CN116047222A - Automatic identification method for voltage fault ride-through control parameters of new energy converter controller - Google Patents
Automatic identification method for voltage fault ride-through control parameters of new energy converter controller Download PDFInfo
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Abstract
A new energy converter controller voltage fault ride through control parameter automatic identification method comprises the following steps: step (1), importing a wave recording file; step (2), extracting data in the wave recording file, and carrying out data processing according to a calculation formula; and (3) deriving a control parameter identification result. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller can be used for calling wave recording data, automatically carrying out calculation and check of the control parameters and intermediate variables item by item, is low in error rate and high in calculation efficiency, and greatly improves the working efficiency of a test link.
Description
Technical Field
The invention relates to the technical field of new energy converters, in particular to an automatic identification method for voltage fault ride-through control parameters of a new energy converter controller.
Background
The new energy station or the energy storage power station can threaten the safe and stable operation of the power grid due to large power change caused by off-grid, and the safe and stable calculation and analysis of the power system are important means for ensuring the safe and stable operation of the power system. The safety and stability guide rule of the electric power system of GB 38755-2019 clearly stipulates that: the method is characterized in that detailed models and parameters of various elements, devices and loads in power system calculation are researched, actually measured and established, and a detailed electromechanical transient or electromagnetic transient model is adopted by a new energy station, so that accurate identification of parameters of a converter controller of a new energy unit is also important to power system safety and stability calculation analysis.
The new energy converter control parameter identification refers to simulating high-voltage and low-voltage faults of a power grid based on a real test platform or a controller hardware-in-loop simulation test platform, and identifying key control parameters of a new energy converter controller according to the external characteristics of high-voltage ride-through and low-voltage ride-through curves of the new energy converter, and finally verifying whether the parameters meet the technical requirements of a power grid dispatching department.
At present, in the process of carrying out photovoltaic inverter control parameter identification on the basis of controller hardware in a loop simulation platform, an automatic control parameter identification tool is lacked, and detection personnel are still required to carry out calculation and check of key control parameters and intermediate variables item by item, and the calculation steps are complex and the efficiency is low. When the control algorithm of the tested sample device is imperfect, the phenomenon that the test item is repeatedly verified due to the adjustment of the control parameter, and further the control parameter identification link is repeatedly calculated is faced. In summary, the prior art lacks an automatic control parameter identification tool, and still needs detection personnel to perform calculation and check of key control parameters and intermediate variables item by item, and has complicated calculation steps and low efficiency.
Therefore, in order to solve the deficiencies of the prior art, it is necessary to provide an automatic identification method for voltage fault ride-through control parameters of a new energy converter controller.
Disclosure of Invention
The invention aims to avoid the defects of the prior art and provide an automatic identification method for voltage fault ride-through control parameters of a new energy converter controller. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller can solve the problems that the work efficiency of carrying out control parameter identification by testers is low and the error rate is high.
The above object of the present invention is achieved by the following technical measures:
the method for automatically identifying the voltage fault ride-through control parameters of the new energy converter controller comprises the following steps:
step (1), importing a wave recording file;
step (2), extracting data in the wave recording file, and carrying out data processing according to a calculation formula;
and (3) deriving a control parameter identification result.
Preferably, the wave recording file is a low voltage ride through wave recording file or a high voltage ride through wave recording file.
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-pass current coefficient, an active low-pass current coefficient and an active low-pass recovery rate; the high voltage ride through control parameter is reactive high-pass current coefficient and active high-pass power coefficient.
Preferably, the step (2) includes:
step (2.1), initializing configuration of a wave recording file and calling wave recording data;
step (2.2), basic data calculation;
and (2.3) calculating voltage crossing control parameters.
Preferably, the step (3) is specifically to derive the voltage ride through control parameter identification result and the checking result in an excel text form; and (5) deriving a fundamental wave positive sequence variable calculation result and X-axis and Y-axis calculation results in a drawing form.
Preferably, the step (2.1) specifically includes configuring a recording file storage path, a power rated value, a voltage rated value, a low voltage crossing threshold, a high voltage crossing threshold, a reactive high-pass current coefficient set value, a reactive low-pass current coefficient set value, an active high-pass current coefficient set value, an active low-pass recovery rate set value, and reading specified recording file contents.
