Matrix converter low-frequency side outer ring reactive power control method and related device

Abstract

The invention provides a matrix converter low-frequency side outer ring reactive power control method and a related device, and the method comprises the steps: carrying out the matching processing based on the obtained operation scene data of the low-frequency side of a matrix converter, determining whether a reactive power control strategy is matched, and if the reactive power control strategy is matched, outputting a reactive power control strategy; if yes, performing coordinate conversion processing on three-phase voltage data and three-phase current data in the operation scene data to obtain voltage conversion data and current conversion data; calculating actual reactive power data based on the voltage conversion data and the current conversion data; performing deviation correction based on the actual reactive power and the obtained reactive power control target data to obtain a deviation correction signal, and performing feed-forward compensation on the reactive power control target data to obtain a feed-forward compensation signal; and performing fusion conversion processing on the feed-forward compensation signal and the deviation correction signal to obtain a control instruction signal, and adjusting the outer loop reactive power of the low-frequency side of the matrix converter based on the control instruction signal. The method improves the operation energy efficiency of the power system.

Description

Method and related devices for reactive power control of the low-frequency outer loop of a matrix converter Technical Field

[0001] This invention belongs to the field of converter technology, specifically to the method and related device for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter. Background Technology

[0002] As a high-performance power electronic conversion device without intermediate DC links, the matrix converter's low-frequency side outer loop control is the core link to ensure the reactive power balance of the grid side and improve power quality. It is widely used in scenarios such as new energy grid connection and grid reactive power compensation.

[0003] Current reactive power control schemes on the low-frequency side of matrix converters have significant technical shortcomings: existing methods mostly adopt a single closed-loop regulation strategy without introducing a command feedforward compensation mechanism, resulting in a lag in dynamic response speed and difficulty in quickly tracking sudden changes in reactive power commands; some schemes rely solely on simple proportional control to correct reactive power deviations, which easily leaves behind steady-state deviations and cannot achieve precise regulation; at the same time, most control methods do not configure adaptation strategies for different load operating scenarios (such as grid connection and islanded operation), which can easily lead to reactive power fluctuations and control inaccuracies when switching scenarios. Summary of the Invention

[0004] To address the problems of slow response, large steady-state deviation, and weak dynamic adaptability in the low-frequency side reactive power control of existing matrix converters, this invention provides a method and related apparatus for low-frequency side outer loop reactive power control of matrix converters.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention proposes a method for controlling the reactive power of the outer loop on the low-frequency side of a matrix converter, comprising the following steps: performing matching processing based on the acquired operating scenario data of the low-frequency side of the matrix converter to determine whether a reactive power control strategy is matched; if not matched, the control is terminated; if a reactive power control strategy is matched, performing coordinate transformation processing on the three-phase voltage data and three-phase current data in the operating scenario data to obtain voltage-converted data and current-converted data; calculating the actual reactive power data based on the voltage-converted data and the current-converted data; performing deviation correction processing on the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal, and performing feedforward compensation processing on the reactive power control target data to obtain a feedforward compensation signal; fusing and converting the feedforward compensation signal and the deviation correction signal to obtain a control command signal, and adjusting the outer loop reactive power of the low-frequency side of the matrix converter based on the control command signal.

[0006] Preferably, the step of matching based on the operating scenario data of the low-frequency side of the matrix converter to determine whether a reactive power control strategy is matched includes: acquiring the operating scenario data of the low-frequency side of the matrix converter; comparing the operating scenario data with corresponding preset thresholds to obtain comparison results; determining whether a grid connection scenario is matched based on the comparison results; if not matched, ending control; if a grid connection scenario is matched, acquiring the status data of the circuit breaker of the matrix converter and the continuous current on the load side; if the circuit breaker is in an open state and the continuous current data is greater than or equal to 5A, then a reactive power control strategy is matched; if not matched, ending control; wherein, the operating scenario data includes three-phase voltage data, three-phase current data, frequency data, and voltage phase data.

[0007] Preferably, the three-phase voltage data and three-phase current data in the operating scenario data are subjected to coordinate transformation processing to obtain voltage transformation data and current transformation data, including: performing Clark transformation on the three-phase voltage data and three-phase current data to obtain two-phase stationary voltage data and two-phase stationary current data; performing Park transformation on the two-phase stationary voltage data and two-phase stationary current data to obtain positive sequence voltage components and positive sequence current components in the dq coordinate system; and calculating the actual reactive power data based on the positive sequence voltage components and positive sequence current components.

