A method, system and storage medium for identifying low voltage ride-through parameters of a wind turbine

Abstract

The present invention discloses a method, system and storage medium for identifying low voltage ride-through parameters of a wind turbine, and relates to the technical field of new energy power generation grid connection, including the steps of: obtaining a ride-through data vector data set of a wind turbine; determining a low voltage ride-through active current instruction model and identifying corresponding model parameters; determining a low voltage ride-through reactive current instruction model and identifying corresponding model parameters. The method of the present invention calculates the error of the model under different modes, and preferably selects the simulation model with the smallest error and the corresponding model parameters, and finally realizes the selection of the optimal simulation model and model parameter identification; realizes the automatic optimal identification of the low voltage ride-through parameters of the wind turbine, and utilizes computing resources to greatly improve the optimization efficiency and effect of the low voltage ride-through parameter identification of the wind turbine, which can effectively improve the quality and efficiency of parameter identification, and solves the problem that the low voltage ride-through parameter identification of the wind turbine in the existing conventional method adopts manual calculation, and the parameter identification takes a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy power generation and grid connection, and in particular to a method, system and storage medium for identifying low voltage ride-through parameters of a wind turbine. Background Art

[0002] With the depletion of fossil energy, tight supply, and severe climate change, countries around the world have realized the importance of developing renewable energy and attach great importance to the development of wind power and photovoltaics. New energy industries such as wind power and photovoltaics have developed rapidly. The access of a large number of new energy sources to the power grid has brought a series of major impacts on the safety and stability of the power system: random power changes caused by changes in wind power and light; short-circuit current characteristics and active and reactive power change characteristics during system failures; steady-state reactive power control characteristics; the impact of large-scale new energy access to the system to replace the original conventional power supply on the transient, dynamic, and medium- and long-term stability of the power system. In order to meet these challenges, it is necessary to establish a new energy unit model based on measured data in the simulation analysis of the power system.

[0003] High-precision wind turbine simulation models are the basis for large-scale wind power grid-connected transient stability analysis, and electromechanical transient simulation models are currently the most widely used models in power system simulation. The control structure of existing wind turbines is complex, and the control strategy involves commercial secrets, which are difficult to obtain accurately. At present, the general wind turbine model has basically matured. Under the premise of a fixed model structure, model parameters are the key to accurate simulation. In the Power System Comprehensive Analysis Program (PSASP), model selection and parameter identification are the key to achieving accurate simulation of low voltage ride-through of wind turbines. However, there are many types of low voltage ride-through models in the existing technology, corresponding to different model parameters, and there are technical problems that make it difficult to accurately select models and identify parameters.

[0004] In view of this, it is necessary to propose a method, system and storage medium for identifying low voltage ride-through parameters of a wind turbine to solve or at least partially solve the above technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a method, system and storage medium for identifying low voltage ride-through parameters of a wind turbine, aiming to solve the technical problem in the prior art that there are many types of low voltage ride-through models, it is difficult to accurately select models and perform parameter identification according to actual conditions, resulting in low accuracy of low voltage ride-through simulation of wind turbines.

[0006] To achieve the above object, the present invention provides a method for identifying low voltage ride-through parameters of a wind turbine, comprising the steps of: S10, obtaining a ride-through data vector data set composed of N low voltage ride-through data of the wind turbine, the ride-through data vector data set including a front-end voltage vector set , Active power vector set before crossing , reactive power vector set before crossing , Active current vector set before crossing , reactive current vector set before crossing , through the machine end voltage vector set , Active power vector set in crossing , reactive power vector set during crossing , Active current vector set in crossing , reactive current vector set in the crossing , N is a positive integer;

[0007] S20, determining a low voltage ride through active current command model and identifying corresponding model parameters, specifically including:

[0008] S21, establish a low voltage ride through active current command general model through the power system comprehensive analysis program (PSASP), the low voltage ride through active current command general model includes active current specified power general model and active current specified current general model,

