A new energy converter controller voltage fault ride-through control parameter automatic identification method

Abstract

A new energy converter controller voltage fault ride-through control parameter automatic identification method, the steps are as follows: step (1), import the recording file; step (2), extract the data in the recording file, and process the data according to the calculation formula; step (3), export the control parameter identification result. The new energy converter controller voltage fault ride-through control parameter automatic identification method can call recording data, and automatically carry out calculation and checking of control parameters and intermediate variables one by one, with low error rate and high calculation efficiency, greatly improving the work efficiency of the test link.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy converter, and particularly relates to a new energy converter controller voltage fault ride-through control parameter automatic identification method. BACKGROUND

[0002] The large power change caused by the off-grid of the new energy station or energy storage power station will threaten the safe and stable operation of the power grid, and the safe and stable calculation and analysis of the power system is an important means to ensure the safe and stable operation of the power system. The "GB 38755-2019 Power System Safety and Stability Guide" clearly stipulates that "the detailed models and parameters of various components, devices and loads in power system calculation should be researched, measured and established", and "the new energy station should adopt detailed electromechanical transient or electromagnetic transient model", so it is necessary and important to accurately identify the parameters of the converter controller of the new energy unit for the safe and stable calculation and analysis of the power system.

[0003] The new energy converter control parameter identification refers to simulating the high voltage and low voltage fault of the power grid based on the true type test platform or the controller hardware-in-the-loop simulation test platform, and identifying the key control parameters of the new energy converter controller according to the external characteristics of the high voltage ride-through and low voltage ride-through curve of the new energy converter, and finally verifying whether the parameters meet the technical requirements of the power grid dispatching department.

[0004] At the present stage, in the process of identifying the control parameters of the photovoltaic inverter based on the controller hardware-in-the-loop simulation platform, there is a lack of automatic control parameter identification tool, and the detection personnel still need to carry out the calculation and checking of the key control parameters and intermediate variables item by item, and the calculation steps are complicated and inefficient. When the control algorithm of the measured sample device is not perfect, the test project will be repeatedly verified due to the adjustment of the control parameters, and then the control parameter identification link will be repeatedly calculated. In summary, the existing technology lacks an automatic control parameter identification tool, and the detection personnel still need to carry out the calculation and checking of the key control parameters and intermediate variables item by item, and the calculation steps are complicated and inefficient.

[0005] Therefore, in view of the deficiencies of the prior art, it is very necessary to provide a new energy converter controller voltage fault ride-through control parameter automatic identification method to solve the deficiencies of the prior art. SUMMARY

[0006] The purpose of the present application is to provide a new energy converter controller voltage fault ride-through control parameter automatic identification method to avoid the deficiencies of the prior art. The new energy converter controller voltage fault ride-through control parameter automatic identification method can solve the problems of low work efficiency and high error rate of the test personnel in the control parameter identification work.

[0007] The above-mentioned purpose of the present application is realized by the following technical measures:

[0008] The application provides a new energy converter controller voltage fault ride-through control parameter automatic identification method, and steps are as follows:

[0009] Step (1), import the recording file;

[0010] Step (2), extract data in the recording file, and perform data processing according to a calculation formula;

[0011] Step (3), export the control parameter identification result.

[0012] Preferably, the recording file is a low-voltage ride-through recording file or a high-voltage ride-through recording file.

[0013] Preferably, the control parameter is a low-voltage ride-through control parameter or a high-voltage ride-through control parameter, wherein the low-voltage ride-through control parameter is a reactive low-ride current coefficient, an active low-ride current coefficient and an active low-ride recovery rate; and the high-voltage ride-through control parameter is a reactive high-ride current coefficient and an active high-ride power coefficient.

[0014] Preferably, step (2) comprises:

[0015] Step (2.1), initialization configuration of the recording file and recording data calling;

[0016] Step (2.2), basic data calculation;

[0017] Step (2.3), voltage ride-through control parameter calculation.

[0018] Preferably, step (3) is specifically exporting the voltage ride-through control parameter identification result and checking result in the form of an excel text, and exporting the fundamental positive sequence variable calculation result and X-axis and Y-axis calculation results in the form of a drawing.

[0019] Preferably, step (2.1) is specifically configured with a recording file storage path, a power rating, a voltage rating, a low-voltage ride-through threshold, a high-voltage ride-through threshold, a reactive high-ride current coefficient setting value, a reactive low-ride current coefficient setting value, an active high-ride current coefficient setting value, an active low-ride current coefficient setting value, an active low-ride recovery rate setting value and reading of specified recording file content.

