A three-phase active power independent configuration method of a converter based on a minimum norm solution

Abstract

The present application relates to the technical field of energy storage, and provides a three-phase active power independent configuration method for a converter based on a minimum norm solution, constructs the correlation between three-phase current and voltage, establishes a linear equation set according to the KCL current constraint condition and the correlation, solves the linear equation set through a minimum norm solution standard algorithm, generates three-phase current sine reference values based on the output angle of a grid phase-locked loop, separates positive and negative sequence components through a signal delay method, obtains positive and negative sequence voltages by using a double-current loop feedforward decoupling control algorithm, generates voltage values through Park inverse transformation, generates PWM signals to drive the conduction or turn-off of converter power switching tubes according to the voltage values, and outputs three-phase voltages. The present application realizes independent and flexible configuration of three-phase active power and automatic minimization of reactive power, guarantees the real-time performance of control and engineering compatibility, adapts to complex scenarios such as distributed energy access and unbalanced load compensation, and improves the stability of power grid operation and energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a method for independent configuration of three-phase active power of a converter based on the minimum norm solution. Background Technology

[0002] In practical applications of three-phase grid-connected converters, the widespread access of distributed energy sources (such as residential photovoltaic and small wind power), the increasing number of unbalanced loads on the power grid (such as single-phase charging piles and asymmetrical industrial equipment), and the continuous improvement of power quality management requirements have gradually exposed the obvious limitations of traditional three-phase active power control schemes.

[0003] In traditional three-phase grid-connected converter control, total active and reactive power are typically controlled through a dual closed-loop control of positive sequence voltage and current. Power is distributed evenly across phases, preventing independent configuration of active power for each phase based on varying load demands. This deficiency leads to inflexible power allocation, increased reactive power losses, and grid instability when distributed generation, unbalanced loads, and power quality requirements are present. For example, if a distributed energy source in one phase has a high output while the other two phases have lower outputs, a uniform distribution mode results in power overflow in the high-output phase and insufficient power in the low-output phase, leading to energy waste. Furthermore, with unbalanced three-phase loads, uniformly distributed active power cannot match the load demands of each phase, easily causing power quality problems such as voltage fluctuations and current distortions, and even affecting grid stability.

[0004] Meanwhile, existing technologies often neglect the balance between reactive power optimization and real-time control when attempting to solve power imbalance problems. Some solutions prioritize active power regulation targets, allowing reactive power to fluctuate freely, leading to a decrease in the system power factor and increasing the reactive power compensation burden on the grid. Other solutions introduce complex optimization algorithms to balance active power allocation and reactive power minimization, but the algorithm iteration process is cumbersome and computationally intensive, making it difficult to adapt to high-frequency control requirements. Furthermore, they exhibit lag in response to dynamic scenarios such as load changes, further exacerbating grid operation risks. In addition, most solutions do not adequately consider compatibility with three-phase three-wire grids or place excessive demands on controller computing power, making them difficult to implement on low-cost embedded platforms and limiting the practical application of the technology.

[0005] Against this backdrop, there is an urgent need for a new control method that can achieve independent and flexible configuration of three-phase active power while automatically minimizing reactive power and ensuring real-time control and engineering compatibility, under the premise of satisfying the constraints of the power grid circuit equations. This method is designed to adapt to complex scenarios such as distributed energy access and unbalanced load compensation, thereby improving the stability of power grid operation and energy utilization efficiency. Summary of the Invention

[0006] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention provides a method for independent configuration of three-phase active power of a converter based on the minimum norm solution, which realizes independent and flexible configuration of three-phase active power, while automatically minimizing reactive power, ensuring real-time control and engineering compatibility, adapting to complex scenarios such as distributed energy access and unbalanced load compensation, and improving the stability of power grid operation and energy utilization efficiency.