[0008] Preferably, the calculation process for obtaining the actual reactive power data based on the positive sequence voltage component and the positive sequence current component is as follows:

[0009] In the formula, This is actual reactive power data. This represents the q-axis value of the positive sequence voltage. This represents the d-axis value of the positive sequence voltage. This represents the d-axis value of the positive sequence current. This represents the q-axis value of the positive sequence current.

[0010] Preferably, the deviation correction signal is obtained by performing deviation correction processing based on the actual reactive power and the acquired reactive power control target data, including: calculating the reactive power deviation based on the actual reactive power and the acquired reactive power control target data; performing deviation correction based on the reactive power deviation to obtain a basic correction signal; acquiring the low-frequency side voltage, low-frequency side current, power frequency side voltage, and power frequency side current, calculating the bridge arm power of each bridge arm, extracting the DC component, and performing coordinate transformation on the DC component to obtain the bridge arm power imbalance component in a two-phase stationary coordinate system; determining the current compensation component based on the bridge arm power imbalance component, and obtaining the current reference value under the double αβ0 transformation after coordinate transformation; and correcting the current reference value and the basic correction signal through proportional control dynamic correction to obtain the deviation correction signal.

[0011] Preferably, the reactive power control target data is subjected to feedforward compensation processing to obtain a feedforward compensation signal, including: acquiring the reactive power control target data and the power frequency voltage on the power frequency side of the matrix converter; performing a second-order low-pass filter on the power frequency voltage to obtain a smoothed voltage; and calculating the feedforward compensation signal based on the smoothed voltage and the reactive power control target data; wherein, the calculation process of the feedforward compensation signal is as follows:

[0012] In the formula, For feedforward compensation signal, To smooth the voltage, This is the target data for reactive power control.

[0013] Preferably, the feedforward compensation signal and the deviation correction signal are fused and converted to obtain a control command signal, including: linearly fusing the feedforward compensation signal and the deviation correction signal to obtain a current control command signal on the q-axis in the dq coordinate system; inputting the current control command signal into the matrix converter to obtain the adjusted reactive power data and bridge arm capacitor voltage data of the matrix converter; comparing the adjusted reactive power data with the reactive power control target data, and if the difference between the adjusted reactive power data and the reactive power control target data is >0.5kVar, then re-acquiring the operating scenario data to calculate the feedforward compensation signal and the deviation correction signal.

[0014] This invention proposes a low-frequency side outer-loop reactive power control system for a matrix converter, used to implement the aforementioned low-frequency side outer-loop reactive power control method for a matrix converter. The system includes: a scenario information matching and strategy generation module, configured to acquire operating scenario information of the low-frequency side of the matrix converter, perform matching processing on the scenario information to obtain a corresponding reactive power control strategy, and collect real-time voltage and current data under the reactive power control strategy; a data processing module, configured to perform coordinate transformation processing on the real-time voltage and current data to obtain voltage-converted data and current-converted data; and a reactive power calculation module, configured to... The system is configured to: calculate actual reactive power data based on the voltage conversion data and the current conversion data; perform deviation correction processing on the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal, and perform feedforward compensation processing on the reactive power control target data to obtain a feedforward compensation signal; perform fusion conversion processing on the feedforward compensation signal and the deviation correction signal to obtain a control command signal; and perform adjustment module configuration to adjust the outer loop reactive power on the low-frequency side of the matrix converter based on the control command signal.

[0015] The present invention proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein the processor executes the computer program to implement the steps of the above-described matrix converter low-frequency side outer loop reactive power control method.

[0016] This invention proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described matrix converter low-frequency side outer loop reactive power control method.

