A DC bus stable control method and system for bilateral power grid coupling

Abstract

The application provides a DC bus stable control method and system for bilateral power grid coupling, and relates to the technical field of power grid control. The method comprises the following steps: collecting real-time data of the bilateral power grid to obtain a plurality of power grid information, including voltage information and power information; performing phase-locked loop processing to generate power grid phase parameters, performing coupling interaction analysis, and constructing a DC bus voltage control model; performing inner and outer loop control to generate bilateral power reference values, performing regulation and control analysis on the bilateral power grid to generate initial regulation and control signals; performing bidirectional regulation, performing incremental learning, generating bilateral power reference optimization values, dynamically correcting the initial regulation and control signals, and constructing a power grid control scheme. The application solves the technical problem that the prior art mostly uses fixed reference values for DC bus control, fails to dynamically adjust according to the actual operation state of the power grid, and reduces the regulation accuracy of the power grid, thereby affecting stability and reliability.

Description

Technical Field

[0001] This invention relates to the field of power grid control technology, specifically to a DC bus stability control method and system for dual-sided power grid coupling. Background Technology

[0002] Dual-grid coupled DC bus systems, as a highly efficient power transmission and conversion method, enable energy transfer and sharing between multiple power grids, exhibiting high efficiency and stability. However, due to factors such as changes in grid load, voltage fluctuations, and power imbalances, the stability and coordination of the dual-grid systems are often difficult to maintain. In particular, voltage fluctuations and power transmission imbalances are prone to occur during operation. If these problems are not effectively controlled and optimized, they will affect the reliability of the power grid and may even lead to the collapse of the power system.

[0003] Most existing regulation methods use fixed reference values ​​for control, failing to dynamically adjust according to the actual operating state of the power grid. Power grid load and operating conditions often change, and existing technologies cannot quickly adjust control strategies according to these changes. This deficiency means that when the operating state of the power grid changes significantly, the system's control strategy will not be able to adapt quickly, resulting in reduced regulation accuracy and affecting stability and reliability. Summary of the Invention

[0004] This application provides a DC bus stability control method and system for dual-side grid coupling, aiming to solve the technical problem that most existing technologies use fixed reference values ​​for DC bus control, which fail to make dynamic adjustments according to the actual operating state of the grid, resulting in reduced grid regulation accuracy and thus affecting stability and reliability.

[0005] The first aspect disclosed in this application provides a DC bus stability control method for dual-side grid coupling. The method includes: real-time data acquisition of both sides of the grid to obtain multiple grid information, including voltage and power information; phase-locked loop processing based on the voltage information to generate grid phase parameters; coupling and interactively analyzing the grid phase parameters with the power information to construct a DC bus voltage control model; generating dual-side power reference values ​​through inner and outer loop control of the DC bus voltage control model to perform regulation and analysis on both sides of the grid, generating an initial regulation signal; executing the initial regulation signal to bidirectionally regulate both sides of the grid, obtaining real-time operating status data and incrementally learning from the dual-side power reference values ​​to generate optimized dual-side power reference values ​​to dynamically correct the initial regulation signal, thus constructing a grid control scheme.

[0006] The second aspect of this application discloses a DC bus stability control system for dual-side grid coupling. The system is used in the aforementioned DC bus stability control method for dual-side grid coupling. The system includes: a real-time data acquisition module for real-time data acquisition from both sides of the grid, obtaining multiple grid information items, including voltage and power information; a coupling interaction analysis module for performing phase-locked loop processing based on the voltage information to generate grid phase parameters, and performing coupling interaction analysis between the grid phase parameters and the power information to construct a DC bus voltage control model; a regulation analysis module for performing inner and outer loop control through the DC bus voltage control model to generate dual-side power reference values ​​for regulation analysis of the dual-side grids, generating an initial regulation signal; and a dynamic correction module for executing the initial regulation signal to perform bidirectional regulation of the dual-side grids, obtaining real-time operating status data, backtracking to the dual-side power reference values ​​for incremental learning, generating optimized dual-side power reference values, dynamically correcting the initial regulation signal, and constructing a grid control scheme.

[0007] One or more technical solutions provided in this application have at least the following beneficial effects: By acquiring real-time data from both sides of the power grid, accurate voltage and power information can be obtained. This real-time data acquisition ensures precise monitoring of the power grid's operating status, providing a reliable foundation for subsequent control. Based on the voltage information, phase-locked loop (PLL) technology is used to generate power grid phase parameters, providing precise phase information for subsequent power regulation. By coupling and analyzing the power grid phase parameters and power information, a precise DC bus voltage control model is established. This control model, by analyzing the voltage and power relationship of the power grid, enables fine-grained regulation of the grid, ensuring stable operation. Using the established DC bus voltage control model, inner and outer loop control is implemented. The outer loop regulates the voltage, and the inner loop regulates the power. This control method generates dual-side power reference values ​​and regulates both sides of the power grid, generating initial regulation signals to further adjust the grid's operation. The implementation of control ensures the dual stability of power and voltage in the power grid. The generated initial control signal can accurately match the grid demand, avoiding voltage fluctuations and power imbalances. By incrementally learning the real-time operating data of both sides of the grid, the power reference value is continuously optimized. This incremental learning allows the grid to self-adjust and correct according to the actual operating conditions, avoiding stability problems caused by load changes or other disturbances. The optimized power reference values ​​generated by incremental learning further dynamically correct the initial control signal. This process ensures that the grid control signal always matches the actual demand, improving the accuracy of regulation. Through dynamic correction and incremental learning, the power grid control system can adaptively adjust the power reference value, enabling the grid to maintain efficient and stable operation under various environmental and load changes, avoiding slow or inaccurate response caused by overly fixed control parameters.

[0008] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0009] Figure 1 This is a schematic flowchart of a DC bus stability control method for dual-side power grid coupling provided in an embodiment of this application.

[0010] Figure 2 This is a schematic diagram of a DC bus stability control system for dual-side grid coupling provided in an embodiment of this application.

[0011] Figure labeling: Real-time data acquisition module 10, Coupled interactive analysis module 20, Control and analysis module 30, Dynamic correction module 40. Detailed Implementation

[0012] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0013] Example 1, as Figure 1 As shown, this application provides a DC bus stability control method for dual-side grid coupling, the method comprising: Real-time data acquisition is performed on both sides of the power grid to obtain multiple power grid information, including voltage information and power information.

[0014] For a dual-sided power grid, i.e., a DC bus system connecting two different power grids, real-time data acquisition is performed first. The acquired information includes voltage and power information, which is obtained through sensors or a power grid monitoring system to reflect the real-time operating status of the power grid. Among them, voltage information is an important parameter of the power grid, used to describe the potential difference in the grid. Voltage stability is crucial for the normal operation of the power system. Power information includes active power and reactive power, reflecting the load condition and transmission capacity of the power grid. Power information helps to adjust the operation mode of the power grid and ensure power balance and stability.

