trigger signal, the dynamic fluctuation characteristics of the external harmonic interference are considered, enabling the commutation time window to be dynamically adjusted according to the change of the harmonic environment, further optimizing the stability of the commutation process. The signal shaping processing of the commutation trigger signal improves the reliability of the commutation signal, ensuring that the commutation action of the commutation circuit can be accurately executed and improving the turn-off stability of the thyristor.

[0121] Among them, in , the expected commutation voltage is calculated from the operating state of the current thyristor and is mainly affected by the current , the forward voltage and the external harmonic interference .

[0122] Molecular part: The ratio of ensures that the influence of the forward voltage is correctly normalized, reflects the basic contributions of the current and voltage to the commutation voltage, where as a non-linear parameter enables the commutation voltage to be adaptively adjusted according to the voltage characteristics.

[0123] Denominator part: reflects the influence of the harmonic interference, controls the weights of different order harmonics on the commutation voltage, Amplify or reduce the influence of high-order harmonics according to the set rules.

[0124] The calculation formula of the expected commutation voltage can adapt to different thyristor operating states, making the commutation voltage calculation more accurate. The numerator part is based on the relationship between the current and the forward voltage, ensuring that the commutation voltage matches the actual working state. The denominator part takes into account the influence of harmonic interference and can dynamically correct the commutation voltage to avoid the instability problem of the commutation voltage caused by harmonics. Compared with the traditional commutation voltage calculation method, this method can combine the harmonic influence of the external environment to make the commutation voltage more stable and improve the commutation success rate. By adjusting parameters such as , and , this calculation formula can adapt to different power environments and improve the adaptability of commutation.

[0125] Example scenario:

[0126] In a high-voltage direct current transmission system, when a certain thyristor commutates, the input current is 500 A and the forward voltage is 400 V, but it is affected by 5% harmonic interference. If harmonic interference is not considered, the calculated value of the commutation voltage may be too high, resulting in commutation failure. This calculation formula can automatically adjust the commutation voltage to accurately predict the commutation voltage under harmonic interference.

[0127] When the harmonic influence is small (e.g., 1%), the commutation voltage is only slightly adjusted to maintain the commutation accuracy.

[0128] When the harmonic influence is large (e.g., 10%), the commutation voltage is appropriately reduced to avoid commutation failure caused by excessive harmonics and improve the stability of commutation.

[0129] Ensure that the commutation process is controllable, avoid commutation failure caused by misjudgment of voltage, and improve the adaptability of commutation.

[0130] Among them, in , the commutation time window is calculated based on the basic commutation time and the harmonic interference , and the commutation time window is dynamically adjusted by calculating the harmonic influence amount.

[0131] The basic commutation time window : represents the commutation time in the ideal state, that is, the time required for the commutation process without being affected by harmonics.

[0132] The correction term : is used to adjust the commutation time window to adapt to the external harmonic interference environment.

[0133] The commutation time window can be dynamically adjusted according to the changes in external harmonic interference through a calculation formula, making the commutation process more accurate. Compared with the commutation method with a fixed time window, this method can adaptively adjust to the harmonic environment and improve the stability of the commutation process. When the harmonic interference is large, the commutation time window is appropriately increased to ensure that the thyristor has enough time to complete commutation; when the harmonics are small, the commutation time window tends to , ensuring the commutation speed. The calculation formula can be adjusted by , and to adapt to different power grid environments and improve the robustness of the commutation process. Combining with the calculation of the commutation voltage, this method ensures that the commutation trigger signal can be triggered within the optimal time window, improving the commutation efficiency and success rate.

[0134] Example scenario:

[0135] In a certain converter station, the commutation time window is set to 5 ms. During a certain operation, the external harmonics suddenly increase. If the fixed commutation time window is still used, it may cause the commutation to advance or delay, affecting the normal operation of the thyristor. This calculation formula can dynamically adjust the commutation time window to adapt to the current harmonic environment.

[0136] If the harmonics are small (such as 1%), it is close to the default value of 5 ms, maintaining the commutation speed.

[0137] If the harmonics are large (such as 8%), it is appropriately extended to 5.4 ms to ensure that the commutation process is not disturbed and improve the commutation reliability.

[0138] Adaptive adjustment of the commutation time window ensures a stable commutation process and improves the commutation success rate.

[0139] Among them, in , the trigger time is calculated based on the basic system sampling time , the commutation time window and the expected commutation voltage , and is adjusted in combination with the harmonic influence.

[0140] Basic sampling time : Ensure the minimum trigger delay so that the commutation trigger signal can be executed within a reasonable time range.

[0141] Commutation time window : Used to adjust the range of the trigger time to ensure the adaptive adjustment of the commutation time window during the commutation process.

[0142] Correction term : The ratio ensures that the influence of the commutation voltage is correctly normalized; and controls the influence of the commutation voltage on the triggering time.