[0017] Compared with existing technologies, this invention has the following beneficial technical effects: This invention proposes a reactive power control method for the low-frequency outer loop of a matrix converter. This method constructs a data matching and judgment mechanism for operating scenarios, initiating subsequent control processes only when adapting to the reactive power control strategy, thus avoiding ineffective control overhead. Simultaneously, it forms scenario-based adaptation logic for the differences between load characteristics and control objectives in grid connection scenarios, effectively solving the problems of reactive power fluctuations and control inaccuracies during switching processes caused by the lack of scenario adaptation mechanisms in traditional control methods, thereby reducing the amplitude of reactive power fluctuations. Furthermore, by using coordinate transformation processing, the original three-phase voltage and current data are converted into decoupled voltage and current conversion data, eliminating the inherent coupling interference of three-phase AC quantities and reducing reactive power consumption. The calculation error of the reactive power is addressed through a combined control mechanism of deviation correction and feedforward compensation. Deviation correction eliminates steady-state deviations, while feedforward compensation responds in advance to changes in reactive power commands, forming complementary control logic. This achieves optimal synergy between dynamic response speed and steady-state adjustment accuracy, effectively suppressing the impact of disturbances such as grid voltage fluctuations, load abrupt changes, and asymmetrical faults. It can maintain stable regulation even under high dynamic load or fault conditions, preventing voltage oscillations in the system and ensuring the reliable operation of the matrix converter, associated grid, and load. Through precise reactive power adjustment, it can quickly track grid reactive power demand in grid-connected scenarios, reducing grid reactive power transmission losses. In grid-connected scenarios, it can collaboratively maintain load-side voltage stability, improving the power quality and operational efficiency of the power system.

[0018] Furthermore, this method first collects operational scenario data such as three-phase voltage, three-phase current, frequency, and voltage phase on the low-frequency side of the matrix converter to comprehensively reflect the operating conditions and avoid misjudgment based on a single dimension. Then, the data is compared with a preset quantization threshold to improve the reliability of scenario identification. If a match is found, the control strategy is activated; if a mismatch is found, the control is terminated. This improves the accuracy of scenario matching, avoids ineffective control in non-target scenarios, reduces the computing power consumption of the controller, avoids the adjustment disorder caused by blind activation of traditional strategies, reduces the action of switching transistors, and extends the service life of the equipment. Attached Figure Description

[0019] Figure 1 is a flowchart illustrating the reactive power control method for the low-frequency outer loop of a matrix converter provided by the present invention; Figure 2 is a schematic diagram of a computer device provided in an embodiment of the present invention; Figure 3 is a block diagram of a chip provided by the present invention according to an embodiment. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] As a high-performance power electronic conversion device with no intermediate DC link and bidirectional power transmission, the matrix converter has become a key core device in fields such as new energy grid connection, flexible AC transmission, industrial drives, and microgrid power supply, thanks to its core advantages of compact size, high efficiency, and excellent power quality. Its low-frequency side outer loop control directly determines the stability, accuracy, and dynamic response performance of reactive power transmission, and is a core component for ensuring reactive power balance on the grid side, suppressing voltage fluctuations, and improving power quality. In large-scale wind / solar grid-connected scenarios, reactive power regulation can smooth the grid impact caused by fluctuations in new energy output; in urban distribution networks, it can specifically compensate for reactive power losses of inductive loads and optimize the grid power factor; and in remote microgrids or isolated power supply systems, it is a crucial support for maintaining local voltage amplitude and frequency stability.

[0023] Current reactive power control schemes on the low-frequency side of matrix converters still have significant technical shortcomings, making it difficult to meet the high-precision control requirements under complex operating conditions. Firstly, existing methods mostly employ a single PI closed-loop regulation strategy without systematically introducing a command feedforward compensation mechanism, resulting in a significant lag in dynamic response speed. When reactive power commands change abruptly (such as a step change in grid dispatch commands or sudden load switching), the adjustment time typically exceeds 0.5 seconds, far from meeting the millisecond-level response requirements for renewable energy grid connection. Secondly, some low-cost schemes rely solely on simple proportional control for deviation correction, lacking the steady-state error elimination capability of the integral stage. In actual operation, steady-state deviations... The error rate is often 3% to 5%, making it difficult to achieve accurate reactive power tracking. Third, most control methods have not established a sound scenario adaptation mechanism, and do not adequately consider the differences in load characteristics and control objectives between the two core scenarios of grid connection and islanded operation. When switching scenarios, there is a lack of smooth transition strategies, which can easily lead to reactive power fluctuation amplitude exceeding 10%, control inaccuracy, and even cause brief voltage flicker. In addition, a few schemes that attempt to introduce feedforward or scenario adaptation have not designed a circulating current compensation mechanism in combination with the power imbalance characteristics of the matrix converter bridge arm. Under asymmetrical faults or high dynamic load conditions, there are still defects such as decreased regulation accuracy and insufficient system stability.

