Method and device for determining impedance parameter of wind driven generator, equipment and storage medium

Abstract

The invention discloses a method and device for determining impedance parameters of a wind driven generator, equipment and a storage medium. When the method provided by the embodiment of the invention is executed, a target input voltage is firstly determined, and the target input voltage is input into a target wind driven generator to obtain a target output current; and then determining the ratio of the target input voltage to the target output current as the ideal amplitude-frequency characteristic of the target wind driven generator, and determining the electrical transfer function of the target wind driven generator. And finally, on the basis of the ideal amplitude-frequency characteristic and the electrical transfer function, two target impedance parameters of target inductance and target resistance of the target wind driven generator are calculated in combination with an H-infinity control method. The design precision of the impedance parameters of the wind driven generator is improved, and universality and adaptability are enhanced due to the fact that the method is suitable for various wind power generation systems. Compared with a genetic algorithm, PSO and the like, the method has the advantages that the calculation cost and complexity are reduced, and the impedance parameter determination efficiency is optimized.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbines, and in particular to a method, device, equipment and storage medium for determining impedance parameters of a wind turbine. Background Art

[0002] With the widespread application of renewable energy, wind power generation is a key technology, and its stability and efficiency are crucial to ensure the reliable operation of the power grid. In the wind power generation system, the impedance parameters of the wind turbine (including inductance L and resistance R) are the core parameters that affect the performance of the motor. At present, there are many design methods for the impedance parameters of wind turbines, such as genetic algorithm, particle swarm optimization (PSO), quasi-annealing algorithm, adaptive control, linear quadratic regulator (LQR) and frequency domain method.

[0003] However, the above-mentioned wind turbine impedance parameter design methods face various challenges. Although evolutionary computing methods such as genetic algorithms, PSO and quasi-annealing algorithms can explore a large solution space, they are prone to fall into local optimality when searching for the optimal solution, are sensitive to impedance parameter initialization and weight setting, and have high computational costs. Adaptive control can automatically adjust the wind turbine impedance parameters according to the dynamic changes of the wind power generation system, but it has limitations for rapidly changing wind power generation systems. The wind turbine impedance parameters designed by LQR by minimizing the quadratic performance index are suitable for linear wind power generation systems, but require an accurate wind power generation system model and are sensitive to model errors. The frequency domain method focuses on meeting the requirements of specific frequency response when designing the wind turbine impedance parameters, but due to the influence of nonlinear and time-varying wind power generation systems, the scope of application of the frequency domain method is limited. Therefore, although there are currently a variety of methods for designing wind turbine impedance parameters, these methods still face challenges in terms of accuracy, efficiency and scope of application.

[0004] Therefore, how to provide an efficient, accurate and applicable method for designing wind turbine impedance parameters for various types of wind power generation systems is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] Based on the above problems, the present application provides a method, device, equipment and storage medium for determining the impedance parameters of a wind turbine, which can provide an efficient, accurate wind turbine impedance parameter design method suitable for various types of wind power generation systems.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] A method for determining impedance parameters of a wind turbine generator, the method comprising:

[0008] Determining a target input voltage, and inputting the target input voltage into a target wind turbine to obtain a target output current;

[0009] Determine the ratio of the target input voltage to the target output current as the ideal amplitude-frequency characteristic of the target wind turbine, and determine the electrical transfer function of the target wind turbine;

[0010] Based on the ideal amplitude-frequency characteristic and the electrical transfer function, in combination with the H∞ control method, the target impedance parameter of the target wind turbine is calculated;

[0011] The target impedance parameters include a target inductance and a target resistance of the target wind turbine.

[0012] In a possible implementation, the step of calculating the target impedance parameter of the target wind turbine generator based on the ideal amplitude-frequency characteristic and the electrical transfer function in combination with an H∞ control method includes:

[0013] Setting preliminary impedance parameters of the target wind turbine;

[0014] The target impedance parameter of the target wind turbine is determined by utilizing the H∞ control method in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition.

[0015] In a possible implementation, the H∞ control method is used to determine the target impedance parameter of the target wind turbine in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition, including:

[0016] Calculating an instantiated transfer function of the target wind turbine generator based on a plurality of preliminary impedance parameters within a target angular frequency range of the target wind turbine generator; the instantiated transfer function is the electrical transfer function into which the preliminary impedance parameters are substituted;

[0017] Calculating an intermediate impedance parameter of the target wind turbine based on the constraint condition, the instantiated transfer function and a preset upper limit value;

[0018] Based on the intermediate impedance parameter and the impedance parameter calculation formula, an intermediate amplitude-frequency characteristic is calculated; the intermediate amplitude-frequency characteristic is the electrical transfer function into which the intermediate impedance parameter is substituted; the impedance parameter calculation formula is L′=K(s)′, K(s)′=R1+S·L1, L′ is the intermediate amplitude-frequency characteristic, R1 is the intermediate resistance in the intermediate impedance parameter, and L1 is the intermediate inductance in the intermediate impedance parameter; S is a complex frequency variable in Laplace transform, S=j*ω, j is an imaginary unit, and ω is a target angular frequency;

[0019] Subtracting the intermediate amplitude-frequency characteristic from the ideal amplitude-frequency characteristic, and taking the modulus of the difference as the calculated difference;

[0020] Setting the intermediate amplitude-frequency characteristic as a new instantiated transfer function;

[0021] In combination with the H∞ control method, a new instantiated transfer function is used to replace the original instantiated transfer function, so as to repeat the above steps of calculating the intermediate impedance parameter, calculating the intermediate amplitude-frequency characteristic, calculating the difference, and substituting the intermediate impedance parameter, and record the calculated difference obtained by each calculation;

[0022] Draw a difference curve based on all the calculated differences; the intermediate differences have a one-to-one correspondence with the preliminary impedance parameters;

[0023] If the difference curve satisfies the convergence condition, the intermediate impedance parameter with the smallest corresponding calculated difference is used as the target impedance parameter; the convergence condition includes that the difference curve converges to the preset upper limit value.

