New energy unit fault ride-through parameter setting and checking method and system, storage medium and processor

Abstract

The invention relates to the technical field of power system simulation modeling, in particular to a new energy unit fault ride-through parameter setting and checking method and system, a storage medium and a processor. The method comprises the following steps of: acquiring actual measurement data of voltage, active current and reactive current of fault ride-through of the new energy unit; preprocessing the collected actual measurement data of fault ride-through of the new energy unit; setting parameters of fault ride-through of the new energy unit according to the preprocessed data; checking the set fault ride-through parameters of the new energy unit; and when the checking is not passed, checking is needed, corresponding parameters are reset, and checking is carried out again. Compared with a traditional method, a large amount of simulation calculation is not needed, and the parameter setting efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power system simulation modeling, and in particular to a method, system, storage medium and processor for setting and verifying fault ride-through parameters of a new energy unit. Background Art

[0002] With the rapid development of new power systems based on renewable energy, the impact of the ride-through characteristics of renewable energy units under fault conditions on the power system has become difficult to ignore.

[0003] Inaccurate setting of fault ride-through parameters of units in new energy plants will lead to large deviations between the electromechanical transient characteristics of the simulated power system and the electromechanical transient characteristics of the actual power system, making it difficult to meet the accuracy requirements for power system safety verification.

[0004] The setting and verification methods of fault ride-through parameters of new energy units involve many operating conditions and a large amount of data, which makes the setting and verification process complicated and tedious. In order to improve efficiency, it is of practical significance to propose practical parameter setting and verification methods. Summary of the invention

[0005] In view of the problems in the prior art, the present invention provides a method, system, storage medium and processor for setting and verifying fault ride-through parameters of a new energy unit. The specific technical solution is as follows:

[0006] A method for setting and verifying fault ride-through parameters of a new energy unit comprises the following steps:

[0007] Collect the measured data of voltage, active current and reactive current during fault ride-through of new energy units;

[0008] Pre-process the collected measured data of fault ride-through of new energy units;

[0009] Adjust the fault ride-through parameters of the new energy unit based on the pre-processed data;

[0010] Verify the fault ride-through parameters of the set new energy units;

[0011] If the calibration fails, you need to check and reset the corresponding parameters and perform the calibration again.

[0012] Preferably, the actual measured data of collecting the fault ride-through of the new energy unit is specifically as follows:

[0013] The measured data of voltage, active power and reactive power under N working conditions are collected and expressed as follows:

[0014] The measured voltage data is:

[0015] The measured data of active current is:

[0016] The measured data of reactive current is:

[0017] Among them, subscript i represents the i-th working condition, subscript j represents the j-th data, superscript m represents that the data is measured data, and subscript M is the total number of measured data; represents the voltage measured data set of the i-th working condition, represents the measured data set of active current under the i-th working condition, represents the reactive current measured data set of the i-th working condition, represents the jth voltage measured data under the i-th working condition, represents the jth active power measured data under the i-th working condition, Represents the jth reactive power measured data under the i-th working condition.

[0018] Preferably, the N operating conditions should at least include the following operating conditions: a three-phase short-circuit test condition and a two-phase short-circuit test condition;

[0019] The drop depth of the terminal voltage of the unit under the above two working conditions should include at least the following five situations: 20% U e 、35%U e , 50%U e 、75%U e 、90%U e , where U e It is the rated voltage of the unit terminal.

[0020] Preferably, the preprocessing of the collected measured data of the fault ride-through of the new energy unit includes the following steps: calculating the average drop depth of the measured voltage data during the fault period according to the measured voltage data The details are as follows:

[0021]

[0022] Where A is the starting position of the fault, l is the number of data during the fault period;

[0023] Calculate the average value of the voltage measured data before the fault The details are as follows:

[0024]

[0025] Calculate the average drop depth of the active current measured data during the fault period based on the active current measured data The details are as follows:

[0026] Calculate the average value of the active current measured data before the fault The details are as follows:

[0027]

[0028] Calculate the average drop depth of reactive current measured data during the fault period based on reactive current measured data The details are as follows:

[0029]

[0030] Calculate the average value of the active current measured data before the fault The details are as follows:

