A coordinated control method for parallel operation of inverters

Abstract

The present invention proposes a coordinated control method for parallel operation of inverters, which relates to the technical field of coordinated control for parallel operation of inverters. Voltage fluctuation change data at the grid voltage input end is acquired, and then a zero-crossing signal of the grid voltage is obtained to perform a zero-crossing interruption. According to the zero-crossing signal of the grid voltage, actual operation data of the inverter is acquired, and the operation deviation ratio of a unit inverter is calculated. According to the difference between the operation deviation ratio of the unit inverter and the average operation deviation ratio, the state of the inverter is determined to obtain inverter determination information, and ePWM adjusts the resource allocation of the inverter. According to the adjustment results before and after the zero-crossing interruption, the resource allocation parameters of the inverter are compensated and adjusted. By accurately acquiring grid voltage data, determining the state of the inverter, and dynamically adjusting the resource allocation parameters, the efficient and stable operation and fault handling of the inverter are realized, and the stability and reliability of the power system are improved.

Description

Technical Field

[0001] The present invention provides a coordinated control method for parallel operation of inverters, which relates to the technical field of coordinated control for parallel operation of inverters. Background Art

[0002] With the rapid development of power electronics technology, inverters, as an important part of the power system, have been widely used in new energy power generation, motor drive, grid connection and other fields. The technology of inverter parallel circuits, as an effective means to improve system capacity and reliability, is of great significance in practical applications. However, since there are multiple inverter units in the inverter parallel circuit, their operating states and performances are often affected by various factors, such as grid voltage fluctuations, load changes, zero-crossing interruptions, etc. Therefore, how to efficiently and stably manage the operation of the inverter parallel circuit has become an urgent problem to be solved in the current power electronics technology field. During the operation of the inverter parallel circuit, the timely triggering of the zero-crossing interruption is crucial for ensuring the stable operation of the inverter. However, in practical applications, due to various reasons, the zero-crossing interruption may not be triggered in time, resulting in abnormal operating states of the inverter parallel circuit. To solve this problem, the existing technology usually monitors the operating data of the inverter parallel circuit in real time and makes fault judgments and resource allocation adjustments based on the deviation between the operating data and the preset data. However, this method can only achieve preliminary fault detection and adjustment, and insufficiently considers the complexity and variability of the inverter parallel circuit, making it difficult to achieve precise and efficient adjustment. In addition, the adjustment of the inverter resource allocation parameters in the existing technology usually only relies on a single adjustment strategy, lacking a feedback and optimization mechanism for the adjustment results. This leads to the situation that the resource allocation parameters may not be able to adapt to the changes in system requirements in time during the operation of the inverter parallel circuit, thus affecting the stability and efficiency of the entire system. Summary of the Invention

[0003] The present invention provides a coordinated control method for parallel operation of inverters to solve the problems that since there are multiple inverter units in the inverter parallel circuit, their operating states and performances are often affected by various factors, such as grid voltage fluctuations, load changes, zero-crossing interruptions, etc. In practical applications, due to various reasons, the zero-crossing interruption may not be triggered in time, resulting in abnormal operating states of the inverter parallel circuit. The adjustment of the inverter resource allocation parameters in the existing technology usually only relies on a single adjustment strategy, lacking a feedback and optimization mechanism for the adjustment results. This leads to the situation that the resource allocation parameters may not be able to adapt to the changes in system requirements in time during the operation of the inverter parallel circuit, thus affecting the stability and efficiency of the entire system:

[0004] A coordinated control method for parallel operation of inverters proposed by the present invention, the method includes:

[0005] S1. Obtain the voltage fluctuation data at the grid voltage input terminal, and then obtain the grid voltage zero-crossing signal to perform a zero-crossing interruption.

[0006] S2. Obtain the actual operating data of the inverter according to the grid voltage zero-crossing signal, calculate the operating deviation ratio of a single inverter, and determine the inverter status based on the difference between the operating deviation ratio of a single inverter and the average operating deviation ratio to obtain inverter determination information, and ePWM adjusts the resource allocation of the inverter.

[0007] S3. Compensate and adjust the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0008] Further, the S1 includes:

[0009] Obtain the voltage data at the grid voltage input terminal at each moment in real time through a voltage monitoring device, and establish a time-series voltage fluctuation change diagram according to the voltage data.

[0010] Obtain the grid voltage zero-crossing signal in the time-series voltage fluctuation change diagram, perform signal conditioning on the grid voltage zero-crossing signal to obtain the conditioned grid voltage zero-crossing signal, and input the grid voltage zero-crossing signal to the voltage signal input terminal of the ePWM peripheral to perform a zero-crossing interruption.

[0011] Further, the S2 includes:

[0012] When it is detected that the zero-crossing interruption is not triggered in time, obtain the actual operating data of the inverter parallel circuit, and preprocess the actual operating data to obtain processed operating data.

[0013] Calculate the deviation ratio of the processed operating data of each inverter from the preset operating data to obtain the operating deviation ratio of a single inverter.

[0014] Calculate the average operating deviation ratio of all inverters according to the operating deviation ratio of a single inverter.

[0015] Calculate the difference between the average operating deviation ratio and the operating deviation ratio of each single inverter to obtain an inverter fault difference, compare the inverter fault difference with a preset fault threshold to obtain a comparison result.

[0016] Determine the inverter status according to the comparison result to obtain inverter determination information.

[0017] When the inverter fault difference is greater than the preset fault threshold, determine the corresponding single inverter as a faulty inverter.

[0018] When the inverter fault threshold meets or equals the preset fault threshold, determine the corresponding unit inverter as a normal inverter;

[0019] The ePWM performs resource allocation adjustment based on the inverter determination information.

[0020] Further, the ePWM performs resource allocation adjustment based on the inverter determination information, including:

[0021] When the inverter determination information of a unit inverter is a faulty inverter, obtain the parameter adjustment ratio of the ePWM according to the operation deviation ratio corresponding to the faulty inverter to obtain the first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio;

[0022] When the inverter determination information of a unit inverter is a normal inverter, obtain the parameter adjustment ratio of the ePWM according to the average operation deviation ratio to obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio to obtain the adjustment results of the faulty inverter and the normal inverter, and perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0023] Further, the S3 includes:

[0024] Obtain the adjustment results before and after each zero-crossing interruption, and calculate the adjustment compensation value according to the before and after adjustment results;

[0025] Perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment compensation value.