[0007] This invention provides a method for independent configuration of three-phase active power of a converter based on the minimum norm solution, comprising: S1: Obtain the key input parameters of the three-phase grid-connected system, and construct the correlation between the in-phase and quadrature components of the three-phase current and voltage based on the key input parameters of the three-phase grid-connected system; S2: Establish a system of linear equations based on the KCL current constraint conditions and the correlation between the in-phase and quadrature components of the three-phase current and voltage; S3: Solve the linear equation system using the minimum norm solution standard algorithm to obtain the current amplitude and current phase angle. Based on the output angle of the grid phase-locked loop, generate three-phase current sinusoidal reference values ​​according to the current amplitude and current phase angle. S4: The positive and negative sequence components of the three-phase current after Clark transformation are separated by the signal delay method to obtain the positive and negative sequence currents. The positive and negative sequence reference currents are obtained by separating the positive and negative sequence components of the sinusoidal reference value of the three-phase current by the signal delay method. S5: A dual current loop feedforward decoupling control algorithm is used to adjust the positive and negative sequence currents and the positive and negative sequence reference currents to obtain the positive and negative sequence voltages; S6: Perform an inverse Park transform on the positive and negative sequence voltages to obtain... The voltage value in the coordinate system is used to generate a PWM signal to drive the power switch tubes of the converter to turn on or off, and output three-phase voltage.

[0008] Furthermore, the key input parameters of the three-phase grid-connected system include the target value of the three-phase active power to be configured, the real-time acquired three-phase grid voltage signal, and the grid-connected voltage.

[0009] Furthermore, solving a system of linear equations using the standard algorithm for the minimum norm solution includes: Rewrite the system of linear equations into linear constraint equations; Solve the minimum reactive power under the linear constraint equations to obtain the minimum norm solution; The current amplitude and current phase angle are calculated using the minimum norm solution.

[0010] Furthermore, the expression for calculating the sinusoidal reference value of the three-phase current is: in, for The sinusoidal reference value of phase current at time a. The amplitude of phase a current. The output angle of the power grid phase-locked loop. The angle difference between the voltage and current of phase a. for sinusoidal reference value of phase b current at time [time]. This represents the amplitude of the phase b current. The angle difference between phase b voltage and current. for sinusoidal reference value of phase c current at time . This represents the amplitude of the c-phase current. This represents the angle difference between the voltage and current of phase c.

[0011] Furthermore, the signal delay method is used when both phases are stationary. In the coordinate system, a time delay of T / 4 is introduced into the three-phase current signal after Clark transformation. The positive sequence component lags behind the phase by π / 2 after the delay, and the negative sequence component leads the phase by π / 2 after the delay. The original signal and the delayed signal are combined, and the positive sequence current component and the negative sequence current component are separated by Park coordinate transformation.

[0012] Furthermore, the signal delay method is used when both phases are stationary. In the coordinate system, a time delay of T / 4 is introduced into the three-phase current signal after Clark transformation. The positive sequence component lags behind the phase by π / 2 after the delay, and the negative sequence component leads the phase by π / 2 after the delay. The original signal and the delayed signal are combined, and the positive sequence current component and the negative sequence current component are separated by Park coordinate transformation.

[0013] Furthermore, the calculation expressions for the positive and negative sequence current components are as follows: in, This represents the direct-axis component of the positive-sequence current. This represents the quadrature-axis component of the positive-sequence current. This represents the direct-axis component of the negative-sequence current. This is the quadrature-axis component of the negative-sequence current. for time coordinate system shaft current, for time Delay in coordinate system After shaft current, for time Delay in coordinate system After shaft current, for time coordinate system shaft current, Angular frequency, The period is the current signal period.

[0014] Furthermore, step S5 includes: S51: Transform the positive and negative sequence currents to the dq coordinate system using the Park transformation to obtain the positive and negative sequence dq axis currents; S52: Transform the positive and negative sequence reference currents to the dq coordinate system using the Park transformation to obtain the positive and negative sequence dq axis reference currents; S53: A dual current loop feedforward decoupling control algorithm is used to independently adjust the positive and negative sequence dq-axis currents to obtain positive and negative sequence voltages.

[0015] This invention also provides a converter three-phase active power independent configuration system based on the minimum norm solution, for executing the above-mentioned converter three-phase active power independent configuration method based on the minimum norm solution, including: The first construction module obtains the key input parameters of the three-phase grid-connected system and constructs the correlation relationship between the in-phase components and quadrature components of the three-phase current and voltage based on the key input parameters of the three-phase grid-connected system. The second construction module establishes a system of linear equations based on the KCL current constraint conditions and the correlation between the in-phase and quadrature components of the three-phase current and voltage. The minimum norm solution module solves the linear equation system using the minimum norm solution standard algorithm to obtain the current amplitude and current phase angle. Based on the output angle of the grid phase-locked loop, it generates a three-phase current sinusoidal reference value according to the current amplitude and current phase angle. The positive and negative sequence separation module separates the positive and negative sequence components of the three-phase current after Clark transformation by using the signal delay method to obtain the positive and negative sequence current. It also separates the positive and negative sequence components of the sinusoidal reference value of the three-phase current by using the signal delay method to obtain the positive and negative sequence reference current. The feedforward decoupling module uses a dual current loop feedforward decoupling control algorithm to adjust the positive and negative sequence currents and the positive and negative sequence reference currents to obtain positive and negative sequence voltages. The voltage output module performs a Park inverse transform on the positive and negative sequence voltages to obtain... The voltage value in the coordinate system is used to generate a PWM signal to drive the power switch tubes of the converter to turn on or off, and output three-phase voltage.