[0031]

[0032] Preferably, the step of setting the parameters of the fault ride-through of the new energy generator set according to the preprocessed data specifically comprises the following steps:

[0033] (1) Set the active current model and reactive current model during fault ride-through, as follows:

[0034] The active current model during fault ride-through is set as:

[0035] IP=K pv V 0 +K p I p0 +K p0 ; (7)

[0036] The reactive current model during fault ride-through is set as:

[0037] IQ = K qv V 0 +K q I q0 +K q0 ; (8)

[0038] Where V 0 is the voltage amplitude of the new energy unit before the fault, I p0 is the active current of the unit before the fault, I q0 is the reactive current of the unit before the fault, K pv , K p , K p0 , K qv , K q , K q0 is an undetermined parameter, where K pv is the active voltage coefficient, K p is the active current coefficient, K q0 is the active current setting value, K qvis the reactive voltage coefficient, K q is the reactive current coefficient, K q0 is the reactive current setting value;

[0039] (2) Set the optimization objective function as follows:

[0040] Set the objective function:

[0041]

[0042] The least squares method is used to solve the optimal parameter value that minimizes ΔIP: K pv―opt , K p―opt , K p0―opt ;

[0043] The least squares method is used to solve the optimal parameter value that minimizes ΔIQ: K qv―opt , K q―opt , K q0―opt ;

[0044] (3) The obtained optimal parameters are used as the active current model parameters and reactive current model parameters during the fault ride-through period to obtain the adjusted active power model and reactive power model, as follows:

[0045] IP=K pv―opt V 0 +K p―opt I p0 +K p0―opt ; (11)

[0046] IQ = K qv―opt V 0 +K q―opt I q0 +K q0―opt ; (12).

[0047] Preferably, the checking of the fault ride-through parameters of the set new energy generator set specifically comprises the following steps:

[0048] (1) Construct a single-machine infinite system of a new energy unit, wherein the single-machine infinite system means that the new energy unit constitutes a node, the infinite power source constitutes a node, and the positive sequence internal reactance of the infinite power source is X + , the negative sequence reactance is X ― , the two nodes of the new energy unit and the infinite power source are connected by a circuit;

[0049] (2) According to the measured data conditions, the initial operating conditions of the new energy unit are set, where the node voltage is equal to Active power is equal to Reactive power is equal to

[0050] (3) Based on the voltage drop after the fault under various working conditions in the measured data, the grounding resistance of the new energy unit when the single unit infinite system fails is calculated;

[0051] (4) Set the fault type and grounding resistance corresponding to the fault simulation of the new energy unit, perform fault simulation on the single-machine infinite system of the new energy unit, and obtain the voltage, active current, and reactive current simulation data under various working conditions and faults, as follows:

[0052] The voltage simulation data is:

[0053] The active current simulation data is:

[0054] The reactive current simulation data is:

[0055] The superscript s indicates that the data is simulated data. represents the voltage simulation data set of the i-th working condition, represents the active current simulation data set of the i-th working condition, represents the reactive current simulation data set of the i-th working condition, represents the jth voltage simulation data of the i-th working condition, represents the jth active current simulation data of the i-th working condition, Represents the jth active current simulation data of the i-th working condition;

[0056] (5) Calculate the error between the simulation data and the measured data under the i-th working condition, as follows:

[0057] The voltage error under the i-th working condition is:

[0058]

[0059] The active current error under the i-th working condition is:

[0060]

[0061] The reactive current error under the i-th working condition is:

[0062]

[0063] If the maximum value of the voltage error in N working conditions max(ΔU i ) is less than a given threshold ΔU max , it means that the setting of the single-machine infinite system of the new energy unit is correct; otherwise, it is necessary to check and reset the simulation conditions and parameters of the single-machine infinite system, and then perform the calibration again;

[0064] If the maximum value of the active current error in N working conditions is max(ΔIP i ) is less than a given threshold ΔIP max , then the active current model of the new energy unit after adjustment is: IP = K pv―opt V 0 +K p―opt I p0 +K p0―opt The settings are correct; otherwise, you need to check and reset the active current model parameters, and then perform the calibration again;

[0065] If the maximum value of the reactive current error in N working conditions is max(ΔIQ i ) is less than a given threshold ΔIQ max , then the active current model of the new energy unit after adjustment is: IQ=K qv―opt V 0 +K q―opt I q0 +K q0―opt The setting is correct; otherwise, you need to check and re-calibrate the reactive current model parameters and then perform the calibration again.