[0026] Further, the system includes:

[0027] A zero-crossing interruption module, configured to obtain the voltage fluctuation change data at the grid voltage input end, and then obtain the grid voltage zero-crossing signal for zero-crossing interruption;

[0028] A deviation distribution module, configured to obtain the actual operation data of the inverter according to the grid voltage zero-crossing signal, calculate the operation deviation ratio of the unit inverter, determine the inverter state according to the difference between the operation deviation ratio of the unit inverter and the average operation deviation ratio to obtain the inverter determination information, and the ePWM performs resource allocation adjustment on the inverter;

[0029] A zero-crossing compensation module, configured to perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0030] Further, the zero-crossing interruption module includes:

[0031] A fluctuation acquisition module, which is used to acquire the voltage data of the grid voltage input terminal at each moment in real time through a voltage monitoring device, and establish a time-sequence voltage fluctuation change graph according to the voltage data;

[0032] An interruption module, which is used to acquire the grid voltage zero-crossing signal in the time-sequence voltage fluctuation change graph, perform signal conditioning on the grid voltage zero-crossing signal to obtain the conditioned grid voltage zero-crossing signal, and input the grid voltage zero-crossing signal to the voltage signal input terminal of the ePWM peripheral to perform zero-crossing interruption.

[0033] Further, the deviation distribution module includes:

[0034] A deviation calculation module, which is used to acquire the actual operation data of the inverter parallel circuit when it is detected that the zero-crossing interruption is not triggered in time, preprocess the actual operation data to obtain the processed operation data;

[0035] Calculate the deviation ratio of the processed operation data of each inverter to the preset operation data to obtain the operation deviation ratio of a single inverter;

[0036] Calculate the average operation deviation ratio of all inverters according to the operation deviation ratio of a single inverter;

[0037] A deviation comparison module, which is used to calculate the difference between the average operation deviation ratio and the operation deviation ratio of each single inverter to obtain the inverter fault difference, compare the inverter fault difference with a preset fault threshold to obtain a comparison result;

[0038] Judge the inverter state according to the comparison result to obtain the inverter judgment information;

[0039] A state judgment module, which is used to judge the corresponding single inverter as a faulty inverter when the inverter fault difference is greater than the preset fault threshold;

[0040] When the inverter fault threshold is equal to the preset fault threshold, judge the corresponding single inverter as a normal inverter;

[0041] A resource allocation module, which is used for ePWM to perform resource allocation adjustment through the inverter judgment information.

[0042] Further, the resource allocation module includes:

[0043] A first adjustment module, which is used to obtain the parameter adjustment ratio of ePWM according to the operation deviation ratio of a single inverter corresponding to a faulty inverter when the inverter judgment information of a single inverter is a faulty inverter to obtain a first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio;

[0044] The second adjustment module is used to obtain the parameter adjustment ratio of ePWM according to the average operation deviation ratio when the inverter determination information of the unit inverter is a normal inverter, obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain the adjustment results of the faulty inverter and the normal inverter, and perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0045] Furthermore, the zero-crossing compensation module includes:

[0046] The compensation calculation module is used to obtain the adjustment results before and after each zero-crossing interruption and calculate the adjustment compensation value according to the adjustment results before and after;

[0047] The compensation adjustment module is used to perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment compensation value.

[0048] Advantages of the present invention: By real-time monitoring the grid voltage fluctuation data, the system can accurately obtain the grid voltage zero-crossing signal, providing a basis for the precise control of the inverter. By comparing the actual operation data with the preset data, the system can timely detect the operation deviation of the inverter and dynamically adjust the resource allocation parameters according to the deviation ratio to ensure the stable and efficient operation of the inverter. Through the inverter status determination mechanism, the system can timely detect and handle the fault status of the inverter, avoiding the expansion of the fault and affecting the stable operation of the entire power system. Through continuous adjustment and compensation of the resource allocation parameters, the system can adapt to the changes of the grid voltage and the fluctuations of the inverter load, improving the adaptability and reliability of the entire inverter system. By accurately obtaining the grid voltage data, determining the inverter status and dynamically adjusting the resource allocation parameters, the efficient and stable operation and fault handling of the inverter are realized, improving the stability and reliability of the power system. Description of the Drawings

[0049] Figure 1 It is a schematic diagram of a method for coordinated control of parallel operation of inverters;

[0050] Figure 2 It is a schematic diagram of resource allocation adjustment. Detailed Embodiments

[0051] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0052] In one embodiment of the present invention, a method for coordinated control of parallel operation of inverters proposed by the present invention includes:

[0053] S1. Obtain the voltage fluctuation change data at the grid voltage input end, and then obtain the zero-crossing signal of the grid voltage to perform a zero-crossing interruption;

[0054] S2. Obtain the actual operation data of the inverter according to the zero-crossing signal of the grid voltage, calculate the operation deviation ratio of a single inverter, and determine the state of the inverter based on the difference between the operation deviation ratio of a single inverter and the average operation deviation ratio to obtain inverter determination information, and ePWM adjusts the resource allocation of the inverter;

[0055] S3. Compensate and adjust the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0056] The working principle of the above technical solution is as follows: The voltage monitoring device continuously collects the voltage data at the grid voltage input end, and these data reflect the real-time fluctuation changes of the grid voltage. According to the collected voltage data, a time-series voltage fluctuation change graph is constructed to accurately identify the zero-crossing moment of the grid voltage, that is, the turning point where the voltage changes from positive to zero or from negative to zero. During the zero-crossing interruption, the inverter control system obtains and records the actual operation data of the inverter, and these data include key parameters such as output voltage, current, and power. Compare the actual operation data with the preset operation data, and calculate the operation deviation ratio of a single inverter, that is, the difference or ratio between the actual operation data and the preset data. At the same time, calculate the average operation deviation ratio of all inverters to evaluate the overall operation state of the entire inverter system. By comparing the difference between the operation deviation ratio of a single inverter and the average operation deviation ratio, determine the state of the inverter, such as normal, faulty, or performance degradation, etc. The ePWM module dynamically adjusts the resource allocation parameters of the inverter, such as the duty cycle and frequency of the PWM wave, to achieve the efficient and stable operation of the inverter. After the resource allocation adjustment, the system continues to monitor and record the adjustment results before and after each zero-crossing interruption. According to the adjustment compensation value, further fine-tune the resource allocation parameters of the inverter to compensate for the previous adjustment deviation and optimize the operation performance of the inverter.