[0015] Based on the voltage information, a phase-locked loop is performed to generate grid phase parameters. The grid phase parameters are then coupled and interactively analyzed with the power information to construct a DC bus voltage control model.

[0016] A phase-locked loop (PLL) is an electronic feedback loop used to synchronize the frequency and phase of a signal. It tracks the phase angle of the power grid using voltage information. Since dual-sided power grids require separate processing of voltage information from both sides, two PLLs are used: one for the first grid side and the other for the second. The output of the PLL is the grid phase angle, i.e., the phase parameter of the grid voltage. The phase angle describes the time relationship between the voltage waveform and a reference signal. Coupled analysis of the grid phase parameter and power information aims to construct a DC bus voltage control model by combining voltage and power changes. In a power grid control system, the DC bus voltage control model is a mathematical model used to adjust grid power and voltage. The core objective of this model is to ensure voltage stability and meet power demands.

[0017] The DC bus voltage control model is used to perform inner and outer loop control to generate dual-side power reference values, and to perform regulation and analysis on both sides of the power grid to generate initial regulation signals.

[0018] The DC bus voltage control model comprises two control loops: an inner loop and an outer loop. The inner loop primarily handles power control, adjusting the grid's power output based on power information feedback, with the goal of regulating the actual power to a predetermined reference value. The outer loop primarily handles voltage control, stabilizing the bus voltage by adjusting the grid voltage and ensuring stable grid operation. The outer loop control provides a rapid response to voltage changes, maintaining the grid voltage within a predetermined range. Through both inner and outer loop control, dual-side power reference values ​​are generated: a rectifier-side power reference value and an inverter-side power reference value. These two reference values ​​correspond to the power demands of the grid on both sides. The rectifier-side power reference value represents the power demand input to the grid, used to control the inflow of electrical energy; the inverter-side power reference value represents the power demand output to the grid, used to control the outflow of electrical energy. Based on these dual-side power reference values, an initial control signal is generated. This signal is used to adjust the operating state of the grid on both sides, ensuring the grid operates at the required power value.

[0019] The initial control signal is executed to perform bidirectional regulation of the two-sided power grid, and real-time operating status data is obtained and backtracked to the two-sided power reference values ​​for incremental learning. The optimized two-sided power reference values ​​are generated to dynamically correct the initial control signal and construct a power grid control scheme.

[0020] Based on the generated initial control signal, bidirectional regulation is performed on both sides of the power grid. Specifically, the two sides achieve stable control of grid power and voltage through regulation on the rectifier and inverter sides. During the regulation process, real-time operating status data of the power grid is collected, including power tracking error sequences and voltage fluctuation characteristic sequences. Incremental learning, a machine learning method, is used to dynamically update the system model. It performs incremental learning based on power and voltage errors using real-time operating status data. The result of incremental learning is the generation of optimized power reference values ​​on both sides. These optimized values ​​are used to dynamically correct the initial control signal, improving control accuracy and system stability. Finally, the initial control signal is corrected using the optimized power reference values ​​to construct a power grid control scheme. This scheme can precisely control the power grid under different operating conditions, ensuring the stable and efficient operation of the power grid.

[0021] Furthermore, based on the voltage information, phase-locked loop processing is performed to generate grid phase parameters. The method includes: The voltage information is decomposed into a time sequence according to the dual-side power grid to obtain a first voltage time sequence signal on the first power grid side and a second voltage time sequence signal on the second power grid side. The dual-side power grid includes a first power grid side and a second power grid side. A phase-locked loop (PLL) is constructed, which includes a first PLL and a second PLL. The first PLL corresponds to the first voltage time sequence signal, and the second PLL corresponds to the second voltage time sequence signal. The first voltage time sequence signal is input to the first PLL, which tracks the first power grid side in real time to generate a first power grid phase angle. The second voltage time sequence signal is input to the second PLL, which tracks the second power grid side in real time to generate a second power grid phase angle. The first power grid phase angle and the second power grid phase angle are integrated to generate power grid phase parameters.

[0022] In a dual-grid system, voltage information can be viewed as voltage signals from both sides of the grid, including the first grid side and the second grid side. To better analyze and process these signals, it is necessary to decompose the voltage signals into time-series signals. In this step, the voltage information is decomposed according to the dual-grid system, and the decomposed signals are called voltage time-series signals, which reflect the changes in grid voltage over time. Specifically, the voltage information from the first grid side is extracted to form the first voltage time-series signal, which represents the voltage fluctuations of the first grid; similarly, the voltage information from the second grid side is extracted to form the second voltage time-series signal, which represents the voltage fluctuations of the second grid.

[0023] A phase-locked loop (PLL) is an electronic control loop that adjusts the phase of a system through a feedback mechanism. Its purpose is to synchronize the phase of the power grid in real time based on changes in the voltage signal. Two independent PLLs are constructed, namely a first PLL and a second PLL, for a first power grid side and a second power grid side, respectively. The first PLL receives a first voltage timing signal as input. Its function is to track the phase changes of the power grid based on the voltage waveform on the first power grid side and adjust its output to keep the power grid phase synchronized. Similarly, the second PLL receives a second voltage timing signal as input, and it also adjusts the phase of the second power grid side through a feedback mechanism to synchronize the voltage waveform on the second power grid side with the target phase.

[0024] The first voltage timing signal from the first grid side is input to the first phase-locked loop (PLL). This signal reflects the changes in the first grid voltage, and the first PLL uses this signal to track the grid phase in real time. The first PLL analyzes and processes the first voltage timing signal, adjusting its internal feedback mechanism to ensure the output signal is in phase with the input signal. This process can be considered real-time phase synchronization. The feedback loop of the PLL continuously adjusts the output phase to synchronize it with the actual phase of the grid. The output of the first PLL is the first grid phase angle, which is a phase parameter of the grid voltage signal and describes the time difference between the grid voltage and the reference signal. This phase angle is used in subsequent power control and voltage regulation processes.

[0025] The second voltage timing signal is input to the second phase-locked loop (PLL). The second PLL performs operations similar to the first PLL, analyzing and adjusting the voltage signal of the second power grid in real time. Through a feedback mechanism, the PLL adjusts its output to ensure that the phase of the output is consistent with the phase of the second power grid voltage signal. The output of the second PLL is the second power grid phase angle, which represents the phase difference between the second power grid voltage and the reference signal.

[0026] The first power grid phase angle and the second power grid phase angle are integrated. The integration process is to combine the phase angles of the two power grids to obtain a comprehensive parameter that reflects the phase relationship of the entire power grid, namely the power grid phase parameter. This power grid phase parameter is a comprehensive index used to describe the relationship between the phases of the two power grids.