[0016] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the above-described method for independent configuration of three-phase active power of a converter based on a minimum norm solution.

[0017] The present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for independent configuration of three-phase active power of a converter based on a minimum norm solution.

[0018] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: This invention effectively addresses the pain points of traditional three-phase grid-connected converter control schemes. On one hand, it enables independent configuration of three-phase active power, flexibly adapting to situations with significant differences in energy output between phases in distributed energy access scenarios and varying load demands in unbalanced load compensation scenarios, avoiding energy waste and grid instability caused by traditional uniform distribution modes. On the other hand, by optimizing the current reference value through the minimum norm solution, it automatically minimizes reactive power while meeting the three-phase active power target, significantly improving the system power factor, reducing reactive power losses, and thus improving overall system operating efficiency. Furthermore, this control method possesses uniqueness and analytical solvability, requiring no complex iterative calculations. Its computational logic is simple and clear, facilitating implementation on low-cost embedded controllers and lowering the hardware deployment threshold. It also exhibits good compatibility with existing three-phase grid-connected converter topologies, allowing direct integration and application without large-scale hardware modifications, significantly reducing engineering modification and promotion costs. It has strong engineering scalability and can quickly adapt to various practical application scenarios such as distributed energy access, power quality management, and unbalanced load compensation, providing strong support for stable grid operation and efficient energy utilization.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a flowchart illustrating a method for independent configuration of three-phase active power of a converter based on the minimum norm solution provided by the present invention.

[0022] Figure 2 This is a schematic diagram of the positive and negative order separation method based on DSC provided by the present invention.

[0023] Figure 3 This is a block diagram of the current loop control in the positive and negative sequence rotating coordinate system provided by the present invention.

[0024] Figure 4 This is a schematic diagram of the three-phase reference current generated by the minimum norm solution provided in the embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the actual three-phase current on the AC side provided in an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of three-phase active power provided in an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of three-phase reactive power provided in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of a converter with independent configuration of three-phase active power based on the minimum norm solution provided by the present invention.

[0029] Figure 9 This is a block diagram of the electronic device provided by the present invention.

[0030] Figure label: 101. First building module; 102. Second building module; 103. Minimum norm solution module; 104. Positive and negative order separation module; 105. Feedforward decoupling module; 106. Voltage output module; 201. Processor; 202. Communication bus; 203. Communication interface; 204. Memory. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The following embodiments are used to illustrate this invention but cannot be used to limit the scope of this invention.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0033] The following is combined with Figures 1 to 9 This invention describes a method for independent configuration of three-phase active power in a converter based on the minimum norm solution.

[0034] like Figure 1 As shown, a method for independent configuration of three-phase active power of a converter based on the minimum norm solution includes: S1: Obtain the key input parameters of the three-phase grid-connected system, and construct the correlation between the in-phase and quadrature components of the three-phase current and voltage based on the key input parameters of the three-phase grid-connected system; Key input parameters include the target value of the three-phase active power to be configured, the real-time acquired three-phase grid voltage signal, and the grid-connected voltage. Based on the active power definition, the in-phase / quadrature component relationship between current and voltage is defined, and the calculation expression is as follows: , , , in, Let A represent the direct-axis components of the current and voltage in phase a. The target value for active power in phase a. For grid connection voltage, The amplitude of phase a current. The angle difference between the voltage and current of phase a. Let be the cross-axis components of the phase a current and voltage. For phase a, the reactive power is... Let be the direct-axis components of the phase b current and voltage. This represents the target value for the active power of phase b. This represents the amplitude of the phase b current. The angle difference between phase b voltage and current. For the cross-axis components of phase b current and voltage, For phase b reactive power, For the direct-axis components of phase c current and voltage, This represents the target value for the active power of phase c. This represents the amplitude of the c-phase current. The angle difference between the voltage and current of phase c. For the cross-axis components of the c-phase current and voltage, This represents the reactive power of phase c.