[0066] Preferably, the calculation of the grounding resistance is as follows:

[0067] The grounding resistance R of the three-phase short-circuit fault under the i-th working condition 3gi The calculation formula is:

[0068]

[0069] The grounding resistance R of the two-phase short circuit fault under the i-th working condition 2gi The calculation formula is:

[0070]

[0071] A setting and verification system for fault ride-through parameters of a new energy unit, applied to the method described, comprising:

[0072] Data acquisition module, collecting measured data of fault ride-through of new energy units;

[0073] A data processing module is used to pre-process the collected measured data of fault ride-through of new energy units;

[0074] The setting module is used to set the fault ride-through parameters of the new energy unit according to the pre-processed data;

[0075] The verification module is used to verify the fault ride-through parameters of the set new energy units;

[0076] The setting module is used to check and reset the corresponding parameters and perform the calibration again when the calibration fails.

[0077] A computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the method for setting and verifying the fault ride-through parameters of the new energy unit.

[0078] A processor is used to run a program, wherein the program executes the method for setting and verifying fault ride-through parameters of a new energy unit when running.

[0079] Compared with the prior art, the present invention has the following beneficial effects:

[0080] The method of the present invention comprises the steps of: collecting the measured data of voltage, active current and reactive current of the fault crossing of the new energy unit; preprocessing the collected measured data of the fault crossing of the new energy unit; setting the parameters of the fault crossing of the new energy unit according to the preprocessed data; verifying the parameters of the fault crossing of the new energy unit after the setting; when the verification fails, it is necessary to check and reset the corresponding parameters and verify again. Compared with the traditional method, the present invention does not need to perform a large number of simulation calculations, which greatly improves the efficiency of parameter setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0082] Figure 1 It is a schematic diagram of the process of the present invention.

[0083] Figure 2 20% U of three-phase short circuit e The measured data curve of voltage drop, where: Figure 2 (a) is the measured voltage data, Figure 2 (b) is the measured data of active power, Figure 2 (c) is the measured data of reactive power.

[0084] Figure 3 20% U of three-phase short circuit e The voltage drop simulation data curve, where: Figure 3 (a) is the voltage simulation data, Figure 3 (b) is the active power simulation data, Figure 3 (c) is the reactive power simulation data.

[0085] Figure 4 20% U of three-phase short circuit e Data comparison chart of voltage drop condition, Figure 4 (a) is a comparison chart of the voltage measured data and the simulated data. Figure 4 (b) is a comparison chart of the active current measured data and the simulated data. Figure 4 (c) is a comparison chart of the reactive current measured data and simulated data. DETAILED DESCRIPTION

[0086] 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 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.

[0087] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0088] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0089] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0090] Embodiment 1:

[0091] like Figure 1 As shown, this embodiment provides a method for setting and verifying fault ride-through parameters of a new energy unit, comprising the following steps:

[0092] Step S1, collecting the measured data of voltage, active current and reactive current of the new energy unit during fault ride-through.

[0093] The measured data of voltage, active power and reactive power under N working conditions are collected and expressed as follows:

[0094] The measured voltage data is:

[0095] The measured data of active current is:

[0096] The measured data of reactive current is:

[0097] Among them, subscript i represents the i-th working condition, subscript j represents the j-th data, superscript m represents that the data is measured data, and subscript M is the total number of measured data; represents the voltage measured data set of the i-th working condition, represents the measured data set of active current under the i-th working condition, represents the reactive current measured data set of the i-th working condition, represents the jth voltage measured data under the i-th working condition, represents the jth active power measured data under the i-th working condition, Represents the jth reactive power measured data under the i-th working condition.

