Anti-interference control method for optical storage integrated converter

Abstract

The invention relates to the technical field of light-storage integrated converter control, in particular to an anti-interference control method for a light-storage integrated converter. The method comprises the following steps that firstly, according to the operation principle of the optical storage integrated converter, a mathematical model of the optical storage integrated converter under external interference is established, and the mathematical model comprises a Boost converter mathematical model and an inverter mathematical model; then, according to the mathematical model, expansion state observers are established, disturbance variable estimation values are obtained, the expansion state observers comprise a Boost converter expansion state observer and an inverter expansion state observer, and the disturbance variable estimation values comprise a Boost converter disturbance variable estimation value and an inverter disturbance variable estimation value; thirdly, error functions are established according to the mathematical model, and the error functions comprise a Boost converter error function and an inverter error function; and finally, establishing a Boost converter controller and an inverter controller according to the error function and the disturbance variable estimation value.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic-storage integrated converter control, and in particular to an anti-interference control method for a photovoltaic-storage integrated converter. Background Art

[0002] The photovoltaic-storage integrated converter is a key component of modern new energy systems. It can achieve seamless switching and integrated management between photovoltaic power generation, energy storage and power grid, and has efficient and intelligent energy conversion and scheduling functions. The system usually includes three core circuit modules: Boost converter, bidirectional DC-DC converter and inverter, which are used to increase the voltage of photovoltaic power generation, control the bidirectional energy flow between energy storage equipment and load, and convert DC power into AC power for power supply or grid connection.

[0003] The main function of the boost converter is to increase the low voltage output by the photovoltaic cell to a high voltage that meets the needs of the load or energy storage system. The control of the boost converter must be able to adjust its switching duty cycle in real time to ensure the stability of the output voltage. At the same time, the system needs to consider various interference factors such as grid fluctuations and power changes to avoid the impact of voltage fluctuations on the overall system. The bidirectional DC-DC converter is used for bidirectional energy flow between the energy storage device and the DC bus. When photovoltaic power generation is in excess, the electric energy is stored in the battery through the bidirectional DC-DC converter; when photovoltaic power generation is insufficient, the electric energy in the battery is released to the load or grid through the converter. In order to ensure the stable operation of the system, the control of the bidirectional DC-DC converter is required to have precise charge and discharge management, energy balance control and power regulation functions, and be able to respond quickly and maintain high accuracy during the current and voltage conversion process. The inverter is responsible for converting DC power into AC power to ensure that the power quality meets the grid connection or power supply standards. Since the work of the inverter involves harmonics and phase control of AC power, its stability and efficiency are crucial to the energy conversion of the entire system.

[0004] However, the photovoltaic-storage integrated converter system is affected by various uncertain factors during operation, such as photovoltaic power generation fluctuations, battery aging, and load mutations, which may lead to unstable power regulation or deterioration of power quality. To address these problems, an anti-interference control method for photovoltaic-storage integrated converter is proposed. Summary of the invention

[0005] The present invention provides an anti-interference control method for an integrated photovoltaic and storage converter, which is used to solve the above technical problems. First, according to the operating principle of the integrated photovoltaic and storage converter, a mathematical model of the integrated photovoltaic and storage converter under external interference is established, and the mathematical model includes a Boost converter mathematical model and an inverter mathematical model; then, according to the mathematical model, an extended state observer is established to obtain an interference quantity estimation value, and the extended state observer includes a Boost converter extended state observer and an inverter extended state observer, and the interference quantity estimation value includes a Boost converter interference quantity estimation value and an inverter interference quantity estimation value; then, according to the mathematical model, an error function is established, and the error function includes a Boost converter error function and an inverter error function; finally, according to the error function and the interference quantity estimation value, a Boost converter controller and an inverter controller are established.