[0143] Harmonic correction term : Adjust the triggering time through harmonic data to ensure that the commutation process can adapt to different electromagnetic interference environments.

[0144] The calculation of the triggering time is based on the commutation time window and the commutation voltage, making the execution time of the commutation trigger signal more accurate. The calculation formula can be adaptively adjusted according to the actual operating state of the thyristor to ensure that the commutation process will not fail due to mismatched triggering times. The correction term for harmonic interference improves the stability of the commutation trigger signal and reduces the interference of harmonics on the commutation process. Combining the calculation of the commutation voltage and the commutation time window, the calculation of the triggering time ensures that the commutation process has stronger adaptability, improving the reliability and efficiency of commutation. The adjustment term for the triggering time enables the commutation trigger signal to be triggered at the optimal moment, reducing commutation delay and improving the response speed of the commutation circuit.

[0145] Example scenario:

[0146] At a certain converter station, the basic triggering time is set to 2 ms, and the commutation time window is 5 ms. Under high load conditions, the commutation voltage becomes lower. If a fixed triggering time is still used, commutation failure may occur. This calculation formula can adjust the triggering time according to the current commutation voltage and harmonic influence to ensure a stable commutation process.

[0147] If the commutation voltage is high, the triggering time is short to ensure fast commutation and improve commutation efficiency.

[0148] If the commutation voltage is low, the triggering time is appropriately extended to improve commutation stability and avoid commutation failure.

[0149] The triggering time matches the commutation environment, reducing the probability of commutation failure and improving commutation accuracy.

[0150] In one case of this embodiment, performing signal shaping processing on the preliminary commutation trigger signal according to the electrical characteristics of the commutation loop to generate a commutation trigger signal specifically includes:

[0151] Analysis of the electrical characteristics of the commutation loop: The electrical characteristics of the commutation loop include inductance value, capacitance value, load characteristics, and dynamic voltage recovery characteristics. These parameters determine the rate of change of voltage and current waveforms in the commutation loop. Signal shaping processing needs to combine these characteristics to ensure that the generated commutation trigger signal matches the dynamic characteristics of the commutation loop.

[0152] Optimization of the preliminary commutation trigger signal: The preliminary trigger signal may have problems such as delay, waveform distortion, or insufficient amplitude. Through signal shaping processing, the amplitude, waveform, and timing of the preliminary trigger signal can be optimized. The process of signal shaping usually includes operations such as filtering, gain adjustment, and pulse width modulation to generate a more accurate commutation trigger signal.

[0153] Generating the commutation trigger signal: After signal shaping processing, the generated commutation trigger signal can meet the dynamic characteristic requirements of the commutation circuit and ensure the reliability of the commutation operation. The output of the commutation trigger signal is the key to driving the operation of the commutation circuit and directly determines whether the thyristor can complete the turn-off operation.

[0154] In a preferred embodiment of the present invention, adjusting the inductance value and capacitance value in the commutation circuit according to the commutation trigger signal to make the voltage waveform generated by the commutation circuit match the expected commutation voltage value and generating commutation circuit dynamic adjustment data includes:

[0155] Collecting the initial inductance parameter and initial capacitance parameter of the current commutation circuit according to the commutation trigger signal to generate commutation circuit initial parameter data;

[0156] Gradually optimizing and adjusting the inductance parameter of the commutation circuit according to the commutation time window data to generate optimized inductance parameter data; where, , is the optimized inductance value after the 1st iteration, is the optimized inductance value after the th iteration, is the optimization step size, is the reference inductance value, is the inductance optimization objective function with respect to the optimized inductance partial derivative; where, , where, is the usage time of the th iteration, is the commutation voltage after the th iteration, , and are weight coefficients;

[0157] Dynamically configuring the capacitance parameter of the commutation circuit according to the optimized inductance parameter data to generate dynamic capacitance parameter data; where, , where, is the dynamic capacitance value, is the initial capacitance, is the final optimized inductance value, is the weight coefficient, is the reference time, is the adjustment coefficient, is the small adjustment term;

[0158] According to the initial parameter data of the commutation circuit, the optimized inductance parameter data, and the dynamic capacitance parameter data, dynamic adjustment data of the commutation circuit are generated, including the inductance adjustment value and the capacitance adjustment value.

[0159] In the embodiment of the present invention, during the commutation process, the parameter adjustment of the commutation circuit has an important influence on the matching degree of the commutation voltage and the commutation success rate. Based on the commutation trigger signal, the inductance value and capacitance value in the commutation circuit are dynamically adjusted, so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value. The dynamic adjustment of the commutation circuit can effectively avoid commutation failure caused by fixed parameters of the commutation circuit and improve the stability of the commutation process.