[0024] In a possible implementation, the restriction condition includes: a first restriction condition and a second restriction condition;

[0025] The first restriction condition is:

[0026] The second restriction condition is: (X+1) * ·(1+X c )+(1+X c ) * ·(1+X c )>0;

[0027] Wherein, X is the electrical transfer function, X=K(s)=R+S·L, R is the preliminary resistance in the preliminary impedance parameters, L is the preliminary inductance in the preliminary impedance parameters; S is the complex frequency variable in the Laplace transform, S=j*ω, j is the imaginary unit, ω is the target angular frequency; L d is the ideal amplitude-frequency characteristic; γ is the preset upper limit value; I is the unit matrix; (XL d )* For (XL d )'s conjugate complex number; X c Pass a function to the instantiation.

[0028] In a possible implementation, the method further includes:

[0029] If the difference curve does not meet the convergence condition, the latest instantiated transfer function is used to replace the original instantiated transfer function, so as to repeat the above steps of calculating the intermediate impedance parameter, calculating the intermediate amplitude-frequency characteristic, calculating the difference and substituting the intermediate impedance parameter, so as to obtain a new calculated difference;

[0030] adjusting the difference curve based on the new calculated difference to obtain a new difference curve;

[0031] If the new difference curve still does not meet the convergence condition, the above steps of calculating a new difference and adjusting the difference curve are repeated based on the new difference curve until the latest difference curve meets the convergence condition.

[0032] A device for determining impedance parameters of a wind turbine generator, the device comprising:

[0033] A first determining unit, configured to determine a target input voltage;

[0034] An input unit, used for inputting the target input voltage into a target wind turbine to obtain a target output current;

[0035] a second determining unit, configured to determine a ratio of the target input voltage to the target output current as an ideal amplitude-frequency characteristic of the target wind turbine generator, and determine an electrical transfer function of the target wind turbine generator;

[0036] A first calculation unit, configured to calculate a target impedance parameter of the target wind turbine generator based on the ideal amplitude-frequency characteristic and the electrical transfer function in combination with an H∞ control method;

[0037] The target impedance parameters include a target inductance and a target resistance of the target wind turbine.

[0038] In a possible implementation manner, the first computing unit specifically includes:

[0039] A first setting unit, used to set the preliminary impedance parameters of the target wind turbine;

[0040] The second determination unit is used to determine the target impedance parameter of the target wind turbine by using the H∞ control method in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition.

[0041] In a possible implementation manner, the second determining unit specifically includes:

[0042] A second calculation unit is used to calculate an instantiated transfer function of the target wind turbine based on a plurality of preliminary impedance parameters within a target angular frequency range of the target wind turbine; the instantiated transfer function is the electrical transfer function into which the preliminary impedance parameters are substituted;

[0043] A third calculation unit, calculating an intermediate impedance parameter of the target wind turbine based on the constraint condition, the instantiated transfer function and a preset upper limit value;

[0044] a fourth calculation unit, configured to calculate an intermediate amplitude-frequency characteristic based on the intermediate impedance parameter and the impedance parameter calculation formula; the intermediate amplitude-frequency characteristic is the electrical transfer function into which the intermediate impedance parameter is substituted; the impedance parameter calculation formula is L′=K(s)′, K(s)′=R1+S·L1, L′ is the intermediate amplitude-frequency characteristic, R1 is the intermediate resistance in the intermediate impedance parameter, and L1 is the intermediate inductance in the intermediate impedance parameter; S is a complex frequency variable in Laplace transform, S=j*ω, j is an imaginary unit, and ω is a target angular frequency;

[0045] a fifth calculation unit, configured to make a difference between the intermediate amplitude-frequency characteristic and the ideal amplitude-frequency characteristic, and take a modulus value of the difference as a calculated difference;

[0046] The second setting unit is used to set the intermediate amplitude-frequency characteristic as a new instantiated transfer function.

[0047] A synthesis unit, used to combine the H∞ control method, use a new instantiated transfer function to replace the original instantiated transfer function, repeat the above steps of intermediate impedance parameter calculation, intermediate amplitude-frequency characteristic calculation, calculation difference calculation and intermediate impedance parameter substitution, and record the calculation difference obtained by each calculation;

[0048] A difference curve drawing unit, used for drawing a difference curve based on all the calculated differences; the intermediate differences have a one-to-one correspondence with the preliminary impedance parameters;

[0049] A screening unit is used to use the intermediate impedance parameter with the smallest corresponding calculated difference as the target impedance parameter if the difference curve satisfies the convergence condition; the convergence condition includes that the difference curve converges to the preset upper limit value.

[0050] A device for determining impedance parameters of a wind turbine generator comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for determining impedance parameters of the wind turbine generator as described above is implemented.

[0051] A computer-readable storage medium stores instructions, and when the instructions are executed on a terminal device, the terminal device executes the method for determining impedance parameters of a wind turbine generator as described above.

[0052] Compared with the prior art, this application has the following beneficial effects:

[0053] The present application provides a method, device, equipment and storage medium for determining the impedance parameters of a wind turbine. Specifically, when executing the method for determining the impedance parameters of a wind turbine provided in an embodiment of the present application, first, by determining the target input voltage and inputting it into the target wind turbine, the target output current can be obtained. Then, the ratio of the target input voltage to the target output current is defined as the ideal amplitude-frequency characteristic of the target wind turbine, and the electrical transfer function of the target wind turbine is determined. Based on these ideal characteristics and transfer functions, combined with the H∞ control method, the impedance parameters required by the target wind turbine can be calculated, including the target inductance and the target resistance.