[0035] S2: Establish a system of linear equations based on the KCL current constraint conditions and the correlation between the in-phase and quadrature components of the three-phase current and voltage; The KCL current constraint condition is: in, This refers to the phase a current on the AC side of the converter. This refers to the phase b current on the AC side of the converter. This refers to the c-phase current on the AC side of the converter. And minimize reactive power under this constraint.

[0036] Combining the relationships between the in-phase and quadrature components of current and voltage, the three-phase currents a, b, and c can be expressed as: in, Angular frequency, For time, The imaginary unit, To take the imaginary part of a complex number; Substituting this into the KCL current constraint conditions yields the following linear equation system: S3: Solve the linear equation system using the minimum norm solution standard algorithm to obtain the current amplitude and current phase angle. Based on the output angle of the grid phase-locked loop, generate three-phase current sinusoidal reference values ​​according to the current amplitude and current phase angle. Rewrite the system of linear equations into linear constraint equations; Write the system of linear equations in matrix form: in, The coefficient matrix, For constant terms, Let be the column vector to be solved; , If we take the transpose of the matrix, then: Given a three-phase active power, minimizing reactive power can be equivalently expressed as finding... In linear constraints The minimum norm solution is given by the standard formula: in, It is the minimum norm solution.

[0037] Substituting into the standard formula for the least norm solution, we get: The current amplitude is: The current phase angle is: The output angle of the power grid phase-locked loop Based on this, sinusoidal reference values ​​for the three-phase current are generated, and the calculation expression is as follows: in, for The sinusoidal reference value of phase current at time a. The amplitude of phase a current. The output angle of the power grid phase-locked loop. The angle difference between the voltage and current of phase a. for sinusoidal reference value of phase b current at time [time]. This represents the amplitude of the phase b current. The angle difference between phase b voltage and current. for sinusoidal reference value of phase c current at time . This represents the amplitude of the c-phase current. This represents the angle difference between the voltage and current of phase c.

[0038] S4: The positive and negative sequence components of the three-phase current after Clark transformation are separated by the signal delay method to obtain the positive and negative sequence currents. The positive and negative sequence reference currents are obtained by separating the positive and negative sequence components of the three-phase current reference values ​​by the signal delay method. like Figure 2 As shown, the signal delay method (DSC) is used when both phases are stationary. In the coordinate system, for Clark transformation ( The three-phase current signal after the delay is introduced with a time delay of T / 4 (5ms, corresponding to 50Hz power frequency). Utilizing the characteristics that the positive-sequence component lags behind by π / 2 after the delay and the negative-sequence component leads by π / 2 after the delay, the original signal and the delayed signal are combined, and then transformed using Park coordinates (…). or The positive-sequence current component and the negative-sequence current component are separated to achieve accurate separation in a three-phase three-wire system without zero-sequence component. The results of the positive and negative-sequence current components are as follows: in, This represents the direct-axis component of the positive-sequence current. This represents the quadrature-axis component of the positive-sequence current. This represents the direct-axis component of the negative-sequence current. This is the quadrature-axis component of the negative-sequence current. for time coordinate system shaft current, for time Delay in coordinate system After shaft current, for time Delay in coordinate system After shaft current, for time coordinate system shaft current; The three-phase sinusoidal current reference values ​​obtained by the minimum norm solution are also separated using the signal delay method. The separated positive-sequence current components are then transformed into the positive-sequence synchronous rotating dq coordinate system using the Park transform, resulting in... , The negative sequence current component is transformed into the negative sequence synchronously rotating dq coordinate system through the Park transformation, resulting in... , .

[0039] S5: A dual current loop feedforward decoupling control algorithm is used to adjust the positive and negative sequence currents and the positive and negative sequence reference currents to obtain the positive and negative sequence voltages; like Figure 3 As shown, a dual-current-loop feedforward decoupling control algorithm is used to independently adjust the positive and negative sequence dq-axis currents: Positive sequence coordinate system feedforward decoupling formula: in, This represents the direct-axis component of the positive-sequence voltage. The positive sequence voltage quadrature axis component, This is a positive-sequence direct-axis voltage command. This is a positive-sequence quadrature-axis voltage command. For the proportional gain of the current controller, The integral gain of the current controller. This is the reference value for the direct-axis component of the positive-sequence current. This is the reference value for the quadrature-axis component of the positive-sequence current. It is a positive-sequence direct-axis cross-coupled voltage. This is a positive-sequence quadrature-axis cross-coupled voltage. Angular frequency, For filtering inductors; Negative order coordinate system feedforward decoupling formula: in, This represents the direct-axis component of the negative-sequence voltage. This is the quadrature-axis component of the negative-sequence voltage. It is a negative-sequence direct-axis cross-coupled voltage. It is a negative sequence cross-axis cross-coupled voltage. This is a negative-sequence direct-axis voltage command. This is a negative sequence quadrature-axis voltage command. This is the reference value for the direct-axis component of the negative-sequence current. This is a reference value for the quadrature axis component of the negative sequence current; By introducing a cross-coupling term, the effects of inter-dq axis coupling are eliminated. , , , The four sets of current commands are completely independently controlled, and good dynamic and static performance can be obtained. The control block diagram is as follows: Figure 3 As shown.