[0057] The technical effects of the above technical solution are as follows: By monitoring the grid voltage fluctuation data in real time, the system can accurately obtain the zero-crossing signal of the grid voltage, providing a basis for the precise control of the inverter. By comparing the actual operation data with the preset data, the system can timely detect the operation deviation of the inverter and dynamically adjust the resource allocation parameters according to the deviation ratio to ensure the stable and efficient operation of the inverter. Through the inverter status determination mechanism, the system can timely detect and handle the fault status of the inverter, avoiding the expansion of the fault and affecting the stable operation of the entire power system. Through continuous adjustment and compensation of the resource allocation parameters, the system can adapt to the changes in the grid voltage and the fluctuations of the inverter load, improving the adaptability and reliability of the entire inverter system. By accurately obtaining the grid voltage data, determining the inverter status, and dynamically adjusting the resource allocation parameters, the efficient and stable operation and fault handling of the inverter are realized, improving the stability and reliability of the power system.

[0058] In one embodiment of the present invention, S1 includes:

[0059] The voltage monitoring device is used to obtain the voltage data of the grid voltage input terminal at each moment in real time, and a time-series voltage fluctuation change graph is established according to the voltage data;

[0060] The zero-crossing signal of the grid voltage is obtained in the time-series voltage fluctuation change graph, the zero-crossing signal of the grid voltage is subjected to signal conditioning to obtain the conditioned zero-crossing signal of the grid voltage, and the zero-crossing signal of the grid voltage is input to the voltage signal input terminal of the ePWM peripheral to perform a zero-crossing interruption. The signal conditioning includes filtering, amplification or shaping operations.

[0061] The working principle of the above technical solution is as follows: The voltage monitoring device continuously monitors the grid voltage input terminal in real time to ensure that the voltage data at each moment can be accurately captured. These data reflect the dynamic change characteristics of the grid voltage. Based on the obtained voltage data, the system constructs a time-series voltage fluctuation change graph. This graph can clearly show the voltage waveform changing with time, providing a basis for subsequent zero-crossing signal detection. In the time-series voltage fluctuation change graph, the system can accurately identify the zero-crossing moment of the grid voltage, that is, the turning point where the voltage waveform changes from positive to zero or from negative to zero. These zero-crossing points mark the start of the grid voltage cycle and are key points for the control system to perform synchronous operations. The original zero-crossing signal may contain noise or interference and needs to be subjected to signal conditioning to ensure its quality and stability. The signal conditioning process includes operations such as filtering (removing high-frequency noise), amplification (increasing the signal amplitude), or shaping (adjusting the signal shape). The conditioned zero-crossing signal of the grid voltage is input to the voltage signal input terminal of the ePWM peripheral. When the ePWM peripheral detects this signal, a zero-crossing interruption will be triggered. The zero-crossing interruption provides an accurate timing reference for the control of the inverter or other power electronic devices.

[0062] The technical effects of the above technical solution are as follows: Through the real-time monitoring of the voltage monitoring device, the system can obtain the latest grid voltage data, providing real-time and accurate information for subsequent zero-crossing signal detection. The establishment of the time-sequence voltage fluctuation change diagram makes the detection of zero-crossing signals more accurate. The system can clearly identify the turning points of the voltage waveform, thus ensuring the accuracy of zero-crossing signals. By performing conditioning operations such as filtering, amplifying, or shaping on the zero-crossing signals of the grid voltage, the noise and interference in the signals are effectively removed, improving the quality and stability of the signals. The triggering of zero-crossing interrupts provides an accurate timing reference for the control of inverters or other power electronic devices. This enables the control system to better synchronize with the changes in the grid voltage, improving the synchronization and stability of the system. By accurately obtaining the zero-crossing signals of the grid voltage and implementing zero-crossing interrupts, the system can achieve precise control of inverters or other power electronic devices, thereby enhancing the performance and stability of the entire power system. By obtaining grid voltage data in real time, establishing a time-sequence voltage fluctuation change diagram, obtaining and conditioning zero-crossing signals, and implementing zero-crossing interrupts, the real-time performance and accuracy of grid voltage monitoring are improved, the signal quality is optimized, and the performance and stability of the power system are enhanced.

[0063] In an embodiment of the present invention, S2 includes:

[0064] When it is detected that the zero-crossing interrupt is not triggered in time, obtain the actual operation data of the inverter parallel circuit, preprocess the actual operation data to obtain processed operation data;

[0065] Calculate the deviation ratio between the processed operation data of each inverter and the preset operation data to obtain the unit inverter operation deviation ratio; the unit inverter operation deviation ratio = actual operation data / preset operation data.

[0066] Calculate the average operation deviation ratio of all inverters according to the unit inverter operation deviation ratio;

[0067] Calculate the difference between the average operation deviation ratio and each unit inverter operation deviation ratio to obtain the inverter fault difference, and compare the inverter fault difference with a preset fault threshold to obtain a comparison result;

[0068] Judge the inverter status according to the comparison result to obtain inverter judgment information;

[0069] When the inverter fault difference is greater than the preset fault threshold, determine the corresponding unit inverter as a faulty inverter;

[0070] When the inverter fault threshold meets and is equal to the preset fault threshold, determine the corresponding unit inverter as a normal inverter;

[0071] The ePWM adjusts resource allocation based on the inverter determination information.

[0072] The working principle of the above technical solution is as follows: The system continuously monitors the triggering of the zero-crossing interruption. When it is detected that the zero-crossing interruption is not triggered in a timely manner, it indicates that there may be some problems or abnormalities, and it is necessary to further check the operating status of the inverter. In the case where the zero-crossing interruption is not triggered in a timely manner, the system obtains the actual operating data of the inverter parallel circuit, including key parameters such as voltage, current, and power. The actual operating data is preprocessed to eliminate noise, outliers, or perform normalization operations, etc., to ensure the accuracy and comparability of the data. The processed operating data of each inverter is compared with the preset operating data, and the deviation ratio is calculated. Here, the ratio of the actual operating data to the preset operating data is used as the operating deviation ratio of a single inverter. According to the operating deviation ratios of all inverters, the average operating deviation ratio is calculated to evaluate the overall operating condition of the entire inverter parallel circuit. The difference between the average operating deviation ratio and the operating deviation ratio of each single inverter is calculated to obtain the inverter fault difference. The inverter fault difference is compared with the preset fault threshold. When the fault difference is greater than the preset threshold, the corresponding single inverter is determined to be a faulty inverter; when the fault difference is less than or equal to the preset threshold, the corresponding single inverter is determined to be a normal inverter. The ePWM module adjusts resource allocation according to the inverter determination information. For faulty inverters, the system may take protective measures, such as reducing its output power or completely disconnecting its operation; for normal inverters, the system optimizes resource allocation according to their operating status to maintain the stability and efficiency of the entire parallel circuit.