[0054] The present application determines the ratio between the target input voltage and the output current, combines the calculation of the ideal amplitude-frequency characteristics and the electrical transfer function of the target wind turbine, and uses the H∞ control method to calculate the target impedance parameters, so as to more accurately design the performance of the wind turbine. At the same time, the combination of the analysis of the amplitude-frequency characteristics and the electrical transfer function, as well as the application of the H∞ control method, can be applied to different types of wind power generation systems, thereby improving the versatility and applicability of the method for determining the impedance parameters of the wind turbine. In addition, compared with methods such as genetic algorithms and PSO, the computational cost of the present application is relatively low, because it is directly based on the ideal amplitude-frequency characteristics and the electrical transfer function for calculation, avoiding complex search processes and parameter initialization, thereby improving the efficiency of determining the impedance parameters of the wind turbine.

[0055] In addition, the H∞ control method has strong robustness and can effectively handle uncertainties and disturbances in the system, making the designed impedance parameters more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] Figure 1 A method flow chart of a method for determining impedance parameters of a wind turbine generator provided in an embodiment of the present application;

[0058] Figure 2 A method flow chart of a method for calculating a target impedance parameter provided in an embodiment of the present application;

[0059] Figure 3 A method flow chart of a method for determining a target impedance parameter provided in an embodiment of the present application;

[0060] Figure 4 A method flow chart of a difference curve optimization method provided in an embodiment of the present application;

[0061] Figure 5 A schematic diagram of the structure of a device for determining impedance parameters of a wind turbine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] To facilitate understanding of the technical solutions provided by the embodiments of the present application, the background technology involved in the embodiments of the present application will be described below.

[0063] With the widespread use of renewable energy, wind power generation plays a key role in grid stability and efficiency. The impedance parameters of wind turbines (including inductance L and resistance R) are the core factors that determine their performance. There are currently many methods for designing these impedance parameters, such as genetic algorithms, PSO, quasi-annealing algorithms, adaptive control, LQR, and frequency domain methods.

[0064] However, these design methods face various challenges. Although evolutionary computation methods such as genetic algorithms, PSO and quasi-annealing algorithms can search a larger solution space, they are prone to fall into local optimal solutions, are sensitive to impedance parameter initialization and weight setting, and have high computational costs. Adaptive control can automatically adjust impedance parameters according to the dynamic changes of the wind power system, but has certain limitations when dealing with rapidly changing wind power systems. LQR designs parameters by minimizing quadratic performance indicators and is suitable for linear wind power systems, but requires an accurate wind power system model and is sensitive to errors. The frequency domain method focuses on the requirements of specific frequency responses, but is limited by nonlinear and time-varying wind power systems.

[0065] Therefore, although a variety of design methods have been proposed, they remain challenging in terms of accuracy, efficiency, and applicability.

[0066] In order to solve this problem, a method, device, equipment and storage medium for determining the impedance parameters of a wind turbine are provided in an embodiment of the present application. A specific target input voltage is first determined and applied to the target wind turbine to observe and record the target output current. The ratio of the target input voltage to the target output current is used as an indicator of the ideal amplitude-frequency characteristic, and the electrical transfer function is further determined, which is an important parameter describing the dynamic relationship between voltage and current. Combined with the H∞ control method, the target impedance parameters of the target wind turbine are finally calculated by analyzing the ideal amplitude-frequency characteristics and the electrical transfer function, including the target inductance and the target resistance. These parameters play a key role in rationally designing the performance of the wind power generation system and improving its stability and efficiency. The present application calculates the expected impedance parameters by comprehensively analyzing the ideal amplitude-frequency characteristics and electrical transfer function of the target wind turbine, and combining the H∞ control strategy to calculate the expected impedance parameters, which not only improves the accuracy of the performance design of the wind turbine, but also adapts to various types of wind power generation systems, significantly enhancing the adaptability and compatibility of the impedance parameter determination method. Compared with the use of complex optimization technologies such as genetic algorithms and particle swarm optimization, the present application directly calculates impedance parameters based on ideal amplitude-frequency characteristics and electrical transfer functions, avoiding the lengthy search process and initial parameter setting stage, thereby improving the efficiency of determining the impedance parameters of wind turbines while ensuring high efficiency.

[0067] 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 application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0068] See also Figure 1 , which is a flow chart of a method for determining impedance parameters of a wind turbine generator provided in an embodiment of the present application, such as Figure 1 As shown, the method for determining the impedance parameters of a wind turbine generator may include steps S101-S103:

[0069] S101: Determine a target input voltage, and input the target input voltage into a target wind turbine generator to obtain a target output current.

[0070] In the field of wind power generation, in order to optimize the performance of the target wind turbine and ensure its stable operation in a complex and changing power grid environment, this community adopts a systematic strategy to determine its target impedance parameters. This process begins with the target input voltage V ingThe target input voltage V ing Input into the wind turbine, the corresponding output current (recorded as target output current I ing ), thereby obtaining a set of data with a specific relationship.

[0071] It should be noted that the input voltage of a wind turbine depends on many factors, including the type of generator (DC or AC), design power, voltage level of the power grid, and other system requirements. Generally speaking, small household wind turbines may output 24 volts (V), 48V or higher DC power, while medium and large wind turbines usually directly output 690V (three-phase AC) or 1100 volts to 3300V, depending on the installation location (such as remote areas may be connected to a 240V power grid) and the grid connection standard (for example, the commonly used wiring standard in Europe is 390V, and the commonly used in North America is 480V).

[0072] It should also be noted that the target wind turbine is any wind turbine for which impedance parameters are to be determined.

[0073] S102: Determine the ratio of the target input voltage to the target output current as the ideal amplitude-frequency characteristic of the target wind turbine, and determine the electrical transfer function of the target wind turbine.