[0006] A method for controlling an anti-interference of a photovoltaic-storage integrated converter comprises the following steps:

[0007] S1. According to the operation principle of the photovoltaic-storage integrated converter, a mathematical model of the photovoltaic-storage integrated converter under external interference is established, wherein the mathematical model includes a Boost converter mathematical model and an inverter mathematical model;

[0008] S2. According to the mathematical model, an extended state observer is established to obtain an interference amount estimation value, wherein the extended state observer includes a Boost converter extended state observer and an inverter extended state observer, and the interference amount estimation value includes a Boost converter interference amount estimation value and an inverter interference amount estimation value;

[0009] S3. Establishing an error function according to the mathematical model, wherein the error function includes a Boost converter error function and an inverter error function;

[0010] S4. Establish a Boost converter controller and an inverter controller according to the error function and the interference estimation value.

[0011] Furthermore, the photovoltaic-storage integrated converter includes a Boost converter, a bidirectional DC-DC converter and an inverter, wherein the bidirectional DC-DC converter is controlled by a PI controller.

[0012] Furthermore, a mathematical model of the photovoltaic-storage integrated converter is established, and the mathematical model includes a Boost converter mathematical model and an inverter mathematical model; the Boost converter mathematical model is:

[0013]

[0014] Among them, i L is the inductor current, u pvis the photovoltaic cell output voltage, L pv is the inductance value of the Boost converter, C in is the Boost converter capacitance value, r pv is the dynamic resistance of the photovoltaic array, u dc is the DC bus voltage, D1 is the duty cycle, d1 and d2 are the Boost converter interference quantities;

[0015] The inverter mathematical model is:

[0016]

[0017] Where, L is the AC side filter inductor, R2 is the AC side equivalent resistance, ω is the angular frequency of the grid voltage, i d and k d are the current and switching function of the converter AC side on the d-axis respectively; i q and k q are the current and switching function on the q axis of the AC side of the converter respectively; u d and u q are the components of the grid voltage on the d-axis and q-axis respectively, and d3 and d4 are the inverter interference quantities.

[0018] Further, according to the mathematical model, an extended state observer is established to obtain an interference amount estimation value, wherein the extended state observer includes a Boost converter extended state observer and an inverter extended state observer, and the interference amount estimation value includes a Boost converter interference amount estimation value and an inverter interference amount estimation value; the Boost converter extended state observer is:

[0019]

[0020] Among them, z 11 、z 12 、z 13 and z 14 is the state variable of the Boost converter extended state observer, and z 12 and z 14 is the estimated value of the Boost converter interference, They are z 11 、z 12 、z 13 、z 14 The first derivative of K 11 , K 12 , K 13 and K 14 are parameters of the Boost converter extended state observer;

[0021] The inverter extended state observer is:

[0022]

[0023] Among them, z 21 、z 22 、z 23 and z 24 is the state variable of the inverter extended state observer, and z 22 and z 24 is the estimated value of the inverter interference, They are z 21 、z 22 、z 23 、z 24 The first derivative of K 21 , K 22 , K 23 and K 24 are the parameters of the inverter extended state observer.

[0024] Furthermore, an error function is established according to the mathematical model, wherein the error function includes a Boost converter error function and an inverter error function; the Boost converter error function is:

[0025]

[0026] Among them, e 11 and e 12 is the Boost converter error function, is the expected photovoltaic cell output voltage, is the desired inductor current;

[0027] The inverter error function is:

[0028]

[0029] Among them, e 31 and e 41 is the inverter error function, is the expected current on the d-axis of the AC side of the converter, is the expected current on the q-axis of the AC side of the converter, and the specific formula is:

[0030]

[0031] Among them, P ref is the expected inverter active power, Q ref is the expected inverter reactive power.

[0032] Further, according to the Boost converter error function and the estimated value of the Boost converter interference, a Boost converter controller is established according to the super-helical sliding mode control principle:

[0033]

[0034] Among them, λ1, λ2, λ3 and λ4 are the parameters of the Boost converter controller. for The first derivative of for The first derivative of .