[0009] The model parameters of the general model of active current specified power include active power calculation coefficient 、Active power calculation coefficient 2 , Active power during the ride , Active power before crossing ;

[0010] The model parameters of the general model for active current specification current include active current calculation coefficient 、Active current calculation coefficient 2 , Active current calculation coefficient three , Active current before crossing , terminal voltage during riding ;

[0011] S22, using the formula Calculate the reference parameters of the active current specified power general model, where the reference parameters Including the first element and the second element Two elements determine the active power calculation coefficient , determine the active power calculation coefficient two ,in, , is a constant vector, , I contains N elements that are 1, ;

[0012] S23, according to the reference parameters Active power parameter identification error of the general model for calculating active current specified power ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. elements;

[0013] S24, using the formula Calculate the reference parameters of the current general model for active current specification, where the reference parameters Contains the first element , the second element And the third element Three elements determine the active current calculation coefficient , determine the active current calculation coefficient two , determine the active current calculation coefficient three ,in, , ;

[0014] S25, according to the reference parameters Calculation of active current specified current parameter identification error of the general model of active current specified current ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. The element in row and column 3, yes No. elements,

[0015] S26, if the active specified current parameter identification error Greater than or equal to the active specified power parameter identification error , then the general model of active current specified power is determined to be the low voltage ride through active current command model, and the first element is identified and the second element are model parameters;

[0016] If the active current parameter identification error Less than the active specified power parameter identification error , then the general model of active current specified current is determined to be the low voltage ride through active current instruction model, and the first element is identified , the second element And the third element is the model parameter.

[0017] Furthermore, the method further includes step S30, determining a low voltage ride through reactive current command model and identifying corresponding model parameters, specifically including:

[0018] S31, establish a low voltage ride through reactive current instruction general model through the power system comprehensive analysis program (PSASP), the low voltage ride through reactive current instruction general model includes a reactive current specified power general model and a reactive current specified current general model,

[0019] The model parameters of the general model for reactive current specified power include reactive power calculation coefficient 、Reactive power calculation coefficient 2 , Reactive power during ride-through , reactive power before crossing ,

[0020] The model parameters of the general model for reactive current designation include the reactive current calculation coefficient 、Reactive current calculation coefficient 2 , Reactive current calculation coefficient three , reactive current before crossing , terminal voltage during riding , enter the low voltage ride-through threshold .

[0021] S32, using the formula Calculate the reference parameters of the reactive current specified power general model, where the reference parameters Contains the first element and the second element Two elements determine the reactive power calculation coefficient , determine the reactive power calculation coefficient two , , is a constant vector, , I contains N elements that are 1, ;

[0022] S33, according to the reference parameters Reactive power parameter identification error of the general model for calculating reactive current specified power ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes The first element of yes The second element of yes No. elements;

[0023] S34, using formula Calculate the reactive current and specify the reference parameters of the general current model, where the reference parameters Including the first element , the second element And the third element Three elements determine the reactive power calculation coefficient , determine the reactive power calculation coefficient two , determine the reactive current calculation coefficient three , , ;

[0024] S35, according to the reference parameters Calculation of reactive current specified current parameter identification error of the general model of reactive current specified current ,in, , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. The element in row and column 3, yes No. elements;

[0025] S36, if the reactive specified current parameter identification error Greater than or equal to the reactive power specified parameter identification error , then the general model of reactive current specified power is determined to be the low voltage ride-through reactive current command model, and the first element is identified and the second element are model parameters;

[0026] If the reactive current parameter identification error Less than the reactive power parameter identification error , then the general model of reactive current specified current is determined to be the low voltage ride-through reactive current instruction model, and the first element is identified , the second element And the third element The three elements are model parameters.

[0027] Furthermore, the voltage vector set of the front generator is ,

[0028] Active power vector set before crossing ,

[0029] Reactive power vector set before crossing ,

[0030] Active current vector set before crossing ,

[0031] Reactive current vector set before crossing ,

[0032] Voltage vector set of the machine end during the crossing ,

[0033] Active power vector set in crossing ,

[0034] Reactive power vector set in the crossing ,

[0035] Active current vector set in crossing ,

[0036] Reactive current vector set in the through .

