Control method, system, device and medium of wind-solar-storage three-phase inverter

Abstract

The application belongs to the field of new energy power generation control, and discloses a control method, system, device and medium of a wind-solar-storage three-phase inverter; the method comprises the following steps: acquiring line parameters and operation data of the three-phase inverter; inputting the line parameters and operation data of the three-phase inverter into a pre-established DQ axis decoupling control model to obtain an input quantity of a control signal of the three-phase inverter; and controlling the three-phase inverter according to the obtained input quantity of the control signal of the three-phase inverter. According to the application, the input quantity of the control signal can be directly solved by analytical decoupling calculation according to a target quantity to be tracked, so that the tracking speed and accuracy of the control system are greatly improved. The control method of the application can analytically calculate the control variable, is suitable for the use rules of parallel hardware development such as FPGA, and greatly improves the development efficiency.

Description

Technical Field

[0001] This invention belongs to the field of new energy power generation control, and specifically relates to a control method, system, equipment and medium for a three-phase inverter of wind, solar and energy storage. Background Technology

[0002] With the continuous increase in fossil fuel consumption and the deterioration of the Earth's ecological environment, countries around the world are actively seeking a sustainable and environmentally friendly new energy source. Utilizing solar and wind power for power generation, storage, and supply, as a highly efficient and pollution-free new energy source, has become an important component of today's energy structure. Three-phase inverters are high-power inverters for electricity and are crucial components of wind, solar, and energy storage systems. Solar and wind power are highly susceptible to fluctuations due to natural environmental factors; however, current technologies for three-phase inverters cannot keep up with these fluctuations in a timely manner, resulting in relatively low control accuracy and efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a control method, system, device and medium for a three-phase inverter based on wind, solar and energy storage, so as to improve the control accuracy and efficiency of the three-phase inverter based on wind, solar and energy storage.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a control method for a three-phase inverter based on wind, solar, and energy storage, comprising:

[0006] Obtain the line parameters and operating data of the three-phase inverter;

[0007] The line parameters and operating data of the three-phase inverter are input into a pre-established DQ-axis decoupled control model, and the input quantity I of the control signal of the three-phase inverter is obtained by solving the model. d I q ;

[0008] Based on the input quantity I of the control signal obtained from the three-phase inverter d I q Control the three-phase inverter.

[0009] A further improvement of the present invention is that the line parameters of the three-phase inverter include line inductance L and resistance R.

[0010] A further improvement of the present invention is that the operating data of the three-phase inverter includes: the three-phase inverter voltage values ​​U. a U b U c The three-phase grid-side voltage value E a E b E c The three-phase line current value Ia I b I c .

[0011] A further improvement of this invention lies in: inputting the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solving for the input quantity I of the control signal of the three-phase inverter. d I q The steps specifically include:

[0012] Based on the obtained line parameters and operating data of the three-phase inverter, we get:

[0013]

[0014] U a U b U c These are the inverter voltage values ​​for phases a, b, and c, respectively, E. a E b E c These are the grid-side voltage values ​​for phases a, b, and c, respectively; L and R are the line inductance and resistance, respectively; I... a I b I c These are the line current values ​​for phases a, b, and c, respectively.

[0015] According to instantaneous power theory:

[0016]

[0017] P is the total instantaneous active power of the three phases, Q is the total instantaneous reactive power of the three phases, and U is the total instantaneous reactive power of the three phases. a * U b * U c * These are the inverter voltage values ​​U for phases a, b, and c, respectively. a U b U c The conjugate value;

[0018] Perform the ABC to DQ transformation; the transformation matrix is:

[0019]

[0020] Based on the transformation matrix, the expressions for voltage and current on the DQ axis are derived:

[0021]

[0022]

[0023] The instantaneous power expressions for active power P and reactive power Q in the DQ coordinate system are:

[0024]

[0025] Among them, E d E q The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; I d I q The d-axis and q-axis currents after DQ decomposition transformation of the line current;

[0026] And rotate the η-oriented Q-axis to such that E q I q =0, simplifying formula (6) to:

[0027]

[0028] Based on the ABC to DQ transformation, the voltage value is converted into parametric equations for the D-axis and Q-axis: where the subscripts d and q represent the electrical quantities of the D-axis and Q-axis, respectively;

[0029]

[0030] Further derivation yields:

[0031]