[0020] Preferably, step (2.2) is specifically configured with calling of new energy unit terminal three-phase voltage ua, ub and uc, three-phase current ia, ib and ic, and calculation of fundamental positive sequence voltage U 1+ , fundamental positive sequence current I 1+ , fundamental positive sequence active power P 1+ , fundamental positive sequence reactive power Q 1+ , fundamental positive sequence active current I p1+, fundamental positive sequence reactive current I q1+ ; and according to the change of the fundamental positive sequence voltage amplitude, the recording file is identified as a high voltage ride through fault or a low voltage ride through fault, and the feature character in the recording file name is checked to determine whether the recording file is correct.

[0021] Preferably, the step (2.3) is specifically that, when the recording file is a low voltage ride through recording file, the low voltage ride through control parameter is used for calculation according to the step (2.3.1); and when the recording file is a high voltage ride through recording file, the high voltage ride through control parameter is used for calculation according to the step (2.3.2).

[0022] Preferably, the step (2.3.1) is specifically that, the reactive current curve and the X-axis variable value and the Y-axis variable value in the positive sequence voltage curve are used to calculate the reactive low ride current coefficient K2 Iq_LV , the active low ride current coefficient K4 Ip_LV and the active low ride recovery rate dIp RECOVER_LV .

[0023] Preferably, the X-axis variable value is t r0_LV , t r3_LV , t r1_LV , t r2_LV , t r4_LV , t res_LV , t last_LV and t quit_LV .

[0024] Wherein, t r0_LV is the time when the terminal voltage drops to 0.9pu, t r3_LV is the time when the terminal voltage recovers to 0.9pu during the voltage drop, t r1_LV is the time when the reactive current of the unit output is greater than I Q during the low ride, t r2_LV is the time when the reactive current of the unit output is less than I Q during the low ride, t r4_LV is the time when the reactive current of the unit output is less than or equal to I quit_LV after the low ride recovery, t res_LV is the low ride reactive current injection response time, t last_LV is the low ride reactive current injection duration, and t quit_LV is the low ride reactive current exit time.

[0025] Preferably, the Y-axis variable value is I quit_LV and I Q .

[0026] Wherein, I Q is I q1+_avg0 and 0.9ΔI q1+_ref_LVI quit_LV I is a low-pass reactive current exit reference value q1+_avg0 I is a low-pass pre-fault steady-state interval reactive current average value q1+_ref_LV I is a low-pass post-fault steady-state interval reactive current average value.

[0027] Preferably, the step (2.3.2) is specifically calculating the reactive high-pass current coefficient K1 Iq_HV and the active high-pass current coefficient K3 Pp_HV .

[0028] Preferably, the characteristic character is low-pass or high-pass.

[0029] Preferably, the reactive current curve is extracted from machine terminal three-phase current recording data.

[0030] Preferably, the positive sequence voltage curve is extracted from machine terminal three-phase voltage recording data.

[0031] The new energy converter controller voltage fault ride-through control parameter automatic identification method of the application has the steps as follows: step (1), importing a recording file; step (2), extracting data in the recording file and processing the data according to a calculation formula; and step (3), exporting the control parameter identification result. The new energy converter controller voltage fault ride-through control parameter automatic identification method can call recording data and automatically carry out calculation and checking of control parameters and intermediate variables one by one, has low error rate and high calculation efficiency, and greatly improves the work efficiency of the test link. BRIEF DESCRIPTION OF DRAWINGS

[0032] The application is further described by using the drawings, but the content in the drawings does not constitute any limitation on the application.

[0033] Figure 1 It is a flow chart of the new energy converter controller voltage fault ride-through control parameter automatic identification method.

[0034] Figure 2 It is a detailed flow chart of the new energy converter controller voltage fault ride-through control parameter automatic identification method.

[0035] Figure 3 It is a low voltage ride-through parameter identification result chart of example 2. DETAILED DESCRIPTION

[0036] The technical solutions of the application are further described by combining the following examples. The application partly involves the following terms:

[0037] New energy converter is one of the key equipment of new energy power generation system, which completes the electrical equipment whose voltage, frequency, phase number and other electrical quantity or characteristics change, mainly including photovoltaic inverter, wind power converter, energy storage converter, etc.