[0037] Furthermore, the general model of active current specified power is , the general model of active current is specified as .

[0038] Furthermore, the general model of reactive current specified power is , the general model of reactive current specified current is .

[0039] The present invention also provides a low voltage ride through parameter identification system for a wind turbine generator set, comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the steps of the above-mentioned low voltage ride through parameter identification method for a wind turbine generator set.

[0040] The present invention also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be programmed or configured by a microprocessor to execute the steps of the above-mentioned wind turbine low voltage ride-through parameter identification method.

[0041] Compared with the prior art, the method for identifying low voltage ride-through parameters of a wind turbine provided by the present invention has the following beneficial effects:

[0042] The present invention provides a method for identifying low voltage ride-through parameters of a wind turbine generator set. First, the model reference parameters of each model in two different modes, active and reactive, are calculated according to N groups of low voltage ride-through data of the wind turbine generator set. The low voltage ride-through active current instruction general model has reference parameters of an active current specified power general model and reference parameters of an active current specified current general model, and the low voltage ride-through reactive current instruction general model has reference parameters of a reactive current specified power general model and reference parameters of a reactive current specified current general model. Then, the errors of the models in different modes are calculated, and the simulation model with the smallest error and the corresponding model parameters are selected, so as to finally realize the selection of the optimal simulation model and model parameter identification. The automatic optimal identification of the low voltage ride-through parameters of the wind turbine generator set is realized, and the optimization efficiency and effect of the low voltage ride-through parameter identification of the wind turbine generator set is greatly improved by using computing resources, so as to effectively improve the quality and efficiency of parameter identification, and solve the problem that the low voltage ride-through parameter identification of the wind turbine generator set in the existing conventional method adopts manual calculation, the parameter identification effect depends on the specific personnel level and the parameter identification takes a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0044] Figure 1 It is a flow chart of the low voltage ride through parameter identification method of a wind turbine generator set of the present invention;

[0045] Figure 2 It is a schematic diagram of the calibration curve when the drop depth is 0.37 pu in the verification experiment of the present invention; wherein, a is a schematic diagram of the terminal voltage calibration curve, b is a schematic diagram of the active power calibration curve, c is a schematic diagram of the reactive power calibration curve, d is a schematic diagram of the active current calibration curve, and e is a schematic diagram of the reactive current calibration curve;

[0046] Figure 3 It is a schematic diagram of the calibration curve when the drop depth is 0.46 pu in the verification experiment of the present invention; wherein, a is a schematic diagram of the terminal voltage calibration curve, b is a schematic diagram of the active power calibration curve, c is a schematic diagram of the reactive power calibration curve, d is a schematic diagram of the active current calibration curve, and e is a schematic diagram of the reactive current calibration curve;

[0047] Figure 4It is a schematic diagram of the calibration curve when the drop depth is 0.55pu in the verification experiment of the present invention; wherein, a is a schematic diagram of the machine-end voltage calibration curve, b is a schematic diagram of the active power calibration curve, c is a schematic diagram of the reactive power calibration curve, d is a schematic diagram of the active current calibration curve, and e is a schematic diagram of the reactive current calibration curve.

[0048] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0049] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] Please refer to Figure 1 The present invention provides a method for identifying low voltage ride-through parameters of a wind turbine, comprising the steps of: S10, obtaining a ride-through data vector data set composed of N low voltage ride-through data of the wind turbine, the ride-through data vector data set including a front-end voltage vector set , Active power vector set before crossing , reactive power vector set before crossing , Active current vector set before crossing , reactive current vector set before crossing , through the machine end voltage vector set , Active power vector set in crossing , reactive power vector set during crossing , Active current vector set in crossing , reactive current vector set in the crossing , N is a positive integer;