[0098] The N operating conditions should at least include the following operating conditions: three-phase short-circuit test conditions and two-phase short-circuit test conditions;

[0099] The drop depth of the terminal voltage of the unit under the above two working conditions should include at least the following five situations: 20% U e 、35%U e , 50%U e 、75%U e 、90%U e , where U e is the rated voltage of the unit terminal. That is to say, it includes at least the above 10 operating conditions. Step S2, pre-processing the collected measured data of fault ride-through of the new energy unit. It includes the following steps:

[0100] Calculate the average drop depth of the measured voltage data during the fault period based on the measured voltage data The details are as follows:

[0101]

[0102] Where A is the starting position of the fault, and L is the number of data during the fault period;

[0103] Calculate the average value of the voltage measured data before the fault The details are as follows:

[0104]

[0105] Calculate the average drop depth of the active current measured data during the fault period based on the active current measured data The details are as follows:

[0106] Calculate the average value of the active current measured data before the fault The details are as follows:

[0107]

[0108] Calculate the average drop depth of reactive current measured data during the fault period based on reactive current measured data The details are as follows:

[0109]

[0110] Calculate the average value of the active current measured data before the fault The details are as follows:

[0111]

[0112] Step S3, adjusting the parameters of the fault ride-through of the new energy unit according to the pre-processed data. Specifically, the following steps are included:

[0113] (1) Set the active current model and reactive current model during fault ride-through, as follows:

[0114] The active current model during fault ride-through is set as:

[0115] IP=K pv V 0 +K p I p0 +K p0 ; (7)

[0116] The reactive current model during fault ride-through is set as:

[0117] IQ = K qv V 0 +K q I q0 +K q0 ; (8)

[0118] Where V 0 is the voltage amplitude of the new energy unit before the fault, I p0 is the active current of the unit before the fault, I q0 is the reactive current of the unit before the fault, K pv , K p , K p0 , K qv , K q , K q0 is an undetermined parameter, where K pv is the active voltage coefficient, K p is the active current coefficient, K p0is the active current setting value, K qv is the reactive voltage coefficient, K q is the reactive current coefficient, K q0 is the reactive current setting value;

[0119] (2) Set the optimization objective function as follows:

[0120] Set the objective function:

[0121]

[0122] The least squares method is used to solve the optimal parameter value that minimizes ΔIP: K pv―opt , K p―opt , K p0―opt ; Use the least squares method to solve the optimal parameter value that minimizes ΔIQ: K qv―opt , K q―opt , K q0―opt ;

[0123] (3) The obtained optimal parameters are used as the active current model parameters and reactive current model parameters during the fault ride-through period to obtain the adjusted active power model and reactive power model, as follows:

[0124] IP=K pv―opt V 0 +K p―opt I p0 +K p0―opt ; (11)

[0125] IQ = K qv―opt V 0 +K q―opt I q0 +K q0―opt ; (12).

[0126] Step S4, checking the fault ride-through parameters of the set new energy unit.

[0127] The specific steps include:

[0128] (1) Construct a single-machine infinite system of a new energy unit, wherein the single-machine infinite system means that the new energy unit constitutes a node, the infinite power source constitutes a node, and the positive sequence internal reactance of the infinite power source is X + , the negative sequence reactance is X ― , the two nodes of the new energy unit and the infinite power source are connected by a circuit;

[0129] (2) According to the measured data conditions, the initial operating conditions of the new energy unit are set, where the node voltage is equal to Active power is equal to Reactive power is equal to

[0130] (3) According to the voltage drop after the fault under various working conditions in the measured data, the grounding resistance of the new energy unit when the single unit infinite system fails is calculated; the calculation of the grounding resistance is as follows:

[0131] The grounding resistance R of the three-phase short-circuit fault under the i-th working condition 3gi The calculation formula is:

[0132]

[0133] The grounding resistance R of the two-phase short circuit fault under the i-th working condition 2gi The calculation formula is:

[0134]

[0135] (4) According to the measured data working conditions, the corresponding fault type and grounding resistance are set during the fault simulation of the new energy unit, where the grounding resistance is set to the corresponding value calculated according to the above formula. The single-machine infinite system of the new energy unit is simulated to obtain the voltage, active current, and reactive current simulation data under various working conditions and faults, as follows:

[0136] The voltage simulation data is:

[0137] The active current simulation data is:

[0138] The reactive current simulation data is:

[0139] The superscript s indicates that the data is simulated data. represents the voltage simulation data set of the i-th working condition, represents the active current simulation data set of the i-th working condition, represents the reactive current simulation data set of the i-th working condition, represents the jth voltage simulation data of the i-th working condition, represents the jth active current simulation data of the i-th working condition, Represents the jth active current simulation data of the i-th working condition;

[0140] (5) Calculate the error between the simulation data and the measured data under the i-th working condition, as follows:

[0141] The voltage error under the i-th working condition is:

[0142]

[0143] The active current error under the i-th working condition is:

[0144]

[0145] The reactive current error under the i-th working condition is:

[0146]

[0147] If the maximum value of the voltage error in N working conditions max(ΔU i ) is less than a given threshold ΔU max , it means that the setting of the single-machine infinite system of the new energy unit is correct; otherwise, it is necessary to check and reset the simulation conditions and parameters of the single-machine infinite system, and then perform the calibration again;

[0148] If the maximum value of the active current error in N working conditions is max(ΔIP i ) is less than a given threshold ΔIP max , then the active current model of the new energy unit after adjustment is: IP = K pv―opt V 0 +K p―opt I p0 +K p0―opt The settings are correct; otherwise, you need to check and reset the active current model parameters, and then perform the calibration again;

[0149] If the maximum value of the reactive current error in N working conditions is max(ΔIQ i ) is less than a given threshold ΔIQ max , then the active current model of the new energy unit after adjustment is: IQ=K qv―opt V 0 +K q―opt I q0 +K q0―opt The setting is correct; otherwise, you need to check and re-calibrate the reactive current model parameters and then perform the calibration again.

[0150] Step S5: If the calibration fails, it is necessary to check and reset the corresponding parameters and perform calibration again.

[0151] Taking the fault ride-through parameter setting and verification of a wind turbine in a wind farm as an example, there are three-phase short circuit and two-phase short circuit tests. The voltage drop depth of the unit terminal under the two tests should include five cases: 20% U e 、35%U e , 50%U e 、75%U e 、90%U e , where U e It is the rated voltage of the unit terminal.

[0152] 20% U of three-phase short circuit e Take the voltage drop data as an example. The measured data is as follows:

[0153] The measured voltage data is:

[0154] U m ={0.978909,0.978591,0.978976,0.979189,……,0.978323};

[0155] The measured data of active current is:

[0156] IP m ={0.978062,0.977659,0.977396,0.978451,……,0.980409};

[0157] The measured data of reactive current is:

[0158] IQ m ={0.034726,0.033456,0.03417,0.034462,……,0.036516};

[0159] Since there are 5000 data in each data, the data volume is very large, the voltage measured data, active current measured data, reactive current measured data are represented by graphs as follows Figure 2 (a) Figure 2 (b) Figure 2 (c) as shown.

[0160] The preprocessing results of the measured data of fault ride-through of the collected new energy units are shown in Table 1 below.

[0161] Table 1 Calculation results of the average values ​​of voltage, active current and reactive current before and during faults under 10 working conditions

[0162]

[0163] The parameters of the fault ride-through of the new energy unit are adjusted according to the preprocessed data, and the least squares method is used to solve the optimal parameters as shown in Table 2 below.

[0164] Table 2 Optimal tuning parameters

[0165] <![CDATA[K pv―opt ]]> <![CDATA[K p―opt ]]> <![CDATA[K p0―opt ]]> <![CDATA[K qv―opt ]]> <![CDATA[K q―opt ]]> <![CDATA[K q0―opt ]]> 0.320231 4.336842 -3.400992 1.863912 23.537859 -0.684441

[0166] The fault ride-through parameters of the adjusted new energy units are checked, and the calculation results of the grounding resistance under 10 working conditions are shown in Table 3 below.