[0032] in:

[0033]

[0034] The established DQ axis decoupled control model is as follows:

[0035]

[0036] in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. It is the hyperbolic coefficient, P ref The target value of active power, Q ref This is the target value for reactive power;

[0037] Substituting into equation (8), we derive:

[0038]

[0039] Polynomial decomposition of equation (11) is performed, where δ d δ q It is the truncation error:

[0040]

[0041] Solving the system of equations (12), we get:

[0042]

[0043]

[0044] Secondly, the present invention provides a control system for a three-phase inverter based on wind, solar, and energy storage, comprising:

[0045] The data acquisition module is used to acquire the line parameters and operating data of the three-phase inverter.

[0046] The solver module is used to input the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solve for the input quantity I of the control signal of the three-phase inverter. d I q ;

[0047] The control module is used to input the control signal I from the obtained three-phase inverter. d I q Control the three-phase inverter.

[0048] A further improvement of the present invention is that the line parameters of the three-phase inverter include line inductance L and resistance R.

[0049] A further improvement of the present invention is that the operating data of the three-phase inverter includes: the three-phase inverter voltage values ​​U. a U b U c The three-phase grid-side voltage value E a E b E c The three-phase line current value I a I b I c .

[0050] A further improvement of this invention is that the solution module inputs the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solves to obtain the input quantity I of the control signal of the three-phase inverter. d I q The steps specifically include:

[0051] Based on the obtained line parameters and operating data of the three-phase inverter, we get:

[0052]

[0053] U a U b U cThese are the inverter voltage values ​​for phases a, b, and c, respectively, E. a E b E c These are the grid-side voltage values ​​for phases a, b, and c, respectively; L and R are the line inductance and resistance, respectively; I... a I b I c These are the line current values ​​for phases a, b, and c, respectively.

[0054] According to instantaneous power theory:

[0055]

[0056] P is the total instantaneous active power of the three phases, Q is the total instantaneous reactive power of the three phases, and U is the total instantaneous reactive power of the three phases. a * U b * U c * These are the inverter voltage values ​​U for phases a, b, and c, respectively. a U b U c The conjugate value;

[0057] Perform the ABC to DQ transformation; the transformation matrix is:

[0058]

[0059] Based on the transformation matrix, the expressions for voltage and current on the DQ axis are derived:

[0060]

[0061]

[0062] The instantaneous power expressions for active power P and reactive power Q in the DQ coordinate system are:

[0063]

[0064] Among them, E d E q The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; I d I q The d-axis and q-axis currents after DQ decomposition transformation of the line current;

[0065] And rotate the η-oriented Q-axis to such that E q I q =0, simplifying formula (6) to:

[0066]

[0067] Based on the ABC to DQ transformation, the voltage value is converted into parametric equations for the D-axis and Q-axis: where the subscripts d and q represent the electrical quantities of the D-axis and Q-axis, respectively;

[0068]

[0069] Further derivation yields:

[0070]

[0071] in:

[0072]

[0073] The established DQ axis decoupled control model is as follows:

[0074]

[0075] in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. It is the hyperbolic coefficient, P ref The target value of active power, Q ref This is the target value for reactive power;

[0076] Substituting into equation (8), we derive:

[0077]

[0078] Polynomial decomposition of equation (11) is performed, where δ d δ q It is the truncation error:

[0079]

[0080] Solving the system of equations (12), we get:

[0081]

[0082]

[0083] Thirdly, the present invention provides an electronic device, including a processor and a memory, wherein the processor is used to execute a computer program stored in the memory to implement the control method of the wind-solar-storage three-phase inverter.

[0084] Fourthly, the present invention provides a computer-readable storage medium storing at least one instruction, which, when executed by a processor, implements the control method for the wind-solar-storage three-phase inverter.

[0085] Compared to existing technologies, the present invention aims to provide a control method, system, device, and medium for a three-phase inverter based on wind, solar, and energy storage. The method includes: acquiring the line parameters and operating data of the three-phase inverter; inputting the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model; and solving for the input quantity I of the control signal of the three-phase inverter. d I q Based on the input quantity I of the control signal obtained from the three-phase inverter d I q This invention controls a three-phase inverter. It can directly and analytically calculate the input control signal based on the tracked target quantity, significantly improving the tracking speed and accuracy of the control system. The invented control method can analytically calculate control variables, making it suitable for use in parallel hardware development such as FPGAs, greatly improving development efficiency. Attached Figure Description

[0086] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0087] Figure 1 This is a schematic diagram of a three-phase inverter model;

[0088] Figure 2 A schematic diagram illustrating the relationship between the tracking curve and the target curve using the method of this invention;

[0089] Figure 3 This is a schematic diagram of a control method for a three-phase inverter based on wind, solar, and energy storage according to the present invention.