[0074] The target input voltage and target output current are compared and analyzed. This ratio represents the performance characteristics of the target wind turbine generator, that is, the ideal amplitude-frequency characteristic L d (i.e. ideal amplitude-frequency characteristic L d =V ing / I ing ). The ideal amplitude-frequency characteristic is a key indicator to describe the response characteristics of the control system at different frequencies. It reflects the sensitivity and response ability of the power system to frequency changes. Furthermore, it is necessary to construct the electrical transfer function K(S) of the wind power generation system where the target wind turbine is located. The electrical transfer function is a mathematical model that describes the dynamic relationship between input voltage and output current. It is a microcosm of the dynamic behavior of the system and provides a basic framework for subsequent system analysis and optimization.

[0075] In a possible implementation, K(S)=R+SL, where R is resistance, L is inductance, S is a complex frequency variable in Laplace transform, S=j*ω, j is an imaginary unit, and ω is a target angular frequency.

[0076] S103: Based on the ideal amplitude-frequency characteristic and the electrical transfer function, in combination with an H∞ control method, a target impedance parameter of the target wind turbine is calculated.

[0077] Based on the ideal amplitude-frequency characteristics and electrical transfer functions obtained above, combined with the advanced H∞ control method, i.e., infinite gauge theory, the stability, robustness and performance optimization of wind power generation systems under various operating conditions can be further studied. Finally, by integrating the results of the above steps, the target impedance parameters of the target wind turbine generator can be calculated, including the target inductance and target resistance. The target inductance reflects the hysteresis effect of the internal coil of the motor on the alternating current, while the target resistance characterizes the loss in the motor material and circuit structure. The accurate setting of these parameters is crucial to ensure the efficient and stable operation of the wind turbine generator. They not only affect the power factor, efficiency and response speed of the generator, but also directly affect the safety and economy of the operation of the entire wind power generation system.

[0078] See also Figure 2 , Figure 2 A method flow chart of a method for calculating a target impedance parameter provided in an embodiment of the present application. Accordingly, step S103 calculates the target impedance parameter of the target wind turbine based on the ideal amplitude-frequency characteristic and the electrical transfer function in combination with the H∞ control method, which can be specifically implemented through steps A1-A2:

[0079] A1: Set the preliminary impedance parameters of the target wind turbine.

[0080] In order to calculate the target impedance parameters of the wind turbine, it is first necessary to set the preliminary impedance parameters of the target wind turbine, that is, the electrical transfer function K(S)=R+SL of the wind turbine system where the target wind turbine is located, and set the initial values ​​of R and L.

[0081] It should be noted that the initial values ​​of R and L can be reasonably set based on experience.

[0082] A2: Assume that the target impedance parameters of the target wind turbine are determined by utilizing the H∞ control method in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameters, the impedance parameter calculation formula, the restriction conditions and the convergence conditions.

[0083] By utilizing the H∞ control method, combined with the ideal amplitude-frequency characteristics, electrical transfer function, preliminary impedance parameters, impedance parameter calculation formula, constraints and convergence conditions, the target impedance parameters of the target wind turbine can be determined. This means that when designing the target wind turbine, the required ideal amplitude-frequency characteristics, electrical transfer function and preliminary impedance parameters are comprehensively considered, and the H∞ control method is applied to optimize the parameter selection. At the same time, the set constraints and conditions to ensure convergence performance are followed to ensure that the target wind turbine meets the design requirements.

[0084] In a possible implementation, the restriction condition includes: a first restriction condition and a second restriction condition;

[0085] The first restriction condition is:

[0086] The second restriction condition is: (X+1) * ·(1+X c )+(1+X c ) * ·(1+X c )>0;

[0087] Wherein, X is the electrical transfer function, X=K(s)=R+S·L, R is the preliminary resistance in the preliminary impedance parameters, L is the preliminary inductance in the preliminary impedance parameters; S is the complex frequency variable in the Laplace transform, S=j*ω, j is the imaginary unit, ω is the target angular frequency; L d is the ideal amplitude-frequency characteristic; γ is the preset upper limit value; I is a unit matrix of size 2x2; (XL d ) * For (XL d )'s conjugate complex number; X c Pass a function to the instantiation.

[0088] See also Figure 3 , Figure 3 A method flow chart of a method for determining a target impedance parameter provided in an embodiment of the present application. Accordingly, step A2 uses the H∞ control method, combined with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition, to determine the target impedance parameter of the target wind turbine, which can be specifically achieved through steps B1-B8:

[0089] B1: calculating an instantiated transfer function of the target wind turbine based on a plurality of preliminary impedance parameters within a target angular frequency range of the target wind turbine.

[0090] In the target angular frequency range of the target wind turbine, the instantiation transfer function K of the target wind turbine is calculated based on the preliminary impedance parameters. c , which means that a specific transfer function (i.e., instantiated transfer function K) is determined according to the preset target angular frequency range and the initial impedance parameters of the target wind turbine. c ). The preliminary parameters include preliminary resistance and preliminary inductance.

[0091] Specifically, the instantiated transfer function is obtained by substituting the preliminary impedance parameters into the electrical transfer function of the current loop controller. At the same time, the target angular frequency ω needs to be substituted into the complex frequency variable S=j*ω in the electrical transfer function.

[0092] Example 1: Assuming that the initial resistance is 50 ohms (Ω), the initial inductance is 100 millihenry (mH), and the target angular frequency ω = 1, then the instantiated transfer function K c =50+0.1j.