[0035] Furthermore, it is characterized in that, according to the inverter error function and the estimated value of the inverter interference, an inverter controller is established according to the super-helical sliding mode control principle:

[0036]

[0037] Among them, λ5, λ6, λ7 and λ8 are the inverter controller parameters, They are The first derivative of .

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. By establishing extended state observers for the Boost converter and the inverter, the external disturbances of each part are monitored and compensated in real time. The method provided by the present invention can obtain and compensate for the external disturbances of the system in real time, significantly enhance the anti-interference performance of the photovoltaic storage integrated converter, and ensure that the system maintains high stability and robustness in complex environments.

[0040] 2. Combining the error functions and interference estimates of each subsystem, corresponding controllers are established for the Boost converter and inverter respectively, ensuring the accurate error tracking effect of the system under multivariable conditions, further realizing high-precision control of important output quantities such as voltage and current, and making the coordinated control between modules more accurate.

[0041] 3. In order to solve the nonlinear and uncertainty problems of the system, the super-helical sliding mode control method is adopted to reduce the jitter phenomenon of traditional sliding mode control by constructing a non-singular continuous sliding mode surface, and further improve the dynamic performance and steady-state accuracy of the integrated photovoltaic and energy storage converter, thereby enhancing the robustness and adaptability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the process of the present invention;

[0043] Figure 2 It is a photovoltaic and energy storage integrated converter circuit;

[0044] Figure 3 This is the control block diagram of the photovoltaic and energy storage integrated converter;

[0045] Figure 4 is the photovoltaic voltage u pv Change curve;

[0046] Figure 5 It is the active power P variation curve. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In modern energy management, the control accuracy and reliability of the photovoltaic and energy storage integrated converter are crucial to the performance of the entire system. Although traditional control technology performs well in many application scenarios, it is often difficult to adapt to changing system requirements under complex energy environments and dynamic conditions. To this end, the present invention provides an anti-interference control method for a photovoltaic and energy storage integrated converter. The method combines the real-time control mechanism of the Boost converter and the inverter, adopts super-helical sliding mode control technology, optimizes power scheduling, and realizes efficient and stable energy conversion and supply. Through this control strategy, the photovoltaic and energy storage integrated converter can maintain excellent control performance in a changing operating environment, ensuring the reliable operation of the system under different working conditions.

[0049] Embodiment 1

[0050] In the embodiment of the present application, a method for controlling the anti-interference of a photovoltaic-storage integrated converter is adopted; the specific implementation process is as follows Figure 1As shown, first, according to the operating principle of the photovoltaic and energy storage integrated converter, a mathematical model of the photovoltaic and energy storage integrated converter under external interference is established, and the mathematical model includes a Boost converter mathematical model and an inverter mathematical model; then, according to the mathematical model, an extended state observer is established to obtain an interference quantity estimation value, and the extended state observer includes a Boost converter extended state observer and an inverter extended state observer, and the interference quantity estimation value includes a Boost converter interference quantity estimation value and an inverter interference quantity estimation value; then, according to the mathematical model, an error function is established, and the error function includes a Boost converter error function, a bidirectional DC-DC converter error function and an inverter error function; finally, according to the error function and the interference quantity estimation value, a Boost converter controller, a bidirectional DC-DC converter controller and an inverter controller are established to ensure that the photovoltaic and energy storage integrated converter can achieve efficient and stable energy conversion and supply during operation.

