Power optimization control method and system for grid-connected converter based on improved VOC

Abstract

The present invention discloses a power optimization control method and system for a grid-connected converter based on an improved VOC, relating to the technical field of grid-connected converter control. The method comprises: obtaining the output voltage, current, and angular frequency of a three-phase grid-connected converter in real time; calculating a current deviation value based on the output voltage and output current, scaling the current deviation value, and then multiplying the current deviation value by an adaptive rotation angle matrix to obtain a current source and a voltage source; adaptively and dynamically adjusting the rotation angle based on the output voltage and output angular frequency to change the changing trends of the voltage and angular frequency, thereby decoupling active power and reactive power; inputting the current source and voltage source into a virtual oscillation controller to output the inductor current and capacitor voltage, scaling the voltage to obtain a voltage adjustment value, and then performing PWM modulation to obtain a converter switch control signal, thereby achieving stable control of the converter output power. The present invention can ensure accurate tracking of the voltage and frequency at the grid connection point and the output power of the grid-connected converter.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected converter control, and in particular to a grid-connected converter power optimization control method and system based on improved VOC. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the increasing problems of environmental pollution and fossil energy depletion, clean and renewable energy sources such as solar and wind power have garnered widespread attention, and the proportion of renewable energy connected to the grid has gradually increased. However, because distributed generation is often located in remote areas, transmission lines are long and transformers are numerous, resulting in weak grid characteristics. Furthermore, as the proportion of distributed generation increases, multiple converters are often operated in parallel to meet load requirements. Under these conditions, the equivalent grid impedance of a single converter increases, and the grid's weak grid characteristics become apparent. This weak grid-induced curtailment of wind and solar power, as well as grid failures, is frequent. Furthermore, the intermittent, random, and fluctuating output of high-penetration renewable energy generation often leads to significant fluctuations in grid impedance and strength, seriously threatening the safe and stable operation of the grid and renewable energy generation systems. Therefore, grid-connected converters and their control strategies are being introduced in renewable energy generation systems such as micro-energy, distributed generation, energy storage, and AC / DC microgrids to achieve stable system operation.

[0004] Traditional grid-connected converters primarily employ either grid-following control or grid-forming control. Grid-following control regulates active and reactive power output based on grid phase, making it suitable for strong grids. However, in weak grids, stability margins are reduced, potentially causing harmonic resonance and even instability. Grid-forming control directly regulates output power by controlling the output voltage vector phase, making it more stable in weak grids but unstable in strong ones. In other words, traditional grid-following control and grid-forming control, respectively, exhibit poor stability in weak and strong grids, respectively, and both struggle to adapt to varying grid strength conditions. Furthermore, traditional grid-forming control also suffers from power tracking issues, potentially leading to reduced efficiency in renewable energy grid-connected systems.

[0005] Existing technologies already utilize virtual oscillator control (VOC) strategies for grid-connected converters with renewable energy generation under conditions of significant fluctuations in grid strength and high penetration. These strategies, based on the dynamic characteristics of the Andronov-Hopf oscillator (AHO), provide stable voltage and frequency outputs in both strong and weak grids. However, this approach primarily utilizes static parameter designs with fixed rotation angles, resulting in inherent coupling between active and reactive power regulation and the inability to independently track power commands. This can lead to significant deviations between the converter's actual output power and the reference command, potentially causing frequency and voltage instability, reduced power generation revenue, and limited renewable energy consumption. This makes it impossible to achieve both stable and economical system control. Summary of the Invention

[0006] In order to address the deficiencies of the above-mentioned prior art, the present invention provides a power optimization control method and system for a grid-connected converter based on an improved VOC, establishes a converter control architecture based on a virtual oscillator, and designs a power optimization control method based on an adaptive rotation angle on the basis of the architecture, which can achieve fast and smooth correction when the converter output power deviates from the reference. At the same time, according to the droop characteristics of the VOC, the changing trends of the voltage and frequency are directly adjusted based on the adaptive rotation angle, thereby controlling the converter output power, ensuring accurate tracking of the voltage and frequency at the grid connection point and the output power of the grid-connected converter, and taking into account both system stability and grid-connected output efficiency.

[0007] In a first aspect, the present invention provides a power optimization control method for a grid-connected converter based on improved VOC.