[0073] The technical effects of the above technical solution are as follows: By real-time monitoring the triggering of the zero-crossing interruption, potential problems can be discovered and solved in a timely manner to ensure the stable operation of the inverter parallel circuit. By comparing the deviation ratios of the actual operating data and the preset data, and calculating the comparison result of the fault difference and the preset threshold, the status of the inverter can be accurately determined, providing a basis for subsequent resource allocation adjustment. According to the determination information of the inverter, the ePWM module can dynamically adjust the resource allocation parameters of the inverter to ensure that corresponding measures can be taken in a timely manner when the inverter fails or its performance deteriorates, and at the same time optimize the operating performance of normal inverters. By accurately monitoring the inverter status and performing resource allocation adjustment, the reliability and efficiency of the entire power system are improved, reducing system instability and energy waste problems caused by inverter failures or performance deterioration. By monitoring the triggering of the zero-crossing interruption, obtaining the operating data of the inverter parallel circuit, calculating the operating deviation ratio and the fault difference, determining the inverter status, and performing resource allocation adjustment and other steps, the stable operation and fault handling of the inverter parallel circuit are realized, improving the reliability and efficiency of the power system.

[0074] In one embodiment of the present invention, the ePWM performs resource allocation adjustment based on inverter determination information, including:

[0075] When the inverter determination information of a unit inverter is a faulty inverter, obtain the parameter adjustment ratio of the ePWM according to the operation deviation ratio of the unit inverter corresponding to the faulty inverter, obtain the first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio;

[0076] When the inverter determination information of a unit inverter is a normal inverter, obtain the parameter adjustment ratio of the ePWM according to the average operation deviation ratio, obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain the adjustment results of the faulty inverter and the normal inverter, and perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0077] The working principle of the above technical solution is as follows: When the inverter determination information of a unit inverter is a faulty inverter, obtain the parameter adjustment ratio of the ePWM according to the operation deviation ratio of the unit inverter corresponding to the faulty inverter, obtain the first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio; the first adjustment ratio = preset parameter data / parameter data to be adjusted, and the parameter adjustment ratio of the faulty inverter = operation deviation ratio of the unit inverter; adjust the resource allocation parameters of the faulty inverter according to the parameter data to be adjusted. The resource allocation parameters include output frequency, voltage, current, etc.

[0078] When the inverter determination information of a unit inverter is a normal inverter, obtain the parameter adjustment ratio of the ePWM according to the average operation deviation ratio, obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain the adjustment results of the faulty inverter and the normal inverter, and perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption. The second adjustment ratio = preset parameter data / parameter data to be adjusted, and the parameter adjustment ratio of the normal inverter = average operation deviation ratio; adjust the resource allocation parameters of the normal inverter according to the parameter data to be adjusted. The parameter data to be adjusted is the reverse adjustment of the actual operation data. When the actual processing operation data is greater than the preset operation data, perform a corresponding reduction adjustment on the resource allocation parameters. When the actual processing operation data is less than or equal to the preset operation data, perform a corresponding increase adjustment on the resource allocation parameters. As Figure 2 shown.

[0079] The technical effects of the above technical solution are as follows: When a unit inverter is determined to be a faulty inverter, the system calculates the first adjustment ratio of ePWM based on the operation deviation ratio of the inverter and directly adjusts the resource allocation parameters of the faulty inverter. This precise adjustment ensures that the faulty inverter can respond quickly, reducing the impact of the fault on the entire system. By adjusting key parameters such as the output frequency, voltage, and current of the faulty inverter, the system can effectively suppress the abnormal behavior of the faulty inverter and prevent it from deteriorating further, thus maintaining the stability of the system. For the units determined to be normal inverters, the system calculates the second adjustment ratio of ePWM based on the average operation deviation ratio and adjusts their resource allocation parameters accordingly. This optimized adjustment aims to further improve the operation efficiency of normal inverters while maintaining stable operation. By adjusting parameters such as the output frequency, voltage, and current of normal inverters, the system can ensure that they operate in the best state, thereby improving the overall efficiency of the entire inverter parallel circuit. The system not only makes an initial adjustment to the resource allocation parameters according to the inverter determination information but also compensates and adjusts the parameters based on the adjustment results before and after the zero-crossing interruption. This dynamic compensation mechanism enhances the adaptability of the system, enabling it to better cope with external disturbances such as grid voltage fluctuations and load changes. By continuously monitoring and adjusting the resource allocation parameters of the inverters, the system can ensure that the inverter parallel circuit operates stably and efficiently under various working conditions. Through the above adjustment strategy, the system can timely detect and handle the fault state of the inverter, avoiding the serious impact on the entire power system caused by the spread of the fault. At the same time, optimizing the operation state of normal inverters also improves the overall performance of the power system. This intelligent inverter state monitoring and resource allocation adjustment method not only improves the reliability of the power system but also enhances its security, providing a strong guarantee for the stable operation of the power system. By precisely adjusting faulty inverters, optimizing the operation state of normal inverters, dynamically compensating resource allocation parameters, and enhancing the reliability and security of the power system, the efficient and stable operation management of the inverter parallel circuit is realized, improving the performance and stability of the entire power system.

[0080] In one embodiment of the present invention, S3 includes:

[0081] Obtain the adjustment results before and after each zero-crossing interruption, and calculate the adjustment compensation value according to the adjustment results before and after;

[0082] Compensate and adjust the resource allocation parameters of the inverter according to the adjustment compensation value.

[0083] The calculation formula of the adjustment compensation value:

[0084] QT - HT = (YT - yt) * ΔB * α

[0085] Among them, ΔB is the adjustment compensation value, QT is the pre-adjustment result of the zero-crossing interruption, HT is the post-adjustment result of the zero-crossing interruption, YT is the data to be adjusted, yt is the adjusted data, and α is the adjustment coefficient, whose value range is the data to be adjusted of the average operation deviation of the inverter before the interruption - the data to be adjusted of the average operation deviation of the inverter after the interruption.

[0086] The working principle of the above technical solution is as follows: Each time a zero-crossing interruption occurs in the system, the adjustment results of the resource allocation parameters of the current inverter will be recorded. This includes the parameter values before and after adjustment, reflecting the impact of the adjustment operation on the inverter state. Based on the pre- and post-adjustment results, the system calculates the adjustment compensation value. This compensation value reflects the deviation between the adjustment operation and the desired state, and is used to further optimize the resource allocation of the inverter affected by the zero-crossing interruption. The calculation of the adjustment compensation value may involve various algorithms and strategies, such as difference calculation, proportional adjustment, integral adjustment, etc., aiming to ensure that the inverter can respond more accurately to the system requirements. According to the calculated adjustment compensation value, the system performs compensation adjustment on the resource allocation parameters of the inverter. This adjustment is a further optimization of the initial adjustment result, aiming to eliminate residuals, improve accuracy or response speed. The compensation adjustment can be applied to various resource allocation parameters of the inverter, such as output frequency, voltage, current, etc., to ensure that the inverter can operate more stably and efficiently after the zero-crossing interruption.