[0160] After the commutation trigger signal is generated, the initial inductance parameter and the initial capacitance parameter of the commutation circuit are collected to form the initial parameter data of the commutation circuit. Based on the expected commutation voltage data and the commutation time window data, the inductance parameter of the commutation circuit is gradually optimized and adjusted, so that the inductance characteristics of the commutation circuit adapt to the commutation requirements. After the optimized inductance parameter data is generated, the capacitance parameter of the commutation circuit is dynamically configured according to the optimized inductance parameter to ensure the overall parameter coordination of the commutation circuit. The inductance adjustment value and the capacitance adjustment value of the commutation circuit are finally used for the dynamic adjustment of the commutation circuit, so that the commutation circuit maintains the best commutation electrical characteristics during the commutation process.

[0161] Compared with the traditional method of fixing the parameters of the commutation circuit, the dynamic adjustment method of the commutation circuit can perform adaptive optimization for different commutation conditions and improve the reliability of the commutation process. The acquisition of the initial parameters of the commutation circuit ensures that the current state of the commutation circuit can be accurately obtained, providing data support for subsequent parameter optimization. The gradual optimization and adjustment of the inductance parameter enable the commutation circuit to dynamically adapt to the change of the commutation voltage, improve the matching degree of the commutation voltage, and reduce the voltage deviation during the commutation process. The dynamic configuration of the capacitance parameter ensures the overall impedance matching of the commutation circuit and prevents unstable commutation caused by unreasonable configuration of the capacitance parameter during the commutation process. The dynamic adjustment data of the commutation circuit enables the adjustment parameters of the commutation circuit to be optimized in real time and can be adaptively adjusted based on the dynamic changes of the commutation process, further improving the success rate and stability of the commutation.

[0162] Among them, in this formula uses the gradient descent method to optimize and adjust the optimized inductance so that key parameters in the commutation process, such as the commutation time window, commutation voltage, etc., gradually converge to the optimal state.

[0163] : represents the optimized inductance value at the th iteration.

[0164] : represents the inductance optimization objective function with respect to the optimized inductance partial derivative, measuring the impact of the current inductance value on the commutation process.

[0165] : optimization step size, controlling the amplitude of inductance adjustment and determining the convergence speed.

[0166] This optimization formula is based on the gradient information of the inductance optimization objective function such that each iteration can adjust in the direction of the optimized inductance value to improve the stability of commutation. Through the gradient descent method, the optimization process can gradually converge, avoiding commutation failures caused by blindly adjusting inductance parameters. Appropriately selecting the optimization step size can balance the convergence speed and optimization accuracy, avoiding slow convergence or oscillation problems, and improving the efficiency of inductance adjustment. Through multiple iterations, the time window and commutation voltage of the commutation process gradually approach the optimal state, making the thyristor commutation more accurate and reliable. This formula ensures the adaptive adjustment of the inductance value during the commutation process, enhancing the adaptability of the commutation process and making it applicable to different electromagnetic environments.

[0167] Example scenario:

[0168] In a certain power conversion device, the inductance value of the commutation loop affects the decay rate of the commutation current. If the inductance is too large, the commutation time is too long, affecting the system efficiency; if the inductance is too small, the commutation is unstable. This calculation formula can optimize the inductance value through iteration to adapt to the current working environment.

[0169] Under low load conditions, the inductance value is optimized and adjusted to keep the commutation time stable.

[0170] Under high load conditions, the inductance value is appropriately reduced to increase the commutation speed and reduce energy losses.

[0171] The inductance value is automatically optimized to ensure the best performance of the commutation loop and improve commutation reliability.

[0172] Among them, in the inductance optimization objective function measures the impact of the current inductance value on the commutation process to ensure that the inductance adjustment can meet the commutation requirements.

[0173] The first part : Calculate the current commutation voltage and the commutation voltage of the previous iteration The error between them. Ensure that the commutation voltage is gradually optimized to converge to the optimal value.

[0174] The second part : Measure the current commutation time window and the commutation time window of the previous iteration for deviation. Optimize the inductor to make the commutation time window reach the optimal state.

[0175] The third part : Calculate the influence of external harmonic interference on the commutation process to ensure that the optimized inductor can effectively suppress the interference of harmonics on the commutation process.

[0176] This objective function calculates the errors of the commutation voltage and the commutation time window, enabling the optimization process to gradually adjust the inductor parameters to ensure the stability of the commutation process. By calculating the external harmonic interference, while optimizing the inductor, it reduces the influence of harmonics on the commutation circuit during the commutation process and improves the commutation success rate. The objective function adopts the form of squared error, which can avoid the influence of the error direction and make the optimization process more stable and reliable. The components of the objective function can be adjusted by the weight coefficients , and to adapt to different commutation requirements and improve the adaptability of the optimization method. This formula ensures that the optimization process can dynamically adjust the inductor parameters, enabling the thyristor commutation to adapt to different power grid environments and improving the overall commutation efficiency.