Preferably, the step (2.2) specifically includes calling the three-phase voltages ua, ub, uc and the three-phase currents ia, ib, ic at the machine side of the new energy unit, and calculating the fundamental wave positive sequence voltage U according to Fourier analysis and a symmetrical component method 1+ Fundamental wave positive sequence current I 1+ Fundamental wave positive sequence active power P 1+ Fundamental wave positive sequence reactive power Q 1+ Fundamental wave positive sequence active current I p1+ Fundamental wave positive sequence reactive current I q1+ The method comprises the steps of carrying out a first treatment on the surface of the Identifying the recorded wave file as a high voltage ride through fault or a low voltage ride through fault according to the positive sequence voltage amplitude variation condition of the fundamental wave, and recording the wave file with the recorded wave nameChecking the characteristic characters and judging whether the recording file is correct or not.
Preferably, in the step (2.3), when the wave recording file is a low voltage ride through wave recording file, calculating by adopting a low voltage ride through control parameter according to the step (2.3.1); and (3) when the wave recording file is a high-voltage ride through wave recording file, calculating by adopting high-voltage ride through control parameters according to the step (2.3.2).
Preferably, the step (2.3.1) specifically calculates the reactive low-penetration current coefficient K2 according to the variable values of the X-axis and the variable values of the Y-axis in the reactive current curve and the positive sequence voltage curve respectively Iq_LV Active low pass current coefficient K4 Ip_LV And an active low pass recovery rate dIp RECOVER_LV 。
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 。
Wherein t is r0_LV For the moment when the voltage of the machine terminal drops to 0.9pu, t r3_LV For recovering the voltage at the machine end to 0.9p.u moment, t during voltage drop r1_LV Output reactive current continuously > I for low-pass period unit Q Time t of (2) r2_LV Output reactive current of unit for low-pass period continuously less than I Q Time t of (2) r4_LV The output reactive current of the unit after low-pass recovery is continuously less than or equal to I quit_LV Time t res_LV For low pass reactive current injection response time, t last_LV For low through reactive current injection duration, t quit_LV For low through reactive current exit time.
Preferably, the Y-axis variable value is I quit_LV And I Q 。
Wherein I is Q Is I q1+_avg0 And 0.9 DeltaI q1+_ref_LV Sum, I quit_LV Withdrawing the reference value for the low-pass reactive current; i q1+_avg0 Is the reactive current average value delta I of the steady-state interval before low-pass fault q1+_ref_LV And the reactive current average value is the steady-state interval reactive current average value of the low-pass fault.
Preferably, step (2.3) aboveAnd 2) respectively calculating reactive high-penetration current coefficient K1 according to the variable values of the X axis and the Y axis in the reactive current curve and the positive sequence voltage curve Iq_HV And an active high through current coefficient K3 Pp_HV 。
Preferably, the character is low-pass or high-pass.
Preferably, the reactive current curve is extracted according to the machine-side three-phase current recording data.
Preferably, the positive sequence voltage curve is extracted according to the machine-side three-phase voltage recording data.
The invention discloses a method for automatically identifying voltage fault ride-through control parameters of a new energy converter controller, which comprises the following steps: step (1), importing a wave recording file; step (2), extracting data in the wave recording file, and carrying out data processing according to a calculation formula; and (3) deriving a control parameter identification result. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller can be used for calling wave recording data, automatically carrying out calculation and check of the control parameters and intermediate variables item by item, is low in error rate and high in calculation efficiency, and greatly improves the working efficiency of a test link.
Drawings
The invention is further illustrated by the accompanying drawings, which are not to be construed as limiting the invention in any way.
Fig. 1 is a flowchart of a method for automatically identifying voltage fault ride-through control parameters of a new energy converter controller.
Fig. 2 is a detailed flowchart of a new energy converter controller voltage fault ride through control parameter automatic identification method.
Fig. 3 is a graph of the low voltage ride through parameter identification result of embodiment 2.
Detailed Description
The technical scheme of the invention is further described with reference to the following examples. The invention relates in part to the term interpretation as follows:
the new energy converter is one of key equipment of a new energy power generation system, and is electrical equipment for finishing the change of voltage, frequency, phase number and other electric quantity or characteristics of the power system, and mainly comprises a photovoltaic inverter, a wind power converter, an energy storage converter and the like.