[0087] The technical effects of the above technical solution are as follows: By obtaining the pre- and post-adjustment results of each zero-crossing interruption and calculating the adjustment compensation value, the system can more accurately grasp the operating state and adjustment requirements of the inverter. This helps to eliminate errors and residuals in the adjustment process, and improves the adjustment accuracy and stability of the inverter resource allocation parameters. The compensation adjustment can further optimize the operating performance of the inverter. By dynamically adjusting the resource allocation parameters, the system can ensure that the inverter can maintain the best operating state under various working conditions, improve its output power, efficiency and reliability, and can enhance the robustness of the power system, enabling it to better cope with external disturbances such as grid voltage fluctuations and load changes. By precisely adjusting and compensating the resource allocation parameters of the inverter, the system can maintain a stable power output and reduce system instability problems caused by inverter failures or performance degradation. By optimizing the resource allocation and compensation adjustment of the inverter, it helps to reduce energy waste and improve energy utilization efficiency. This is of great significance for energy conservation and emission reduction, reducing operating costs and promoting sustainable development.

[0088] In an embodiment of the present invention, the system includes:

[0089] A zero-crossing interruption module, configured to obtain the voltage fluctuation change data at the grid voltage input end, and then obtain the grid voltage zero-crossing signal to perform zero-crossing interruption;

[0090] The deviation allocation module is used to obtain the actual operation data of the inverter according to the zero-crossing signal of the grid voltage, calculate the operation deviation ratio of a single inverter, determine the inverter status based on the difference between the operation deviation ratio of a single inverter and the average operation deviation ratio, obtain the inverter determination information, and the ePWM adjusts the resource allocation of the inverter;

[0091] The zero-crossing compensation module is used to compensate and adjust the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

[0092] The working principle of the above technical solution is as follows: The voltage monitoring device continuously collects the voltage data at the grid voltage input end, and these data reflect the real-time fluctuation of the grid voltage. According to the collected voltage data, a time-series voltage fluctuation diagram is constructed to accurately identify the zero-crossing moment of the grid voltage, that is, the turning point where the voltage changes from positive to zero or from negative to zero. During the zero-crossing interruption, the inverter control system obtains and records the actual operation data of the inverter, including key parameters such as output voltage, current, and power. The actual operation data is compared with the preset operation data to calculate the operation deviation ratio of a single inverter, that is, the difference or ratio between the actual operation data and the preset data. At the same time, the average operation deviation ratio of all inverters is calculated to evaluate the overall operation status of the entire inverter system. By comparing the difference between the operation deviation ratio of a single inverter and the average operation deviation ratio, the status of the inverter is determined, such as normal, faulty, or performance degradation. The ePWM module dynamically adjusts the resource allocation parameters of the inverter, such as the duty cycle and frequency of the PWM wave, according to the inverter status determination information to achieve the efficient and stable operation of the inverter. After the resource allocation adjustment, the system continues to monitor and record the adjustment results before and after each zero-crossing interruption. According to the adjustment compensation value, the resource allocation parameters of the inverter are further fine-tuned to compensate for the previous adjustment deviation and optimize the operation performance of the inverter.

[0093] The technical effects of the above technical solution are as follows: By real-time monitoring the grid voltage fluctuation data, the system can accurately obtain the zero-crossing signal of the grid voltage, providing a basis for the precise control of the inverter. By comparing the actual operation data with the preset data, the system can timely detect the operation deviation of the inverter and dynamically adjust the resource allocation parameters according to the deviation ratio to ensure the stable and efficient operation of the inverter. Through the inverter status determination mechanism, the system can timely detect and handle the faulty status of the inverter, avoiding the expansion of the fault and affecting the stable operation of the entire power system. Through continuous adjustment and compensation of the resource allocation parameters, the system can adapt to the changes in the grid voltage and the fluctuations of the inverter load, improving the adaptability and reliability of the entire inverter system. By accurately obtaining the grid voltage data, determining the inverter status, and dynamically adjusting the resource allocation parameters, the efficient and stable operation of the inverter and the fault handling are achieved, improving the stability and reliability of the power system.

[0094] In one embodiment of the present invention, the zero-crossing interruption module includes:

[0095] A fluctuation acquisition module, configured to continuously acquire voltage data at the grid voltage input end at each moment through a voltage monitoring device, and establish a time-series voltage fluctuation change graph according to the voltage data;

[0096] An interruption module, configured to acquire a grid voltage zero-crossing signal in the time-series voltage fluctuation change graph, perform signal conditioning on the grid voltage zero-crossing signal to obtain a conditioned grid voltage zero-crossing signal, and input the grid voltage zero-crossing signal to the voltage signal input end of the ePWM peripheral to perform zero-crossing interruption. The signal conditioning includes filtering, amplification or shaping operations.

[0097] The working principle of the above technical solution is as follows: The voltage monitoring device of the fluctuation acquisition module continuously monitors the grid voltage input end in real time to ensure that the voltage data at each moment can be accurately captured. These data reflect the dynamic change characteristics of the grid voltage. Based on the acquired voltage data, the system constructs a time-series voltage fluctuation change graph. This graph can clearly show the waveform of the voltage changing with time, providing a basis for subsequent zero-crossing signal detection. In the time-series voltage fluctuation change graph, the interruption module can accurately identify the zero-crossing moment of the grid voltage, that is, the turning point where the voltage waveform changes from positive to zero or from negative to zero. These zero-crossing points mark the start of the grid voltage cycle and are key points for the control system to perform synchronous operations. The original zero-crossing signal may contain noise or interference and needs to be signal-conditioned to ensure its quality and stability. The signal conditioning process includes operations such as filtering (removing high-frequency noise), amplification (increasing the signal amplitude), or shaping (adjusting the signal shape). The conditioned grid voltage zero-crossing signal is input to the voltage signal input end of the ePWM peripheral. When the ePWM peripheral detects this signal, it will trigger a zero-crossing interruption. The zero-crossing interruption provides an accurate timing reference for the control of inverters or other power electronic devices.