[0167] Table 3 Calculation results of ground resistance under 10 working conditions

[0168] serial number Corresponding to the measured working conditions R 1 <![CDATA[Three-phase short circuit at 20% U e Drop]]> 0.047988 2 <![CDATA[Three-phase short circuit 35% U e Drop]]> 0.071112 3 <![CDATA[Three-phase short circuit at 50% U e Drop]]> 0.087383 4 <![CDATA[Three-phase short circuit at 75% U e Drop]]> 0.161778 5 <![CDATA[Three-phase short circuit at 90% U e Drop]]> 0.227557 6 <![CDATA[Two-phase short circuit 20% U e Drop]]> 0.059516 7 Two-phase short circuit 35% Ux drop 0.074582 8 <![CDATA[Two-phase short circuit 50% U e Drop]]> 0.091652 9 <![CDATA[Two-phase short circuit at 75% U e Drop]]> 0.150875 10 <![CDATA[Two-phase short circuit 90% U e Drop]]> 0.207487

[0169] According to the corresponding measured working conditions, the corresponding fault type and grounding resistance during fault simulation of the new energy unit are set, where the grounding resistance is set to the corresponding value in the above table.

[0170] 20% U of three-phase short circuit e Take the voltage drop data as an example. Since the amount of simulated data is large, the simulation results of voltage simulation data, active current simulation data, and reactive current simulation data are as follows: Figure 3 (a) Figure 3 (b) Figure 3 (c) as shown.

[0171] 20% U of three-phase short circuit e Take the voltage drop condition as an example. The comparison chart of the measured data and simulated data of voltage, active current and reactive current is shown in the figure below. Figure 4 (a) Figure 4 (b) Figure 4 (c) as shown.

[0172] The calculated errors under 10 working conditions are shown in Table 4 below.

[0173] Table 4 Error calculation results under 10 working conditions

[0174] serial number Voltage Error Active current error Reactive current error 1 0.3％ 0.4％ 8.5％ 2 1.3％ 1.2％ 1.4％ 3 1.0％ 5.4％ 7.2％ 4 0.5％ 8.4％ 1.8％ 5 0.4％ 0.3％ 3.7％ 6 0.4％ 17.1％ 7.4％ 7 1.3％ 12.1％ 12.4％ 8 0.8％ 10.4％ 1.1％ 9 1.2％ 10.1％ 8.9％ 10 0.3％ 0.5％ 0.6％

[0175] According to the above results, the maximum value of the voltage error under 10 working conditions is 1.3%, which is less than the given threshold of 5%, the maximum value of the active current error is 17.1%, which is less than the given threshold of 20%, and the maximum value of the reactive current error is 12.4%, which is less than the given threshold of 20%. Therefore, the set active current model parameters and reactive current model parameters are qualified.

[0176] The method of the present invention has the following advantages:

[0177] 1. Improved the efficiency of setting and verification. The method is simple and practical, and can be programmed to achieve automatic setting and verification. After testing, 10 working conditions (each with 15,000 measured data) can complete automatic setting and verification within 10 minutes, which greatly improves efficiency.

[0178] 2. Reduce the number of parameters to be adjusted. Through experience, key parameters are identified and selected. Only two groups of six parameters need to be adjusted to achieve a good fitting effect. The number of parameter adjustments is reduced.

[0179] 3. Improved calibration accuracy. A simulation model establishment method is proposed, especially a ground resistance calculation formula is given, which can accurately calculate the voltage drop depth of the model and improve the accuracy of parameter calibration. According to the calculation results, the voltage error is always the smallest among the three.

[0180] Embodiment 2:

[0181] Based on the same inventive concept as that of Example 1, this embodiment provides a system for setting and verifying fault ride-through parameters of a new energy unit, which is applied to the method described, and includes:

[0182] Data acquisition module, collecting measured data of fault ride-through of new energy units;

[0183] A data processing module is used to pre-process the collected measured data of fault ride-through of new energy units;

[0184] The setting module is used to set the fault ride-through parameters of the new energy unit according to the pre-processed data;

[0185] The verification module is used to verify the fault ride-through parameters of the set new energy units;

[0186] The setting module is used to check and reset the corresponding parameters and perform the calibration again when the calibration fails.

[0187] Embodiment 3:

[0188] Based on the same inventive concept as Example 1, this embodiment provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the method for setting and verifying the fault ride-through parameters of the new energy unit.