[0051] The circuit diagram of the integrated photovoltaic and energy storage converter is as follows: Figure 2 As shown in the figure, it mainly includes Boost converter, bidirectional DC / DC converter and inverter. The core part of the system is the inverter, which is composed of multiple switch tubes. These switch tubes control the conversion of DC power into AC power through specific switching modes. The DC side of the inverter is connected to a DC bus capacitor C dc , used to smooth the DC voltage. On the left side of the inverter, there are two DC / DC converters, one for connecting the photovoltaic panel and the other for connecting the battery. The photovoltaic panel is connected to the battery through an inductor L pv and capacitor C in The boost circuit is connected to the inverter, which can increase the output voltage of the photovoltaic panel to the DC voltage level required by the inverter. The output of the photovoltaic panel is also protected by a diode VD to prevent reverse current flow. The battery energy storage part is connected to the inverter through an inductor L bat The inductor is connected to the inverter and the switch tube. This inductor is used to limit the sudden change of current and protect the circuit. The charge and discharge state of the battery is controlled by the DC / DC converter to maintain the health of the battery and extend its service life. The output of the inverter is connected to the load through a filter composed of inductor L and resistor R2. This filter is used to reduce the harmonics of the output current and improve the quality of the output power. The entire system uses a precise control strategy to ensure that the AC output of the inverter is synchronized with the power grid to achieve a stable power supply. During operation, the photovoltaic panel generates electricity under sunshine conditions, and the voltage is increased by the Boost converter to supply the inverter. At the same time, the battery can provide electricity when the energy generated by the photovoltaic panel is insufficient or at night, and is connected to the inverter through a DC / DC converter. The inverter converts DC power into AC power and supplies it to the load. The entire system achieves efficient energy conversion and stable output through control strategies.

[0052] The control block diagram of the photovoltaic storage integrated converter of the present invention is as follows: Figure 3 As shown, the output of the photovoltaic cell is boosted by a Boost converter, and the Boost converter is regulated by a Boost converter controller, which receives a reference value of the DC bus voltage. And adjust the Boost converter to maintain the required voltage level. The boosted voltage passes through a bidirectional DC / DC converter, which is shared by the battery and the photovoltaic system, allowing energy to flow between the photovoltaic panel, the battery, and the load. When the energy generated by the photovoltaic system exceeds the load demand, the excess energy can be stored in the battery; when the energy generated by the photovoltaic system is insufficient, the battery can release energy to meet the load demand. The charge and discharge status of the battery is controlled by the bidirectional DC / DC converter to ensure that the battery is not overcharged or over-discharged. The inverter converts DC power into AC power and supplies AC loads or connects to the grid. The control of the inverter is performed by the inverter controller, which uses SVPWM technology to optimize the switching operation of the inverter to produce high-quality AC power. The inverter controller receives the active power P ref and reactive power Q ref The reference value of the d-axis and q-axis reference currents are calculated. and To achieve precise control of the inverter output current.

[0053] In the embodiment of the present application, the performance of the Boost converter controller is verified through specific experiments. Furthermore, the specific implementation process of the embodiment of the present application is as follows: The parameters of the integrated photovoltaic and energy storage converter are selected as follows: C in =2.2mF, L pv =0.352mH, r pv =0.5Ω, L=1mH, R2=0.01Ω, ω=314.16rad / s, where, L pv is the inductance value of the Boost converter, C in is the Boost converter capacitance value, r pv is the dynamic resistance of the photovoltaic array, L is the AC side filter inductor, R2 is the AC side equivalent resistance, ω is the angular frequency of the grid voltage, and the parameters of the bidirectional DC-DC converter are selected as follows: L bat =5mH,u bat =400V; where L bat is the inductance of the bidirectional DC-DC converter, u bat is the battery output voltage, the battery rated capacity is 100Ah, and the battery initial charge state is 50%; set the expected value

[0054] Furthermore, the photovoltaic-storage integrated converter includes a Boost converter, a bidirectional DC-DC converter and an inverter, wherein the bidirectional DC-DC converter is controlled by a PI controller.

[0055] In the embodiment of the present application, the bidirectional DC-DC converter controller is controlled by a PI controller to achieve precise control of the battery charging and discharging process. The PID controller can adjust the output according to the real-time error of the system to achieve stable current and voltage control, ensuring the dynamic balance of the system under load changes or environmental fluctuations, thereby improving the reliability of the converter.