[0038] Voltage fault ride-through is that when the voltage at the grid-connected point of the new energy converter exceeds the normal operating range due to power system accidents or disturbances, the new energy converter can ensure continuous operation without being disconnected within the specified change range and time interval. Voltage fault ride-through mainly includes low voltage ride-through and high voltage ride-through.

[0039] Voltage ride-through control parameters are electrical control parameters that are strongly related to the dynamic and transient response of the new energy converter during power grid fault disturbance, mainly including reactive high-ride current coefficient, reactive low-ride current coefficient, active high-ride power coefficient, active low-ride current coefficient, and active low-ride recovery rate.

[0040] The grid-connected point is the connection point of the new energy converter and the power grid.

[0041] New energy converter control parameter automatic identification is based on a semi-physical simulation test platform to simulate high voltage and low voltage faults in the power grid, and record the voltage and current at the terminal of the new energy unit. Based on the developed control parameter automatic identification algorithm, the recorded wave data is analyzed to extract the key control parameters of the new energy converter controller, and to verify whether the parameters meet the technical requirements of the power grid dispatching department.

[0042] Embodiment 1

[0043] A new energy converter controller voltage fault ride-through control parameter automatic identification method, as Figure 1 and 2 , the steps are as follows:

[0044] Step (1), import the recorded wave file;

[0045] Step (2), extract the data in the recorded wave file and process the data according to the calculation formula;

[0046] Step (3), export the control parameter identification result.

[0047] Wherein, the recorded wave file is a low voltage ride-through recorded wave file or a high voltage ride-through recorded wave file.

[0048] The control parameters of the present application are low voltage ride-through control parameters or high voltage ride-through control parameters, wherein the low voltage ride-through control parameters are reactive low-ride current coefficient, active low-ride current coefficient and active low-ride recovery rate; the high voltage ride-through control parameters are reactive high-ride current coefficient and active high-ride power coefficient.

[0049] Specifically, step (3) involves exporting the voltage ride-through control parameter identification and verification results in Excel text format; and exporting the fundamental positive sequence variable calculation results and X-axis and Y-axis calculation results in plot format.

[0050] Step (2) of the present invention specifically includes:

[0051] Step (2.1): Initialization configuration of the waveform recording file and retrieval of waveform recording data;

[0052] Step (2.2), basic data calculation;

[0053] Step (2.3): Calculation of voltage ride-through control parameters.

[0054] Step (2.1) specifically involves configuring the waveform recording file storage path, power rating, voltage rating, low voltage ride-through threshold, high voltage ride-through threshold, reactive high ride-through current coefficient setting, reactive low ride-through current coefficient setting, active high ride-through current coefficient setting, active low ride-through current coefficient setting, active low ride-through recovery rate setting, and reading the specified waveform recording file content.

[0055] Specifically, step (2.2) involves calling the three-phase voltages ua, ub, and uc, and the three-phase currents ia, ib, and ic of the new energy generator unit, and calculating the fundamental positive sequence voltage U based on Fourier analysis and the symmetrical component method. 1+ Fundamental positive sequence current I 1+ Fundamental positive sequence active power P 1+ Fundamental positive sequence reactive power Q 1+ Fundamental positive sequence active current I p1+ Fundamental positive sequence reactive current I q1+ Based on the change in the amplitude of the fundamental positive sequence voltage, the waveform file is identified as either a high-voltage ride-through fault or a low-voltage ride-through fault. The waveform file is then checked against the characteristic characters in the waveform file name to determine whether the waveform file is correct. The characteristic characters are either low-voltage ride-through or high-voltage ride-through.

[0056] It should be noted that, in this invention, determining the correctness of the waveform recording file refers to manually storing and configuring the waveform recording file name during the testing phase. Keywords in the waveform recording file name (such as high-voltage ride-through and low-voltage ride-through) are compared with the data characteristics of the waveform recording file (whether the fundamental positive-sequence voltage enters a high-voltage ride-through state). If they match, the waveform recording file is considered correct. In this invention, a high-voltage ride-through fault is defined as a sudden increase in the fundamental positive-sequence voltage amplitude above 1.1 pu and maintaining that value; a low-voltage ride-through fault is defined as a sudden drop in the fundamental positive-sequence voltage amplitude below 0.8 pu and maintaining that value.

[0057] The Fourier analysis and symmetric component method in this invention are relatively mature algorithms in power systems, which should be known to those skilled in the art, and will not be described in detail here.