[0093] It should be noted that the target angular frequency range of the target wind turbine refers to the frequency range that needs to be considered during the design or operation process, which usually depends on the dynamic characteristics, control requirements and operating conditions of the wind power generation system where the target wind turbine is located. For wind turbines, the selection of the target angular frequency range can affect the response speed, stability and control effectiveness of the wind power generation system where the target wind turbine is located. By determining the target angular frequency range, the behavior of the wind turbine at different frequencies can be better understood, and the control strategy can be optimized to ensure that the wind power generation system where the target wind turbine is located can operate stably and achieve the expected performance within the entire frequency range.

[0094] B2: Calculating the intermediate impedance parameter of the target wind turbine based on the constraint condition, the instantiated transfer function and a preset upper limit value.

[0095] In the calculation, the instantiation transfer function K c After that, we can instantiate the transfer function K c The preset upper limit value γ is substituted into the first constraint condition and the second constraint condition to calculate the intermediate impedance parameters of the target wind turbine generator. The intermediate impedance parameters include intermediate resistance and intermediate inductance.

[0096] It should be noted that the size of the preset upper limit value is generally set to a number close to 0.

[0097] Example 2: Taking Example 1 as an example, let’s assume that the upper bound γ is set to 0.001. Then, the instantiated transfer function K c =50+0.1j, γ=0.001Substitute into the first constraint condition and the second constraint (X+1) * ·(1+X c )+(1+X c ) * ·(1+X c )>0, thereby obtaining the intermediate impedance parameter of the target wind turbine.

[0098] B3: Calculate the intermediate amplitude-frequency characteristic based on the intermediate impedance parameter and the impedance parameter calculation formula.

[0099] Based on the intermediate impedance parameter and the impedance parameter calculation formula, calculating the intermediate amplitude-frequency characteristic means substituting the intermediate impedance parameter into the electrical transfer function, and determining the electrical transfer function into which the intermediate impedance parameter is substituted as the intermediate amplitude-frequency characteristic. According to the impedance parameter calculation formula, L′=K(s)′, K(s)′=R1+S·L1, L′ is the intermediate amplitude-frequency characteristic, R1 is the intermediate resistance in the intermediate impedance parameter, and L1 is the intermediate inductance in the intermediate impedance parameter; S is the complex frequency variable in the Laplace transform, S=j*ω, j is the imaginary unit, and ω is the target angular frequency.

[0100] Example 3, assuming that the intermediate resistance is 3Ω, the intermediate inductance is 100mH, and the target angular frequency is 1, then the intermediate amplitude-frequency characteristic L′=K(s)′=3+0.1j.

[0101] B4: Subtract the intermediate amplitude-frequency characteristic from the ideal amplitude-frequency characteristic, and take the modulus of the difference as the calculated difference.

[0102] The intermediate amplitude-frequency characteristic is compared with the ideal amplitude-frequency characteristic, but since the result of the subtraction between the two may be a quantity with an imaginary unit, it is necessary to take the modulus of the subtraction result to obtain the calculated difference, in order to evaluate the deviation between the intermediate amplitude-frequency characteristic and the target expectation. This process helps quantify the degree of difference between the closed-loop characteristics of different parameter settings and the target requirements, so as to determine the most suitable parameter configuration.

[0103] Example 4: Taking Example 3 as an example, let’s continue to explain. Assume that the ideal amplitude-frequency characteristic L d =2+0.2j, the intermediate amplitude-frequency characteristic L′=K(s)′=3+0.1j, then the modulus of the difference between the intermediate amplitude-frequency characteristic and the ideal amplitude-frequency characteristic is 1.01 1 / 2 .

[0104] B5: Set the intermediate amplitude-frequency characteristic as a new instantiated transfer function.

[0105] In addition, the intermediate amplitude-frequency characteristic calculated in step B3 needs to be set as a new instantiated transfer function to calculate other intermediate impedance parameters of the target wind turbine based on the constraint conditions, the new instantiated transfer function and the preset upper limit value.

[0106] B6: In combination with the H∞ control method, a new instantiated transfer function is used to replace the original instantiated transfer function to repeat the above steps B2-B5, and the calculated difference obtained in each calculation is recorded.

[0107] By combining the H∞ control method, using a new instantiated transfer function to replace the original instantiated transfer function, the steps of intermediate impedance parameter calculation in step B2, intermediate amplitude-frequency characteristic calculation in step B3, difference calculation in step B4, and new instance parameter setting in step B5 can be performed. At the same time, in each repetition process, a calculated difference will be obtained, which reflects the impact of using different instantiated transfer functions on system performance and control effect.

[0108] B7: Draw a difference curve based on all the calculated differences.

[0109] There is a one-to-one correspondence between these calculated differences and each intermediate impedance parameter, which means that each set of intermediate impedance parameters will produce a corresponding calculated difference. At the same time, this series of calculated differences is plotted on a curve to form a difference curve. This curve provides an intuitive way to understand the degree of performance improvement or deviation from the target under different intermediate impedance parameter combinations by observing the changing trend of the difference size. This method helps to identify which intermediate impedance parameter combination is closest to or reaches the predetermined target performance standard, thereby guiding the selection or optimization direction of the final parameters. Overall, this difference curve-based method is an effective strategy for systematically evaluating and selecting the optimal impedance parameters.

[0110] It should be noted that the preliminary parameter having a one-to-one correspondence with the calculated difference refers to the intermediate impedance parameter substituted into the intermediate amplitude-frequency characteristic used when calculating the calculated difference.

[0111] B8: If the difference curve meets the convergence condition, the intermediate impedance parameter with the smallest corresponding calculated difference is used as the target impedance parameter.

[0112] When the difference curve shows a certain stability or stops changing significantly, it reaches a preset upper limit value (that is, the difference curve meets the convergence condition). Convergence means that the optimization strategy may have approached or reached the optimal solution.