[0056] Furthermore, a mathematical model of the Boost converter is established; the mathematical model of the Boost converter is:

[0057]

[0058] Among them, i L is the inductor current, u pv is the photovoltaic cell output voltage, L pv is the inductance value of the Boost converter, C in is the Boost converter capacitance value, r pv is the dynamic resistance of the photovoltaic array, u dc is the DC bus voltage, D1 is the duty cycle, d1 and d2 are the Boost converter interference quantities;

[0059] In the embodiment of the present application, a mathematical model of the Boost converter is established. The mathematical model makes the analysis of the operating state of the converter more systematic and accurate, thereby providing a reliable basis for the design of subsequent control strategies. In addition, the mathematical model can effectively reveal the interaction between the various components, provide support for more efficient energy management and scheduling, and thus improve the overall performance and stability of the system.

[0060] Furthermore, according to the Boost converter mathematical model, an extended state observer of the Boost converter is established to obtain an estimated value of the interference amount of the Boost converter; the extended state observer of the Boost converter is:

[0061]

[0062] Among them, z 11 、z 12 、z 13 and z 14 is the state variable of the Boost converter extended state observer, and z 12 and z 14 is the estimated value of the Boost converter interference, They are z11 、z 12 、z 13 、z 14 The first derivative of K 11 , K 12 , K 13 and K 14 are parameters of the Boost converter extended state observer;

[0063] In the embodiment of the present application, an extended state observer is established for the Boost converter to monitor and compensate for external disturbances of each part in real time. The method provided by the present invention can obtain and compensate for external disturbances of the system in real time, significantly enhance the anti-interference performance of the photovoltaic storage integrated converter, and ensure that the system maintains high stability and robustness in complex environments.

[0064] Furthermore, a Boost converter error function is established according to the Boost converter mathematical model; the Boost converter error function is:

[0065]

[0066] Among them, e 11 and e 12 is the Boost converter error function, is the expected photovoltaic cell output voltage, is the desired inductor current;

[0067] In the embodiment of the present application, the error function of the Boost converter is established according to the Boost converter mathematical model, which significantly improves the control accuracy and performance monitoring capability of the system. These error functions provide real-time performance feedback for each component, allowing the system to quickly identify and correct deviations, further improving the stability and reliability of the system.

[0068] Further, according to the Boost converter error function and the estimated value of the Boost converter interference, a Boost converter controller is established according to the super-helical sliding mode control principle:

[0069]

[0070] Among them, λ1, λ2, λ3 and λ4 are the parameters of the Boost converter controller. for The first derivative of for The first derivative of .

[0071] In an embodiment of the present application, a Boost converter controller is designed in combination with super-spiral sliding mode control and an extended state observer. Through the super-spiral sliding mode control method, the present invention effectively reduces the jitter phenomenon and improves the control accuracy, so that the system can still output stably in a rapidly changing environment, thereby further enhancing the dynamic adaptability of the converter. In addition, the extended state observer estimates the external interference in the Boost converter in real time and inputs the estimated value into the controller, which significantly improves the anti-interference performance of the system. In a complex and unpredictable environment, the extended state observer can dynamically identify interference changes, so that the control system maintains steady-state performance in the presence of interference, and ensures the stability of the output voltage and current.

[0072] Specifically, through MATLAB / Simulink simulation, the control effect can be obtained as follows Figure 4 shown. Figure 4 The control performance comparison results of the Boost converter. The horizontal axis represents time t, and the vertical axis represents the photovoltaic voltage u pv In the figure, the blue line represents the tracking result under PID control; the green line represents the tracking result under the super-helical sliding mode control method; and the red line represents the tracking result under the control method proposed by the present invention. Figure 4 This shows that the control law designed in the present invention effectively suppresses interference and achieves stable control.