[0058] Wherein, the step (2.3) is specifically, when the recording file is a low voltage ride through recording file, the low voltage ride through control parameter is used for calculation according to step (2.3.1); when the recording file is a high voltage ride through recording file, the high voltage ride through control parameter is used for calculation according to step (2.3.2).

[0059] Further, the step (2.3.1) is specifically, reactive current curve and X-axis variable value and Y-axis variable value in positive sequence voltage curve are used for calculating reactive low-pass current coefficient K2 Iq_LV , active low-pass current coefficient K4 Ip_LV and active low-pass recovery rate dIp RECOVER_LV .

[0060] X-axis variable value is t r0_LV , t r3_LV , t r1_LV , t r2_LV , t r4_LV , t res_LV , t last_LV and t quit_LV .

[0061] t r0_LV is the time when the terminal voltage drops to 0.9pu, t r3_LV is the time when the voltage drops during the recovery to 0.9p.u, t r1_LV is the time when the unit output reactive current during low-pass is > I Q , t r2_LV is the time when the unit output reactive current during low-pass is < I Q , t r4_LV is the time when the unit output reactive current after low-pass recovery is ≤ I quit_LV , t res_LV is low-pass reactive current injection response time, t last_LV is low-pass reactive current injection duration, t quit_LV is low-pass reactive current exit time.

[0062] And Y-axis variable value is I quit_LV and I Q .

[0063] Wherein, I Q is the sum of I q1+_avg0 and 0.9ΔI q1+_ref_LV , I quit_LV is low-pass reactive current exit reference value; I q1+_avg0 is the average value of reactive current in steady state interval before low-pass fault, ΔI q1+_ref_LV is the average value of reactive current in steady state interval during low-pass fault.

[0064] Wherein, step (2.3.2) is specifically to calculate the reactive high penetration current coefficient K1 according to the X-axis variable value and the Y-axis variable value in the reactive current curve and the positive sequence voltage curve Iq_HV And the active high penetration current coefficient K3 Pp_HV .

[0065] Wherein, the reactive current curve is extracted from the machine terminal three-phase current recording data; and the positive sequence voltage curve is extracted from the machine terminal three-phase voltage recording data.

[0066] The new energy converter controller voltage fault ride-through control parameter automatic identification method can call recording data and automatically calculate and check control parameters and intermediate variables one by one, with low error rate and high calculation efficiency, greatly improving the work efficiency of the test link.

[0067] Embodiment 2.

[0068] A new energy converter controller voltage fault ride-through control parameter automatic identification method, other steps are the same as embodiment 1, in step 2.2, taking the reactive low penetration current coefficient in the low voltage ride-through control parameter calculation as an example, wherein the definition of the low voltage ride-through control parameter is shown in Table 1.

[0069] Table 1, low voltage ride-through control parameter

[0070]

[0071]

[0072] Wherein, the new energy unit reactive current injection determination method, the fundamental wave positive sequence reactive current curve of the new energy unit output is extracted from the machine terminal three-phase current recording data; and the fundamental wave positive sequence amplitude curve of the machine terminal voltage of the new energy unit is extracted from the machine terminal three-phase voltage recording data. It should be noted that the X-axis is the time axis, and each symbol represents a specific time. According to the "machine terminal three-phase voltage recording data", the "fundamental wave positive sequence voltage amplitude curve" can be extracted; according to the "machine terminal three-phase current recording data", the "fundamental wave positive sequence current amplitude curve" can be extracted; on the basis of the "fundamental wave positive sequence voltage and current amplitude curve", according to the symbol interpretation, the time of each point is determined.

[0073] Wherein, the X-axis symbol and interpretation are shown in Table 2:

[0074] Table 2, X-axis symbol and interpretation

[0075]

[0076] Wherein Figure 3 The Y-axis symbol and interpretation in Table 3 are shown in Table 3:

[0077] Table 3, Y-axis symbols and explanations

[0078] Symbol Name and explanation U 1+ (t)] Instantaneous value of terminal fundamental positive sequence voltage I q1+ (t)] Instantaneous value of terminal fundamental positive sequence reactive current U LV ]]> Low penetration voltage threshold, default value 0.9 p.u. U dip ]]> Low penetration voltage threshold, default value 0.9 p.u. I q1+_avg0 ]] Low penetration voltage threshold, default value 0.9 p.u. Delta I q1+_ref_LV ]] Low penetration voltage threshold, default value 0.9 p.u. I Q ]] Low penetration voltage threshold, default value 0.9 p.u. I q1+_avg_LV ]] Low penetration voltage threshold, default value 0.9 p.u. Delta I q1+_LV ]] Low penetration voltage threshold, default value 0.9 p.u. I quit_LV ]] Low penetration voltage threshold, default value 0.9 p.u. I N ]] Low penetration voltage threshold, default value 0.9 p.u.