[0090] Figure 4 This is a schematic diagram of the control system of a three-phase inverter for wind, solar and energy storage according to the present invention;

[0091] Figure 5 This is a structural block diagram of an electronic device according to the present invention. Detailed Implementation

[0092] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0093] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0094] Example 1

[0095] The control method for a three-phase wind-solar-storage inverter designed in this invention can adaptively adjust control parameters in real time to track the system based on the nonlinear dynamic changes of the external power system, thereby optimizing the dynamic response of the device. The feedback control system established during the control system modeling process has robust characteristics of adaptability and error tolerance, which can reduce the impact of uncertainties, including model errors. This invention significantly improves the tracking speed and accuracy of the control system. The invented control method can analytically calculate control variables, is applicable to the usage rules of parallel hardware development such as FPGAs, and greatly improves development efficiency.

[0096] This invention discloses a control method for a three-phase wind-solar-storage inverter, applicable to FPGA parallel development and decoupled analytical control of three-phase wind-solar-storage inverters, specifically including the following steps:

[0097] Please see Figure 1 The figure shows a model of a three-phase inverter; in the model of a three-phase inverter, according to Kirchhoff's theorem, we have:

[0098]

[0099] U a U b U c These are the inverter voltage values ​​for phases a, b, and c, respectively, E. a E b E c These are the grid-side voltage values ​​for phases a, b, and c, respectively; L and R are the line inductance and resistance, respectively; I... a I b I c These are the line current values ​​for phases a, b, and c, respectively.

[0100] According to instantaneous power theory:

[0101]

[0102] P is the total instantaneous active power of the three phases, Q is the total instantaneous reactive power of the three phases, and U is the total instantaneous reactive power of the three phases. a * U b * U c * These are the inverter voltage values ​​U for phases a, b, and c, respectively. a U b U c The conjugate value.

[0103] We need to perform an ABC to DQ transformation. Let the transformation matrix be:

[0104]

[0105] Based on the transformation matrix above, the expressions for voltage and current on the DQ axis can be derived:

[0106]

[0107]

[0108] The instantaneous power expressions for active power P and reactive power Q in the DQ coordinate system are:

[0109]

[0110] Among them, E d E q The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; I d I q The d-axis and q-axis currents after DQ decomposition transformation of the line current;

[0111] And rotate the η-oriented Q-axis to such that E q I q =0, the above formula can be simplified to:

[0112]

[0113] This allows for decoupled control of active and reactive power.

[0114] According to the ABC to DQ transformation, the voltage value in the above equation can be transformed into parametric equations for the D-axis and Q-axis: where the subscripts d and q represent the electrical quantities of the D-axis and Q-axis, respectively;

[0115]

[0116] Further derivation yields:

[0117]

[0118] in:

[0119]

[0120] The DQ axis decoupled control model is established as follows:

[0121]

[0122] in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. It is the hyperbolic coefficient, P ref The target value of active power, Qref This is the target value for reactive power;

[0123] Substituting into the above equation, we can derive:

[0124]

[0125] Perform polynomial factorization on the above expression, where δ d δ q It is the truncation error:

[0126]

[0127] Solving the above system of cubic equations yields:

[0128]

[0129]

[0130] According to the control formulas of the present invention (13) and (14), the target quantity P being tracked can be determined based on the control formulas of the present invention (13) and (14). ref Q ref The input quantity I of the control signal can be directly solved by analytical decoupling calculation. d I q This significantly improves the tracking speed and accuracy of the control system. The invented control method can analytically calculate control variables, is applicable to the usage rules of parallel hardware development such as FPGAs, and greatly improves development efficiency. Please refer to... Figure 2 As shown, by applying the method of this invention, the tracking value can quickly track changes in the target value, greatly improving the tracking speed and accuracy of the control system.