[0189] Embodiment 4:

[0190] Based on the same inventive concept as that of Example 1, this embodiment provides a processor, which is used to run a program, wherein the method for setting and verifying fault ride-through parameters of the new energy unit is executed when the program is running.

[0191] Those of ordinary skill in the art will appreciate that the modules of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition of each example has been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0192] In the embodiments provided by the present invention, it should be understood that the division of modules is only a logical function division, and there may be other division methods in actual implementation, for example, multiple modules can be combined into one module, one module can be split into multiple modules, or some features can be ignored, etc.

[0193] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0194] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-0nlyMemory), random access memory (RAM, RandomAccessMemory), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0195] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for setting and verifying fault ride-through parameters of a new energy unit, characterized in that: The following steps are involved: Collect the measured data of voltage, active current and reactive current during fault ride-through of new energy units; Pre-process the collected measured data of fault ride-through of new energy units; Adjust the fault ride-through parameters of the new energy unit based on the pre-processed data; Verify the fault ride-through parameters of the set new energy units; If the calibration fails, you need to check and reset the corresponding parameters and perform the calibration again.

2. According to claim 1, a method for setting and verifying fault ride-through parameters of a new energy unit is characterized in that: The actual measured data collected for fault ride-through of new energy units are as follows: The measured data of voltage, active power and reactive power under N working conditions are collected and expressed as follows: The measured voltage data is: The measured data of active current is: The measured data of reactive current is: Among them, subscript i represents the i-th working condition, subscript j represents the j-th data, superscript m represents that the data is measured data, and subscript M is the total number of measured data; represents the voltage measured data set of the i-th working condition, represents the measured data set of active current under the i-th working condition, represents the reactive current measured data set of the i-th working condition, represents the jth voltage measured data under the i-th working condition, represents the jth active power measured data under the i-th working condition, Represents the jth reactive power measured data under the i-th working condition.

3. According to claim 2, a method for setting and verifying fault ride-through parameters of a new energy unit is characterized in that: The N operating conditions should at least include the following operating conditions: three-phase short-circuit test conditions and two-phase short-circuit test conditions; The drop depth of the terminal voltage of the unit under the above two working conditions should include at least the following five situations: 20% U e 、35%U e 、50%U e 、75%U e 、90%U e , where U e It is the rated voltage of the unit terminal.

4. According to claim 2, a method for setting and verifying fault ride-through parameters of a new energy unit is characterized in that: The preprocessing of the collected measured data of the fault ride-through of the new energy generator set comprises the following steps: Calculate the average drop depth of the measured voltage data during the fault period based on the measured voltage data The details are as follows: Where A is the starting position of the fault, and L is the number of data during the fault period; Calculate the average value of the voltage measured data before the fault The details are as follows: Calculate the average drop depth of the active current measured data during the fault period based on the active current measured data The details are as follows: Calculate the average value of the active current measured data before the fault The details are as follows: Calculate the average drop depth of reactive current measured data during the fault period based on reactive current measured data The details are as follows: Calculate the average value of the active current measured data before the fault The details are as follows:

5. According to claim 2, a method for setting and verifying fault ride-through parameters of a new energy unit is characterized in that: The setting of the parameters of the fault ride-through of the new energy unit according to the preprocessed data specifically includes the following steps: (1) Set the active current model and reactive current model during fault ride-through, as follows: The active current model during fault ride-through is set as: IP=K pv V0+K p I p0 +K p0 ; (7) The reactive current model during fault ride-through is set as: IQ=K qv V0+K q I q0 +K q0 (8) Where V0 is the voltage amplitude of the new energy unit before the fault, I p0 is the active current of the unit before the fault, I q0 is the reactive current of the unit before the fault, K pv , K p , K p0 , K qv , K q , K q0 is an undetermined parameter, where K pv is the active voltage coefficient, K p is the active current coefficient, K p0 is the active current setting value, K qv is the reactive voltage coefficient, K q is the reactive current coefficient, K q0 is the reactive current setting value; (2) Set the optimization objective function as follows: Set the objective function: The least squares method is used to solve the optimal parameter value that minimizes ΔIP: K pv―opt , K p―opt , K p0―opt ; The least squares method is used to solve the optimal parameter value that minimizes ΔIQ: K qv―opt , K q―opt , K q0―opt ; (3) The obtained optimal parameters are used as the active current model parameters and reactive current model parameters during the fault ride-through period to obtain the adjusted active power model and reactive power model, as follows: IP=K pv―opt V0+K p―opt I p0 +K p0―opt ; (11) IQ=K qv―opt V0+K q―opt I q0 +K q0―opt (12)。 6. A method for setting and verifying fault ride-through parameters of a new energy unit according to claim 5, characterized in that: The verification of the fault ride-through parameters of the set new energy generator unit specifically includes the following steps: (1) Construct a single-machine infinite system of a new energy unit, wherein the single-machine infinite system means that the new energy unit constitutes a node, the infinite power source constitutes a node, and the positive sequence internal reactance of the infinite power source is X + , the negative sequence reactance is X ― , the two nodes of the new energy unit and the infinite power source are connected by a circuit; (2) According to the measured data conditions, the initial operating conditions of the new energy unit are set, where the node voltage is equal to Active power is equal to Reactive power is equal to (3) Based on the voltage drop after the fault under various working conditions in the measured data, the grounding resistance of the new energy unit when the single unit infinite system fails is calculated; (4) Set the fault type and grounding resistance corresponding to the fault simulation of the new energy unit, perform fault simulation on the single-machine infinite system of the new energy unit, and obtain the voltage, active current, and reactive current simulation data under various working conditions and faults, as follows: The voltage simulation data is: The active current simulation data is: The reactive current simulation data is: The superscript s indicates that the data is simulated data. represents the voltage simulation data set of the i-th working condition, represents the active current simulation data set of the i-th working condition, represents the reactive current simulation data set of the i-th working condition, represents the jth voltage simulation data of the i-th working condition, represents the jth active current simulation data of the i-th working condition, Represents the jth active current simulation data of the i-th working condition; (5) Calculate the error between the simulation data and the measured data under the i-th working condition, as follows: The voltage error under the i-th working condition is: The active current error under the i-th working condition is: The reactive current error under the i-th working condition is: If the maximum value of the voltage error in N working conditions max(ΔU i ) is less than a given threshold ΔU max , it means that the setting of the single-machine infinite system of the new energy unit is correct; otherwise, it is necessary to check and reset the simulation conditions and parameters of the single-machine infinite system, and then perform the calibration again; If the maximum value of the active current error in N working conditions is max(ΔIP i ) is less than a given threshold ΔIP max , then the active current model of the new energy unit after adjustment is: IP = K pv―opt V0+K p―opt I p0 +K p0―opt The settings are correct; otherwise, you need to check and reset the active current model parameters, and then perform the calibration again; If the maximum value of the reactive current error in N working conditions is max(ΔIQ i ) is less than a given threshold ΔIQ max , then the active current model of the new energy unit after adjustment is: IQ=K qv―opt V0+K q―opt I q0 +K q0―opt The setting is correct; otherwise, you need to check and re-calibrate the reactive current model parameters and then perform the calibration again.

7. A method for setting and verifying fault ride-through parameters of a new energy unit according to claim 6, characterized in that: The calculation of the grounding resistance is as follows: The grounding resistance R of the three-phase short-circuit fault under the i-th working condition 3gi The calculation formula is: The grounding resistance R of the two-phase short circuit fault under the i-th working condition 2gi The calculation formula is:

8. A setting and verification system for fault ride-through parameters of new energy units, characterized in that: The method applied to any one of claims 1 to 6 comprises: Data acquisition module, collecting measured data of fault ride-through of new energy units; A data processing module is used to pre-process the collected measured data of fault ride-through of new energy units; The setting module is used to set the fault ride-through parameters of the new energy unit according to the pre-processed data; The verification module is used to verify the fault ride-through parameters of the set new energy generator set; The setting module is used to check and reset the corresponding parameters and perform the calibration again when the calibration fails.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the method for setting and verifying the fault ride-through parameters of the new energy unit as described in any one of claims 1 to 7.

10. A processor, characterized in that: The processor is used to run a program, wherein the program, when running, executes the method for setting and verifying fault ride-through parameters of a new energy generator set as described in any one of claims 1 to 7.

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