[0079] Step 2.3.1.1, according to the intersection of the fundamental positive sequence voltage (U 1+ ) and the low-pass voltage threshold (U LV ), calculate t r0_LV , t r3_LV .

[0080] Step 2.3.1.2, according to the formula (C1.1.1) to formula (C1.1.3) to calculate I Q , and calculate the specific can according to Low penetration voltage threshold, default value 0.9 p.u. The intersection of I Q and I q1+ (t) at the intersection point, that is: t r1_LV , t r2_LV .

[0081] Formula (C1.1.1):

[0082] Formula (C1.1.2): ΔI q1+_ref_LV = K2 Iq_LV_set × (U LV -U 1+ ) × I N ;

[0083] Formula (C1.1.3): I Q = I q1+_avg0 + 0.9 × ΔI q1+_ref_LV ;

[0084] Step 2.3.1.3, according to formula C1.1.4 to calculate the reactive current exit reference value (I quit_LV ), according to Low penetration voltage threshold, default value 0.9 p.u. According to the intersection of I quit_LV and I q1+ (t), and then calculate t r4_LV .

[0085] Formula (C1.1.4): I quit_LV = I q1+_avg0 + max (0.05I N , 0.1 ΔI q1+_LV );

[0086] Step 2.3.1.4, according to formula (C1.1.5) to formula (C1.1.7) to calculate the low-pass reactive current injection response time (t res_LV ), the low-pass reactive current injection duration (t last_LV ), the low-pass reactive current exit time (t quit_LV).

[0087] Equation (C1.1.5): t res_LV = t r1_LV -t r0_LV ;

[0088] Equation (C1.1.6): t last_LV = t r2_LV -t r1_LV ;

[0089] Equation (C1.1.7): t quit_LV = t r4_LV -t r3_LV ;

[0090] Step 2.3.1.5, calculate the reactive low penetration current coefficient K2 according to Equations (C1.1.8) to (C1.1.10) Iq_LV .

[0091] Equation (C1.1.8):

[0092] Equation (C1.1.9): ΔI q1+_LV = I q1+_LV -I q1+_avg0 ;

[0093] Equation (C1.1.10): K2 Iq_LV = ΔI q1+_LV / [(U LV –U 1+ )×I N ](0.2p.u.≤U 1+ ≤0.9p.u.).

[0094] Step (3) is that the initial output active power of the new energy generator set is 0.3pu, the initial reactive power is negative 0.02pu, the terminal voltage is 1.0pu, the low voltage fault of the new energy generator set terminal is simulated, the fault type is asymmetric drop, and the fault duration is 1214ms. The drawing derived by the control parameter automatic identification algorithm is as follows Low penetration voltage threshold, default value 0.9 p.u. , wherein Low penetration voltage threshold, default value 0.9 p.u. (a) is the terminal fundamental positive sequence voltage amplitude, t r0_LV and t r3_LV ; Low penetration voltage threshold, default value 0.9 p.u. (b) is the terminal fundamental positive sequence reactive current, t r1_LV , t r2_LV and t r4_LV , I Q , I quit_LV ; Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, default value 0.9 p.u. Low penetration voltage threshold, (c) is the terminal fundamental positive sequence active current amplitude, t a_LV and t b_LV; wherein the low voltage ride through control parameter identification results are shown in Table 4.

[0095] Table 4, low voltage ride through key control parameter identification results

[0096]

[0097]

[0098] The new energy converter controller voltage fault ride through control parameter automatic identification method of the embodiment can call the recording wave data, and automatically check the reactive low ride current coefficient calculation in the low voltage ride through control parameter calculation, has low error rate and high calculation efficiency, and greatly improves the work efficiency of the test link.