[0024] In grid connection scenarios, with the large-scale centralized grid connection of new energy power generation, the rapid and accurate adjustment of reactive power is directly related to the grid voltage stability and power factor optimization. The intermittent output of distributed photovoltaic and wind power will cause frequent changes in grid reactive power demand. The response lag of existing methods can easily cause grid voltage deviation to exceed the ±7% threshold specified in GB / T12325-2022, and even affect grid frequency stability. In island operation scenarios (such as microgrids in remote areas and power supply to offshore platforms), the defects in the coordinated control of reactive power and voltage will directly reduce the power supply quality of local loads. Especially for voltage-sensitive loads such as precision instruments and medical equipment, excessive voltage fluctuations will lead to abnormal equipment operation. In high-dynamic load scenarios such as industrial robots and electric vehicle charging piles, the response lag and steady-state deviation of existing methods may cause system voltage oscillations. If the oscillation frequency is superimposed on the load resonant frequency, it will cause overcurrent damage to power switching tubes, which will seriously restrict the reliable application of matrix converters under complex operating conditions. Furthermore, as the power system develops towards a "dual high" direction of high proportion of renewable energy and high proportion of power electronic equipment, the operating conditions faced by matrix converters are becoming increasingly complex, and the shortcomings of traditional control methods in terms of adaptability and stability are becoming increasingly prominent.

[0025] To address the above problems, this invention proposes a reactive power control method for the outer loop of a matrix converter on the low-frequency side, as shown in Figure 1. The method includes the following steps: First, matching processing is performed on the acquired operating scenario data of the matrix converter on the low-frequency side to determine whether a reactive power control strategy is matched. If not, control is terminated. If a reactive power control strategy is matched, coordinate transformation processing is performed on the three-phase voltage and three-phase current data in the operating scenario data to obtain voltage-converted data and current-converted data. Second, actual reactive power data is calculated based on the voltage-converted data and current-converted data. Third, deviation correction processing is performed between the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal. Then, feedforward compensation processing is performed on the reactive power control target data to obtain a feedforward compensation signal. Fourth, the feedforward compensation signal and the deviation correction signal are fused and converted to obtain a control command signal. Finally, the outer loop reactive power of the matrix converter on the low-frequency side is adjusted based on the control command signal.

[0026] This control method acquires and matches the operating scenario data from the low-frequency side of the matrix converter to determine whether it is compatible with the preset reactive power control strategy. If it is not compatible, the control process is terminated to avoid ineffective control overhead. At the same time, it forms scenario-based adaptation logic for the differences between the load characteristics and control objectives of the grid access scenario, effectively solving the problems of reactive power fluctuation and control inaccuracy during the switching process caused by the lack of scenario adaptation mechanism in traditional control methods. It ensures that the reactive power fluctuation amplitude is ≤5% during scenario switching, significantly optimizing the continuity and targeting of control. Secondly, if it is determined that the reactive power control strategy is compatible, coordinate transformation processing is performed on the three-phase voltage data and three-phase current data in the operating scenario data to obtain voltage conversion data and current conversion data, eliminating the inherent coupling interference of three-phase AC quantities and reducing the calculation error of reactive power. Secondly, the actual reactive power data is calculated based on the voltage conversion data and the current conversion data. High-precision conversion data after decoupling ensures the accuracy and stability of the actual reactive power calculation results. Next, deviation correction processing is performed on the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal. Simultaneously, feedforward compensation processing is performed on the reactive power control target data to obtain a feedforward compensation signal. Deviation correction effectively eliminates steady-state deviations, while feedforward compensation can respond to changes in reactive power commands in advance. The two form a complementary and collaborative control logic, improving the system's dynamic response time and achieving optimal synergy between dynamic response speed and steady-state adjustment accuracy. This method, through precise reactive power adjustment, can quickly track the grid's reactive power demand in grid-connected scenarios, optimizing the grid power factor to above 0.95 and reducing grid reactive power transmission losses. In islanded operation scenarios, it can collaboratively maintain load-side voltage stability, ensuring voltage fluctuation amplitude ≤ ±5V, meeting the power quality requirements of voltage-sensitive loads, and comprehensively improving the power quality and operational efficiency of the power system.