[0008] A power optimization control method for a grid-connected converter based on improved VOC, comprising:

[0009] Real-time acquisition of output voltage, current and angular frequency of three-phase grid-connected converter;

[0010] Based on the output voltage and output current, the current deviation value is calculated. After current scaling, the current deviation value is multiplied by the adaptive rotation angle matrix to obtain the current source and voltage source. According to the output voltage and output angular frequency, the rotation angle is adaptively and dynamically adjusted to change the changing trend of voltage and angular frequency, thereby decoupling active power and reactive power.

[0011] The current source and voltage source are input into the virtual oscillation controller, and the inductor current and capacitor voltage are output, which are then scaled to obtain the voltage adjustment value.

[0012] PWM modulation is performed according to the voltage adjustment value to obtain the converter switch control signal, thereby achieving stable control of the converter output power.

[0013] A further technical solution is to dynamically adjust the adaptive rotation angle as follows:

[0014] The output voltage amplitude and the voltage amplitude reference value, the output angular frequency and the angular frequency reference value are input into corresponding comparators respectively, and a comparison result is output; wherein four different comparison results are generated according to the difference between the two sets of input values;

[0015] Based on the output comparison result and the mapping relationship between the comparison result and the rotation angle value, the sine and cosine components of the rotation angle are calculated to complete the dynamic adjustment of the rotation angle.

[0016] In a second aspect, the present invention provides a power optimization control system for a grid-connected converter based on an improved VOC.

[0017] A power optimization control system for a grid-connected converter based on an improved VOC, comprising:

[0018] A data acquisition module is used to obtain the output voltage, current and angular frequency of the three-phase grid-connected converter in real time;

[0019] The voltage and current regulation module is used to calculate the current deviation value based on the output voltage and output current. The current deviation value is current-scaled and then multiplied by the adaptive rotation angle matrix to obtain the current source and voltage source. The rotation angle is adaptively and dynamically adjusted according to the output voltage and output angular frequency to change the changing trend of the voltage and angular frequency, thereby decoupling the active power and reactive power.

[0020] A virtual oscillation adjustment module is used to input a current source and a voltage source into a virtual oscillation controller, output an inductor current and a capacitor voltage, and obtain a voltage adjustment value after voltage scaling;

[0021] The power optimization control module is used to perform PWM modulation according to the voltage adjustment value to obtain the converter switch control signal and achieve stable control of the converter output power.

[0022] In a third aspect, the present invention further provides an electronic device comprising: a memory for storing executable instructions; and a processor for implementing the above-mentioned improved VOC-based grid-connected converter power optimization control method when executing the executable instructions stored in the memory.

[0023] In a fourth aspect, the present invention further provides a computer-readable storage medium storing executable instructions for causing a processor to execute the executable instructions to implement the above-mentioned improved VOC-based grid-connected converter power optimization control method.

[0024] In a fifth aspect, the present invention also provides a computer program product, which includes executable instructions, and the executable instructions are stored in a computer-readable storage medium; wherein, when the processor of the electronic device reads the executable instructions from the computer-readable storage medium and executes the executable instructions, the above-mentioned grid-connected converter power optimization control method based on improved VOC is implemented.

[0025] One or more of the above technical solutions have the following beneficial effects:

[0026] 1. The present invention provides a power optimization control method and system for a grid-connected converter based on an improved VOC, establishes a converter control architecture based on a virtual oscillator, and designs a power optimization control method based on an adaptive rotation angle on the basis of this architecture. The method can achieve fast and smooth correction when the converter output power deviates from the reference. At the same time, according to the droop characteristics of the VOC, the voltage and frequency change trends are directly adjusted based on the adaptive rotation angle, thereby controlling the converter output power, ensuring accurate tracking of the grid connection point voltage and frequency, and the grid-connected converter output power, and taking into account both system stability and grid-connected output efficiency.

[0027] 2. In the present invention, based on the droop characteristics of VOC and utilizing the coordinated mapping relationship between output power, voltage and frequency, the sine and cosine components of the rotation angle are set. By dynamically adjusting the rotation angle to change the changing trends of voltage and frequency, active and reactive power decoupling is achieved, thereby effectively improving the stability and economy of the grid-connected converter under conditions of grid strength fluctuations. The entire solution is simple, effective and conducive to engineering implementation.