[0040] S6: Perform an inverse Park transform on the positive and negative sequence voltages to obtain... The voltage value in the coordinate system is used to generate a PWM signal to drive the power switch tubes of the converter to turn on or off, and output three-phase voltage.

[0041] Performing an inverse Park transform on the positive-sequence voltage yields... Positive sequence voltage values ​​in a coordinate system, including positive sequence voltage Axial components Positive sequence voltage Axial components ; Performing an inverse Park transform on the negative-sequence voltage yields... Negative sequence voltage value in coordinate system, negative sequence voltage Axial components Negative sequence voltage Axial components ; Will and Add them together to get shaft voltage value ;Will and Add them together to get shaft voltage value ; and Six PWM signals are generated using SVPWM to drive the power switching transistors of the converter to turn on / off, thereby achieving three-phase voltage output.

[0042] This invention obtains key input parameters of a three-phase grid-connected system, including the target value of the three-phase active power to be configured. , , The system collects real-time three-phase grid voltage signals; constructs the correlation between the in-phase and quadrature components of the three-phase current and voltage based on the definition of active power, and introduces KCL current constraints to establish a set of linear equations with the three-phase current reference value as the solution objective; solves the above linear equations using the minimum norm solution standard algorithm, and derives the analytical expressions for the peak amplitude and phase angle of each phase current through matrix operations, ensuring that reactive power is minimized while satisfying the active power target and current constraints; using the grid voltage phase angle output by the phase-locked loop as a reference, and combining the peak value and phase angle of each phase current obtained from the solution, a three-phase current reference signal conforming to the sinusoidal law is generated. This signal is directly used as the input reference for subsequent positive and negative sequence separation and current loop control, providing a precise current control basis for independent configuration of three-phase active power.

[0043] This invention effectively addresses the pain points of traditional three-phase grid-connected converter control schemes. Firstly, it enables independent configuration of three-phase active power, flexibly adapting to situations with significant differences in energy output across phases under distributed energy access scenarios and varying load demands across phases under unbalanced load compensation scenarios, avoiding energy waste and grid instability caused by traditional uniform distribution modes. Secondly, by optimizing the current reference value through the minimum norm solution, it automatically minimizes reactive power while meeting the three-phase active power target, significantly improving the system power factor, reducing reactive power losses, and thus enhancing overall system operating efficiency. Furthermore, this control method possesses uniqueness and analytical solvability, requiring no complex iterative calculations. Its computational logic is simple and clear, facilitating implementation on low-cost embedded controllers and lowering the hardware deployment threshold. It also exhibits good compatibility with existing three-phase grid-connected converter topologies, allowing direct integration and application without large-scale hardware modifications, significantly reducing engineering modification and promotion costs. It possesses strong engineering scalability and can quickly adapt to various practical application scenarios such as distributed energy access, power quality management, and unbalanced load compensation, providing strong support for stable grid operation and efficient energy utilization.

[0044] To verify the feasibility and dynamic performance of this invention, a complete grid-connected converter control simulation model was built on the MATLAB / Simulink platform. The system mainly consists of a three-phase current reference value calculation module, a fundamental positive-to-negative sequence separation module based on the signal delay method, and a dual current loop control and SVPWM signal generation module. The functions of each module are as follows: The three-phase current reference value calculation module is the core front-end module of the system control. Its main function is to accurately calculate the instantaneous reference values ​​of the current in each phase based on the given three-phase active power reference values. The input parameters of this module include the three-phase active power reference values. , , and the output angle of the power grid phase-locked loop The output is the reference value for the three-phase current.