[0053] S20, determining a low voltage ride through active current command model and identifying corresponding model parameters, specifically including:

[0054] S21, establish a low voltage ride through active current command general model through the power system comprehensive analysis program (PSASP), the low voltage ride through active current command general model includes active current specified power general model and active current specified current general model,

[0055] The model parameters of the general model of active current specified power include active power calculation coefficient 、Active power calculation coefficient 2 , Active power during the ride , Active power before crossing ;

[0056] The model parameters of the general model for active current specification current include active current calculation coefficient 、Active current calculation coefficient 2 , Active current calculation coefficient three , Active current before crossing , terminal voltage during riding ;

[0057] S22, using the formula Calculate the reference parameters of the active current specified power general model, where the reference parameters Including the first element and the second element Two elements determine the active power calculation coefficient , determine the active power calculation coefficient two ,in, , is a constant vector, , I contains N elements that are 1, ;

[0058] S23, according to the reference parameters Active power parameter identification error of the general model for calculating active current specified power ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. elements;

[0059] S24, using the formula Calculate the reference parameters of the current general model for active current specification, where the reference parameters Contains the first element , the second element And the third element Three elements determine the active current calculation coefficient , determine the active current calculation coefficient two , determine the active current calculation coefficient three ,in, , ;

[0060] S25, according to the reference parameters Calculation of active current specified current parameter identification error of the general model of active current specified current ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. The element in row and column 3, yes No. elements;

[0061] S26, if the active specified current parameter identification error Greater than or equal to the active specified power parameter identification error , then the general model of active current specified power is determined to be the low voltage ride through active current command model, and the first element is identified and the second element are model parameters;

[0062] If the active current parameter identification error Less than the active specified power parameter identification error , then the general model of active current specified current is determined to be the low voltage ride through active current instruction model, and the first element is identified , the second element And the third element is the model parameter.

[0063] The present invention provides a method for identifying low voltage ride-through parameters of a wind turbine, which obtains a ride-through data vector data set composed of N low voltage ride-through data of the wind turbine, and calculates reference parameters of respective models in two different active and reactive modes according to the ride-through data vector data set, wherein the low voltage ride-through active current instruction general model includes an active current specified power general model and an active current specified current general model, each model having corresponding reference parameters, and the low voltage ride-through reactive current instruction general model includes a reactive current specified power general model and a reactive current specified current general model, each model having corresponding reference parameters; then, the errors of the models in different modes are calculated, and the simulation model with the smallest error and the corresponding reference parameters are preferably selected, and finally the selection of the optimal simulation model and parameter identification are realized; the automatic optimal identification of the low voltage ride-through parameters of the wind turbine is realized, and the optimization efficiency and effect of the low voltage ride-through parameter identification of the wind turbine is greatly improved by using computing resources, which can effectively improve the quality and efficiency of parameter identification, and solve the problem that the low voltage ride-through parameter identification of the wind turbine in the existing conventional method adopts manual calculation, the parameter identification effect depends on the specific personnel level and the parameter identification is time-consuming.

[0064] Understandably, The -1 in represents the inverse matrix; After expressing the absolute value, sum it up.

[0065] Furthermore, the method further includes step S30, determining a low voltage ride through reactive current command model and identifying corresponding model parameters, specifically including:

[0066] S31, establish a low voltage ride through reactive current instruction general model through the power system comprehensive analysis program (PSASP), the low voltage ride through reactive current instruction general model includes a reactive current specified power general model and a reactive current specified current general model,

[0067] The model parameters of the general model for reactive current specified power include reactive power calculation coefficient 、Reactive power calculation coefficient 2 , Reactive power during ride-through , reactive power before crossing ,

[0068] The model parameters of the general model for reactive current designation include the reactive current calculation coefficient 、Reactive current calculation coefficient 2 , Reactive current calculation coefficient three , reactive current before crossing , terminal voltage during riding , enter the low voltage ride-through threshold .