[0028] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 This is an overall flow chart of the power optimization control method for a grid-connected converter based on improved VOC according to an embodiment of the present invention;

[0031] Figure 2 1 is an architecture diagram of power optimization control of a grid-connected converter based on improved VOC in an embodiment of the present invention;

[0032] Figure 3 2 is a diagram illustrating an architecture for adaptive adjustment of rotation angle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are exemplary only and are intended to describe specific embodiments and provide further explanation of the present invention, and are not intended to limit the exemplary embodiments according to the present invention. Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be made clear that the existing virtual oscillator control strategy of the grid-connected converter is: based on a given power reference value and , combined with the instantaneous current calculation, the output current reference value is obtained and , the reference value is subtracted from the instantaneous current measurement value, and then scaled and added to the rotation angle matrix Multiply them together to get a set of input signals for the virtual oscillator and After being processed by the virtual oscillator, the output inductor current is scaled and PWM-modulated to obtain the switching control signal of the grid-connected converter, thereby achieving control of the converter. However, considering the above-mentioned existing grid-connected converter control strategy based on the virtual oscillator controller (VOC), it adopts a constant rotation angle to couple active power and reactive power, that is, it cannot control active power and reactive power simultaneously. This may cause a significant deviation between the actual output power of the converter and the reference command, leading to chain hazards such as frequency and voltage instability, reduced power generation revenue, and limited new energy consumption. To address this problem, the present invention proposes a grid-connected converter power optimization control method based on an improved virtual oscillator controller (VOC). By utilizing the coordinated mapping relationship between output power, voltage, and frequency, the rotation angle is dynamically adjusted to change the variation trend of voltage and frequency, achieving active and reactive power decoupling, and then controlling the converter output power. This ensures accurate tracking of the voltage and frequency at the grid connection point and the output power of the grid-connected converter, taking into account both system stability and grid-connected output efficiency, and can effectively improve the stability of the converter and the grid-connected power quality of the new energy grid-connected power generation system.

[0035] Example 1

[0036] This embodiment provides a power optimization control method for a grid-connected converter based on an improved VOC. Figure 1 As shown, the specific steps include:

[0037] Step S1, obtaining the output voltage, current and angular frequency of the three-phase grid-connected converter in real time;

[0038] Step S2: Calculate a current deviation value based on the output voltage and the output current, and multiply the current deviation value by the adaptive rotation angle matrix after current scaling to obtain a current source and a voltage source; wherein, according to the output voltage and the output angular frequency, the rotation angle is adaptively and dynamically adjusted to change the changing trend of the voltage and angular frequency, thereby decoupling the active power and the reactive power;

[0039] Step S3: input the current source and the voltage source into the virtual oscillation controller, output the inductor current and the capacitor voltage, and then obtain the voltage adjustment value after voltage scaling;

[0040] Step S4: Perform PWM modulation according to the voltage adjustment value to obtain a converter switch control signal, thereby achieving stable control of the converter output power.

[0041] The following content introduces the power optimization control method of the grid-connected converter based on the improved VOC proposed in this embodiment in more detail.

[0042] The core point of the method proposed in this embodiment is: based on the VOC control architecture, a power optimization control method based on adaptive rotation angle is designed to ensure accurate tracking of the grid connection point voltage / frequency and grid-connected converter output power. Specifically, the grid-connected converter virtual oscillator control structure proposed in this embodiment is as follows: Figure 2 As shown, the physical part (i.e., the converter grid-connected physical system) includes a DC source , three-phase bridge PWM inverter, filter inductor and filter capacitors LC filter and grid-side inductor and AC power grid, the main body of the control part is the AHO oscillator, and its virtual circuit model includes:

[0043] (1) Inductor and capacitors The resonant LC circuit consists of a natural resonant frequency Equal to the grid angular frequency, ,inductance The current on the inductor is the inductor current ,capacitance The capacitor voltage on ;

[0044] (2) Nonlinearly related preset voltage source and preset current source , , ,in, , , 、 are steady-state convergence speed and oscillation amplitude, respectively;

[0045] (3) Input current source and input voltage source .