The voltage fault ride-through is that when the grid-connected point voltage of the new energy converter exceeds the normal operation range due to power system accidents or disturbance, the new energy converter can be ensured to continuously operate without off-grid in a specified change range and time interval. The voltage fault ride through mainly includes a low voltage ride through and a high voltage ride through.
When the voltage ride-through control parameter is a power grid fault disturbance, the electric control parameter which is related with the dynamic state and the strong transient response of the new energy converter mainly comprises a reactive high-pass current coefficient, a reactive low-pass current coefficient, an active high-pass power coefficient, an active low-pass current coefficient and an active low-pass recovery rate.
And the grid connection point is a connection point between the new energy converter and the power grid.
The control parameters of the new energy converter are automatically identified based on a semi-physical simulation test platform, high-voltage and low-voltage faults of a power grid are simulated, and the voltage and the current of the machine end of the new energy unit are recorded. And analyzing the recorded wave based on the developed automatic control parameter identification algorithm, extracting key control parameters of the new energy converter controller, and checking whether the parameters meet the technical requirements of a power grid dispatching department.
Example 1
A new energy converter controller voltage fault ride through control parameter automatic identification method, as shown in figures 1 and 2, comprises the following steps:
step (1), importing a wave recording file;
step (2), extracting data in the wave recording file, and carrying out data processing according to a calculation formula;
and (3) deriving a control parameter identification result.
The wave recording file is a low voltage ride through wave recording file or a high voltage ride through wave recording file.
The control parameter of the invention 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 reactive low-pass current coefficient, active low-pass current coefficient and active low-pass recovery rate; the high voltage ride through control parameter is reactive high-pass current coefficient and active high-pass power coefficient.
The step (3) is specifically to derive a voltage ride through control parameter identification result and a checking result in an excel text form; and (5) deriving a fundamental wave positive sequence variable calculation result and X-axis and Y-axis calculation results in a drawing form.
The step (2) of the invention specifically comprises:
step (2.1), initializing configuration of a wave recording file and calling wave recording data;
step (2.2), basic data calculation;
and (2.3) calculating voltage crossing control parameters.
The step (2.1) is specifically to configure a recording file storage path, a power rated value, a voltage rated value, a low voltage crossing threshold value, a high voltage crossing threshold value, a reactive high-pass current coefficient set value, a reactive low-pass current coefficient set value, an active high-pass current coefficient set value, an active low-pass recovery rate set value and read specified recording file content.
Step (2.2) is specifically to call three-phase voltages ua, ub, uc at the machine end of the new energy unit, three-phase currents ia, ib, ic, and calculate a fundamental wave positive sequence voltage U according to Fourier analysis and a symmetrical component method 1+ Fundamental wave positive sequence current I 1+ Fundamental wave positive sequence active power P 1+ Fundamental wave positive sequence reactive power Q 1+ Fundamental wave positive sequence active current I p1+ Fundamental wave positive sequence reactive current I q1+ The method comprises the steps of carrying out a first treatment on the surface of the And identifying the wave recording file as a high voltage ride through fault or a low voltage ride through fault according to the positive sequence voltage amplitude change condition of the fundamental wave, checking the wave recording file with characteristic characters in the wave recording name, and judging whether the wave recording file is correct or not, wherein the characteristic characters are low-pass or high-pass.
It should be noted that, the judging whether the record file is exact in the invention refers to manually storing the record file and configuring the record file name in the test loop. And (3) comparing keywords (such as high-pass and low-pass) in the names of the record files with data characteristics (whether fundamental wave positive sequence voltage enters high voltage pass or not) of the record files, and if the fundamental wave positive sequence voltage enters high voltage pass, judging that the record files are correct. The high-pass fault in the invention is that the fundamental wave positive sequence voltage amplitude is suddenly increased to be more than 1.1pu and maintained; the low pass fault is that the fundamental positive sequence voltage amplitude drops below 0.8pu and remains.
The fourier analysis and the symmetrical component method in the present invention are relatively mature algorithms in the power system, and those skilled in the art should know that they are not described in detail herein.