[0027] Furthermore, a DC bus voltage control model is constructed by coupling and interactively analyzing the grid phase parameters and the power information, including the following methods: The power information is decomposed into two sides according to the dual-side power grid to obtain the first power information of the first power grid side and the second power information of the second power grid side; the first power information is subjected to a rotational coordinate transformation based on the phase angle of the first power grid to obtain the first active power component; the second power information is subjected to a rotational coordinate transformation based on the phase angle of the second power grid to obtain the second active power component; a DC bus voltage reference value is set based on the dual-side power grid, and the dual-side power grid is collected in real time to obtain the actual value of the DC bus voltage; the deviation between the DC bus voltage reference value and the actual value of the DC bus voltage is calculated to determine the voltage control outer loop variable parameters; based on the... A first power reference value is set based on the first power information, and a second power reference value is set based on the second power information. A first deviation value is obtained by calculating the deviation between the first active power component of the power grid and the first power reference value, and a second deviation value is obtained by calculating the deviation between the second active power component and the second power reference value. The first deviation value and the second deviation value are integrated to determine the power control inner loop variable parameters. The voltage control outer loop variable parameters are cascaded and coupled with the power control inner loop variable parameters to generate cascaded coupling parameters. Power decoupling processing is performed according to the power grid phase parameters to construct a DC bus voltage control model.

[0028] Similar to voltage information, power information is also decomposed according to the two-sided power grid. Power information includes active power and reactive power, reflecting the grid load demand and power transmission. The first power information from the first grid side serves as the power signal for the first grid, including active and reactive power data, reflecting the power demand and transmission status of the first grid. Similarly, the second power information from the second grid side serves as the power signal for the second grid, including active and reactive power data, reflecting the power demand and transmission status of the second grid.

[0029] Rotational coordinate transformation is a mathematical method used to transform power information from the original coordinate system to a coordinate system adapted to the grid phase angle. Based on the first grid phase angle, a rotational coordinate transformation is performed on the first power information to extract the active power component from the power signal. Active power is the effective power actually transmitted, capable of doing work and being consumed. The result after transformation is the first active power component, which reflects the effective power output of the first grid at the current phase angle.

[0030] Similarly, based on the phase angle of the second power grid, a rotating coordinate transformation is performed on the second power information. By aligning the phase of the power information of the second power grid, the effective power of the power grid is obtained. The result of the rotating coordinate transformation is the second active power component, which represents the effective power of the second power grid at its phase angle.

[0031] Based on the design requirements of the dual-sided power grid or the power grid stability requirements, a reference value for the DC bus voltage is set. This reference value is an ideal voltage target used to control the stability of the power grid. During actual operation, the actual value of the DC bus voltage of the power grid will deviate from the reference value due to factors such as load changes and power grid fluctuations. Therefore, the actual voltage of the dual-sided power grid is collected in real time by monitoring equipment to obtain the current actual value of the DC bus voltage.

[0032] Voltage deviation refers to the difference between the reference value and the actual value of the DC bus voltage. By calculating this voltage deviation, it is possible to identify whether the voltage deviates from the ideal value. Based on the calculated voltage deviation, outer-loop control variable parameters are generated. These parameters are used to adjust the outer-loop controller so that the voltage can be restored to the set reference value as much as possible. The outer-loop control variable is adjusted by a proportional-integral (PI) controller, which is responsible for adjustments on a longer time scale to ensure that the voltage is maintained within a stable range.

[0033] Based on the first power information, including the active and reactive power of the first power grid, a first power reference value is set. This reference value represents the desired power output on the first power grid side and is the target value for regulation. Similarly, based on the second power information, a second power reference value is set. This reference value represents the desired power output on the second power grid side.

[0034] The first deviation value is calculated by comparing the active power component of the first power grid with a first power reference value. This deviation value reflects the difference between the actual power and the target power of the first power grid and serves as the basis for adjusting the control signal. Similarly, the second deviation value is calculated by comparing the active power component of the second power grid with a second power reference value. This deviation value represents the deviation between the actual power and the target power of the second power grid and also provides a basis for the adjustment process.

[0035] To achieve unified regulation of the two-sided power grid, the first deviation value and the second deviation value are integrated. The integration process involves weighting or directly adding the two deviation values ​​to obtain a comprehensive control signal, which yields the power control inner loop variable parameters. These parameters are used to regulate the power output of the power grid. The power control inner loop ensures that the power is maintained within the desired range through high-frequency feedback regulation.

[0036] Cascade coupling the outer-loop variable parameters of voltage control with the inner-loop variable parameters of power control means that the regulation of both voltage and power control operates together within a comprehensive control framework. Cascade coupling ensures coordinated regulation of voltage and power. Through cascade coupling, cascade coupling parameters are obtained, which determine how the power grid finds a balance between voltage and power control, ensuring stable grid operation. Grid phase parameters are used to decouple the power signal. Phase differences in the grid can lead to inconsistencies in power flow and voltage changes. Decoupling separates these phase differences, ensuring that power control and voltage control do not interfere with each other. After completing these steps, a complete DC bus voltage control model is constructed. This model combines voltage and power control to ensure stable operation of both grid sides under different loads and conditions.

[0037] Furthermore, the voltage control outer loop variable parameters and the power control inner loop variable parameters are cascaded and coupled to generate cascaded coupling parameters. Power decoupling is then performed according to the grid phase parameters to construct a DC bus voltage control model. The method includes: The voltage control outer loop variable parameters are synchronized to the voltage outer loop proportional-integral controller, and a total power adjustment command is generated through proportional-integral calculation. The total power adjustment command is decomposed into a first power adjustment command and a second power adjustment command according to a preset power allocation strategy. The first power adjustment command is superimposed with a first deviation value in the power control inner loop variable parameters to generate a first inner loop comprehensive adjustment quantity. The second power adjustment command is superimposed with a second deviation value in the power control inner loop variable parameters to generate a second inner loop comprehensive adjustment quantity. The first inner loop comprehensive adjustment quantity is decoupled and compensated according to the first grid phase angle of the grid phase parameters to generate a first modulation wave signal. The second inner loop comprehensive adjustment quantity is decoupled and compensated according to the second grid phase angle of the grid phase parameters to generate a second modulation wave signal. The first modulation wave signal and the second modulation wave signal are used as the output of the DC bus voltage control model.

[0038] The voltage control outer loop variable parameters are input to the voltage outer loop proportional-integral (PI) controller. The PI controller is a standard controller used for automatic voltage regulation, adjusting the grid voltage based on voltage deviations. In the voltage outer loop PI controller, the voltage deviation undergoes both proportional (P) and integral (I) calculations. The proportional part directly amplifies the voltage deviation, providing an immediate adjustment, while the integral part accumulates past voltage deviations, generating a continuous correction to ensure the elimination of long-term deviations. Through PI calculations, a total power regulation command is generated. This command represents the overall power adjustment required to stabilize the voltage; it is a general control signal used to regulate the grid's power output.

[0039] The preset power allocation strategy is pre-set based on the grid design requirements and actual operating conditions. It determines how to allocate total power regulation commands to both sides of the grid. This strategy can be adjusted based on factors such as grid load, stability requirements, and power transmission capacity. According to the preset power allocation strategy, the total power regulation command is decomposed into two sub-commands: the first power regulation command is used to adjust the power on the first grid side; the second power regulation command is used to adjust the power on the second grid side. This decomposition ensures that the power allocation meets the actual needs of the grid while ensuring the stable operation of both grid sides.