[0131] The photovoltaic power control system designed in this invention is composed of equations (1-14) and can adaptively adjust the control parameters in real time to track the system based on the nonlinear dynamic changes of the external power system, thereby optimizing the dynamic response of the object. The feedback control system established during the modeling process has robust characteristics of adaptability and error tolerance, which can reduce the impact of uncertainties, including model errors.

[0132] Example 2

[0133] Please see Figure 3 As shown, the present invention provides a control method for a three-phase inverter based on wind, solar, and energy storage, comprising:

[0134] S1. Obtain the line parameters and operating data of the three-phase inverter;

[0135] S2. Input the line parameters and operating data of the three-phase inverter into the pre-established DQ-axis decoupled control model, and solve to obtain the input quantity I of the control signal of the three-phase inverter. d Iq ;

[0136] S3. Based on the input quantity I of the control signal obtained from the three-phase inverter. d I q Control the three-phase inverter.

[0137] In one specific implementation: the line parameters of the three-phase inverter include line inductance L and resistance R.

[0138] In one specific implementation: the operating data of the three-phase inverter includes: the three-phase inverter voltage value U a U b U c The three-phase grid-side voltage value E a E b E c The three-phase line current value I a I b I c .

[0139] In one specific implementation: the line parameters and operating data of the three-phase inverter are input into a pre-established DQ-axis decoupled control model, and the input quantity I of the control signal of the three-phase inverter is obtained by solving the model. d I q The steps specifically include:

[0140] Based on the obtained line parameters and operating data of the three-phase inverter, we get:

[0141]

[0142] U a U b U c These are the inverter voltage values ​​for phases a, b, and c, respectively, E. a E b E c These are the grid-side voltage values ​​for phases a, b, and c, respectively; L and R are the line inductance and resistance, respectively; I... a I b I c These are the line current values ​​for phases a, b, and c, respectively.

[0143] According to instantaneous power theory:

[0144]

[0145] P is the total instantaneous active power of the three phases, Q is the total instantaneous reactive power of the three phases, and U is the total instantaneous reactive power of the three phases. a * U b * Uc * These are the inverter voltage values ​​U for phases a, b, and c, respectively. a U b U c The conjugate value;

[0146] Perform the ABC to DQ transformation; the transformation matrix is:

[0147]

[0148] Based on the transformation matrix, the expressions for voltage and current on the DQ axis are derived:

[0149]

[0150]

[0151] The instantaneous power expressions for active power P and reactive power Q in the DQ coordinate system are:

[0152]

[0153] Among them, E d E q The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; I d I q The d-axis and q-axis currents after DQ decomposition transformation of the line current;

[0154] And rotate the η-oriented Q-axis to such that E q I q =0, simplifying formula (6) to:

[0155]

[0156] Based on the ABC to DQ transformation, the voltage value is converted into parametric equations for the D-axis and Q-axis: where the subscripts d and q represent the electrical quantities of the D-axis and Q-axis, respectively;

[0157]

[0158] Further derivation yields:

[0159]

[0160] in:

[0161]

[0162] The established DQ axis decoupled control model is as follows:

[0163]

[0164] in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. It is the hyperbolic coefficient, P ref The target value of active power, Q ref This is the target value for reactive power;

[0165] Substituting into equation (8), we derive:

[0166]

[0167] Polynomial decomposition of equation (11) is performed, where δ d δ q It is the truncation error:

[0168]

[0169] Solving the system of equations (12), we get:

[0170]

[0171]

[0172] Example 3

[0173] Please see Figure 4 As shown, the present invention provides a control system for a wind-solar-storage three-phase inverter, comprising:

[0174] The data acquisition module is used to acquire the line parameters and operating data of the three-phase inverter.

[0175] The solver module is used to input the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solve for the input quantity I of the control signal of the three-phase inverter. d I q ;

[0176] The control module is used to input the control signal I from the obtained three-phase inverter. d I q Control the three-phase inverter.

[0177] In one specific implementation: the line parameters of the three-phase inverter include line inductance L and resistance R.

[0178] In one specific implementation: the operating data of the three-phase inverter includes: the three-phase inverter voltage value U a U b U c The three-phase grid-side voltage value E a E bE c The three-phase line current value I a I b I c .