[0113] On this basis, "the convergence condition includes the difference curve converging to a preset upper limit value", which means that this condition will only be met when the difference curve does reach a preset upper limit value. This upper limit represents the limit of the performance improvement that can be brought about by the intermediate impedance parameter. In this case, from the current set of intermediate impedance parameters, the intermediate impedance parameter corresponding to the minimum calculated difference (i.e., the closest to the target performance) is selected as the target impedance parameter in the subsequent analysis or design process, thereby ensuring that the performance of the wind power generation system in which the wind turbine is located reaches the expected target or is close to the optimal state.

[0114] See also Figure 4 , Figure 4A method flow chart of a difference curve optimization method provided in an embodiment of the present application can be implemented through steps C1-C3:

[0115] C1: If the difference curve does not meet the convergence condition, the latest instantiated transfer function is used to replace the original instantiated transfer function to repeat the above steps B2-B5, thereby obtaining a new calculated difference.

[0116] First, check whether the difference curve has reached the convergence condition, that is, whether the difference curve has a stable upper boundary value. If not, repeat the above steps of B2 intermediate impedance parameter calculation, B3 intermediate amplitude-frequency characteristic calculation, B4 difference calculation and B5 new instance parameter setting to obtain a new calculated difference.

[0117] C2: adjusting the difference curve based on the new calculated difference to obtain a new difference curve.

[0118] After a new calculated difference is obtained by calculation, it is necessary to add the new calculated difference to the difference curve to obtain a new difference curve, so as to further observe whether the new difference curve meets the convergence condition.

[0119] C3: If the new difference curve still does not meet the convergence condition, repeat the above steps C1 and C2 based on the new difference curve until the latest difference curve meets the convergence condition.

[0120] If the new difference curve still does not meet the set convergence condition, then the following steps are performed according to the new difference curve: First, repeat step C1 to calculate new calculated differences, and then continue to perform step C2 to adjust the difference curve according to these new calculated differences. Repeat these steps until the latest difference curve meets the set convergence condition. Through this iterative process, parameter settings or control strategies can be continuously optimized to ensure that system stability and performance meet expected requirements.

[0121] Based on the contents of S101-S103, it can be known that the target input voltage is first determined and applied to the target wind turbine to obtain the corresponding target output current. This process is a direct measurement of the performance characteristics of the wind turbine. By calculating the ratio between the target input voltage and the target output current, the ideal amplitude-frequency characteristics of the target wind turbine can be derived, and the electrical transfer function of the wind power generation system where the wind turbine is located can be established. On this basis, combined with the H∞ control method, the stability and robustness requirements of the wind turbine system are comprehensively considered, and then the target impedance parameters of the target wind turbine are calculated, including the target inductance and the target resistance. This application not only improves the performance design accuracy by comprehensively analyzing the ideal amplitude-frequency characteristics and electrical transfer function of the wind turbine, and adopts the H∞ control strategy to calculate the required impedance parameters, but also is applicable to a variety of wind power generation systems, and enhances the adaptability and compatibility of the method for determining the impedance parameters of the wind turbine. Compared with complex optimization techniques such as genetic algorithms and particle swarm optimization, this application directly calculates based on the amplitude-frequency characteristics and transfer function, avoiding lengthy search processes and initial parameter settings, and improving efficiency while ensuring high efficiency.

[0122] See also Figure 5 , Figure 5 The structure diagram of a device for determining impedance parameters of a wind turbine generator provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the device for determining the impedance parameters of a wind turbine generator comprises:

[0123] A first determining unit 501, configured to determine a target input voltage;

[0124] An input unit 502, used for inputting the target input voltage into a target wind turbine to obtain a target output current;

[0125] A second determining unit 503 is used to determine the ratio of the target input voltage to the target output current as the ideal amplitude-frequency characteristic of the target wind turbine, and determine the electrical transfer function of the target wind turbine;

[0126] A first calculation unit 504 is used to calculate the target impedance parameter of the target wind turbine based on the ideal amplitude-frequency characteristic and the electrical transfer function in combination with an H∞ control method;

[0127] The target impedance parameters include a target inductance and a target resistance of the target wind turbine.

[0128] In a possible implementation, the first calculating unit 504 specifically includes:

[0129] A first setting unit, used to set the preliminary impedance parameters of the target wind turbine;

[0130] The second determination unit is used to determine the target impedance parameter of the target wind turbine by using the H∞ control method in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition.

[0131] In a possible implementation manner, the second determining unit specifically includes:

[0132] A second calculation unit is used to calculate an instantiated transfer function of the target wind turbine based on a plurality of preliminary impedance parameters within a target angular frequency range of the target wind turbine; the instantiated transfer function is the electrical transfer function into which the preliminary impedance parameters are substituted;

[0133] A third calculation unit, calculating an intermediate impedance parameter of the target wind turbine based on the constraint condition, the instantiated transfer function and a preset upper limit value;

[0134] a fourth calculation unit, configured to calculate an intermediate amplitude-frequency characteristic based on the intermediate impedance parameter and the impedance parameter calculation formula; the intermediate amplitude-frequency characteristic is the electrical transfer function into which the intermediate impedance parameter is substituted; the impedance parameter calculation formula is L′=K(s)′, K(s)′=R1+S·L1, L′ is the intermediate amplitude-frequency characteristic, R1 is the intermediate resistance in the intermediate impedance parameter, and L1 is the intermediate inductance in the intermediate impedance parameter; S is a complex frequency variable in Laplace transform, S=j*ω, j is an imaginary unit, and ω is a target angular frequency;

[0135] a fifth calculation unit, configured to make a difference between the intermediate amplitude-frequency characteristic and the ideal amplitude-frequency characteristic, and take a modulus value of the difference as a calculated difference;

[0136] The second setting unit is used to set the intermediate amplitude-frequency characteristic as a new instantiated transfer function.