[0040] The first power regulation command is a power regulation command generated based on the regulation signal of the outer voltage loop and the power allocation strategy. The first deviation value is a feedback signal of the inner power control loop, which represents the difference between the actual power of the first power grid and the target power. By superimposing these two values, the first inner loop comprehensive regulation amount is obtained. This comprehensive regulation amount will be used as the regulation command on the first power grid side to further adjust its power output.

[0041] The second power regulation command is used to adjust the power on the second grid side. The second deviation value is the power control inner loop feedback of the second grid, which represents the difference between the actual power and the target power of the second grid. By superimposing these two values, the comprehensive regulation amount of the second inner loop is obtained, which will serve as the regulation command on the second grid side to further adjust its power output.

[0042] Grid phase parameters describe the phase relationship between two grid sides. Phase differences in the grid affect power transmission and voltage stability. In power control systems, to avoid interference from grid phase differences on control signals, decoupling compensation is required to eliminate the impact of phase differences, thereby achieving precise power and voltage control. Decoupling compensation involves adjusting the control signals so that control operations on different grid sides do not interfere with each other. By compensating for phase angles, power fluctuations and voltage imbalances caused by grid phase differences can be eliminated.

[0043] The first inner loop comprehensive regulation is decoupled and compensated based on the first grid phase angle. Specifically, the regulation signal of the first inner loop is processed based on the first grid phase angle to eliminate the influence of phase difference on the regulation signal. After decoupling compensation, the first modulation wave signal is obtained, which is used to adjust the voltage and power on the first grid side.

[0044] The second inner loop comprehensive regulation is decoupled and compensated based on the second grid phase angle. Similarly, the regulation signal of the second inner loop is compensated based on the second grid phase angle to remove the influence of grid phase angle difference on the power regulation signal. After decoupling and compensation, the second modulation wave signal is obtained, which is used to adjust the voltage and power on the second grid side.

[0045] The first and second modulation signals represent voltage regulation and power control signals from two grid sides, respectively. These two signals are combined as the final output signal of the DC bus voltage control model, which drives the control system to adjust the voltage and power to meet the system's stability and load requirements.

[0046] Furthermore, synchronizing the voltage control outer loop variable parameters to the voltage outer loop proportional-integral controller, and generating a total power adjustment command through proportional-integral calculation, includes the following method: A voltage outer-loop proportional-integral controller is constructed, comprising a proportional branch and an integral branch. The proportional branch performs proportional calculations on the voltage control outer-loop variable parameters to obtain a proportional adjustment component. The integral branch performs cumulative integral calculations on the voltage control outer-loop variable parameters to obtain an integral adjustment component. The proportional adjustment component and the integral adjustment component are summed to generate the total power adjustment command.

[0047] A voltage outer-loop proportional-integral (PI) controller is constructed. The PI controller is a classic control system that combines proportional (P) and integral (I) control strategies to regulate voltage stability. The proportional branch adjusts based on the current voltage deviation, directly amplifying the deviation and providing an immediate response. The integral branch accumulates the voltage deviation, providing compensation for long-term deviations, ensuring the voltage recovers to the target value and eliminating long-term biases.

[0048] The proportional branch performs proportional calculations based on the variable parameters of the voltage control outer loop. The proportional calculation formula is as follows: Proportional adjustment component = K p ×Voltage deviation, K p It is a proportional gain, and the voltage deviation is the difference between the current voltage and the target voltage. Through the calculation of the proportional branch, the proportional adjustment component is obtained. This component reflects the instantaneous adjustment of the voltage deviation, requiring a rapid response and immediate correction of the voltage deviation.

[0049] The voltage deviation is integrated over time by the branch circuit to accumulate the voltage error over a period of time. The integral calculation formula is: K i This is the integral gain; the integral operation calculates the cumulative voltage deviation over time. Through the calculation of the integral branch, the integral adjustment component is obtained. This component helps eliminate long-term voltage deviations, especially when there are persistent small errors. The integral part can gradually adjust to ensure that the voltage deviation eventually disappears.

[0050] The proportional regulation component obtained from the proportional branch and the integral regulation component obtained from the integral branch are summed to obtain the final regulation amount. The total power regulation command is generated as an output signal, indicating how the power of the grid should be adjusted to keep the voltage near the target value. This command combines the current voltage error and the accumulation of historical errors.

[0051] Furthermore, the integral adjustment component is obtained by accumulating and integrating the voltage control outer loop variable parameters through the integrator branch, and the method includes: Based on the integral branch, the cumulative intensity analysis of the voltage control outer loop variable parameters is performed, and the integral coefficient is set; the voltage deviation is extracted and accumulated by integral operation to obtain the voltage deviation cumulative sum; the voltage deviation cumulative sum is multiplied by the integral coefficient to obtain the integral adjustment component.

[0052] Cumulative strength analysis analyzes the voltage deviation of the outer-loop variable parameters of voltage control to determine the intensity of the deviation's change or cumulative strength. This involves analyzing the trend of voltage deviation over time to determine its duration and magnitude. Based on this analysis, an integral coefficient is set. This constant determines the influence of the integral part on voltage regulation, and its magnitude controls the system's response to historical voltage deviations. The integral coefficient is selected through tuning to ensure the system has an appropriate response to long-term voltage deviations while avoiding over-adjustment or excessive error accumulation.

[0053] Voltage deviation refers to the difference between the actual voltage and the target voltage of the power grid, reflecting the voltage error of the power grid. The voltage deviation is extracted, accumulated over time, and then integrated. The integration process is to add the voltage deviation value at each moment with time weight to obtain the cumulative voltage deviation. The purpose of this process is to eliminate long-term deviations of the system based on the historical values ​​of voltage deviation. The result of integration can be regarded as the accumulation of voltage error over time. In this way, long-term voltage deviations can be gradually compensated.

[0054] The accumulated voltage deviation is multiplied by a set integral coefficient. This operation aims to adjust the system based on the historical accumulation of voltage deviation. The integral coefficient controls the contribution of the integral to the overall regulation, ensuring that the system can effectively adjust according to the accumulation of voltage deviation. Through this multiplication, the integral regulation component is obtained. This component is used to adjust the grid voltage, compensate for voltage instability caused by long-term deviations, and help the system restore to the target voltage value.