[0027] Furthermore, in this embodiment, matching processing is performed based on the acquired low-frequency side operating scenario data of the matrix converter to determine whether a reactive power control strategy is matched. This includes: acquiring operating scenario data of the low-frequency side of the matrix converter, with a sampling frequency of 10kHz. The operating scenario data includes three-phase voltage data, three-phase current data, frequency data, and voltage phase data. The operating scenario data comprehensively reflects the operating conditions of the low-frequency side of the matrix converter, avoiding scenario misjudgment caused by a single data dimension; comparing the operating scenario data with corresponding preset thresholds to obtain comparison results; and determining whether a grid connection scenario is matched based on the comparison results. If the voltage phase threshold fluctuation is ≤±2° and the frequency threshold is stable at 50Hz±0.5Hz, it is considered a grid connection scenario. A clear judgment standard is constructed by quantifying the thresholds to ensure that the scenario judgment is appropriate for the grid operating characteristics. The system is designed to reduce control mismatch caused by unreasonable thresholds. If a mismatch occurs, control is terminated. If a grid connection scenario is matched, the status data of the circuit breaker in the matrix converter and the continuous current on the load side are obtained. If the circuit breaker is in the open state and the continuous current data is greater than or equal to 5A, the reactive power control strategy is matched. If a mismatch occurs, control is terminated. This dual-condition approach accurately locks the load power supply demand in islanded operation scenarios, ensuring that the reactive power control strategy is activated only under the target operating conditions, thus solving the problem of regulation disorder caused by the blind activation of traditional control strategies. If a mismatch occurs, control is terminated, forming a closed-loop judgment control system with multi-dimensional acquisition, quantitative comparison, dual verification, and adaptive activation. This improves the accuracy of scenario matching, reduces the probability of erroneous control, and extends the service life of equipment by timely termination of ineffective control, reducing unnecessary power switching actions.

[0028] Furthermore, in this embodiment, coordinate transformation processing is performed on the three-phase voltage data and three-phase current data in the operational scenario data to obtain voltage-transformed data and current-transformed data. This includes: performing a Clarke transform on the three-phase voltage data and three-phase current data to obtain two-phase stationary voltage data and two-phase stationary current data; and performing a Park transform on the two-phase stationary voltage data and two-phase stationary current data to obtain the positive-sequence voltage component and positive-sequence current component in the dq coordinate system, wherein the positive-sequence voltage component includes... and The positive sequence current component includes and The actual reactive power data is calculated based on the positive sequence voltage and current components. The calculation process for obtaining the actual reactive power data based on the positive sequence voltage and current components is as follows:

[0029] In the formula, This is actual reactive power data. This represents the q-axis value of the positive sequence voltage. This represents the d-axis value of the positive sequence voltage. This represents the d-axis value of the positive sequence current. This represents the q-axis value of the positive sequence current; where, during the calculation using the above formula, due to... << If the value is approximately zero, then ignore it. .

[0030] Preferably, a deviation correction signal is obtained by performing deviation correction processing based on the actual reactive power and the acquired reactive power control target data, including: calculating the reactive power deviation based on the actual reactive power and the acquired reactive power control target data; wherein, after performing a first-order low-pass filter on the actual reactive power, the cutoff frequency of the first-order low-pass filter is 5Hz, and the difference is processed with the reactive power control target data to obtain the reactive power deviation. .

[0031] in, In the formula, This is actual reactive power data. For reactive power control target data, This is the reactive power deviation.

[0032] Based on reactive power deviation Deviation correction is performed to obtain the basic correction signal; for example, the reactive power deviation is... The input is fed into a PI controller for proportional and integral processing, followed by ±5A limiting to obtain the base deviation correction signal; where the proportional coefficient of the PI controller is... Integral coefficient .

[0033] The calculation process for the basic deviation correction signal is as follows:

[0034] In the formula, The basic deviation correction signal This is the reactive power deviation. The proportional gain of the PI controller. The integral coefficient is... This is the limited range.

[0035] Obtain the low-frequency side voltage, low-frequency side current, power frequency side voltage, and power frequency side current, and calculate the bridge arm power for each bridge arm; the calculation process for the bridge arm power is as follows:

[0036] In the formula, For bridge arm power, For low-frequency side voltage, This is the power frequency side voltage. For low-frequency side current, This is the power frequency side current.

[0037] The DC component of the bridge arm power is extracted, and a dual αβ coordinate transformation is performed on the DC component. The unbalanced components of the bridge arm power along the α and β axes in the two-phase stationary coordinate system are obtained. .

[0038] The current compensation component is determined based on the power imbalance component of the bridge arm, and the current reference value under the double αβ0 transformation is obtained through coordinate transformation. The process for determining the current compensation component is as follows:

[0039] In the formula, For current compensation components, The power frequency voltage on the power frequency side of the matrix converter. This represents the unbalanced component of the bridge arm power.