[0098] The technical effects of the above technical solution are as follows: Through the real-time monitoring of the voltage monitoring device, the system can obtain the latest power grid voltage data, providing real-time and accurate information for the subsequent zero-crossing signal detection. The establishment of the time-sequence voltage fluctuation change diagram makes the detection of zero-crossing signals more accurate. The system can clearly identify the turning points of the voltage waveform, thus ensuring the accuracy of zero-crossing signals. By performing conditioning operations such as filtering, amplifying, or shaping on the power grid voltage zero-crossing signals, the noise and interference in the signals are effectively removed, improving the quality and stability of the signals. The triggering of zero-crossing interrupts provides an accurate timing reference for the control of inverters or other power electronic devices. This enables the control system to better synchronize with the changes in the power grid voltage, improving the synchronization and stability of the system. By accurately obtaining the power grid voltage zero-crossing signals and performing zero-crossing interrupts, the system can achieve precise control of inverters or other power electronic devices, thereby enhancing the performance and stability of the entire power system. By obtaining real-time power grid voltage data, establishing a time-sequence voltage fluctuation change diagram, obtaining and conditioning zero-crossing signals, and implementing zero-crossing interrupts, the real-time performance and accuracy of power grid voltage monitoring are improved, the signal quality is optimized, and the performance and stability of the power system are enhanced.

[0099] In an embodiment of the present invention, the deviation allocation module includes:

[0100] A deviation calculation module, configured to obtain the actual operation data of the inverter parallel circuit when it is detected that the zero-crossing interrupt is not triggered in time, preprocess the actual operation data to obtain processed operation data;

[0101] Calculate the deviation ratio between the processed operation data of each inverter and the preset operation data to obtain the unit inverter operation deviation ratio; the unit inverter operation deviation ratio = actual operation data / preset operation data.

[0102] Calculate the average operation deviation ratio of all inverters according to the unit inverter operation deviation ratio;

[0103] A deviation comparison module, configured to calculate the difference between the average operation deviation ratio and each unit inverter operation deviation ratio to obtain an inverter fault difference, compare the inverter fault difference with a preset fault threshold to obtain a comparison result;

[0104] Determine the inverter status according to the comparison result to obtain inverter determination information;

[0105] A status determination module, configured to determine the corresponding unit inverter as a faulty inverter when the inverter fault difference is greater than the preset fault threshold;

[0106] When the inverter fault threshold is equal to the preset fault threshold, determine the corresponding unit inverter as a normal inverter;

[0107] A resource allocation module for ePWM to perform resource allocation adjustment based on the inverter determination information.

[0108] The working principle of the above technical solution is as follows: The system continuously monitors the triggering of the zero-crossing interruption. When it is detected that the zero-crossing interruption is not triggered in a timely manner, it indicates that there may be some problems or abnormalities, and it is necessary to further check the operating status of the inverter. In the case where the zero-crossing interruption is not triggered in a timely manner, the deviation calculation module obtains the actual operating data of the inverter parallel circuit, including key parameters such as voltage, current, and power. The actual operating data is preprocessed to eliminate noise, outliers, or perform normalization operations to ensure the accuracy and comparability of the data. The processed operating data of each inverter is compared with the preset operating data, and the deviation ratio is calculated. Here, the ratio of the actual operating data to the preset operating data is used as the operating deviation ratio of a single inverter. Based on the operating deviation ratios of all inverters, the average operating deviation ratio is calculated to evaluate the overall operating condition of the entire inverter parallel circuit. The difference between the average operating deviation ratio and the operating deviation ratio of each single inverter is calculated to obtain the inverter fault difference. The deviation comparison module compares the inverter fault difference with the preset fault threshold. When the fault difference is greater than the preset threshold, the corresponding single inverter is determined to be a faulty inverter; when the fault difference is less than or equal to the preset threshold, the corresponding single inverter is determined to be a normal inverter. The ePWM module performs resource allocation adjustment based on the inverter determination information. For a faulty inverter, the system may take protective measures, such as reducing its output power or completely disconnecting its operation; for a normal inverter, the system optimizes the resource allocation according to its operating status to maintain the stability and efficiency of the entire parallel circuit.

[0109] The technical effects of the above technical solution are as follows: By real-time monitoring the triggering of the zero-crossing interruption, potential problems can be discovered and solved in a timely manner to ensure the stable operation of the inverter parallel circuit. By comparing the deviation ratios of the actual operating data and the preset data, and calculating the comparison result of the fault difference and the preset threshold, the status of the inverter can be accurately determined, providing a basis for subsequent resource allocation adjustment. According to the determination information of the inverter, the ePWM module can dynamically adjust the resource allocation parameters of the inverter to ensure that corresponding measures can be taken in a timely manner when the inverter fails or its performance deteriorates, and at the same time optimize the operating performance of normal inverters. By accurately monitoring the inverter status and performing resource allocation adjustment, the reliability and efficiency of the entire power system are improved, reducing system instability and energy waste problems caused by inverter failures or performance deterioration. By monitoring the triggering of the zero-crossing interruption, obtaining the operating data of the inverter parallel circuit, calculating the operating deviation ratio and the fault difference, determining the inverter status, and performing resource allocation adjustment and other steps, the stable operation and fault handling of the inverter parallel circuit are achieved, improving the reliability and efficiency of the power system.

[0110] In one embodiment of the present invention, the resource allocation module includes:

[0111] A first adjustment module, configured to, when the inverter determination information of a unit inverter is a faulty inverter, obtain a parameter adjustment ratio of ePWM according to the operation deviation ratio of the unit inverter corresponding to the faulty inverter, obtain a first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio; the first adjustment ratio = preset parameter data / parameter data to be adjusted, and the parameter adjustment ratio of the faulty inverter = operation deviation ratio of the unit inverter; adjust the resource allocation parameters of the faulty inverter according to the parameter data to be adjusted. The resource allocation parameters include output frequency, voltage, current, etc.

[0112] A second adjustment module, configured to, when the inverter determination information of a unit inverter is a normal inverter, obtain a parameter adjustment ratio of ePWM according to the average operation deviation ratio, obtain a second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain adjustment results of the faulty inverter and the normal inverter, and perform a compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption. The second adjustment ratio = preset parameter data / parameter data to be adjusted, and the parameter adjustment ratio of the normal inverter = average operation deviation ratio; adjust the resource allocation parameters of the normal inverter according to the parameter data to be adjusted. The parameter data to be adjusted is the reverse adjustment of the actual operation data. When the actual processing operation data is greater than the preset operation data, a corresponding reduction adjustment is performed on the resource allocation parameters. When the actual processing operation data is less than or equal to the preset operation data, a corresponding increase adjustment is performed on the resource allocation parameters.