[0046] In addition, in the above virtual circuit model, the inductor After being connected in series with the preset voltage source and output voltage source, the preset current source and capacitor in parallel with the input current source.

[0047] On the basis of the above, first, the output voltage, output current and output angular frequency of the three-phase grid-connected converter are acquired in real time, and the instantaneous value of the output voltage, the instantaneous value of the output current and the instantaneous value of the output angular frequency can be acquired.

[0048] Second, define and They are Axis and The instantaneous value of the output voltage of the shaft, and are the output active power and output reactive power respectively, and Given active power reference value and reactive power reference value respectively, according to the instantaneous value of output voltage and active power reference value and reactive power reference value, calculate Axis and Output current reference value of the axis and .Depend on 、 calculate 、 The formula is:

[0049] ;

[0050] in, .

[0051] After that, the output current reference value 、 and Axis and Instantaneous current measurement of the shaft 、 Difference, we get Axis and Axis current deviation 、 .

[0052] Then, the current deviation value is current scaled, and the scaled result is multiplied by the adaptive rotation angle matrix to obtain the current source and voltage source, which are used as the input current source and input voltage source mentioned above. Specifically, define 、 are the voltage and current scaling factors, respectively, is the adaptive rotation angle, is the rotation angle matrix and , current deviation value 、 go through Scaling and multiplying with the rotation angle matrix gives 、 , and its calculation formula is:

[0053] .

[0054] Furthermore, this embodiment provides a power optimization control method based on adaptive rotation angle, and the rotation angle adaptive adjustment framework is as follows: Figure 3 As shown, specifically, first set the output voltage amplitude and voltage amplitude reference value , output angular frequency and angular frequency reference value They are input into the corresponding comparators respectively and the comparison results are output. , , the differential of the output voltage amplitude is .in addition, is the natural resonant frequency, which is actually the angular frequency reference value .

[0055] Among them, four different comparison results are generated according to the difference between the two sets of input values ,for:

[0056] .

[0057] Then, based on the output comparison result, according to the mapping relationship between the comparison result and the rotation angle value, the sine and cosine components of the rotation angle are calculated to complete the dynamic adjustment of the rotation angle. - Four different comparison results generated in the Calculation module The mapping relationship formed with a set of rotation angle values ​​is:

[0058] a) ,make ;

[0059] b) ,make ;

[0060] c) ,make ;

[0061] d) ,make ;

[0062] Then, the sine and cosine components of the rotation angle are ;

[0063] in, , , , , is the capacitance value.

[0064] When the output active power / output reactive power deviates from the power set value, and The sine and cosine components of the above adaptive rotation angle can be controlled to achieve 、 The dynamic trend of 、 Expressions can also be implemented 、 The algorithm proposed in this embodiment uses the droop characteristics of VOC and the coordinated mapping relationship between output power, voltage, and frequency to dynamically adjust the rotation angle to change the changing trends of voltage and frequency, achieving active and reactive power decoupling. This can effectively improve the stability and economy of the grid-connected converter under conditions of grid strength fluctuations. The entire solution is simple, effective, and conducive to engineering implementation.

[0065] Finally, the current deviation value 、 Current scaling factor After scaling, the current source and voltage source are multiplied by the adaptive rotation angle matrix, which are used as input current source and input voltage source to input into the virtual oscillation controller to output the inductor current. and capacitor voltage , and then through the voltage coefficient After voltage scaling, the voltage adjustment value is obtained 、 ; Perform PWM modulation according to the voltage adjustment value to obtain the converter switch control signal , to achieve stable control of the converter output power.

[0066] The control method for grid-connected converters proposed in this embodiment establishes a converter control architecture based on a virtual oscillator control (VOC). Based on this architecture, a power optimization control method based on an adaptive rotation angle is designed to achieve accurate tracking of the voltage / frequency at the grid connection point and the output power of the grid-connected converter, which can effectively improve the converter stability and grid-connected power quality in renewable energy grid-connected power generation systems.