[0177] Example scenario:

[0178] During a certain commutation process, the currently calculated commutation voltage and the commutation time window deviate from the actual values. This objective function is used to evaluate the effect of inductor optimization, gradually optimizing the commutation voltage and time window.

[0179] Ensure that the commutation voltage approaches the optimal value and improve the commutation accuracy.

[0180] Ensure that the commutation time window matches the commutation conditions to avoid too long or too short commutation time.

[0181] Reduce the harmonic influence and improve the commutation stability.

[0182] Among them, in , the dynamic capacitance is calculated based on the commutation time window and the optimized inductor value to ensure that the capacitance parameters of the commutation process can adapt to the commutation requirements.

[0183] : The initial capacitance value, representing the default commutation capacitance value.

[0184] : Normalized commutation time window, which makes the calculation results not affected by the absolute values of different commutation times.

[0185] : Normalized optimized inductance, ensuring unit matching during calculation, and avoiding calculation instability caused by too large or too small inductance values.

[0186] : Adjustment coefficient, controlling the amplitude of capacitor adjustment.

[0187] This calculation formula is based on the commutation time window and the optimized inductance value to calculate the dynamic capacitor, enabling the capacitor in the commutation circuit to be dynamically adjusted to adapt to different commutation environments. Normalization processing and makes the calculation results more stable, avoiding excessive changes in capacitor values from affecting the commutation process. By adjusting and enables the capacitor adjustment to adapt to different commutation requirements, improving the adaptability of the commutation circuit. Compared with the commutation method with fixed capacitor parameters, this method can dynamically adjust the capacitor according to the change of the commutation time window, improving the commutation success rate. This formula ensures the matching of inductance and capacitance during the commutation process, improves the stability of the commutation circuit, and makes the thyristor turn-off more accurate and reliable.

[0188] Example scenario:

[0189] In a certain high-voltage DC commutation circuit, the capacitor parameters affect the commutation voltage waveform. If the capacitor is fixed, it cannot adapt to different load environments. This calculation formula can dynamically adjust the capacitor value to stabilize the commutation voltage.

[0190] In the case of light load, the capacitor value is appropriately reduced to improve the commutation speed.

[0191] In the case of heavy load, the capacitor value is appropriately increased to improve the commutation stability.

[0192] The commutation circuit adapts and adjusts itself to improve the commutation reliability.

[0193] In a preferred embodiment of the present invention, when performing the commutation operation, the change trend of the anode-cathode voltage of the thyristor is monitored in real time, and the inductance value of the commutation circuit is finely adjusted according to the change trend to generate commutation circuit parameter data, including:

[0194] By collecting the anode-cathode voltage state of the thyristor in real time, extracting the anode-cathode voltage characteristics, and generating anode-cathode voltage curve data;

[0195] According to the anode-cathode voltage curve data, calculate the voltage rise rate and the fluctuation amplitude, and generate the characteristic data of the voltage change rate;

[0196] Compare the characteristic data of the voltage change rate with a preset turn-off determination threshold to obtain a comparison result;

[0197] When the comparison result does not meet the requirements of the preset turn-off determination threshold, according to the characteristic data of the voltage change rate, fine-tune the inductance parameter and the capacitance parameter of the commutation circuit in sequence to generate the commutation circuit parameter data;

[0198] The commutation circuit parameter data includes a fine-tuned inductance parameter and a fine-tuned capacitance parameter, and their calculation formulas are respectively: , where is the fine-tuned inductance value, and are adjustment coefficients, is the instantaneous change rate of the anode-cathode voltage; , where is the fine-tuned capacitance value, , and are adjustment coefficients, is the fluctuation amplitude of the anode-cathode voltage.

[0199] In the embodiment of the present invention, during the commutation process, the change trend of the anode-cathode voltage can reflect the progress of the commutation. Based on the real-time monitoring of the anode-cathode voltage, the inductance value of the commutation circuit can be further fine-tuned to improve the stability of the commutation process. When performing the commutation operation, the parameter fine-tuning of the commutation circuit enables the commutation circuit to adapt to the change of the commutation voltage in real time, improving the reliability of the commutation.

[0200] During the commutation execution process, the anode-cathode voltage state of the thyristor is collected in real time, and the anode-cathode voltage characteristics are extracted to generate the anode-cathode voltage curve data. Based on the anode-cathode voltage curve data, calculate the voltage rise rate and the fluctuation amplitude, and extract the characteristic data of the voltage change rate. The characteristic data of the voltage change rate is used to judge the change trend of the voltage during the commutation process and is compared with a preset turn-off determination threshold to ensure the stability of the commutation process. When the comparison result does not meet the requirements of the preset turn-off determination threshold, the inductance parameter and the capacitance parameter of the commutation circuit are further fine-tuned so that the parameters of the commutation circuit can adapt to the real-time change of the commutation voltage. The fine-tuned commutation circuit parameter data can ensure that the commutation process remains stable under different voltage environments and improve the reliability of the commutation.