[0137] A synthesis unit, used to combine the H∞ control method, use a new instantiated transfer function to replace the original instantiated transfer function, repeat the above steps of intermediate impedance parameter calculation, intermediate amplitude-frequency characteristic calculation, calculation difference calculation and intermediate impedance parameter substitution, and record the calculation difference obtained by each calculation;

[0138] A difference curve drawing unit, used for drawing a difference curve based on all the calculated differences; the intermediate differences have a one-to-one correspondence with the preliminary impedance parameters;

[0139] A screening unit is used to use the intermediate impedance parameter with the smallest corresponding calculated difference as the target impedance parameter if the difference curve satisfies the convergence condition; the convergence condition includes that the difference curve converges to the preset upper limit value.

[0140] In a possible implementation, the restriction condition includes: a first restriction condition and a second restriction condition;

[0141] The first restriction condition is:

[0142] The second restriction condition is: (X+1) * ·(1+X c )+(1+X c ) * ·(1+X c )>0;

[0143] Wherein, X is the electrical transfer function, X=K(s)=R+S·L, R is the preliminary resistance in the preliminary impedance parameters, L is the preliminary inductance in the preliminary impedance parameters; S is the complex frequency variable in the Laplace transform, S=j*ω, j is the imaginary unit, ω is the target angular frequency; L d is the ideal amplitude-frequency characteristic; γ is the preset upper limit value; I is the unit matrix; (XL d ) * For (XL d )'s conjugate complex number; X c Pass a function to the instantiation.

[0144] In a possible implementation manner, the device further includes:

[0145] A first repetitive execution unit, if the difference curve does not meet the convergence condition, is used to replace the original instantiated transfer function with the latest instantiated transfer function to repeat the above steps of calculating the intermediate impedance parameter, calculating the intermediate amplitude-frequency characteristic, calculating the difference and substituting the intermediate impedance parameter, so as to obtain a new calculated difference;

[0146] a second repetitive execution unit, configured to adjust the difference curve based on the new calculated difference to obtain a new difference curve;

[0147] The difference curve adjustment unit is used to repeat the above steps of calculating a new difference and adjusting the difference curve based on the new difference curve if the new difference curve still does not meet the convergence condition, until the latest difference curve meets the convergence condition.

[0148] In addition, an embodiment of the present application also provides a device for determining the impedance parameters of a wind turbine, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for determining the impedance parameters of the wind turbine as described above is implemented.

[0149] In addition, an embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a terminal device, the terminal device executes the method for determining the impedance parameters of a wind turbine generator as described above.

[0150] The embodiment of the present application provides a device for determining the impedance parameters of a wind turbine generator. The target input voltage is first determined by a first determination unit 501, and the target input voltage is input into the target wind turbine generator by an input unit 502 to obtain a target output current. Then, the ratio of the target input voltage to the target output current is determined as the ideal amplitude-frequency characteristic of the target wind turbine generator by a second determination unit 503, and the electrical transfer function of the target wind turbine generator is determined, so that the first calculation unit 504 calculates the target impedance parameters of the target wind turbine generator based on the ideal amplitude-frequency characteristic and the electrical transfer function and in combination with the H∞ control method. The present application combines the H∞ control strategy, analyzes the target wind turbine generator using the ideal amplitude-frequency characteristic and the electrical transfer function to calculate the required impedance parameters, which not only improves the design accuracy, but also is applicable to various wind power generation systems, and enhances the adaptability and compatibility of the impedance parameter determination method. Compared with complex optimization techniques, such as genetic algorithms or particle swarm optimization, the present application directly calculates based on the amplitude-frequency characteristic and the transfer function, eliminating the lengthy search process and the initial parameter setting stage, and improving the efficiency of determining the impedance parameters of the wind turbine generator while maintaining high efficiency.

[0151] The above is a detailed introduction to a method, device, equipment and storage medium for determining impedance parameters of a wind turbine provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0152] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0153] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A method for determining impedance parameters of a wind turbine generator, characterized in that: The method comprises: Determining a target input voltage, and inputting the target input voltage into a target wind turbine to obtain a target output current; Determine the ratio of the target input voltage to the target output current as the ideal amplitude-frequency characteristic of the target wind turbine, and determine the electrical transfer function of the target wind turbine; Based on the ideal amplitude-frequency characteristic and the electrical transfer function, in combination with the H∞ control method, the target impedance parameter of the target wind turbine is calculated; The target impedance parameters include a target inductance and a target resistance of the target wind turbine.

2. The method according to claim 1, characterized in that The step of calculating the target impedance parameter of the target wind turbine generator based on the ideal amplitude-frequency characteristic and the electrical transfer function in combination with the H∞ control method includes: Setting preliminary impedance parameters of the target wind turbine; The target impedance parameter of the target wind turbine is determined by utilizing the H∞ control method in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition.

3. The method according to claim 2, characterized in that The method of using the H∞ control method, in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition, to determine the target impedance parameter of the target wind turbine generator comprises: In the target angular frequency range of the target wind turbine, an instantiated transfer function of the target wind turbine is calculated based on a plurality of preliminary impedance parameters; the instantiated transfer function is the electrical transfer function into which the preliminary impedance parameters are substituted; Calculating an intermediate impedance parameter of the target wind turbine based on the constraint condition, the instantiated transfer function and a preset upper limit value; Based on the intermediate impedance parameter and the impedance parameter calculation formula, an intermediate amplitude-frequency characteristic is calculated; the intermediate amplitude-frequency characteristic is the electrical transfer function into which the intermediate impedance parameter is substituted; the impedance parameter calculation formula is L′=K(s)′, K(s)′=R1+S·L1, L′ is the intermediate amplitude-frequency characteristic, R1 is the intermediate resistance in the intermediate impedance parameter, and L1 is the intermediate inductance in the intermediate impedance parameter; S is a complex frequency variable in Laplace transform, S=j*ω, j is an imaginary unit, and ω is a target angular frequency; Subtracting the intermediate amplitude-frequency characteristic from the ideal amplitude-frequency characteristic, and taking the modulus of the difference as the calculated difference; Setting the intermediate amplitude-frequency characteristic as a new instantiated transfer function; In combination with the H∞ control method, a new instantiated transfer function is used to replace the original instantiated transfer function, so as to repeat the above steps of calculating the intermediate impedance parameter, calculating the intermediate amplitude-frequency characteristic, calculating the difference, and substituting the intermediate impedance parameter, and record the calculated difference obtained by each calculation; Draw a difference curve based on all the calculated differences; the intermediate differences have a one-to-one correspondence with the preliminary impedance parameters; If the difference curve satisfies the convergence condition, the intermediate impedance parameter with the smallest corresponding calculated difference is used as the target impedance parameter; the convergence condition includes that the difference curve converges to the preset upper limit value.