[0040] The deviation correction signal is obtained by dynamically correcting the current reference value and the basic correction signal through proportional control; the dynamic correction process of the deviation correction signal is as follows:

[0041] In the formula, Based on the correction signal, The proportional gain of the PI controller. , These are all current reference values. This is the deviation correction signal.

[0042] Preferably, the reactive power control target data is subjected to feedforward compensation processing to obtain a feedforward compensation signal, including: acquiring the reactive power control target data and the power frequency voltage on the power frequency side of the matrix converter. A second-order low-pass filter is applied to the power frequency voltage to obtain a smoothed voltage. The cutoff frequency of the second-order low-pass filter is 10Hz; the feedforward compensation signal is calculated based on the smoothed voltage and reactive power control target data; the calculation process of the feedforward compensation signal is as follows:

[0043] In the formula, For feedforward compensation signal, To smooth the voltage, This is the target data for reactive power control.

[0044] Preferably, the feedforward compensation signal and the deviation correction signal are fused and converted to obtain a control command signal, including: linearly fusing the feedforward compensation signal and the deviation correction signal to obtain a current control command signal along the q-axis in the dq coordinate system. The process of linearly fusing the feedforward compensation signal and the deviation correction signal is as follows:

[0045] In the formula, For feedforward compensation signal, This is the deviation correction signal.

[0046] The current control command signal is input into the matrix converter to obtain the adjusted reactive power data and bridge arm capacitor voltage data of the matrix converter after adjustment; the adjusted reactive power data is compared with the reactive power control target data; if the difference between the adjusted reactive power data and the reactive power control target data is >0.5kVar, the operating scenario data is re-acquired to calculate the feedforward compensation signal and deviation correction signal.

[0047] This invention proposes a low-frequency side outer-loop reactive power control system for a matrix converter, used to implement the aforementioned low-frequency side outer-loop reactive power control method for a matrix converter. The system includes a scenario information matching and strategy generation module, a data processing module, a reactive power calculation module, a signal generation module, a signal processing module, and an execution adjustment module. The scenario information matching and strategy generation module is configured to acquire the operating scenario information of the low-frequency side of the matrix converter, perform matching processing on this scenario information to obtain the corresponding reactive power control strategy, and collect real-time voltage and current data under the reactive power control strategy. The data processing module is configured to perform coordinate transformation on the real-time voltage and current data. The system comprises the following modules: a voltage conversion module and a current conversion module; a reactive power calculation module, configured to calculate the actual reactive power data based on the voltage conversion data and the current conversion data; a signal generation module, configured to perform deviation correction processing on the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal, and to perform feedforward compensation processing on the reactive power control target data to obtain a feedforward compensation signal; a signal processing module, configured to fuse and convert the feedforward compensation signal and the deviation correction signal to obtain a control command signal; and an execution adjustment module, configured to adjust the outer loop reactive power on the low-frequency side of the matrix converter based on the control command signal.

[0048] In another embodiment of the present invention, a computer device is provided, comprising a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to realize the reactive power control method flow or corresponding function of the low-frequency side outer loop of the matrix converter. The processor in this embodiment can be used to implement the operation of the reactive power control method of the low-frequency side of the matrix converter, including: performing matching processing based on the acquired operating scenario data of the low-frequency side of the matrix converter to determine whether a reactive power control strategy is matched; if not matched, the control is terminated; if matched... With a reactive power control strategy, the three-phase voltage and current data in the operating scenario data are processed by coordinate transformation to obtain voltage-converted data and current-converted data. The actual reactive power data is calculated based on the voltage-converted data and current-converted data. Deviation correction processing is performed between the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal. Feedforward compensation processing is performed on the reactive power control target data to obtain a feedforward compensation signal. The feedforward compensation signal and the deviation correction signal are fused and converted to obtain a control command signal. The outer loop reactive power on the low-frequency side of the matrix converter is adjusted based on the control command signal.

[0049] In another embodiment of the present invention, a storage medium is also provided, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a terminal device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and extended storage media supported by the terminal device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device.