[0055] Furthermore, the DC bus voltage control model is used to perform inner and outer loop control to generate dual-side power reference values ​​for regulating and analyzing the dual-side power grid, generating initial regulation signals. The method includes: The first modulated wave signal is synchronized according to the first power grid phase angle to generate a first modulated wave synchronization signal; a carrier signal for both power grids is set, and the first modulated wave synchronization signal is compared with the carrier signal: S1: Extract the first signal amplitude of the first modulated wave synchronization signal, and extract the second signal amplitude of the carrier signal; S2: When the first signal amplitude is greater than the second signal amplitude, a first high-level signal is generated; S3: When the first signal amplitude is less than or equal to the second signal amplitude, a first low-level signal is generated; pulse width analysis is performed based on the first high-level signal or the first low-level signal to determine the first pulse width modulation signal; the second modulated wave signal is synchronized according to the first power grid phase angle to generate a first modulated wave synchronization signal. The second grid phase angle is synchronized to generate a second modulation wave synchronization signal; the second modulation wave synchronization signal is compared with the carrier signal: S4: the third signal amplitude of the second modulation wave synchronization signal is extracted; S5: when the third signal amplitude is greater than the second signal amplitude, a second high-level signal is generated; S6: when the third signal amplitude is less than or equal to the second signal amplitude, a second low-level signal is generated; pulse width analysis is performed based on the second high-level signal or the second low-level signal to determine the second pulse width modulation signal; based on the dual-side power reference value, the first pulse width modulation signal and the second pulse width modulation signal are adjusted and integrated to construct the initial control signal.

[0056] To ensure the first modulated wave signal matches the actual phase of the power grid, synchronization processing is required. This involves combining the phase angle of the first power grid with the first modulated wave signal to ensure that the phase of the modulated wave signal is synchronized with the phase of the power grid. Through this synchronization, the control signal for the first power grid will maintain phase consistency with the power grid. After synchronization processing, the resulting first modulated wave synchronization signal has a waveform with the same phase angle as the first power grid. This ensures that the regulation signal remains consistent with the actual operation of the power grid, facilitating precise control of the power grid's power and voltage.

[0057] The carrier signal is used for modulation and demodulation. In power control, it's used for PWM (Pulse Width Modulation) control. It's a high-frequency signal with a stable frequency and amplitude, used for comparison between the modulating wave signal and the control signal. The carrier signal is set according to the power grid frequency and system requirements, determining the signal sampling period and modulation strategy. Comparing the first modulating wave synchronization signal with the carrier signal aims to determine the switching timing of power grid regulation based on the amplitudes of the two signals. This comparison process is similar to the generation method of pulse width modulation, controlling power grid regulation by comparing signal amplitudes.

[0058] The first signal amplitude is the amplitude or maximum value of the first modulating wave synchronization signal, reflecting the strength of the modulating signal. The second signal amplitude is the amplitude or maximum value of the carrier signal, representing the strength of the carrier signal.

[0059] If the amplitude of the first signal is greater than the amplitude of the second signal, it means that the modulation signal needs to trigger a high-level output signal to generate the first high-level signal. This signal is either logic "1" or high level, indicating that the power grid needs to be regulated in response to the control signal.

[0060] If the amplitude of the first signal is less than or equal to the amplitude of the second signal, it means that the modulation signal does not need to trigger a high-level output, but continues to remain at a low level, generating a first low-level signal. This signal is logic "0" or low level, indicating that the power grid does not need to be adjusted or maintains its current state.

[0061] Based on the generated first high-level signal or first low-level signal, pulse width modulation (PWM) is performed. PWM is a control signal technique that precisely controls power or voltage output by adjusting the ratio of high-level to low-level signal durations. During PWM analysis, the duration (width) of the first high-level or first low-level signal is adjusted according to actual needs. This generates a first PWM signal, a control signal modulated by PWM, used to regulate the output power and voltage of the first power grid. The width of the PWM signal determines the amount of regulation in the power grid output; a longer high-level signal results in stronger regulation, and vice versa.

[0062] The second modulated wave signal is synchronized with the phase angle of the second power grid. This synchronization ensures that the regulation signal of the second power grid is consistent with the actual phase of the power grid. After synchronization, the resulting second modulated wave synchronization signal has a waveform consistent with the phase of the second power grid, which will be used as the control signal for subsequent regulation.

[0063] The second modulation wave synchronization signal is compared with the carrier signal. The purpose of the comparison is to determine the high and low levels of the signal, thereby adjusting the power and voltage output of the power grid.

[0064] The third signal amplitude is the amplitude of the second modulation wave synchronization signal, representing the strength of the second modulation signal. This amplitude is extracted to compare it with the amplitude of the carrier signal, thereby determining the triggering condition of the power grid regulation signal.

[0065] If the amplitude of the third signal is greater than that of the second signal, it indicates that a high-level output signal needs to be generated, thus generating a second high-level signal. The second high-level signal is either logic "1" or high level, indicating that the power grid needs to be regulated.

[0066] If the amplitude of the third signal is less than or equal to the amplitude of the second signal, it means that the adjustment signal does not need to be high, but should continue to be low, generating a second low-level signal. The second low-level signal is logic "0" or low, indicating that the power grid does not need to be adjusted at present and should maintain its current state.

[0067] Pulse width analysis is performed on the generated second high-level signal or second low-level signal. This means that a corresponding control signal is generated based on the duration of the high-level and low-level signals. A second pulse width modulation signal is determined based on the duration of the second high-level signal or second low-level signal. This signal is then modulated by PWM to match the width of the control signal with the regulation requirements of the power grid, ultimately affecting the power and voltage regulation of the second power grid.

[0068] Based on dual-side power reference values, the first pulse width modulation (PWM) signal and the second PWM signal are regulated and integrated. The purpose of this integration is to coordinate the power regulation signals of the two power grids, ensuring their cooperation and achieving overall grid balance and stability. The initial regulation signal is the final output control signal. It combines the power regulation requirements of the first and second power grids and adjusts the signals on both sides according to the dual-side power reference values ​​to adjust the power output of the grid, ensuring that voltage and power are within the expected range.

[0069] Furthermore, the method of executing the initial control signal to perform bidirectional regulation of the two-sided power grid, obtaining real-time operating status data, and incrementally learning by backtracking to the two-sided power reference values ​​to generate optimized two-sided power reference values ​​includes: The first pulse width modulation signal of the initial control signal is output to the first grid side for rectifier-side converter control to obtain a first control result; the second pulse width modulation signal of the initial control signal is output to the second grid side for inverter-side converter control to obtain a second control result; based on the first control result and the second control result, the DC bus is continuously sampled to obtain real-time operating status data, which includes a power tracking error sequence and a voltage fluctuation feature sequence; the power tracking error sequence and the voltage fluctuation feature sequence are used as incremental learning samples to backtrack to the dual-side power reference value for incremental learning to generate a dual-side power reference optimized value.

[0070] The first pulse-width modulation (PWM) signal is output to the first grid side, specifically for controlling the rectifier-side converter. The converter's function is to convert alternating current (AC) to direct current (DC), or to regulate the flow and direction of DC. The rectifier-side converter takes the received regulation signal as input and controls the current conversion or adjustment process. It adjusts the power flow on the rectifier side according to the first PWM signal to achieve stable voltage and power output. Through the regulation process, the output of the rectifier side is controlled according to the regulation signal, ultimately generating a first control result, which represents the power regulation response of the rectifier side.