[0067] Example 2

[0068] This embodiment provides a grid-connected converter power optimization control system based on improved VOC, which specifically includes:

[0069] Data acquisition module, used to obtain the output voltage, current and angular frequency of the three-phase grid-connected converter in real time;

[0070] The voltage and current regulation module is used to calculate the current deviation value based on the output voltage and output current. The current deviation value is current-scaled and then multiplied by the adaptive rotation angle matrix to obtain the current source and voltage source. The rotation angle is adaptively and dynamically adjusted according to the output voltage and output angular frequency to change the changing trend of the voltage and angular frequency, thereby decoupling the active power and reactive power.

[0071] A virtual oscillation adjustment module is used to input a current source and a voltage source into a virtual oscillation controller, output an inductor current and a capacitor voltage, and obtain a voltage adjustment value after voltage scaling;

[0072] The power optimization control module is used to perform PWM modulation according to the voltage adjustment value to obtain the converter switch control signal and achieve stable control of the converter output power.

[0073] Example 3

[0074] This embodiment provides an electronic device, including: a memory for storing executable instructions; and a processor for implementing the above method provided in this embodiment when executing the executable instructions stored in the memory.

[0075] Example 4

[0076] This embodiment further provides a computer-readable storage medium storing executable instructions. When the executable instructions are executed by a processor, the processor will be caused to execute the above method provided in this embodiment.

[0077] Example 5

[0078] This embodiment provides a computer program product including executable instructions, which are computer instructions stored in a computer-readable storage medium. When a processor of an electronic device reads the executable instructions from the computer-readable storage medium and executes the executable instructions, the electronic device performs the method provided in this embodiment.

[0079] The steps involved in the above embodiments 2 to 5 correspond to those in embodiment 1. For detailed implementation, please refer to the relevant description of embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media that includes one or more instruction sets; it should also be understood to include any medium that can store, encode, or carry an instruction set for execution by a processor and cause the processor to perform any method of the present invention.

[0080] Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using a general-purpose computer device. Alternatively, they can be implemented using program code executable by a computing device, which can then be stored in a storage device and executed by the computing device. Alternatively, they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0081] The above description is only a preferred embodiment of the present invention. Although the specific implementation of the present invention is described in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A power optimization control method for grid-connected converter based on improved VOC, characterized in that: include: Real-time acquisition of output voltage, current and angular frequency of three-phase grid-connected converter; Based on the output voltage and output current, the current deviation value is calculated. After current scaling, the current deviation value is multiplied by the adaptive rotation angle matrix to obtain the current source and voltage source. According to the output voltage and output angular frequency, the rotation angle is adaptively and dynamically adjusted to change the changing trend of voltage and angular frequency, thereby decoupling active power and reactive power. The current source and voltage source are input into the virtual oscillation controller, and the inductor current and capacitor voltage are output, which are then scaled to obtain the voltage adjustment value. PWM modulation is performed according to the voltage adjustment value to obtain the converter switch control signal to achieve stable control of the converter output power; The dynamic adjustment of the adaptive rotation angle is: The output voltage amplitude and the voltage amplitude reference value, the output angular frequency and the angular frequency reference value are input into corresponding comparators respectively, and a comparison result is output; wherein four different comparison results are generated according to the difference between the two sets of input values; Based on the output comparison result, according to the mapping relationship between the comparison result and the rotation angle value, the sine and cosine components of the rotation angle are calculated to complete the dynamic adjustment of the rotation angle; Among them, the four different comparison results generated are: ； in, Indicates the output voltage amplitude, Indicates the voltage reference value, represents the output angular frequency, Indicates the angular frequency reference value, Indicates different comparison results; The mapping relationship between the four different comparison results and a set of rotation angle values ​​is: when season ; when season ; when season ; when season ; Then the sine and cosine components of the rotation angle are ; in, , , , , , Indicates the output voltage amplitude, and They are Axis and The instantaneous value of the output voltage of the shaft, Indicates the voltage amplitude reference value, 、 are the voltage and current scaling factors, respectively, is the steady-state convergence rate; represents the output angular frequency, is the natural resonant frequency, that is, the angular frequency reference value ; and are the output active power and output reactive power respectively, and are given active power reference value and given reactive power reference value respectively, is the capacitance value.

2. The power optimization control method for grid-connected converter based on improved VOC according to claim 1, characterized in that: According to the output voltage and output current, the current deviation value is calculated, including: Calculating an output current reference value based on an output voltage instantaneous value and an active power reference value and a reactive power reference value; The current deviation value is obtained by subtracting the output current reference value from the output current instantaneous value.