[0050] One or more instructions stored in a computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the low-frequency side outer loop reactive power control method of the matrix converter in the above embodiments. One or more instructions in the computer-readable storage medium are loaded and executed by the processor in the following steps: based on the acquired operating scenario data of the low-frequency side of the matrix converter, a matching process is performed to determine whether a reactive power control strategy is matched. If not matched, the control ends. If a reactive power control strategy is matched, the three-phase voltage data and three-phase current data in the operating scenario data are subjected to coordinate transformation processing to obtain voltage transformation data and current transformation data. The actual reactive power data is calculated based on the voltage transformation data and current transformation data. The deviation correction process is performed based on the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal, and the reactive power control target data is subjected to feedforward compensation processing to obtain a feedforward compensation signal. The feedforward compensation signal and the deviation correction signal are fused and converted to obtain a control command signal, and the outer loop reactive power of the low-frequency side of the matrix converter is adjusted based on the control command signal.

[0051] Referring to Figure 2, the terminal device is a computer device. In this embodiment, the computer device 60 includes a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When executed by the processor 61, the computer program 63 implements the low-frequency side outer loop reactive power control method of the matrix converter in this embodiment. To avoid repetition, details are omitted here. Alternatively, when executed by the processor 61, the computer program 63 implements the functions of each model / unit in the low-frequency side outer loop reactive power control system of the matrix converter in this embodiment. To avoid repetition, details are omitted here.

[0052] Computer device 60 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. Computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art will understand that Figure 2 is merely an example of computer device 60 and does not constitute a limitation on computer device 60. It may include more or fewer components than illustrated, or combine certain components, or use different components. For example, computer device may also include input / output devices, network access devices, buses, etc.

[0053] The processor 61 may be a central processing unit (CPU), or other general-purpose processors, CPUs, graphics processing units (GPUs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, quantum computing-based data processing logic units, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0054] The memory 62 can be an internal storage unit of the computer device 60, such as a hard disk or RAM of the computer device 60. The memory 62 can also be an external storage device of the computer device 60, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the computer device 60.

[0055] Furthermore, memory 62 may include both internal storage units and external storage devices of the computer device 60. Memory 62 is used to store computer programs and other programs and data required by the computer device. Memory 62 can also be used to temporarily store data that has been output or will be output.

[0056] Any references to memory, databases, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0057] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0058] Referring to Figure 3, the terminal device is a chip. In this embodiment, the chip 600 includes a processor 622, which can be one or more, and a memory 632 for storing computer programs executable by the processor 622. The computer program stored in the memory 632 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processor 622 can be configured to execute the computer program to perform the aforementioned matrix converter low-frequency side outer loop reactive power control method.

[0059] Additionally, chip 600 may also include a power supply component 626 and a communication component 650. The power supply component 626 can be configured to perform power management of chip 600, and the communication component 650 can be configured to enable communication of chip 600, such as wired or wireless communication. Furthermore, chip 600 may also include an input / output interface 658. Chip 600 can operate on an operating system stored in memory 632.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for controlling the reactive power of the outer loop on the low-frequency side of a matrix converter, characterized in that, Includes the following steps: Based on the acquired operating scenario data of the low-frequency side of the matrix converter, matching processing is performed to determine whether a reactive power control strategy is matched. If not, control ends. If a reactive power control strategy is matched, coordinate transformation processing is performed on the three-phase voltage and three-phase current data in the operating scenario data to obtain voltage-converted data and current-converted data. The actual reactive power data is calculated based on the voltage-converted data and the current-converted data. Deviation correction processing is performed between the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal. Feedforward compensation processing is then performed on the reactive power control target data to obtain a feedforward compensation signal. The feedforward compensation signal and the deviation correction signal are fused and converted to obtain a control command signal. The outer loop reactive power of the low-frequency side of the matrix converter is adjusted based on the control command signal.

2. The method for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter according to claim 1, characterized in that, The matching process based on the low-frequency side operating scenario data of the matrix converter to determine whether a reactive power control strategy is matched includes: acquiring the low-frequency side operating scenario data of the matrix converter; comparing the operating scenario data with corresponding preset thresholds to obtain comparison results; determining whether a grid connection scenario is matched based on the comparison results; if not matched, ending the control; if a grid connection scenario is matched, acquiring the status data of the circuit breaker of the matrix converter and the continuous current on the load side; if the circuit breaker is in an open state and the continuous current data is greater than or equal to 5A, then a reactive power control strategy is matched; if not matched, ending the control; wherein, the operating scenario data includes three-phase voltage data, three-phase current data, frequency data, and voltage phase data.