[0113] The working principle of the above technical solution is as follows: The first adjustment module is used to obtain the parameter adjustment ratio of ePWM according to the operation deviation ratio of the unit inverter corresponding to the faulty inverter when the inverter determination information of the unit inverter is a faulty inverter, obtain the first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio; the first adjustment ratio = preset parameter data / parameter data to be adjusted, and the parameter adjustment ratio of the faulty inverter = operation deviation ratio of the unit inverter; adjust the resource allocation parameters of the faulty inverter according to the parameter data to be adjusted. The resource allocation parameters include output frequency, voltage, current, etc. The second adjustment module is used to obtain the parameter adjustment ratio of ePWM according to the average operation deviation ratio when the inverter determination information of the unit inverter is a normal inverter, obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain the adjustment results of the faulty inverter and the normal inverter, and perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption. The second adjustment ratio = preset parameter data / parameter data to be adjusted, and the parameter adjustment ratio of the normal inverter = average operation deviation ratio; adjust the resource allocation parameters of the normal inverter according to the parameter data to be adjusted. The parameter data to be adjusted is the reverse adjustment of the actual operation data. When the actual processing operation data is greater than the preset operation data, perform a corresponding reduction adjustment on the resource allocation parameters. When the actual processing operation data is less than or equal to the preset operation data, perform a corresponding increase adjustment on the resource allocation parameters.

[0114] The technical effects of the above technical solution are as follows: When a unit inverter is determined to be a faulty inverter, the system calculates the first adjustment ratio of ePWM based on the operation deviation ratio of the inverter and directly adjusts the resource allocation parameters of the faulty inverter. This precise adjustment ensures that the faulty inverter can respond quickly, reducing the impact of the fault on the entire system. By adjusting key parameters such as the output frequency, voltage, and current of the faulty inverter, the system can effectively suppress the abnormal behavior of the faulty inverter and prevent it from deteriorating further, thus maintaining the stability of the system. For the units determined to be normal inverters, the system calculates the second adjustment ratio of ePWM according to the average operation deviation ratio and adjusts their resource allocation parameters accordingly. This optimized adjustment aims to further improve the operation efficiency of normal inverters while maintaining stable operation. By adjusting parameters such as the output frequency, voltage, and current of normal inverters, the system can ensure that they operate in the best state, thereby improving the overall efficiency of the entire inverter parallel circuit. The system not only makes an initial adjustment of the resource allocation parameters according to the inverter determination information but also compensates and adjusts the parameters according to the adjustment results before and after the zero-crossing interruption. This dynamic compensation mechanism enhances the adaptability of the system, enabling it to better cope with external disturbances such as grid voltage fluctuations and load changes. By continuously monitoring and adjusting the resource allocation parameters of the inverter, the system can ensure that the inverter parallel circuit operates stably and efficiently under various working conditions. Through the above adjustment strategy, the system can promptly detect and handle the fault state of the inverter, avoiding the serious impact on the entire power system caused by the spread of the fault. At the same time, optimizing the operation state of normal inverters also improves the overall performance of the power system. This intelligent method for monitoring the inverter state and adjusting resource allocation not only improves the reliability of the power system but also enhances its safety, providing a strong guarantee for the stable operation of the power system. By precisely adjusting faulty inverters, optimizing the operation state of normal inverters, dynamically compensating resource allocation parameters, and enhancing the reliability and safety of the power system, the efficient and stable operation management of the inverter parallel circuit is achieved, improving the performance and stability of the entire power system.

[0115] In one embodiment of the present invention, the zero-crossing compensation module includes:

[0116] A compensation calculation module, configured to obtain the adjustment results before and after each zero-crossing interruption and calculate an adjustment compensation value according to the adjustment results before and after;

[0117] A compensation adjustment module, configured to perform compensation adjustment on the resource allocation parameters of the inverter according to the adjustment compensation value.

[0118] The working principle of the above technical solution is as follows: Each time a zero-crossing interruption occurs, the system records the adjustment results of the resource allocation parameters of the current inverter. This includes the parameter values before and after adjustment, reflecting the impact of the adjustment operation on the inverter state. Based on the adjustment results before and after, the system calculates the adjustment compensation value. This compensation value reflects the deviation between the adjustment operation and the desired state and is used to further optimize the resource allocation of the inverter. The calculation of the adjustment compensation value may involve various algorithms and strategies, such as difference calculation, proportional adjustment, integral adjustment, etc., aiming to ensure that the inverter can respond more accurately to the system requirements. According to the calculated adjustment compensation value, the system performs compensation adjustment on the resource allocation parameters of the inverter. This adjustment is a further optimization of the initial adjustment result, aiming to eliminate residuals, improve accuracy, or response speed. The compensation adjustment can be applied to various resource allocation parameters of the inverter, such as output frequency, voltage, current, etc., to ensure that the inverter can operate more stably and efficiently after the zero-crossing interruption.

[0119] The technical effects of the above technical solution are as follows: By obtaining the adjustment results before and after each zero-crossing interruption and calculating the adjustment compensation value, the system can more accurately grasp the operating state and adjustment requirements of the inverter. This helps to eliminate errors and residuals in the adjustment process, improving the adjustment accuracy and stability of the inverter's resource allocation parameters. The compensation adjustment can further optimize the operating performance of the inverter. By dynamically adjusting the resource allocation parameters, the system can ensure that the inverter maintains the best operating state under various working conditions, improving its output power, efficiency, and reliability, and enhancing the robustness of the power system, enabling it to better cope with external disturbances such as grid voltage fluctuations and load changes. By precisely adjusting and compensating the resource allocation parameters of the inverter, the system can maintain a stable power output and reduce system instability problems caused by inverter failures or performance degradation. By optimizing the resource allocation and compensation adjustment of the inverter, this technology helps to reduce energy waste and improve energy utilization efficiency. This is of great significance for energy conservation and emission reduction, reducing operating costs, and promoting sustainable development.

[0120] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A coordinated control method for parallel operation of inverters, characterized in that, The method includes: S1. Obtain the voltage fluctuation change data at the grid voltage input end, and then obtain the grid voltage zero-crossing signal to perform zero-crossing interruption; S2. Obtain the actual operation data of the inverter according to the grid voltage zero-crossing signal, calculate the operation deviation ratio of a single inverter, and determine the inverter state according to the difference between the operation deviation ratio of a single inverter and the average operation deviation ratio to obtain the inverter determination information, and ePWM adjusts the resource allocation of the inverter; Obtain the operation deviation ratio of a single inverter and the average operation deviation ratio, calculate the difference between the two, and obtain the inverter fault difference; Obtain the inverter determination information of a single inverter according to the comparison between the inverter fault difference and the preset fault threshold; Perform the first proportional adjustment and the second proportional adjustment according to the inverter determination information to obtain the adjustment result; S3. Compensate and adjust the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

2. The coordinated control method for parallel operation of inverters according to claim 1, characterized in that, The S1 includes: Obtain the voltage data at the grid voltage input end at each moment in real time through a voltage monitoring device, and establish a time-series voltage fluctuation change graph according to the voltage data; Obtain the grid voltage zero-crossing signal in the time-series voltage fluctuation change graph, perform signal conditioning on the grid voltage zero-crossing signal to obtain the conditioned grid voltage zero-crossing signal, and input the grid voltage zero-crossing signal to the voltage signal input end of the ePWM peripheral to perform zero-crossing interruption.