[0201] Compared with the method of only relying on commutation trigger signals for parameter adjustment, the fine-tuning of the commutation circuit parameters is based on the change trend of the anode-cathode voltage, which can dynamically optimize the commutation circuit parameters during the commutation process and improve the commutation accuracy. Real-time acquisition of the anode-cathode voltage status enables the commutation circuit to adapt to the real-time voltage changes during the commutation process and improve the matching degree of the commutation voltage. The calculation of the voltage change rate characteristic data enables the accurate identification of the voltage change trend during the commutation process, ensuring that the adjustment of the commutation circuit parameters is targeted. The fine-tuning of the commutation circuit parameters based on the voltage change rate makes the commutation process more stable, reduces commutation failures caused by voltage fluctuations, and improves the reliability of thyristor commutation.

[0202] Among them, by real-time acquiring the anode-cathode voltage status of the thyristor, extracting the anode-cathode voltage characteristics, and generating the anode-cathode voltage curve data, specifically:

[0203] During the commutation process, the anode-cathode voltage of the thyristor will undergo dynamic changes. To accurately judge the commutation process, it is necessary to real-time acquire the anode-cathode voltage and extract its change characteristics to determine whether the commutation is successfully completed.

[0204] During the acquisition process, the acquisition device of the anode-cathode voltage is connected to the electrodes of the thyristor and can record the changes of the anode-cathode voltage with high time resolution. The voltage acquisition device should meet the following conditions:

[0205] High sampling rate: During the commutation process, voltage changes may be completed in milliseconds or even microseconds. Therefore, the voltage acquisition system needs to have a sufficiently high sampling rate to capture the details of voltage changes.

[0206] Anti-interference ability: There may be harmonic interference or electromagnetic interference during the commutation process. Therefore, the acquisition system should adopt filtering and denoising techniques to ensure the accuracy of the data.

[0207] Continuous data storage: Voltage data needs to be stored in chronological order for subsequent change trend analysis.

[0208] After completing the data acquisition, it is necessary to extract the key characteristics of the anode-cathode voltage to analyze the status of the commutation process. The key characteristics include:

[0209] Voltage curve: That is, the complete trajectory of the anode-cathode voltage changing with time, which can intuitively reflect the commutation process.

[0210] Voltage change rate: During the commutation process, the voltage change rate of the anode-cathode voltage is an important indicator for judging the completion of commutation. When the voltage rises rapidly and tends to be stable, it indicates that the commutation is approaching completion.

[0211] Voltage fluctuation amplitude: If there is a significant voltage fluctuation during the commutation process, it may indicate that the parameters of the commutation circuit do not match or the thyristor is not fully turned off. Therefore, it is necessary to extract the voltage fluctuation amplitude to judge the stability of the commutation process.

[0212] By collecting and extracting the characteristics of the anode-cathode voltage, the complete information of the voltage change during the commutation process can be obtained, providing data support for judging the commutation completion status.

[0213] Among them, according to the anode-cathode voltage curve data, calculate the voltage rise rate and fluctuation amplitude to generate the voltage change rate characteristic data. Specifically:

[0214] After obtaining the change curve and its characteristic data of the anode-cathode voltage, it is necessary to further analyze the change trend of the voltage curve to judge whether the thyristor has been fully turned off.

[0215] Judging the voltage rise rate: During the commutation process, when the parameters of the inductance and capacitance in the commutation circuit are adjusted, the anode-cathode voltage should rise rapidly. If the voltage change rate is low, it indicates that the commutation process may not be completed and the thyristor is still in a partially conducting state.

[0216] In actual analysis, the rising amplitude of the anode-cathode voltage per unit time can be calculated and judged whether it meets the set rising rate threshold. If the voltage rise rate is lower than the threshold, the commutation process is still in progress; if the voltage rise rate reaches the set threshold, it indicates that the commutation process is approaching completion.

[0217] Judging the final stability of the voltage: After the commutation is completed, the anode-cathode voltage should remain stable without obvious fluctuations. If there are still periodic or non-periodic significant fluctuations in the voltage after the commutation is completed, it may indicate that there are still residual charges inside the thyristor and it has not fully entered the off state.

[0218] By calculating the fluctuation amplitude of the voltage change, it can be judged whether the commutation is stable. If the fluctuation amplitude exceeds the set threshold, the commutation process still needs to be adjusted; if the fluctuation amplitude is within the set range, it indicates that the commutation is completed.

[0219] Making a commutation completion determination based on the comprehensive voltage change trend: When the rising rate of the anode-cathode voltage reaches the set threshold and the voltage stability meets the set requirements, it can be determined that the thyristor commutation has been successfully completed.

[0220] The determination of the turn-off completion status not only depends on a single voltage value but also on the dynamic change trend of the voltage during the commutation process. Therefore, a complete voltage analysis of the entire commutation process is required to ensure the accuracy of the determination.