[0071] A second pulse-width modulation (PWM) signal is output to the second grid side to control the inverter-side converter. The inverter's function is to convert DC to AC or regulate the output waveform of the AC. The inverter-side converter adjusts the AC output according to the received regulation signal to ensure stable voltage and power in the grid and meet the set targets. Through this regulation process, the output of the inverter side is controlled according to the regulation signal, ultimately generating a second control result to evaluate the regulation effect on the second grid side.

[0072] Based on the first and second control results, continuous data acquisition is performed on the DC bus to collect the actual operating status of the power grid. The real-time operating status data obtained through continuous data acquisition includes: a power tracking error sequence, which is the deviation data between the actual power of the power grid and the reference power, reflecting the accuracy and effectiveness of power grid control; and a voltage fluctuation characteristic sequence, which is the characteristic of the power grid voltage changing over time, reflecting the voltage fluctuation situation.

[0073] Power point tracking error sequences and voltage fluctuation feature sequences are used as incremental learning samples for incremental learning. The goal of incremental learning is to continuously adjust and optimize grid control parameters using real-time operational data. Through backtracking, real-time data is compared with dual-side power reference values, which represent the ideal power demand of the grid. Backtracking helps determine grid performance deviations. Based on the results of incremental learning, optimized dual-side power reference values ​​are generated. These optimized values ​​are used to correct and adjust the original power reference values, thereby improving the control accuracy and stability of the grid.

[0074] Furthermore, the method involves using the power tracking error sequence and the voltage fluctuation feature sequence as incremental learning samples to backtrack to the dual-side power reference values ​​for incremental learning, thereby generating optimized dual-side power reference values. Based on the power tracking error sequence and the voltage fluctuation characteristic sequence, the bilateral power reference values ​​are iteratively corrected to generate a first power reference correction amount and a second power reference correction amount; the first power reference correction amount is superimposed on the first power reference value to generate a first power reference optimized value; the second power reference correction amount is superimposed on the second power reference value to generate a second power reference optimized value; the first power reference optimized value and the second power reference optimized value are used as the bilateral power reference optimized value.

[0075] Based on the power tracking error sequence and voltage fluctuation characteristic sequence, the dual-side power reference values ​​are iteratively corrected. The purpose of this iterative correction is to adjust the power reference values ​​of the power grid according to the errors and voltage fluctuations in actual operation, ensuring that they more accurately reflect the actual needs of the power grid. Through the correction process, a first power reference correction amount and a second power reference correction amount are generated, which are used to adjust the power reference values ​​of the first and second power grids, respectively.

[0076] The obtained first power reference correction is added to the original first power reference value. Through this operation, the power reference value of the first grid is optimized based on the actual power tracking error and voltage fluctuation. After superposition, the generated first power reference optimized value will be closer to the actual needs. This optimized value is used to guide the power regulation on the first grid side, making the power output more accurate and stable.

[0077] Similarly, a second power reference correction is added to the original second power reference value. This correction is also adjusted according to the power tracking error and voltage fluctuation characteristics. Through the superposition process, the obtained second power reference optimization value ensures that the power output of the second grid meets the actual demand and is corrected according to the real-time changes in grid operation.

[0078] The first and second power reference optimization values ​​are combined to form a dual-side power reference optimization value. This value integrates the power regulation requirements of both power grids and is a power reference value optimized based on the actual operating conditions. The dual-side power reference optimization value will be used as the final power reference value input to the control system to adjust the power output of both power grids and ensure that the two power grids achieve ideal power balance and stability when operating in parallel.

[0079] Example 2 is based on the same inventive concept as the DC bus stability control method for dual-side grid coupling in the previous examples, such as... Figure 2 As shown in the figure, this application provides a DC bus stability control system for dual-side grid coupling, the system comprising: The real-time data acquisition module 10 is used to acquire real-time data from both sides of the power grid, obtaining multiple power grid information, including voltage information and power information. The coupling and interaction analysis module 20 is used to perform phase-locked loop processing based on the voltage information to generate power grid phase parameters, and to perform coupling and interaction analysis between the power grid phase parameters and the power information to construct a DC bus voltage control model. The regulation and analysis module 30 is used to perform inner and outer loop control through the DC bus voltage control model to generate dual-side power reference values ​​and to perform regulation and analysis on both sides of the power grid, generating an initial regulation signal. The dynamic correction module 40 is used to execute the initial regulation signal to perform bidirectional regulation on both sides of the power grid, obtain real-time operating status data, backtrack to the dual-side power reference values ​​for incremental learning, generate dual-side power reference optimization values, dynamically correct the initial regulation signal, and construct a power grid control scheme.

[0080] Furthermore, the coupling interaction analysis module 20 is used to perform the following operation steps: The voltage information is decomposed into a time sequence according to the dual-side power grid to obtain a first voltage time sequence signal on the first power grid side and a second voltage time sequence signal on the second power grid side. The dual-side power grid includes a first power grid side and a second power grid side. A phase-locked loop (PLL) is constructed, which includes a first PLL and a second PLL. The first PLL corresponds to the first voltage time sequence signal, and the second PLL corresponds to the second voltage time sequence signal. The first voltage time sequence signal is input to the first PLL, which tracks the first power grid side in real time to generate a first power grid phase angle. The second voltage time sequence signal is input to the second PLL, which tracks the second power grid side in real time to generate a second power grid phase angle. The first power grid phase angle and the second power grid phase angle are integrated to generate power grid phase parameters.

[0081] Furthermore, the coupling interaction analysis module 20 is used to perform the following operation steps: The power information is decomposed into two sides according to the dual-side power grid to obtain the first power information of the first power grid side and the second power information of the second power grid side; the first power information is subjected to a rotational coordinate transformation based on the phase angle of the first power grid to obtain the first active power component; the second power information is subjected to a rotational coordinate transformation based on the phase angle of the second power grid to obtain the second active power component; a DC bus voltage reference value is set based on the dual-side power grid, and the dual-side power grid is collected in real time to obtain the actual value of the DC bus voltage; the deviation between the DC bus voltage reference value and the actual value of the DC bus voltage is calculated to determine the voltage control outer loop variable parameters; based on the... A first power reference value is set based on the first power information, and a second power reference value is set based on the second power information. A first deviation value is obtained by calculating the deviation between the first active power component of the power grid and the first power reference value, and a second deviation value is obtained by calculating the deviation between the second active power component and the second power reference value. The first deviation value and the second deviation value are integrated to determine the power control inner loop variable parameters. The voltage control outer loop variable parameters are cascaded and coupled with the power control inner loop variable parameters to generate cascaded coupling parameters. Power decoupling processing is performed according to the power grid phase parameters to construct a DC bus voltage control model.