4. The method according to claim 2 or 3, characterized in that: The restriction conditions include: a first restriction condition and a second restriction condition; The first restriction condition is: The second restriction condition is: (X+1) * ·(1+X c )+(1+X c ) * ·(1+X c )>0; Wherein, X is the electrical transfer function, X=K(s)=R+S·L, R is the preliminary resistance in the preliminary impedance parameters, L is the preliminary inductance in the preliminary impedance parameters; S is the complex frequency variable in the Laplace transform, S=j*ω, j is the imaginary unit, ω is the target angular frequency; L d is the ideal amplitude-frequency characteristic; γ is the preset upper limit value; I is the unit matrix; (XL d ) * For (XL d )'s conjugate complex number; X c Pass a function to the instantiation.

5. The method according to claim 3, characterized in that: The method further comprises: If the difference curve does not meet the convergence condition, the latest instantiated transfer function is used to replace the original instantiated transfer function, so as to repeat the above steps of calculating the intermediate impedance parameter, calculating the intermediate amplitude-frequency characteristic, calculating the difference and substituting the intermediate impedance parameter, so as to obtain a new calculated difference; adjusting the difference curve based on the new calculated difference to obtain a new difference curve; If the new difference curve still does not meet the convergence condition, the above steps of calculating a new difference and adjusting the difference curve are repeated based on the new difference curve until the latest difference curve meets the convergence condition.

6. A device for determining impedance parameters of a wind turbine generator, characterized in that: The device comprises: A first determining unit, configured to determine a target input voltage; An input unit, used for inputting the target input voltage into a target wind turbine to obtain a target output current; a second determining unit, configured to determine a ratio of the target input voltage to the target output current as an ideal amplitude-frequency characteristic of the target wind turbine generator, and determine an electrical transfer function of the target wind turbine generator; A first calculation unit, configured to calculate a target impedance parameter of the target wind turbine generator based on the ideal amplitude-frequency characteristic and the electrical transfer function in combination with an H∞ control method; The target impedance parameters include a target inductance and a target resistance of the target wind turbine.

7. The device according to claim 6, characterized in that The first calculation unit specifically includes: A first setting unit, used to set the preliminary impedance parameters of the target wind turbine; The second determination unit is used to determine the target impedance parameter of the target wind turbine by using the H∞ control method in combination with the ideal amplitude-frequency characteristic, the electrical transfer function, the preliminary impedance parameter, the impedance parameter calculation formula, the restriction condition and the convergence condition.

8. The device according to claim 7, characterized in that The second determining unit specifically includes: A second calculation unit is used to calculate an instantiated transfer function of the target wind turbine based on a plurality of preliminary impedance parameters within a target angular frequency range of the target wind turbine; the instantiated transfer function is the electrical transfer function into which the preliminary impedance parameters are substituted; A third calculation unit, calculating an intermediate impedance parameter of the target wind turbine based on the constraint condition, the instantiated transfer function and a preset upper limit value; a fourth calculation unit, configured to calculate an intermediate amplitude-frequency characteristic based on the intermediate impedance parameter and the impedance parameter calculation formula; the intermediate amplitude-frequency characteristic is the electrical transfer function into which the intermediate impedance parameter is substituted; the impedance parameter calculation formula is L′=K(s)′, K(s)′=R1+S·L1, L′ is the intermediate amplitude-frequency characteristic, R1 is the intermediate resistance in the intermediate impedance parameter, and L1 is the intermediate inductance in the intermediate impedance parameter; S is a complex frequency variable in Laplace transform, S=j*ω, j is an imaginary unit, and ω is a target angular frequency; a fifth calculation unit, configured to make a difference between the intermediate amplitude-frequency characteristic and the ideal amplitude-frequency characteristic, and take a modulus value of the difference as a calculated difference; A second setting unit, used to set the intermediate amplitude-frequency characteristic to a new instantiated transfer function; A synthesis unit, used to combine the H∞ control method, use a new instantiated transfer function to replace the original instantiated transfer function, repeat the above steps of intermediate impedance parameter calculation, intermediate amplitude-frequency characteristic calculation, calculation difference calculation and intermediate impedance parameter substitution, and record the calculation difference obtained by each calculation; A difference curve drawing unit, used for drawing a difference curve based on all the calculated differences; the intermediate differences have a one-to-one correspondence with the preliminary impedance parameters; A screening unit is used to use the intermediate impedance parameter with the smallest corresponding calculated difference as the target impedance parameter if the difference curve satisfies the convergence condition; the convergence condition includes that the difference curve converges to the preset upper limit value.

9. A device for determining impedance parameters of a wind turbine generator, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for determining the impedance parameters of a wind turbine generator as described in any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed on a terminal device, the terminal device executes the method for determining the impedance parameters of a wind turbine generator as described in any one of claims 1 to 5.

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