[0069] S32, using the formula Calculate the reference parameters of the reactive current specified power general model, where the reference parameters Contains the first element and the second element Two elements determine the reactive power calculation coefficient , determine the reactive power calculation coefficient two , , is a constant vector, , I contains N elements that are 1, ;

[0070] S33, according to the reference parameters Reactive power parameter identification error of the general model for calculating reactive current specified power ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes The first element of yes The second element of yes No. elements;

[0071] S34, using formula Calculate the reactive current and specify the reference parameters of the general current model, where the reference parameters Including the first element , the second element And the third element Three elements determine the reactive power calculation coefficient , determine the reactive power calculation coefficient two , determine the reactive current calculation coefficient three , , ;

[0072] S35, according to the reference parameters Calculation of reactive current specified current parameter identification error of the general model of reactive current specified current ,in, , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. The element in row and column 3, yes No. elements;

[0073] S36, if the reactive specified current parameter identification error Greater than or equal to the reactive power specified parameter identification error , then the general model of reactive current specified power is determined to be the low voltage ride-through reactive current command model, and the first element is identified and the second element are model parameters;

[0074] If the reactive current parameter identification error Less than the reactive power parameter identification error , then the general model of reactive current specified current is determined to be the low voltage ride-through reactive current instruction model, and the first element is identified , the second element And the third element The three elements are model parameters.

[0075] It can be understood that in step S34, is the low voltage ride-through threshold, It is the voltage vector set at the machine end.

[0076] Furthermore, the voltage vector set of the front generator is ,

[0077] Active power vector set before crossing ,

[0078] Reactive power vector set before crossing ,

[0079] Active current vector set before crossing ,

[0080] Reactive current vector set before crossing ,

[0081] Voltage vector set of the generator terminal ,

[0082] Active power vector set in crossing ,

[0083] Reactive power vector set in the crossing ,

[0084] Active current vector set in crossing ,

[0085] Reactive current vector set in the through-pass .

[0086] It can be understood that in the present invention, the traversal data vector data set is represented by a bias matrix.

[0087] Furthermore, the general model of active current specified power is , the general model of active current specified current is .

[0088] Furthermore, the general model of reactive current specified power is , the general model of reactive current specified current is .

[0089] In the present invention, a 2.5MW doubly-fed wind turbine is taken as an implementation object, and a specific low voltage ride-through parameter identification method for the wind turbine is provided as follows:

[0090] First, data preparation:

[0091] A plurality of low voltage ride-through hardware-in-the-loop test data of the wind turbine are extracted by manual processing (used to extract the raw data of the ride-through data vector data set), and the ride-through data vector data set is processed to form the ride-through data vector data set. The ride-through data vector data set includes

[0092] Voltage vector set of the generator terminal before crossing ,

[0093] Active power vector set before crossing ,

[0094] Reactive power vector set before crossing ,

[0095] Active current vector set before crossing ,

[0096] Reactive current vector set before crossing ,

[0097] Voltage vector set of the generator terminal ,

[0098] Active power vector set in crossing ,

[0099] Reactive power vector set in the crossing ,

[0100] Active current vector set in crossing ,

[0101] Reactive current vector set in the through-pass ,in, ; Construct constant vector , I contains N elements, each element value is 1.

[0102] Second, the selection of low voltage ride-through active current command model and the corresponding model parameter identification:

[0103] According to the formula Calculate the reference parameters of the specified power model for the low voltage ride through active current and obtain the reference parameters , the reference parameter contains two elements, the first element is the active power calculation coefficient The calculation result is , the second element yes The calculation result is ;

[0104] According to the above reference parameters Calculation of active specified power parameter identification error of the general model for active current specified power of low voltage ride through ;

[0105] According to the formula Calculate the reference parameters of the specified current model for the low voltage ride through active current and obtain the reference parameters , contains three elements, among which the first element is the active current calculation coefficient The calculation result is , the second element Is the active current calculation coefficient two The calculation result is ; The third element is the active current calculation coefficient three The calculation result is ;