[0045] The fundamental positive and negative sequence separation module is one of the key components for achieving independent active power configuration, and its core principle is based on the signal delay method (DSC). In a three-phase three-wire power system, since there is no zero-sequence component, the three-phase currents are stationary in two phases. In a coordinate system, it can be represented as a superposition of positive and negative order components. The DSC method, through... A time delay of T / 4 is introduced into the two-axis signal (T / 4 = 5ms for 50Hz power frequency), and separation is achieved by utilizing the phase response characteristics of the positive and negative sequence components.

[0046] Specifically, the three-phase alternating current, after Clark transformation, is input into a specific transfer function G(s). This transfer function has an amplitude-frequency response of 1 at the fundamental frequency of 50Hz, ensuring no attenuation of the fundamental component's amplitude. Its phase-frequency response characteristics cause the positive-sequence component to lag by π / 2, while the negative-sequence component, under the same delay condition, leads by π / 2, forming a significant phase-distinguishing feature. Based on this phase characteristic, by combining the original signal and the delayed signal in a specific manner and performing coordinate transformation, the positive and negative-sequence components can be effectively separated.

[0047] The separated positive-sequence signal is transformed into a positive-sequence synchronously rotating dq coordinate system using the Park transform, resulting in... , Real-time value; simultaneously, the negative-sequence signal is transformed into a negative-sequence synchronously rotating dq coordinate system via Park transform, resulting in... , Real-time values ​​are obtained, thereby achieving complete decoupling of positive and negative sequence components, laying the foundation for independent control of the subsequent dual current loop.

[0048] The dual current loop control and SVPWM signal generation module is the core control and execution component of the system, responsible for generating the final inverter drive signal based on the positive and negative sequence current reference values. This module uses the positive and negative sequence dq-axis current reference values... , , , As input, a dual current loop feedforward decoupling control algorithm is used to independently control the positive-sequence and negative-sequence currents respectively.

[0049] In the positive and negative sequence rotating coordinate system, the feedforward decoupling control algorithm eliminates the coupling effect between the dq axes by introducing compensation for cross-coupling terms, giving the inner current loop good dynamic response and anti-interference capability. After the dual current loop control algorithm is executed, the positive sequence dq voltage command and the negative sequence dq voltage command are obtained. Adding these two commands together converts the system to a two-phase stationary state. coordinate system, to obtain and Voltage command. Finally, SVPWM modulation is used to... The voltage command in the coordinate system is converted into six PWM drive signals to control the on and off of the power switching devices of the converter, so as to achieve the desired voltage output.

[0050] To verify the actual effect of the three-phase active power independent configuration control strategy, the reference values ​​of the three-phase active power (a, b, and c) were set to 14kW, 10kW, and 8kW respectively in the simulation model. Under this unbalanced operating condition, the system's active power can reach the set value, realizing the independent configuration of the three-phase active power. The three-phase current reference values ​​generated by the minimum norm solution are as follows: Figure 4 As shown, the actual three-phase current on the AC side at this time is as follows: Figure 5 As shown, by Figure 4 and Figure 5 It can be seen that the actual current waveform is stable and the phase is consistent with the reference value, indicating that the feedforward decoupling control of the dual current loop effectively eliminates dq-axis coupling interference, achieves accurate tracking of the reference current, and provides current-level assurance for the active power to reach the set value. Figure 6 As shown, the active power of the three phases a, b, and c eventually reaches the set value. Figure 6 In the experiment, the active power of phases a, b, and c closely matches the set value. Therefore, under conditions of unbalanced three-phase active power, this invention achieves the core requirement of independent configuration and non-interference of active power for each phase, verifying the collaborative effectiveness of the minimum norm solution algorithm and the positive / negative sequence separation module. Figure 7 As shown, this invention focuses on the independent configuration of active power without causing abnormal fluctuations in reactive power, thus avoiding the sacrifice of power quality due to active power control.