[0179] In one specific implementation: the solution module inputs the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solves to obtain the input quantity I of the control signal of the three-phase inverter. d I q The steps specifically include:

[0180] Based on the obtained line parameters and operating data of the three-phase inverter, we get:

[0181]

[0182] U a U b U c These are the inverter voltage values ​​for phases a, b, and c, respectively, E. a E b E c These are the grid-side voltage values ​​for phases a, b, and c, respectively; L and R are the line inductance and resistance, respectively; I... a I b I c These are the line current values ​​for phases a, b, and c, respectively.

[0183] According to instantaneous power theory:

[0184]

[0185] P is the total instantaneous active power of the three phases, Q is the total instantaneous reactive power of the three phases, and U is the total instantaneous reactive power of the three phases. a * U b * U c * These are the inverter voltage values ​​U for phases a, b, and c, respectively. a U b U c The conjugate value;

[0186] Perform the ABC to DQ transformation; the transformation matrix is:

[0187]

[0188] Based on the transformation matrix, the expressions for voltage and current on the DQ axis are derived:

[0189]

[0190]

[0191] The instantaneous power expressions for active power P and reactive power Q in the DQ coordinate system are:

[0192]

[0193] Among them, E d E q The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; I d I q The d-axis and q-axis currents after DQ decomposition transformation of the line current;

[0194] And rotate the η-oriented Q-axis to such that E q I q =0, simplifying formula (6) to:

[0195]

[0196] Based on the ABC to DQ transformation, the voltage value is converted into parametric equations for the D-axis and Q-axis: where the subscripts d and q represent the electrical quantities of the D-axis and Q-axis, respectively;

[0197]

[0198] Further derivation yields:

[0199]

[0200] in:

[0201]

[0202] The established DQ axis decoupled control model is as follows:

[0203]

[0204] in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. It is the hyperbolic coefficient, P ref The target value of active power, Q ref This is the target value for reactive power;

[0205] Substituting into equation (8), we derive:

[0206]

[0207] Polynomial decomposition of equation (11) is performed, where δ d δ q It is the truncation error:

[0208]

[0209] Solving the system of equations (12), we get:

[0210]

[0211]

[0212] Example 4

[0213] Please see Figure 4 As shown, the present invention also provides an electronic device 100 for implementing a control method for a three-phase inverter of wind, solar and energy storage; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0214] The memory 101 can be used to store the computer program 103. The processor 102 implements the control method of the wind-solar-storage three-phase inverter described in Embodiment 1 or 2 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0215] The at least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor. The processor 102 is the control center of the electronic device 100, connecting various parts of the electronic device 100 via various interfaces and lines.

[0216] The memory 101 in the electronic device 100 stores multiple instructions to implement a control method for a three-phase wind-solar-storage inverter, and the processor 102 can execute the multiple instructions to achieve the following:

[0217] Obtain the line parameters and operating data of the three-phase inverter;

[0218] The line parameters and operating data of the three-phase inverter are input into a pre-established DQ-axis decoupled control model, and the input quantity I of the control signal of the three-phase inverter is obtained by solving the model. d I q ;

[0219] Based on the input quantity I of the control signal obtained from the three-phase inverter d I q Control the three-phase inverter.

[0220] Example 5

[0221] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0222] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0223] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0224] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0225] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0226] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control method for a three-phase inverter based on wind, solar, and energy storage, characterized in that, include: Obtain the line parameters and operating data of the three-phase inverter; The line parameters and operating data of the three-phase inverter are input into a pre-established DQ-axis decoupled control model to solve for the input control signal of the three-phase inverter. , ; Based on the input quantity of the control signal obtained from the three-phase inverter , Controlling a three-phase inverter; The line parameters and operating data of the three-phase inverter are input into a pre-established DQ-axis decoupled control model, and the input quantity of the control signal of the three-phase inverter is obtained by solving the model. , The steps specifically include: Based on the obtained line parameters and operating data of the three-phase inverter, we get: （1） in , , These are the inverter voltage values ​​for phases a, b, and c, respectively. , , These are the grid-side voltage values ​​for phases a, b, and c, respectively. and These are the line inductance and resistance, , , These are the line current values ​​for phases a, b, and c, respectively. According to instantaneous power theory: （2） It is the total instantaneous active power of the three phases. It is the total instantaneous reactive power of the three phases. , , These are the inverter voltage values ​​for phases a, b, and c, respectively. , , The conjugate value; Perform the ABC to DQ transformation; the transformation matrix is: （3） Based on the transformation matrix, the expressions for voltage and current on the DQ axis are derived: （4） （5） Active power P and reactive power Q The instantaneous power in the DQ coordinate system is expressed as follows: （6） in, , The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; , The d-axis and q-axis currents after DQ decomposition transformation of the line current; and put Rotate the oriented Q-axis to make Equation (5) can be simplified to: （7） Based on the ABC to DQ transformation, the voltage value is converted into parametric equations for the D-axis and Q-axis: where the subscripts... and These represent the electrical quantities of the D-axis and Q-axis, respectively. （8） Further derivation yields: ，（9） in: （10） The established DQ axis decoupled control model is as follows: （11） in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. , , , It is the hyperbolic coefficient. It is the target value for active power. This is the target value for reactive power; Substituting into equation (8), we derive: （12） Polynomial factorization of equation (11) is performed, where , It is the truncation error: （13） Solving the system of equations (12), we get: （14） （15）。 2. The control method for a three-phase wind-solar-storage inverter according to claim 1, characterized in that, The line parameters of the three-phase inverter include line inductance. L and resistance R .