[0221] Through the above analysis, it is possible to accurately judge whether commutation is completed, and provide a reliable basis for the closing of the commutation trigger signal, improving the stability of the commutation process.

[0222] Among them, in , the fine-tuning inductor calculates based on the change in the anode-cathode voltage of the thyristor , and fine-tunes the inductor parameters during commutation through normalization processing, enabling the inductance value of the commutation loop to dynamically adapt to different commutation environments.

[0223] : represents the change amplitude of the anode-cathode voltage of the thyristor. Through normalization processing to make its value dimensionless in the calculation, ensuring calculation stability.

[0224] : the proportional coefficient controlling the fine-tuning amplitude, ensuring that the adjustment value will not be too large to cause instability in the commutation process.

[0225] : controls the influence degree of the voltage change amount on the inductor adjustment, determining the sensitivity of the inductor fine-tuning.

[0226] The denominator part : Through this term, it is ensured that when the voltage changes greatly, the fine-tuning amplitude is small, making the inductor adjustment stable and avoiding violent fluctuations. When the voltage change is small, this term approaches 1, making the fine-tuning effect stronger and improving the adaptability of the commutation loop to small voltage changes.

[0227] Fine-tune the inductor value through the change in the anode-cathode voltage, enabling the inductance value of the commutation loop to adapt to the voltage fluctuations during the commutation process in real time, improving commutation stability. Normalization processing makes the calculation dimensionless, ensuring that the inductor adjustment is not affected by different voltage levels, and improving the adaptability of the calculation formula. Through and control the fine-tuning amplitude, ensuring the stability of the inductor adjustment during commutation, and avoiding commutation failure caused by excessive adjustment of the inductor value. This formula can adaptively adjust the inductor value according to the dynamic change of the anode-cathode voltage during commutation, improving the anti-interference ability of the commutation process. Combined with the optimized inductor calculation, the fine-tuning inductor further optimizes the commutation loop parameters, making the thyristor commutation process more accurate and reliable.

[0228] Among them, in , the fine-tuning capacitor calculates based on the change in the anode-cathode voltage and the voltage characteristics of the commutation loop , the capacitance parameters during the commutation process are finely adjusted through normalization so that the capacitance value of the commutation loop can adapt to different commutation environments.

[0229] : Represents the voltage characteristics of the commutation loop, such as the average value or maximum value of the commutation voltage, and is used to adjust the calculation of the fine-tuning capacitor.

[0230] : The proportionality coefficient that controls the capacitance fine-tuning, preventing the adjustment amplitude from being too large or too small and affecting the commutation process.

[0231] and : Controls the adaptability of the capacitance fine-tuning to the voltage characteristics of the commutation loop, ensuring the rationality of the fine-tuning calculation at different voltage levels.

[0232] The numerator part : Enables the commutation loop to automatically increase the capacitance adjustment amplitude when the voltage changes greatly, improving the stability of the commutation loop.

[0233] The denominator part : Through the voltage characteristics of the commutation loop Carry out normalization processing to ensure the rationality of the calculation and avoid excessive capacitance adjustment.

[0234] Through the anode-cathode voltage change And the voltage characteristics of the commutation loop Calculate the fine-tuning capacitor , so that the capacitance value can dynamically adapt to the commutation process and improve the commutation stability. Normalization and Make the calculation dimensionless, improve the calculation adaptability, and ensure that the calculation formula is still valid at different voltage levels. Through the parameters 、 and Control the fine-tuning amplitude to prevent the capacitance adjustment amplitude from being too large or too small and affecting the commutation process. Combining with the dynamic capacitance Calculation, make the fine-tuning capacitor Can further optimize the parameters of the commutation loop and improve the overall adaptability of the commutation loop. This formula ensures that the capacitance value can adapt to different electromagnetic environments during the commutation process, making the thyristor commutation more stable and reliable and improving the commutation success rate.

[0235] Example scenario:

[0236] During the commutation process, when the voltage fluctuates greatly, the inductor and capacitor need to be finely adjusted within a small range to maintain the stability of the commutation process. This formula can adjust the inductor and capacitor values of the commutation loop according to the voltage change.

[0237] Effect:

[0238] Reduce the impact of voltage fluctuations on the commutation process and improve commutation stability.

[0239] Adaptive adjustment of inductance and capacitance to make the commutation voltage curve smoother.

[0240] Optimize the commutation process and improve the commutation success rate.

[0241] An embodiment of the present invention also provides a thyristor commutation turn-off control system based on harmonic interference adaptive regulation. The system includes:

[0242] A data collection module for obtaining initial data related to thyristor turn-off by detecting the current operating state of the thyristor, including current value, forward voltage value, and external harmonic interference data, and forming an original turn-off data set.