[0051] like Figure 8 As shown, a converter three-phase active power independent configuration system based on the minimum norm solution is used to execute the aforementioned converter three-phase active power independent configuration method based on the minimum norm solution, including: The first construction module 101 obtains the key input parameters of the three-phase grid-connected system and constructs the correlation relationship between the in-phase components and quadrature components of the three-phase current and voltage based on the key input parameters of the three-phase grid-connected system. The second construction module 102 establishes a system of linear equations based on the KCL current constraint conditions and the correlation between the in-phase and quadrature components of the three-phase current and voltage. The minimum norm solution module 103 solves the linear equation system through the minimum norm solution standard algorithm to obtain the current amplitude and current phase angle. Based on the output angle of the grid phase-locked loop, it generates three-phase current sinusoidal reference values ​​according to the current amplitude and current phase angle. The positive and negative sequence separation module 104 separates the positive and negative sequence components of the three-phase current after Clark transformation by using the signal delay method to obtain the positive and negative sequence current. It also separates the positive and negative sequence components of the sinusoidal reference value of the three-phase current by using the signal delay method to obtain the positive and negative sequence reference current. The feedforward decoupling module 105 uses a dual current loop feedforward decoupling control algorithm to adjust the positive and negative sequence currents and the positive and negative sequence reference currents to obtain positive and negative sequence voltages. Voltage output module 106 performs Park inverse transformation on positive and negative sequence voltages to obtain The voltage value in the coordinate system is used to generate a PWM signal to drive the power switch tubes of the converter to turn on or off, and output three-phase voltage.

[0052] Through the coordinated operation of the above modules, this invention can effectively solve the pain points of traditional three-phase grid-connected converter control schemes. On the one hand, it can realize the independent configuration of three-phase active power, flexibly adapting to the situation where the energy output of each phase is large in the distributed energy access scenario and the load demand of each phase is different in the unbalanced load compensation scenario, avoiding the energy waste and grid instability caused by the traditional uniform distribution mode. On the other hand, by optimizing the current reference value through the minimum norm solution, it can automatically minimize reactive power while meeting the three-phase active power target, greatly improving the system power factor, reducing reactive power loss, and thus improving the overall system operating efficiency. Meanwhile, this control method possesses uniqueness and analytical solvability, requiring no complex iterative calculations. Its computational logic is simple and clear, facilitating implementation on low-cost embedded controllers and lowering the hardware deployment threshold. Furthermore, it exhibits good compatibility with existing three-phase grid-connected converter topologies, allowing for direct integration and application without large-scale modifications to the converter hardware. This significantly reduces engineering modification and promotion costs, demonstrating strong engineering scalability. It can quickly adapt to various practical application scenarios such as distributed energy access, power quality management, and unbalanced load compensation, providing strong support for stable grid operation and efficient energy utilization.

[0053] Figure 9 An example is a block diagram of an electronic device, such as... Figure 9 As shown, the electronic device may include a processor 201, a communication interface 203, a memory 204, and a communication bus 202. The processor 201, communication interface 203, and memory 204 communicate with each other via the communication bus 202. The processor 201 can call logic instructions from the memory 204 to execute a converter three-phase active power independent configuration method based on the minimum norm solution.

[0054] Furthermore, the logical instructions in the aforementioned memory 204 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0055] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, and when the program instructions are executed by a computer, the computer is able to execute a converter three-phase active power independent configuration method based on the minimum norm solution provided by the above methods.

[0056] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for independent configuration of three-phase active power of a converter based on a minimum norm solution provided by the above methods.

[0057] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0058] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for independent configuration of three-phase active power in a converter based on the minimum norm solution, characterized in that, include: S1: Obtain the key input parameters of the three-phase grid-connected system, and construct the correlation between the in-phase and quadrature components of the three-phase current and voltage based on the key input parameters of the three-phase grid-connected system; S2: Establish a system of linear equations based on the KCL current constraint conditions and the correlation between the in-phase and quadrature components of the three-phase current and voltage; S3: Solve the linear equation system using the minimum norm solution standard algorithm to obtain the current amplitude and current phase angle. Based on the output angle of the grid phase-locked loop, generate three-phase current sinusoidal reference values ​​according to the current amplitude and current phase angle. S4: The positive and negative sequence components of the three-phase current after Clark transformation are separated by the signal delay method to obtain the positive and negative sequence currents. The positive and negative sequence reference currents are obtained by separating the positive and negative sequence components of the sinusoidal reference value of the three-phase current by the signal delay method. S5: A dual current loop feedforward decoupling control algorithm is used to adjust the positive and negative sequence currents and the positive and negative sequence reference currents to obtain the positive and negative sequence voltages; S6: Perform an inverse Park transform on the positive and negative sequence voltages to obtain... The voltage value in the coordinate system is used to generate a PWM signal to drive the power switch tubes of the converter to turn on or off, and output three-phase voltage.

2. The method for independent configuration of three-phase active power of a converter based on the minimum norm solution according to claim 1, characterized in that, The key input parameters of the three-phase grid-connected system include the target value of the three-phase active power to be configured, the real-time acquired three-phase grid voltage signal, and the grid-connected voltage.