[0082] Furthermore, the coupling interaction analysis module 20 is used to perform the following operation steps: The voltage control outer loop variable parameters are synchronized to the voltage outer loop proportional-integral controller, and a total power adjustment command is generated through proportional-integral calculation. The total power adjustment command is decomposed into a first power adjustment command and a second power adjustment command according to a preset power allocation strategy. The first power adjustment command is superimposed with a first deviation value in the power control inner loop variable parameters to generate a first inner loop comprehensive adjustment quantity. The second power adjustment command is superimposed with a second deviation value in the power control inner loop variable parameters to generate a second inner loop comprehensive adjustment quantity. The first inner loop comprehensive adjustment quantity is decoupled and compensated according to the first grid phase angle of the grid phase parameters to generate a first modulation wave signal. The second inner loop comprehensive adjustment quantity is decoupled and compensated according to the second grid phase angle of the grid phase parameters to generate a second modulation wave signal. The first modulation wave signal and the second modulation wave signal are used as the output of the DC bus voltage control model.

[0083] Furthermore, the coupling interaction analysis module 20 is used to perform the following operation steps: A voltage outer-loop proportional-integral controller is constructed, comprising a proportional branch and an integral branch. The proportional branch performs proportional calculations on the voltage control outer-loop variable parameters to obtain a proportional adjustment component. The integral branch performs cumulative integral calculations on the voltage control outer-loop variable parameters to obtain an integral adjustment component. The proportional adjustment component and the integral adjustment component are summed to generate the total power adjustment command.

[0084] Furthermore, the coupling interaction analysis module 20 is used to perform the following operation steps: Based on the integral branch, the cumulative intensity analysis of the voltage control outer loop variable parameters is performed, and the integral coefficient is set; the voltage deviation is extracted and accumulated by integral operation to obtain the voltage deviation cumulative sum; the voltage deviation cumulative sum is multiplied by the integral coefficient to obtain the integral adjustment component.

[0085] Furthermore, the regulation and analysis module 30 is used to perform the following operation steps: The first modulated wave signal is synchronized according to the first power grid phase angle to generate a first modulated wave synchronization signal. A carrier signal is set for both power grids, and the first modulated wave synchronization signal is compared with the carrier signal: S1: Extract the first signal amplitude of the first modulated wave synchronization signal and extract the second signal amplitude of the carrier signal; S2: When the first signal amplitude is greater than the second signal amplitude, a first high-level signal is generated; S3: When the first signal amplitude is less than or equal to the second signal amplitude, a first low-level signal is generated; Pulse width analysis is performed based on the first high-level signal or the first low-level signal to determine a first pulse width modulation signal; The second modulated wave signal is synchronized according to the second power grid phase angle to generate a second modulated wave synchronization signal; The second modulated wave synchronization signal is compared with the carrier signal: S4: Extract the third signal amplitude of the second modulated wave synchronization signal; S5: When the third signal amplitude is greater than the second signal amplitude, a second high-level signal is generated; S6: When the third signal amplitude is less than or equal to the second signal amplitude, a second low-level signal is generated; Pulse width analysis is performed based on the second high-level signal or the second low-level signal to determine a second pulse width modulation signal; The first pulse width modulation signal and the second pulse width modulation signal are modulated and integrated based on the dual-side power reference values ​​to construct the initial modulation signal.

[0086] Furthermore, the dynamic correction module 40 is used to perform the following operation steps: The first pulse width modulation signal of the initial control signal is output to the first grid side for rectifier-side converter control to obtain a first control result; the second pulse width modulation signal of the initial control signal is output to the second grid side for inverter-side converter control to obtain a second control result; based on the first control result and the second control result, the DC bus is continuously sampled to obtain real-time operating status data, which includes a power tracking error sequence and a voltage fluctuation feature sequence; the power tracking error sequence and the voltage fluctuation feature sequence are used as incremental learning samples to backtrack to the dual-side power reference value for incremental learning to generate a dual-side power reference optimized value.

[0087] Furthermore, the dynamic correction module 40 is used to perform the following operation steps: Based on the power tracking error sequence and the voltage fluctuation characteristic sequence, the bilateral power reference values ​​are iteratively corrected to generate a first power reference correction amount and a second power reference correction amount; the first power reference correction amount is superimposed on the first power reference value to generate a first power reference optimized value; the second power reference correction amount is superimposed on the second power reference value to generate a second power reference optimized value; the first power reference optimized value and the second power reference optimized value are used as the bilateral power reference optimized value.

[0088] Through the foregoing detailed description of a DC bus stability control method for dual-side grid coupling, those skilled in the art can clearly understand that this embodiment is a DC bus stability control system for dual-side grid coupling. Since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and relevant parts can be found in the method section.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A DC bus stability control method for bilateral grid coupling, characterized in that, The method includes: Real-time data acquisition is performed on both sides of the power grid to obtain multiple power grid information, including voltage information and power information. Based on the voltage information, a phase-locked loop is performed to generate grid phase parameters. The grid phase parameters are then coupled and interactively analyzed with the power information to construct a DC bus voltage control model. The DC bus voltage control model is used to perform inner and outer loop control to generate dual-side power reference values, and to perform regulation and analysis on both sides of the power grid to generate initial regulation signals. The initial control signal is executed to perform bidirectional regulation of the two-sided power grid, and real-time operating status data is obtained and backtracked to the two-sided power reference values ​​for incremental learning. The optimized two-sided power reference values ​​are generated to dynamically correct the initial control signal and construct a power grid control scheme.

2. The DC bus stability control method for dual-sided grid coupling as described in claim 1, characterized in that, Based on the voltage information, a phase-locked loop (PLL) process is performed to generate power grid phase parameters. The method includes: The voltage information is decomposed into a time sequence according to the dual-side power grid to obtain a first voltage time sequence signal on the first power grid side and a second voltage time sequence signal on the second power grid side. The dual-side power grid includes the first power grid side and the second power grid side. A phase-locked loop is constructed, which includes a first phase-locked loop and a second phase-locked loop. The first phase-locked loop corresponds to the first voltage timing signal, and the second phase-locked loop corresponds to the second voltage timing signal. The first voltage timing signal is input to the first phase-locked loop, and the first grid side is tracked in real time through the first phase-locked loop to generate the first grid phase angle; The second voltage timing signal is input to the second phase-locked loop, and the second phase-locked loop is used to track the second grid side in real time to generate the second grid phase angle; The first grid phase angle and the second grid phase angle are integrated to generate grid phase parameters.

3. The DC bus stability control method for dual-sided grid coupling as described in claim 2, characterized in that, The method involves coupling and interactively analyzing the grid phase parameters and the power information to construct a DC bus voltage control model, including: The power information is decomposed into two sides according to the two-sided power grid to obtain the first power information of the first power grid side and the second power information of the second power grid side. Based on the first power grid phase angle, the first power information is subjected to a rotational coordinate transformation to obtain the first active power component; Based on the second grid phase angle, the second power information is subjected to a rotational coordinate transformation to obtain the second active power component; Based on the DC bus voltage reference value set by the dual-side power grid, the DC bus voltage is collected in real time by the dual-side power grid to obtain the actual value of DC bus voltage. The deviation between the reference value and the actual value of the DC bus voltage is calculated to determine the outer loop variable parameters of the voltage control. A first power reference value is set based on the first power information, a second power reference value is set based on the second power information, a first deviation value is obtained by calculating the deviation between the first active power component of the power grid and the first power reference value, and a second deviation value is obtained by calculating the deviation between the second active power component and the second power reference value. The first deviation value and the second deviation value are integrated to determine the power control inner loop variable parameters; The voltage control outer loop variable parameters and the power control inner loop variable parameters are cascaded and coupled to generate cascaded coupling parameters. Power decoupling is then performed according to the grid phase parameters to construct a DC bus voltage control model.