The step (2.3) is specifically to calculate by adopting low voltage ride through control parameters according to the step (2.3.1) when the recording file is a low voltage ride through recording file; and (3) when the wave recording file is a high-voltage ride through wave recording file, calculating by adopting high-voltage ride through control parameters according to the step (2.3.2).
Further, step (2.3.1) is specifically to calculate the reactive low-penetration current coefficient K2 according to the variable values of the X-axis and the variable values of the Y-axis in the reactive current curve and the positive sequence voltage curve respectively Iq_LV Active low pass current system K4 Ip_LV And an 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 For the moment when the voltage of the machine terminal drops to 0.9pu, t r3_LV For recovering the voltage at the machine end to 0.9p.u moment, t during voltage drop r1_LV Output reactive current continuously > I for low-pass period unit Q Time t of (2) r2_LV Output reactive current of unit for low-pass period continuously less than I Q Time t of (2) r4_LV The output reactive current of the unit after low-pass recovery is continuously less than or equal to I quit_LV Time t res_LV For low pass reactive current injection response time, t last_LV For low through reactive current injection duration, t quit_LV For low through reactive current exit time.
And the Y-axis variable value is I quit_LV And I Q 。
Wherein I is Q Is I q1+_avg0 And 0.9 DeltaI q1+_ref_LV Sum, I quit_LV Withdrawing the reference value for the low-pass reactive current; i q1+_avg0 Is the reactive current average value delta I of the steady-state interval before low-pass fault q1+_ref_LV And the reactive current average value is the steady-state interval reactive current average value of the low-pass fault.
Wherein, step (2.3.2) is specifically to calculate the reactive high-penetration current coefficient K1 according to the variable values of the X axis and the variable values of the Y axis in the reactive current curve and the positive sequence voltage curve respectively Iq_HV And an active high through current coefficient K3 Pp_HV 。
The reactive current curve is extracted according to the machine-side three-phase current recording data; and extracting the positive sequence voltage curve according to the machine-side three-phase voltage recording data.
The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller can be used for calling wave recording data, automatically carrying out calculation and check of the control parameters and intermediate variables item by item, is low in error rate and high in calculation efficiency, and greatly improves the working efficiency of a test link.
Example 2.
In step 2.2, a reactive low-pass current coefficient in calculation of a low-voltage-pass control parameter is taken as an example to describe the method for automatically identifying the voltage-fault-ride control parameter of the new energy converter controller, wherein the definition of the low-voltage-ride control parameter is shown in the following table 1.
TABLE 1 Low Voltage ride through control parameters
The method comprises the steps that a new energy unit reactive current injection judging method is adopted, and a fundamental wave positive sequence reactive current curve output by the new energy unit is extracted according to machine-side three-phase current recording data; the fundamental wave positive sequence amplitude curve of the machine terminal voltage of the new energy machine set is extracted according to the machine terminal three-phase voltage recording data. Note that the X-axis is a time axis, and each symbol represents a specific time. According to the machine-side three-phase voltage recording data, a fundamental wave positive sequence voltage amplitude curve can be extracted; according to the machine-side three-phase current recording data, a fundamental wave positive sequence current amplitude curve can be extracted; on the basis of the fundamental wave positive sequence voltage and current amplitude curve, the moment of each point is determined according to symbol definition.