3. The method for independent configuration of three-phase active power of a converter based on the minimum norm solution according to claim 1, characterized in that, Solving systems of linear equations using the standard algorithm with minimum norm includes: Rewrite the system of linear equations into linear constraint equations; Solve the minimum reactive power under the linear constraint equations to obtain the minimum norm solution; The current amplitude and current phase angle are calculated using the minimum norm solution.

4. The method for independent configuration of three-phase active power of a converter based on the minimum norm solution according to claim 1, characterized in that, The formula for calculating the sinusoidal reference value of three-phase current is: in, for The sinusoidal reference value of phase current at time a. The amplitude of phase a current. The output angle of the power grid phase-locked loop. The angle difference between the voltage and current of phase a. for sinusoidal reference value of phase b current at time . This represents the amplitude of the phase b current. The angle difference between phase b voltage and current. for sinusoidal reference value of phase c current at time . The magnitude of phase c current. This represents the angle difference between the voltage and current of phase c.

5. The method for independent configuration of three-phase active power of a converter based on the minimum norm solution according to claim 1, characterized in that, The signal delay method is used when both phases are stationary. In the coordinate system, a time delay of T / 4 is introduced into the three-phase current signal after Clark transformation. The positive sequence component lags behind the phase by π / 2 after the delay, and the negative sequence component leads the phase by π / 2 after the delay. The original signal and the delayed signal are combined, and the positive sequence current component and the negative sequence current component are separated by Park coordinate transformation.

6. The method for independent configuration of three-phase active power of a converter based on the minimum norm solution according to claim 1, characterized in that, The calculation expressions for the positive and negative sequence current components are as follows: in, This represents the direct-axis component of the positive-sequence current. This represents the quadrature-axis component of the positive-sequence current. This represents the direct-axis component of the negative-sequence current. This is the quadrature-axis component of the negative-sequence current. for time coordinate system shaft current, for time Delay in coordinate system After shaft current, for time Delay in coordinate system After shaft current, for time coordinate system shaft current, Angular frequency, The period is the current signal period.

7. The method for independent configuration of three-phase active power of a converter based on the minimum norm solution according to claim 1, characterized in that, The S5 steps include: S51: Transform the positive and negative sequence currents to the dq coordinate system using the Park transformation to obtain the positive and negative sequence dq axis currents; S52: Transform the positive and negative sequence reference currents to the dq coordinate system using the Park transformation to obtain the positive and negative sequence dq axis reference currents; S53: A dual current loop feedforward decoupling control algorithm is used to independently adjust the positive and negative sequence dq-axis currents to obtain positive and negative sequence voltages.

8. A converter three-phase active power independent configuration system based on minimum norm solution, characterized in that, To implement the converter three-phase active power independent configuration method based on the minimum norm solution as described in any one of claims 1 to 7, comprising: The first construction module obtains the key input parameters of the three-phase grid-connected system and constructs the correlation relationship between the in-phase components and quadrature components of the three-phase current and voltage based on the key input parameters of the three-phase grid-connected system. The second construction module establishes a system of linear equations based on the KCL current constraint conditions and the correlation between the in-phase and quadrature components of the three-phase current and voltage. The minimum norm solution module solves the linear equation system using the minimum norm solution standard algorithm to obtain the current amplitude and current phase angle. Based on the output angle of the grid phase-locked loop, it generates a three-phase current sinusoidal reference value according to the current amplitude and current phase angle. The positive and negative sequence separation module separates the positive and negative sequence components of the three-phase current after Clark transformation by using the signal delay method to obtain the positive and negative sequence current. It also separates the positive and negative sequence components of the sinusoidal reference value of the three-phase current by using the signal delay method to obtain the positive and negative sequence reference current. The feedforward decoupling module uses a dual current loop feedforward decoupling control algorithm to adjust the positive and negative sequence currents and the positive and negative sequence reference currents to obtain positive and negative sequence voltages. The voltage output module performs a Park inverse transform on the positive and negative sequence voltages to obtain... The voltage value in the coordinate system is used to generate a PWM signal to drive the power switch tubes of the converter to turn on or off, and output three-phase voltage.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for independent configuration of three-phase active power of a converter based on the minimum norm solution as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for independent configuration of three-phase active power of a converter based on the minimum norm solution as described in any one of claims 1 to 7.

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