[0099] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A method for automatic identification of voltage fault ride-through control parameters of a new energy converter controller, characterized in that, The steps are as follows: Step (1), importing a recording file; Step (2), extracting data in the recording file and processing the data according to a calculation formula; Step (3), exporting a control parameter identification result; The recording file is a low-voltage ride-through recording file or a high-voltage ride-through recording file; The control parameter is a low-voltage ride-through control parameter or a high-voltage ride-through control parameter, wherein the low-voltage ride-through control parameter is a reactive low-ride current coefficient, an active low-ride current coefficient, and an active low-ride recovery rate; and the high-voltage ride-through control parameter is a reactive high-ride current coefficient and an active high-ride power coefficient; The step (2) comprises: Step (2.1), initialization configuration of the recording file and calling of recording data; Step (2.2), basic data calculation; Step (2.3), voltage ride-through control parameter calculation; The step (2.3) is specifically as follows: when the recording file is a low-voltage ride-through recording file, the low-voltage ride-through control parameter is used for calculation according to step (2.3.1); and when the recording file is a high-voltage ride-through recording file, the high-voltage ride-through control parameter is used for calculation according to step (2.3.2). The step (2.3.1) is specifically calculating the reactive low-pass current coefficient K2 according to the X-axis variable value and the Y-axis variable value in the reactive current curve and the positive sequence voltage curve Iq_LV , the active low-pass current coefficient K4 Ip_LV , and the active low-pass recovery rate dIp RECOVER_LV ; The X-axis variable value is t r0_LV , t r3_LV , t r1_LV , t r2_LV , t r4_LV , t res_LV , t last_LV and t quit_LV ; t r0_LV When the terminal voltage drops to 0.9 pu, t r3_LV When the terminal voltage recovers to 0.9 pu during the voltage drop, t r1_LV During the low-voltage period, the unit's output reactive current is continuously > I. Q At that moment, t r2_LV During the low-voltage period, the unit's output reactive current is continuously < I Q At that moment, t r4_LV For the unit's output reactive current to remain ≤I after low-voltage recovery quit_LV At time t res_LV For the low-through reactive current injection response time, t last_LV The duration of low-through reactive current injection, t quit_LV This refers to the time for the low-voltage reactive current to exit. The Y-axis variable value is I quit_LV and I Q ; where I Q is I q1+_avg0 and 0.9ΔI q1+_ref_LV , I quit_LV is the low penetration reactive current exit reference value; I q1+_avg0 is the low penetration pre-fault steady state interval reactive current average, ΔI q1+_ref_LV is the low penetration post-fault steady state interval reactive current average.

2. The method of claim 1, wherein the method is characterized by: The step (3) is specifically as follows: the voltage ride-through control parameter identification result and a checking result are exported in an excel text form; and the fundamental wave positive sequence variable calculation result and X-axis and Y-axis calculation results are exported in a drawing form.

3. The method of claim 2, wherein the method further comprises: The step (2.1) is specifically as follows: a recording file storage path, a power rating, a voltage rating, a low-voltage ride-through threshold, a high-voltage ride-through threshold, a reactive high-ride current coefficient set value, a reactive low-ride current coefficient set value, an active high-ride current coefficient set value, an active low-ride current coefficient set value, an active low-ride recovery rate set value, and reading of specified recording file content are configured.

4. The method of claim 3, wherein the method further comprises: The step (2.2) specifically comprises calling the three-phase voltage ua, ub, uc and three-phase current ia, ib, ic of the new energy unit terminal, and calculating the fundamental positive sequence voltage U 1+ , fundamental positive sequence current value I 1+ , fundamental positive sequence active power P 1+ , fundamental positive sequence reactive power Q 1+ , fundamental positive sequence active current I p1+ , fundamental positive sequence reactive current I q1+ according to Fourier analysis and symmetrical component method, and identifying the recording wave file as high voltage ride through fault or low voltage ride through fault according to the variation of the fundamental positive sequence voltage amplitude, and checking the characteristic character in the recording wave name to determine whether the recording wave file is correct.

5. The method of claim 4, wherein the method further comprises: The step (2.3.2) is specifically calculating the reactive high-penetration current coefficient K1 according to the X-axis variable value and the Y-axis variable value in the reactive current curve and the positive sequence voltage curve Iq_HV and the active high-penetration current coefficient K3 Pp_HV .

6. The method of claim 5, wherein the method further comprises: The characteristic character is low ride or high ride; The reactive current curve is extracted according to machine-end three-phase current recording data; The positive sequence voltage curve is extracted according to machine-end three-phase voltage recording data.

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