4. The DC bus stability control method for dual-sided grid coupling as described in claim 3, characterized in that, The voltage control outer loop variable parameters and the power control inner loop variable parameters are cascaded and coupled to generate cascaded coupling parameters. Power decoupling is then performed according to the grid phase parameters to construct a DC bus voltage control model. The method includes: The voltage control outer loop variable parameters are synchronized to the voltage outer loop proportional-integral controller, and a total power adjustment command is generated through proportional-integral calculation. The total power adjustment command is decomposed into a first power adjustment command and a second power adjustment command according to a preset power allocation strategy; The first power adjustment command is superimposed with the first deviation value in the power control inner loop variable parameters to generate the first inner loop comprehensive adjustment amount; the second power adjustment command is superimposed with the second deviation value in the power control inner loop variable parameters to generate the second inner loop comprehensive adjustment amount. The first inner loop comprehensive regulation is decoupled and compensated according to the first grid phase angle of the grid phase parameters to generate a first modulation wave signal; the second inner loop comprehensive regulation is decoupled and compensated according to the second grid phase angle of the grid phase parameters to generate a second modulation wave signal. The first modulated wave signal and the second modulated wave signal are used as the outputs of the DC bus voltage control model.

5. The DC bus stability control method for dual-sided grid coupling as described in claim 4, characterized in that, Synchronizing the voltage control outer loop variable parameters to the voltage outer loop proportional-integral controller, and generating a total power adjustment command through proportional-integral calculation, the method includes: Construct a voltage outer loop proportional-integral controller, which includes a proportional branch and an integral branch; The proportional adjustment component is obtained by proportionally calculating the voltage control outer loop variable parameters through the proportional branch. The integral adjustment component is obtained by accumulating and integrating the voltage control outer loop variable parameters through the integrator branch. The proportional adjustment component and the integral adjustment component are summed to generate the total power adjustment command.

6. The DC bus stability control method for dual-sided grid coupling as described in claim 5, characterized in that, The integral adjustment component is obtained by accumulating and integrating the voltage control outer loop variable parameters through the integrator branch, and the method includes: Based on the integral branch, the cumulative strength analysis of the voltage control outer loop variable parameters is performed, and the integral coefficient is set; Extract the voltage deviation and perform cumulative integration to obtain the cumulative sum of voltage deviations; The integral adjustment component is obtained by multiplying the cumulative voltage deviation by the integral coefficient.

7. The DC bus stability control method for dual-sided grid coupling as described in claim 4, characterized in that, The DC bus voltage control model is used to perform inner and outer loop control to generate dual-side power reference values ​​for regulating and analyzing the dual-side power grid, and to generate initial regulation signals. The method includes: The first modulated wave signal is synchronized according to the first power grid phase angle to generate a first modulated wave synchronization signal; Set the carrier signal for both power grids, and compare the first modulation wave synchronization signal with the carrier signal: S1: Extract the first signal amplitude of the first modulation wave synchronization signal, and extract the second signal amplitude of the carrier signal; S2: When the amplitude of the first signal is greater than the amplitude of the second signal, a first high-level signal is generated; S3: When the amplitude of the first signal is less than or equal to the amplitude of the second signal, a first low-level signal is generated; The first pulse width modulation signal is determined by pulse width analysis based on the first high-level signal or the first low-level signal. The second modulated wave signal is synchronized according to the second power grid phase angle to generate a second modulated wave synchronization signal; The second modulation wave synchronization signal is compared with the carrier signal: S4: Extract the third signal amplitude of the second modulation wave synchronization signal; S5: When the amplitude of the third signal is greater than the amplitude of the second signal, a second high-level signal is generated; S6: When the amplitude of the third signal is less than or equal to the amplitude of the second signal, a second low-level signal is generated; The second pulse width modulation signal is determined by pulse width analysis based on the second high-level signal or the second low-level signal. The first pulse width modulation signal and the second pulse width modulation signal are modulated and integrated based on the dual-side power reference values ​​to construct the initial modulation signal.

8. The DC bus stability control method for dual-sided grid coupling as described in claim 7, characterized in that, The method involves executing the initial control signal to perform bidirectional regulation of the power grid on both sides, obtaining real-time operating status data, and then incrementally learning the data by referencing the dual-side power reference values ​​to generate optimized dual-side power reference values. The first pulse width modulation signal of the initial control signal is output to the first power grid side for rectifier-side converter control to obtain the first control result; The second pulse width modulation signal of the initial control signal is output to the second grid side for inverter-side converter control to obtain the second control result; Based on the first control result and the second control result, the DC bus is continuously collected to obtain real-time operating status data, which includes a power tracking error sequence and a voltage fluctuation characteristic sequence. The power tracking error sequence and the voltage fluctuation feature sequence are used as incremental learning samples to backtrack to the dual-side power reference values ​​for incremental learning, thereby generating optimized dual-side power reference values.

9. The DC bus stability control method for dual-sided grid coupling as described in claim 8, characterized in that, The method involves using the power tracking error sequence and the voltage fluctuation feature sequence as incremental learning samples to backtrack to the dual-sided power reference values ​​for incremental learning, thereby generating optimized dual-sided power reference values. Based on the power tracking error sequence and the voltage fluctuation characteristic sequence, the two-sided power reference values ​​are iteratively corrected to generate a first power reference correction amount and a second power reference correction amount. The first power reference correction is superimposed on the first power reference value to generate the first power reference optimized value; The second power reference correction is superimposed on the second power reference value to generate the second power reference optimized value; The first power reference optimization value and the second power reference optimization value are used as the dual-sided power reference optimization value.

10. A DC bus stability control system for dual-sided grid coupling, characterized in that, For implementing the DC bus stability control method for dual-side grid coupling as described in any one of claims 1-9, the system comprises: The real-time data acquisition module is used to acquire real-time data from both sides of the power grid and obtain multiple power grid information, including voltage information and power information. The coupled interactive analysis module is used to perform phase-locked loop processing based on the voltage information, generate grid phase parameters, and perform coupled interactive analysis between the grid phase parameters and the power information to construct a DC bus voltage control model. The regulation and analysis module is used to perform inner and outer loop control through the DC bus voltage control model to generate dual-side power reference values, perform regulation and analysis on the dual-side power grid, and generate initial regulation signals. The dynamic correction module is used to execute the initial control signal to perform bidirectional adjustment of the two-sided power grid, obtain real-time operating status data, backtrack to the two-sided power reference values ​​for incremental learning, generate optimized two-sided power reference values ​​to dynamically correct the initial control signal, and construct a power grid control scheme.

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