3. The control method for a three-phase wind-solar-storage inverter according to claim 1, characterized in that, The operating data of the three-phase inverter includes: the inverter voltage values ​​of the three phases. , , Three-phase grid-side voltage values , , Three-phase line current values , , .

4. The control system of a three-phase inverter based on wind, solar, and energy storage, characterized in that, include: The data acquisition module is used to acquire the line parameters and operating data of the three-phase inverter. The solver module is used to input the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solve for the input quantities of the control signals of the three-phase inverter. , ; The control module is used to input control signals from the three-phase inverter. , Controlling a three-phase inverter; The solution module inputs the line parameters and operating data of the three-phase inverter into a pre-established DQ-axis decoupled control model, and solves to obtain the input quantities of the control signals of the three-phase inverter. , The steps specifically include: Based on the obtained line parameters and operating data of the three-phase inverter, we get: （1） in , , These are the inverter voltage values ​​for phases a, b, and c, respectively. , , These are the grid-side voltage values ​​for phases a, b, and c, respectively. and These are the line inductance and resistance, , , These are the line current values ​​for phases a, b, and c, respectively. According to instantaneous power theory: （2） It is the total instantaneous active power of the three phases. It is the total instantaneous reactive power of the three phases. , , These are the inverter voltage values ​​for phases a, b, and c, respectively. , , The conjugate value; Perform the ABC to DQ transformation; the transformation matrix is: （3） Based on the transformation matrix, the expressions for voltage and current on the DQ axis are derived: （4） （5） The instantaneous power expressions for active power P and reactive power Q in the DQ coordinate system are: （6） in, , The d-axis and q-axis voltages after DQ decomposition transformation of the grid-side voltage; , The d-axis and q-axis currents after DQ decomposition transformation of the line current; and put Rotate the oriented Q-axis to make Equation (6) can be simplified to: （7） Based on the ABC to DQ transformation, the voltage value is converted into parametric equations for the D-axis and Q-axis: where the subscripts... and These represent the electrical quantities of the D-axis and Q-axis, respectively. （8） Further derivation yields: ，（9） in: （10） The established DQ axis decoupled control model is as follows: （11） in This indicates the ideal control signal for the D-axis. This indicates the ideal control signal for the Q-axis. , , , It is the hyperbolic coefficient. It is the target value for active power. This is the target value for reactive power; Substituting into equation (8), we derive: （12） Polynomial factorization of equation (11) is performed, where , It is the truncation error: （13） Solving the system of equations (12), we get: （14） （15）。 5. The control system of the wind-solar-storage three-phase inverter according to claim 4, characterized in that, The line parameters of the three-phase inverter include line inductance. L and resistance R .

6. The control system of the wind-solar-storage three-phase inverter according to claim 4, characterized in that, The operating data of the three-phase inverter includes: the inverter voltage values ​​of the three phases. , , Three-phase grid-side voltage values , , Three-phase line current values , , .

7. An electronic device, characterized in that, It includes a processor and a memory, the processor being used to execute a computer program stored in the memory to implement the control method for a wind-solar-storage three-phase inverter as described in any one of claims 1 to 3.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction, which, when executed by a processor, implements the control method for a three-phase wind-solar-storage inverter as described in any one of claims 1 to 3.

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