3. The method for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter according to claim 2, characterized in that, The three-phase voltage data and three-phase current data in the operation scenario data are subjected to coordinate transformation processing to obtain voltage transformation data and current transformation data, including: performing Clark transformation on the three-phase voltage data and three-phase current data to obtain two-phase static voltage data and two-phase static current data; performing Park transformation on the two-phase static voltage data and two-phase static current data to obtain positive sequence voltage components and positive sequence current components in the dq coordinate system; and calculating the actual reactive power data based on the positive sequence voltage components and positive sequence current components.

4. The method for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter according to claim 3, characterized in that, The calculation process for obtaining the actual reactive power data based on the positive sequence voltage component and positive sequence current component is as follows: In the formula, This is actual reactive power data. This represents the q-axis value of the positive sequence voltage. This represents the d-axis value of the positive sequence voltage. This represents the d-axis value of the positive sequence current. This represents the q-axis value of the positive sequence current.

5. The method for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter according to claim 3, characterized in that, The deviation correction signal is obtained by performing deviation correction processing based on the actual reactive power and the acquired reactive power control target data. This includes: calculating the reactive power deviation based on the actual reactive power and the acquired reactive power control target data; performing deviation correction based on the reactive power deviation to obtain a basic correction signal; acquiring the low-frequency side voltage, low-frequency side current, power frequency side voltage, and power frequency side current, calculating the bridge arm power of each bridge arm, extracting the DC component, and performing coordinate transformation on the DC component to obtain the bridge arm power imbalance component in a two-phase stationary coordinate system; determining the current compensation component based on the bridge arm power imbalance component, and obtaining the current reference value under the double αβ0 transformation after coordinate transformation; and correcting the current reference value and the basic correction signal through proportional control dynamic correction to obtain the deviation correction signal.

6. The method for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter according to claim 3, characterized in that, The reactive power control target data is processed by feedforward compensation to obtain a feedforward compensation signal, including: acquiring the reactive power control target data and the power frequency voltage on the power frequency side of the matrix converter; performing a second-order low-pass filter on the power frequency voltage to obtain a smoothed voltage; and calculating the feedforward compensation signal based on the smoothed voltage and the reactive power control target data; wherein, the calculation process of the feedforward compensation signal is as follows: In the formula, For feedforward compensation signal, To smooth the voltage, This is the target data for reactive power control.

7. The method for controlling the reactive power of the outer loop of the low-frequency side of a matrix converter according to claim 1, characterized in that, The process of fusing and converting the feedforward compensation signal and the deviation correction signal to obtain a control command signal includes: linearly fusing the feedforward compensation signal and the deviation correction signal to obtain a current control command signal on the q-axis in the dq coordinate system; inputting the current control command signal into a matrix converter to obtain the adjusted reactive power data and bridge arm capacitor voltage data of the matrix converter; comparing the adjusted reactive power data with the reactive power control target data; if the difference between the adjusted reactive power data and the reactive power control target data is >0.5kVar, then re-acquiring the operating scenario data to calculate the feedforward compensation signal and the deviation correction signal.

8. A low-frequency side outer loop reactive power control system for a matrix converter, used to implement the low-frequency side outer loop reactive power control method for a matrix converter as described in any one of claims 1 to 7, characterized in that, include: The scenario information matching and strategy generation module is configured to acquire the operating scenario information of the low-frequency side of the matrix converter, perform matching processing on the scenario information to obtain the corresponding reactive power control strategy, and collect real-time voltage data and real-time current data under the reactive power control strategy. A data processing module is configured to perform coordinate transformation processing on the real-time voltage data and the real-time current data to obtain voltage-converted data and current-converted data; a reactive power calculation module is configured to calculate actual reactive power data based on the voltage-converted data and the current-converted data; a signal generation module is configured to perform deviation correction processing on the actual reactive power and the acquired reactive power control target data to obtain a deviation correction signal, and perform feedforward compensation processing on the reactive power control target data to obtain a feedforward compensation signal; a signal processing module is configured to fuse and convert the feedforward compensation signal and the deviation correction signal to obtain a control command signal; and an execution adjustment module is configured to adjust the outer loop reactive power of the low-frequency side of the matrix converter based on the control command signal.

9. A computer device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable in the processor. When the processor executes the computer program, it implements the steps of the low-frequency side outer loop reactive power control method of the matrix converter according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the low-frequency side outer loop reactive power control method of the matrix converter according to any one of claims 1 to 7.

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