3. The coordinated control method for parallel operation of inverters according to claim 1, characterized in that, The S2 includes: When it is detected that the zero-crossing interruption is not triggered in time, obtain the actual operation data of the inverter parallel circuit, and preprocess the actual operation data to obtain the processed operation data; Calculate the deviation ratio between the processed operation data of each inverter and the preset operation data to obtain the operation deviation ratio of a single inverter; Calculate the average operation deviation ratio of all inverters according to the operation deviation ratio of a single inverter; Calculate the difference between the average operation deviation ratio and the operation deviation ratio of each single inverter to obtain the inverter fault difference, and compare the inverter fault difference with the preset fault threshold to obtain the comparison result; Determine the inverter state according to the comparison result to obtain the inverter determination information; When the inverter fault difference is greater than the preset fault threshold, determine the corresponding single inverter as a faulty inverter; When the inverter fault threshold is less than or equal to the preset fault threshold, determine the corresponding single inverter as a normal inverter; ePWM adjusts the resource allocation through the inverter determination information.

4. The coordinated control method for parallel operation of inverters according to claim 3, characterized in that The ePWM adjusts the resource allocation through the inverter determination information, including: When the inverter determination information of a single inverter is a faulty inverter, obtain the parameter adjustment ratio of ePWM according to the operation deviation ratio of the single inverter corresponding to the faulty inverter to obtain the first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio; When the inverter determination information of the unit inverter is a normal inverter, obtain the parameter adjustment ratio of ePWM according to the average operation deviation ratio, obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain the adjustment results of the faulty inverter and the normal inverter, and perform a compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

5. The coordinated control method for parallel operation of inverters according to claim 1, wherein The S3 includes: Obtain the adjustment results before and after each zero-crossing interruption, and calculate the adjustment compensation value according to the adjustment results before and after; Perform a compensation adjustment on the resource allocation parameters of the inverter according to the adjustment compensation value.

6. A system for implementing the coordinated control method for parallel operation of an inverter as described in claim 1, characterized in that, The system includes: A zero-crossing interruption module, configured to obtain the voltage fluctuation change data at the grid voltage input terminal, and then obtain the grid voltage zero-crossing signal to perform zero-crossing interruption; A deviation allocation module, configured to obtain the actual operation data of the inverter according to the grid voltage zero-crossing signal, calculate the operation deviation ratio of the unit inverter, and determine the inverter state according to the difference between the unit inverter operation deviation ratio and the average operation deviation ratio to obtain the inverter determination information, and ePWM performs a resource allocation adjustment on the inverter; Obtain the operation deviation ratio of the unit inverter and the average operation deviation ratio, calculate the difference between the two, and obtain the inverter fault difference; Obtain the inverter determination information of the unit inverter according to the comparison between the inverter fault difference and the preset fault threshold; Perform a first ratio adjustment and a second ratio adjustment according to the inverter determination information to obtain an adjustment result; A zero-crossing compensation module, configured to perform a compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

7. The system of the coordinated control method for parallel operation of inverters according to claim 6, characterized in that, The zero-crossing interruption module includes: A fluctuation acquisition module, configured to obtain the voltage data at the grid voltage input terminal at each moment in real time through a voltage monitoring device, and establish a time-sequence voltage fluctuation change diagram according to the voltage data; An interruption module, configured to obtain the grid voltage zero-crossing signal in the time-sequence voltage fluctuation change diagram, perform signal conditioning on the grid voltage zero-crossing signal to obtain the conditioned grid voltage zero-crossing signal, and input the grid voltage zero-crossing signal to the voltage signal input terminal of the ePWM peripheral to perform zero-crossing interruption.

8. The system of the coordinated control method for parallel operation of inverters according to claim 6, characterized in that, The deviation allocation module includes: A deviation calculation module, configured to obtain the actual operation data of the inverter parallel circuit when it is detected that the zero-crossing interruption is not triggered in time, and preprocess the actual operation data to obtain the processed operation data; Calculate the deviation ratio between the processed operation data of each inverter and the preset operation data to obtain the operation deviation ratio of the unit inverter; Calculate the average operation deviation ratio of all inverters according to the operation deviation ratio of the unit inverter; A deviation comparison module, configured to calculate the difference between the average operation deviation ratio and the operation deviation ratio of each unit inverter to obtain the inverter fault difference, and compare the inverter fault difference with the preset fault threshold to obtain a comparison result; Determine the inverter state according to the comparison result to obtain the inverter determination information; A state determination module, configured to determine that the corresponding unit inverter is a faulty inverter when the inverter fault difference is greater than the preset fault threshold; When the inverter fault threshold is less than or equal to the preset fault threshold, it is determined that the corresponding unit inverter is a normal inverter; The resource allocation module is used to adjust the resource allocation through the inverter determination information by ePWM.

9. The system of the coordinated control method for parallel operation of inverters according to claim 8, characterized in that, The resource allocation module includes: The first adjustment module is used to, when the inverter determination information of the unit inverter is a faulty inverter, obtain the parameter adjustment ratio of ePWM according to the operation deviation ratio of the unit inverter corresponding to the faulty inverter, obtain the first adjustment ratio, and adjust the resource allocation parameters of the corresponding faulty inverter according to the first adjustment ratio; The second adjustment module is used to, when the inverter determination information of the unit inverter is a normal inverter, obtain the parameter adjustment ratio of ePWM according to the average operation deviation ratio, obtain the second adjustment ratio, adjust the resource allocation parameters of the corresponding normal inverter according to the second adjustment ratio, obtain the adjustment results of the faulty inverter and the normal inverter, and perform a compensation adjustment on the resource allocation parameters of the inverter according to the adjustment results before and after the zero-crossing interruption.

10. The system of the coordinated control method for parallel operation of inverters according to claim 6, characterized in that, The zero-crossing compensation module includes: The compensation calculation module is used to obtain the adjustment results before and after each zero-crossing interruption and calculate the adjustment compensation value according to the adjustment results before and after; The compensation adjustment module is used to perform a compensation adjustment on the resource allocation parameters of the inverter according to the adjustment compensation value.

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