[0106] According to the above reference parameters Calculation of active specified current parameter identification error of active current specified current model for low voltage ride through ;

[0107] at this time, , then select the active current specified power general model as the low voltage ride through active current command model, and identify the first element and the second element are model parameters;

[0108] Third, the selection of low voltage ride-through reactive current command model and the first model parameter identification:

[0109] According to the formula Calculate the model parameters of the universal model of the low voltage ride-through reactive current specified power and obtain the reference parameters , where the first element is the reactive power calculation factor The calculation result is , the second element is the reactive power calculation factor 2 The calculation result is ;

[0110] According to the above reference parameters Reactive specified power parameter identification error of general model for calculating reactive current specified power of low voltage ride through ;

[0111] According to the formula Calculate the reference parameters of the universal model of low voltage ride-through specified current and obtain the reference parameters , where the first element is the reactive current calculation coefficient The calculation result is , the second element is the reactive current calculation coefficient 2 The calculation result is , the third element is the reactive current calculation coefficient three The calculation result is ;

[0112] According to the reference parameters Calculation of reactive specified current parameter identification error of universal model for low voltage ride through specified current ;

[0113] at this time, , determine the reactive current specified current general model as the low voltage ride through reactive current command model, identify the first element , the second element And the third element The three elements are model parameters.

[0114] In the Power System Analysis Program (PSASP), the active current specified current model and the identified model parameters, the reactive current specified current model and the identified model parameters are set to the 12-type generator model, and the model is calibrated in accordance with the "Verification Procedure for Electrical Simulation Models of Wind Turbines" (NB / T 31053-2021). The calibration curve is as follows Figure 2 , Figure 3 as well as Figure 4 As shown, the simulation verification indicators are shown in Table 1, Table 2 and Table 3:

[0115]

[0116]

[0117]

[0118] In the present invention, the maximum allowable value of the verification deviation of the electromechanical transient model of the fault ride-through characteristics specified in the "Verification Procedure for Electrical Simulation Models of Wind Turbine Generators" (NB / T 31053-2021) is shown in Table 4:

[0119]

[0120] It can be seen that all model errors in Table 1, Table 2, and Table 3 are within the allowable range of Table 4. The simulation verification results verify the availability and accuracy of the method of the present invention.

[0121] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for identifying low voltage ride-through parameters of a wind turbine generator set, characterized in that: Includes steps: S10, obtain wind turbine generator system The through data vector data set is composed of low voltage through data, and the through data vector data set includes a through front terminal voltage vector set , Active power vector set before crossing , reactive power vector set before crossing , Active current vector set before crossing , reactive current vector set before crossing , through the machine end voltage vector set , Active power vector set in crossing , reactive power vector set during crossing , Active current vector set in crossing , reactive current vector set in the crossing , is a positive integer; S20, determining a low voltage ride through active current command model and identifying corresponding model parameters, specifically including: S21, establishing a low voltage ride through active current instruction general model through a power system comprehensive analysis program, wherein the low voltage ride through active current instruction general model includes an active current specified power general model and an active current specified current general model, The model parameters of the active current specified power general model include active power calculation coefficient 、Active power calculation coefficient 2 , Active power during the ride , Active power before crossing ; The model parameters of the active current designated current general model include active current calculation coefficient 、Active current calculation coefficient 2 , Active current calculation coefficient three , Active current before crossing , terminal voltage during riding ; S22, using the formula Calculate the reference parameters of the active current specified power general model, where the reference parameters Including the first element and the second element Two elements determine the active power calculation coefficient , determine the active power calculation coefficient two ,in, , is a constant vector, , Included elements that are 1, ; S23, according to the reference parameters Active power parameter identification error of the general model for calculating active current specified power ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. elements; S24, using the formula Calculate the reference parameters of the current general model for active current specification, where the reference parameters Contains the first element , the second element And the third element Three elements determine the active current calculation coefficient , determine the active current calculation coefficient two , determine the active current calculation coefficient three ,in, , ; S25, according to the reference parameters Calculation of active current specified current parameter identification error of the general model of active current specified current ,in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. The element in row and column 3, yes No. elements, S26, if the active specified current parameter identification error Greater than or equal to the active specified power parameter identification error , then the general model of active current specified power is determined to be the low voltage ride through active current command model, and the first element is identified and the second element are model parameters; If the active current parameter identification error Less than the active specified power parameter identification error , then the general model of active current specified current is determined to be the low voltage ride through active current instruction model, and the first element is identified , the second element And the third element is the model parameter.