[0073] Embodiment 2

[0074] In the embodiment of the present application, the performance of the inverter controller is verified through specific experiments. Furthermore, the specific implementation process of the embodiment of the present application is as follows: The parameters of the photovoltaic integrated converter are selected as follows: C in =2.2mF, L pv =0.352mH, r pv =0.5Ω, L=1mH, R2=0.01Ω, ω=314.16rad / s, where, L pv is the inductance value of the Boost converter, C in is the Boost converter capacitance value, r pv is the dynamic resistance of the photovoltaic array, L is the AC side filter inductor, R2 is the AC side equivalent resistance, ω is the angular frequency of the grid voltage, and the parameters of the bidirectional DC-DC converter are selected as follows: L bat =5mH,u bat =400V; where L bat is the inductance of the bidirectional DC-DC converter, u bat is the battery output voltage, the battery rated capacity is 100Ah, and the battery initial charge state is 50%; set the expected value P ref =30kW, Q ref =0.

[0075] Furthermore, the inverter mathematical model is established, and the inverter mathematical model is:

[0076]

[0077] Where, L is the AC side filter inductor, R2 is the AC side equivalent resistance, ω is the angular frequency of the grid voltage, i d and k d are the current and switching function of the converter AC side on the d-axis respectively; i q and k q are the current and switching function on the q axis of the AC side of the converter respectively; u d and u q are the components of the grid voltage on the d-axis and q-axis respectively, and d3 and d4 are the inverter interference quantities.

[0078] Furthermore, according to the inverter mathematical model, an inverter extended state observer is established to obtain an estimated value of the interference amount; the inverter extended state observer is:

[0079]

[0080] Among them, z 21 、z 22 、z 23 and z 24 is the state variable of the inverter extended state observer, and z 22 and z 24 is the estimated value of the inverter interference, They are z 21 、z 22 、z 23 、z 24 The first derivative of K 21 , K 22 , K 23 and K 24 are the parameters of the inverter extended state observer.

[0081] Furthermore, an inverter error function is established according to the inverter mathematical model; the inverter error function is:

[0082]

[0083] Among them, e 31 and e 41 is the inverter error function, is the expected current on the d-axis of the AC side of the converter, is the expected current on the q-axis of the AC side of the converter, and the specific formula is:

[0084]

[0085] Among them, P ref is the expected inverter active power, Q ref is the expected inverter reactive power.

[0086] Further, according to the Boost converter error function and the estimated value of the Boost converter interference, a Boost converter controller is established according to the super-helical sliding mode control principle:

[0087]

[0088] Among them, λ1, λ2, λ3 and λ4 are the parameters of the Boost converter controller. for The first derivative of for The first derivative of .

[0089] In an embodiment of the present application, by introducing an inverter controller based on super-helical sliding mode control, the performance of the photovoltaic and energy storage integrated converter system in terms of AC side current control and power output is significantly improved. The controller combines efficient dynamic response capability with strong anti-interference performance to ensure the stable operation of the inverter under changing loads and external disturbances. In addition, the introduction of super-helical sliding mode control enables the inverter controller to flexibly respond to grid voltage fluctuations and load changes, and optimize the active and reactive power output of the inverter. This flexibility can improve the power quality in practical applications and reduce the impact of the grid on the photovoltaic and energy storage integrated converter, thereby achieving more efficient and reliable energy conversion and supply.

[0090] Specifically, through MATLAB / Simulink simulation, the control effect can be obtained as follows Figure 5 shown. Figure 5 The control performance comparison results of the Boost converter are shown in Figure 2. The horizontal axis represents time t, and the vertical axis represents the active power P change curve. In the figure, the blue line represents the tracking result under PI control; the green line represents the tracking result under the super-helical sliding mode control method; and the red line represents the tracking result under the control method proposed in the present invention. Figure 5 This shows that the control law designed in the present invention effectively suppresses interference and achieves stable control.

[0091] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for anti-interference control of a photovoltaic and energy storage integrated converter, characterized in that: The following steps are involved: S1. According to the operation principle of the photovoltaic-storage integrated converter, a mathematical model of the photovoltaic-storage integrated converter under external interference is established, wherein the mathematical model includes a Boost converter mathematical model and an inverter mathematical model; S2. According to the mathematical model, an extended state observer is established to obtain an interference amount estimation value, wherein the extended state observer includes a Boost converter extended state observer and an inverter extended state observer, and the interference amount estimation value includes a Boost converter interference amount estimation value and an inverter interference amount estimation value; S3. Establishing an error function according to the mathematical model, wherein the error function includes a Boost converter error function and an inverter error function; S4. Establish a Boost converter controller and an inverter controller according to the error function and the interference estimation value.