3. The power optimization control method for grid-connected converter based on improved VOC according to claim 1, characterized in that: The virtual circuit model of the virtual oscillation controller is: The virtual circuit model includes an inductor and capacitors A resonant LC circuit, a nonlinearly related preset voltage source and a preset current source, an input current source and an input voltage source; Among them, the current source and voltage source obtained by multiplying the adaptive rotation angle matrix are used as the input current source and input voltage source, and the inductor After being connected in series with the preset voltage source and output voltage source, the preset current source and capacitor in parallel with the input current source.

4. A power optimization control system for grid-connected converter based on improved VOC, characterized in that: include: A data acquisition module is used to obtain the output voltage, current and angular frequency of the three-phase grid-connected converter in real time; The voltage and current regulation module is used to calculate the current deviation value based on the output voltage and output current. The current deviation value is current-scaled and then multiplied by the adaptive rotation angle matrix to obtain the current source and voltage source. The rotation angle is adaptively and dynamically adjusted according to the output voltage and output angular frequency to change the changing trend of the voltage and angular frequency, thereby decoupling the active power and reactive power. A virtual oscillation adjustment module is used to input the current source and voltage source into the virtual oscillation controller, output the inductor current and capacitor voltage, and then obtain the voltage adjustment value after voltage scaling; The power optimization control module is used to perform PWM modulation according to the voltage adjustment value to obtain the converter switch control signal and achieve stable control of the converter output power; The dynamic adjustment of the adaptive rotation angle is: The output voltage amplitude and the voltage amplitude reference value, the output angular frequency and the angular frequency reference value are input into corresponding comparators respectively, and a comparison result is output; wherein four different comparison results are generated according to the difference between the two sets of input values; Based on the output comparison result, according to the mapping relationship between the comparison result and the rotation angle value, the sine and cosine components of the rotation angle are calculated to complete the dynamic adjustment of the rotation angle; Among them, the four different comparison results generated are: ； in, Indicates the output voltage amplitude, Indicates the voltage reference value, represents the output angular frequency, Indicates the angular frequency reference value, Indicates different comparison results; The mapping relationship between the four different comparison results and a set of rotation angle values ​​is: when season ; when season ; when season ; when season ; Then the sine and cosine components of the rotation angle are ; in, , , , , , Indicates the output voltage amplitude, and They are Axis and The instantaneous value of the output voltage of the shaft, Indicates the voltage amplitude reference value, 、 are the voltage and current scaling factors, respectively, is the steady-state convergence rate; represents the output angular frequency, is the natural resonant frequency, that is, the angular frequency reference value ; and are the output active power and output reactive power respectively, and are given active power reference value and given reactive power reference value respectively, is the capacitance value; The current deviation value is calculated based on the output voltage and the output current, including: Calculating an output current reference value based on an output voltage instantaneous value and an active power reference value and a reactive power reference value; The output current reference value is subtracted from the output current instantaneous value to obtain the current deviation value; Wherein, the virtual circuit model of the virtual oscillation controller is: The virtual circuit model includes an inductor and capacitors A resonant LC circuit, a nonlinearly related preset voltage source and a preset current source, an input current source and an input voltage source; Among them, the current source and voltage source obtained by multiplying the adaptive rotation angle matrix are used as the input current source and input voltage source, and the inductor After being connected in series with the preset voltage source and output voltage source, the preset current source and capacitor in parallel with the input current source.

5. An electronic device, characterized in that: include: a memory for storing executable instructions; The processor is configured to implement the power optimization control method for a grid-connected converter based on an improved VOC as described in any one of claims 1 to 3 when executing the executable instructions stored in the memory.

6. A computer-readable storage medium, characterized in that Executable instructions are stored, which are used to cause the processor to execute the executable instructions to implement the power optimization control method of the grid-connected converter based on the improved VOC according to any one of claims 1 to 3.

7. A computer program product, characterized in that The computer program product includes executable instructions stored in a computer-readable storage medium; When the processor of the electronic device reads the executable instructions from the computer-readable storage medium and executes the executable instructions, the power optimization control method for the grid-connected converter based on the improved VOC according to any one of claims 1 to 3 is implemented.

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