[0243] A trigger signal generation module for calculating the expected commutation voltage value according to the original turn-off data set and generating a commutation trigger signal in combination with external harmonic interference parameters. The commutation trigger signal is used to drive the commutation circuit to perform commutation operations.

[0244] A loop dynamic adjustment module for adjusting the inductance value and capacitance value in the commutation circuit according to the commutation trigger signal, so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value and generates commutation circuit dynamic adjustment data.

[0245] A loop fine-tuning module for real-time monitoring of the change trend of the anode-cathode voltage of the thyristor during commutation operations and fine-tuning the inductance value of the commutation circuit according to the change trend to generate commutation circuit parameter data.

[0246] A turn-off signal generation module for generating a turn-off completion signal when the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable.

[0247] A turn-off process monitoring module for collecting and storing dynamic parameter data of the turn-off process to form a turn-off data set.

[0248] A report generation module for generating a thyristor turn-off report according to the turn-off data set, including the operating parameters of each stage during the turn-off process of the thyristor and the commutation circuit parameters.

[0249] It should be noted that this system corresponds to the above method. All implementation methods in the method embodiments above are applicable to this embodiment and can achieve the same technical effects.

[0250] An embodiment of the present invention further provides an electronic device, including: a processor and a memory storing a computer program. When the computer program is run by the processor, the above-mentioned method is executed. All implementation manners in the above method embodiments are applicable to this embodiment and can also achieve the same technical effects.

[0251] An embodiment of the present invention further provides a computer-readable storage medium storing instructions. When the instructions are run on a computer, the computer is made to execute the above-mentioned method. All implementation manners in the above method embodiments are applicable to this embodiment and can also achieve the same technical effects.

[0252] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A thyristor commutation turn-off control method based on harmonic interference adaptive regulation, characterized in that The method includes: By detecting the current operating state of the thyristor, initial data related to the thyristor turn-off is obtained, including current value, forward voltage value, and external harmonic interference data, to form an original turn-off data set; Based on the original turn-off data set, the expected commutation voltage value is calculated, and combined with the external harmonic interference parameters, a commutation trigger signal is generated, and the commutation trigger signal is used to drive the commutation circuit to perform a commutation operation; According to the commutation trigger signal, the inductance value and capacitance value in the commutation circuit are adjusted so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value, and commutation circuit dynamic adjustment data is generated; During the commutation operation, the change trend of the anode-cathode voltage of the thyristor is monitored in real time, and the inductance value of the commutation circuit is finely adjusted according to the change trend to generate commutation circuit parameter data; When the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable, a turn-off completion signal is generated; The dynamic parameter data of the turn-off process is collected and stored to form a turn-off data set; According to the turn-off data set, a thyristor turn-off report is generated, including the operating parameters of each stage during the thyristor turn-off process and the commutation circuit parameters.

2. The thyristor commutation turn-off control method based on harmonic interference adaptive regulation according to claim 1, wherein The obtaining of the initial data related to the thyristor turn-off by detecting the current operating state of the thyristor, including current value, forward voltage value, and external harmonic interference parameters, to form an original turn-off data set, includes: Collect the real-time signals of the thyristor input current and voltage to generate input signal data; Preprocess the input signal data, including denoising, filtering, and normalization processing, to generate clean signal data; According to the clean signal data, frequency domain analysis is performed using the fast Fourier transform to extract the harmonic frequency components and their amplitude characteristics outside the fundamental wave, and harmonic component data is generated; According to the spectral characteristics of the harmonic component data, key harmonic components are extracted by means of segmented sampling, and the key harmonic components are weighted in the frequency domain to generate external harmonic interference data; The external harmonic interference data, the real-time current value data and the forward voltage value data of the thyristor are combined to generate an original turn-off data set.

3. The thyristor commutation turn-off control method based on harmonic interference adaptive regulation according to claim 2, wherein The calculating of the expected commutation voltage value according to the current value and forward voltage value in the original turn-off data set, and combining with the external harmonic interference parameters to generate a commutation trigger signal, includes: According to the current value, forward voltage value, and external harmonic interference data in the original turn-off data set, calculate the expected commutation voltage value to generate expected commutation voltage data; where , is the expected commutation voltage, is the moment of the instantaneous current of the thyristor, is the forward voltage of the thyristor, is the reference voltage, is the regulation coefficient, is the interference intensity of the nth harmonic component, is the weight coefficient of the nth harmonic component, is the regulation coefficient of the nth harmonic component, is the highest order of harmonic calculation; According to the external harmonic interference data, calculate the commutation time window parameters to generate commutation time window data; where , is the commutation time window, is the basic commutation time window, is the adjustment coefficient; Jointly analyze the expected commutation voltage data and the commutation time window data, and calculate the trigger time according to the timing requirements of the commutation time window and the expected commutation voltage value to generate a preliminary commutation trigger signal; According to the electrical characteristics of the commutation circuit, perform signal shaping processing on the preliminary commutation trigger signal to generate a commutation trigger signal.