2. The anti-interference control method for a photovoltaic-storage integrated converter according to claim 1, characterized in that: The photovoltaic-storage integrated converter comprises a Boost converter, a bidirectional DC-DC converter and an inverter, wherein the bidirectional DC-DC converter is controlled by a PI controller.

3. The anti-interference control method for a photovoltaic-storage integrated converter according to claim 1, characterized in that: A mathematical model of the photovoltaic-storage integrated converter is established, wherein the mathematical model includes a Boost converter mathematical model and an inverter mathematical model; the Boost converter mathematical model is: Among them, i L is the inductor current, u pv is the photovoltaic cell output voltage, L pv is the inductance value of the Boost converter, C in is the Boost converter capacitance value, r pv is the dynamic resistance of the photovoltaic array, u dc is the DC bus voltage, D1 is the duty cycle, d1 and d2 are the Boost converter interference quantities; The inverter mathematical model is: Where, L is the AC side filter inductor, R2 is the AC side equivalent resistance, ω is the angular frequency of the grid voltage, i d and k d are the current and switching function of the converter AC side on the d-axis respectively; i q and k q are the current and switching function on the q axis of the AC side of the converter respectively; u d and u q are the components of the grid voltage on the d-axis and q-axis respectively, and d3 and d4 are the inverter interference quantities.

4. The anti-interference control method for a photovoltaic-storage integrated converter according to claim 3 is characterized in that: According to the mathematical model, an extended state observer is established to obtain an interference amount estimation value, wherein the extended state observer includes a Boost converter extended state observer and an inverter extended state observer, and the interference amount estimation value includes a Boost converter interference amount estimation value and an inverter interference amount estimation value; the Boost converter extended state observer is: Among them, z 11 、z 12 、z 13 and z 14 is the state variable of the Boost converter extended state observer, and z 12 and z 14 is the estimated value of the Boost converter interference, They are z 11 、z 12 、z 13 、z 14 The first derivative of K 11 , K 12 , K 13 and K 14 are parameters of the Boost converter extended state observer; The inverter extended state observer is: Among them, z 21 、z 22 、z 23 and z 24 is the state variable of the inverter extended state observer, and z 22 and z 24 is the estimated value of the inverter interference, They are z 21 、z 22 、z 23 、z 24 The first derivative of K 21 , K 22 , K 23 and K 24 are the parameters of the inverter extended state observer.

5. The anti-interference control method for a photovoltaic-storage integrated converter according to claim 1, characterized in that: An error function is established according to the mathematical model, wherein the error function includes a Boost converter error function and an inverter error function; the Boost converter error function is: Among them, e 11 and e 12 is the Boost converter error function, is the expected photovoltaic cell output voltage, is the desired inductor current; The inverter error function is: Among them, e 31 and e 41 is the inverter error function, is the expected current on the d-axis of the AC side of the converter, is the expected current on the q-axis of the AC side of the converter, and the specific formula is: Among them, P ref is the expected inverter active power, Q ref is the expected inverter reactive power.

6. The anti-interference control method for a photovoltaic-storage integrated converter according to claim 5, characterized in that: According to the Boost converter error function and the estimated value of the Boost converter interference, the Boost converter controller is established according to the super-helical sliding mode control principle: Among them, λ1, λ2, λ3 and λ4 are the parameters of the Boost converter controller. for The first derivative of for The first derivative of .

7. The anti-interference control method for a photovoltaic-storage integrated converter according to claim 5, characterized in that: According to the inverter error function and the estimated value of the inverter interference, the inverter controller is established according to the super-helical sliding mode control principle: Among them, λ5, λ6, λ7 and λ8 are the inverter controller parameters, They are The first derivative of .

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