2. The method for identifying low voltage ride-through parameters of a wind turbine generator set according to claim 1, characterized in that: The step S30 is also included, determining the low voltage ride through reactive current instruction model and identifying the corresponding model parameters, specifically including: S31, establishing a low voltage ride through reactive current instruction general model through a power system comprehensive analysis program (PSASP), wherein the low voltage ride through reactive current instruction general model includes a reactive current specified power general model and a reactive current specified current general model, The model parameters of the reactive current specified power general model include reactive power calculation coefficient 、Reactive power calculation coefficient 2 , Reactive power during ride-through , reactive power before crossing , The model parameters of the reactive current specified current general model include reactive current calculation coefficient 1 、Reactive current calculation coefficient 2 , Reactive current calculation coefficient three , reactive current before crossing , terminal voltage during riding , enter the low voltage ride-through threshold ; S32, using the formula Calculate the reference parameters of the reactive current specified power general model, where the reference parameters Contains the first element and the second element Two elements determine the reactive power calculation coefficient , determine the reactive power calculation coefficient two , , is a constant vector, , Contains N elements that are 1, ; S33, according to the reference parameters Reactive power parameter identification error of the general model for calculating reactive current specified power , in, , , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes The first element of yes The second element of yes No. elements; S34, using formula Calculate the reactive current and specify the reference parameters of the general current model, where the reference parameters Including the first element , the second element And the third element Three elements determine the reactive power calculation coefficient , determine the reactive power calculation coefficient two , determine the reactive current calculation coefficient three , , ; S35, according to the reference parameters Calculation of reactive current specified current parameter identification error of the general model of reactive current specified current ,in, , yes No. The element in row and column 1, yes No. The element in the row and column 2, yes No. The element in row and column 3, yes No. elements; S36, if the reactive specified current parameter identification error Greater than or equal to the reactive power specified parameter identification error , then the general model of reactive current specified power is determined to be the low voltage ride-through reactive current command model, and the first element is identified and the second element are model parameters; If the reactive current parameter identification error Less than the reactive power parameter identification error , then the general model of reactive current specified current is determined to be the low voltage ride-through reactive current instruction model, and the first element is identified , the second element And the third element The three elements are model parameters.

3. The method for identifying low voltage ride-through parameters of a wind turbine generator set according to any one of claims 1 or 2, characterized in that: Voltage vector set of the generator terminal before crossing , Active power vector set before crossing , Reactive power vector set before crossing , Active current vector set before crossing , Reactive current vector set before crossing , Voltage vector set of the generator terminal , Active power vector set in crossing , Reactive power vector set in the crossing , Active current vector set in crossing , Reactive current vector set in the through .

4. The method for identifying low voltage ride-through parameters of a wind turbine generator set according to claim 1, characterized in that: The general model of active current specified power is , the general model of active current specified current is .

5. The method for identifying low voltage ride-through parameters of a wind turbine generator set according to claim 1, characterized in that: The general model for reactive current specified power is , the general model of reactive current specified current is .

6. A wind turbine low voltage ride-through parameter identification system, characterized in that: The method comprises a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the steps of the method for identifying low voltage ride-through parameters of a wind turbine generator set as claimed in any one of claims 1 to 5.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to be programmed or configured by a microprocessor to execute the steps of the low voltage ride-through parameter identification method for a wind turbine as claimed in any one of claims 1 to 5.

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