4. The thyristor commutation turn-off control method based on harmonic interference adaptive regulation according to claim 3, wherein The calculation formula for the trigger time is: , is the commutation trigger time, is the shortest trigger time, and is the adjustment coefficient.

5. The thyristor commutation turn-off control method based on harmonic interference adaptive regulation according to claim 4, characterized in that, The adjusting of the inductance value and capacitance value in the commutation circuit according to the commutation trigger signal so that the voltage waveform generated by the commutation circuit matches the expected commutation voltage value, and generating commutation circuit dynamic adjustment data, includes: Receive the commutation trigger signal, collect the initial inductance parameter and initial capacitance parameter of the current commutation loop, and generate the initial parameter data of the commutation loop; According to the expected commutation voltage data and commutation time window data, gradually optimize and adjust the inductance parameter of the commutation loop to generate optimized inductance parameter data; among them, , is the optimized inductance value after the first iteration, is the optimized inductance value after the th iteration, is the optimization step size, is the reference inductance value, is the inductance optimization objective function with respect to the optimized inductance partial derivative; where, , where is the usage time of the th iteration, is the commutation voltage after the th iteration, , and are weight coefficients; According to the optimized inductance parameter data, dynamically configure the capacitance parameter of the commutation loop to generate dynamic capacitance parameter data; among them, , where is the dynamic capacitance value, is the initial capacitance, is the final optimized inductance value, is the weight coefficient, is the reference time, is the adjustment coefficient, is the adjustment constant; According to the initial parameter data, optimized inductance parameter data and dynamic capacitance parameter data of the commutation loop, generate the dynamic adjustment data of the commutation loop, including the inductance adjustment value and capacitance adjustment value.

6. A thyristor commutation turn-off control method based on harmonic interference adaptive regulation according to claim 5, characterized in that When performing the commutation operation, real-time monitor the change trend of the anode-cathode voltage of the thyristor, and fine-tune the inductance value of the commutation loop according to the change trend to generate the commutation loop parameter data, including: By real-time collecting the anode-cathode voltage state of the thyristor, extract the anode-cathode voltage characteristics to generate the anode-cathode voltage curve data; According to the anode-cathode voltage curve data, calculate the voltage rise rate and fluctuation amplitude to generate the voltage change rate characteristic data; Compare the voltage change rate characteristic data with the preset turn-off determination threshold to obtain the comparison result; When the comparison result does not meet the requirements of the preset turn-off determination threshold, fine-tune the inductance parameter and capacitance parameter of the commutation loop in sequence according to the voltage change rate characteristic data to generate the commutation loop parameter data.

7. A thyristor commutation turn-off control method based on harmonic interference adaptive regulation according to claim 5, characterized in that, The commutation loop parameter data includes the fine-tuned inductance parameter and fine-tuned capacitance parameter, and their calculation formulas are respectively: , where is the fine-tuning inductance value, and is the adjustment coefficient, is the instantaneous change rate of the anode-cathode voltage; , where is the fine-tuning capacitance value, , and are the adjustment coefficients, is the anode-cathode voltage fluctuation amplitude.

8. A thyristor commutation turn-off control system based on harmonic interference adaptive regulation, characterized in that, Applied to the method according to any one of claims 1 to 7, the system includes: A data collection module, configured to obtain initial data related to thyristor turn-off, including current value, forward voltage value, and external harmonic interference data, by detecting the current operating state of the thyristor, and form an original turn-off data set; A trigger signal generation module, configured to calculate the expected commutation voltage value according to the original turn-off data set, and generate a commutation trigger signal in combination with the external harmonic interference parameter, where the commutation trigger signal is used to drive the commutation loop to perform a commutation operation; A loop dynamic adjustment module, configured to adjust the inductance value and capacitance value in the commutation loop according to the commutation trigger signal, so that the voltage waveform generated by the commutation loop matches the expected commutation voltage value, and generate the dynamic adjustment data of the commutation loop; A loop fine-tuning module, configured to real-time monitor the change trend of the anode-cathode voltage of the thyristor during the commutation operation, and fine-tune the inductance value of the commutation loop according to the change trend to generate the commutation loop parameter data; A turn-off signal generation module, configured to generate a turn-off completion signal when the change trend of the anode-cathode voltage of the thyristor is rapidly rising and stable; A turn-off process monitoring module, configured to collect and store the dynamic parameter data of the turn-off process to form a turn-off data set; A report generation module, configured to generate a thyristor turn-off report according to the turn-off data set, including the operating parameters of each stage during the thyristor turn-off process and the commutation loop parameters.

9. An electronic device, characterized in that, Including: One or more processors; A storage device for storing one or more programs, which when executed by the one or more processors cause the one or more processors to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, A program is stored in the computer-readable storage medium, and when the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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