Wherein the X-axis symbols and definitions are shown in table 2 below:
TABLE 2X-axis symbols and paraphraseology
Wherein the Y-axis symbols in FIG. 3 and definitions are shown in Table 3 below:
TABLE 3Y-axis symbols and paraphraseology
| (symbol) | Name and interpretation |
| U 1+ (t) | Instant value of positive sequence voltage of terminal group wave |
| I q1+ (t) | Terminal group wave positive sequence reactive current instantaneous value |
| U LV | Low pass voltage threshold, default value 0.9p.u. |
| U dip | Unit value of voltage drop at machine end |
| I q1+_avg0 | Reactive current average value in steady-state interval before low-pass fault |
| ΔI q1+_ref_LV | Reactive current injection reference during low pass |
| I Q | The sum of Iq1_avg0 and 0.9ΔIq1_ref_LV; |
| I q1+_avg_LV | reactive current average value in low-pass fault steady-state interval |
| ΔI q1+_LV | Actual measurement average value of reactive current injection during low-pass period |
| I quit_LV | Low pass reactive current exit reference |
| I N | Nominal current value, default 1.0p. |
Step 2.3.1.1, according to the fundamental positive sequence voltage (U 1+ ) And a low pass voltage threshold (U) LV ) Calculates t r0_LV 、t r3_LV 。
Step 2.3.1.2, calculating I according to formulas (C1.1.1) to (C1.1.3) Q And calculate the specific values according to the values of I and I in FIG. 3 Q And I q1+ A point in time at the intersection point of the intersection point moments of (t), namely: t is t r1_LV 、t r2_LV 。
Equation (C1.1.1):
equation (C1.1.2): ΔI q1+_ref_LV ＝K2 Iq_LV_set ×(U LV -U 1+ )×I N ；
Equation (C1.1.3): i Q ＝I q1+_avg0 +0.9×ΔI q1+_ref_LV ；
Step 2.3.1.3, calculating the reactive current exit reference value (I) according to the formula C1.1.4 quit_LV ) According to FIG. 3 according to I quit_LV And I q1+ The intersection of (t) and then t is calculated r4_LV 。
Equation (C1.1.4): i quit_LV ＝I q1+_avg0 +max(0.05I N ,0.1ΔI q1+_LV )；
Step 2.3.1.4, calculating the low-pass reactive current injection response time (t) according to formulas (C1.1.5) to (C1.1.7) res_LV ) Duration of low-pass reactive current injection (t last_LV ) Low pass reactive current exit time (t quit_LV )。
Equation (C1.1.5): t is t res_LV ＝t r1_LV -t r0_LV ；
Equation (C1.1.6): t is t last_LV ＝t r2_LV -t r1_LV ；
Equation (C1.1.7): t is t quit_LV ＝t r4_LV -t r3_LV ；
2.3.1.5 calculating the reactive low-pass current coefficient K2 according to formulas (C1.1.8) to (C1.1.10) Iq_LV 。
Equation (C1.1.8):
equation (C1.1.9): ΔI q1+_LV ＝I q1+_LV -I q1+_avg0 ；
Equation (C1.1.10): k2 Iq_LV ＝ΔI q1+_LV /[(U LV –U 1+ )×I N ](0.2p.u.≤U 1+ ≤0.9p.u.)。
Step (3) is that the new energy generator set initially outputs active powerThe initial reactive power is minus 0.02pu, the voltage of the machine end is 1.0pu, and the low-voltage fault of the machine end of the new energy machine set is simulated, wherein the fault type is asymmetrical drop, and the fault duration is 1214ms. The drawing derived by the automatic control parameter identification algorithm is shown in figure 3, wherein figure 3 (a) is the positive sequence voltage amplitude and t of the terminal group wave r0_LV And t r3_LV The method comprises the steps of carrying out a first treatment on the surface of the FIG. 3 (b) shows the positive sequence reactive current, t, of the terminal wave r1_LV 、t r2_LV And t r4_LV 、I Q 、I quit_LV The method comprises the steps of carrying out a first treatment on the surface of the FIG. 3 (c) shows the positive sequence active current amplitude, t, of the terminal wave a_LV And t b_LV The method comprises the steps of carrying out a first treatment on the surface of the The identification results of the low voltage ride through control parameters are shown in table 4.
TABLE 4 identification results of low voltage ride through key control parameters
The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller can be used for calling the recorded wave data, and calculating and checking the reactive low-pass current system in the calculation of the automatic low-voltage ride-through control parameters, so that the error rate is low, the calculation efficiency is high, and the working efficiency of a test link is greatly improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller is characterized by comprising the following steps of:
step (1), importing a wave recording file;
step (2), extracting data in the wave recording file, and carrying out data processing according to a calculation formula;
and (3) deriving a control parameter identification result.
2. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 1, wherein the method is characterized by comprising the following steps of: the wave recording file is a low voltage ride through wave recording file or a high voltage ride through wave 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-pass current coefficient, an active low-pass current coefficient and an active low-pass recovery rate; the high voltage ride through control parameter is reactive high-pass current coefficient and active high-pass power coefficient.
3. The method for automatically identifying the voltage fault ride-through control parameter of the new energy converter controller according to claim 1, wherein the step (2) includes:
step (2.1), initializing configuration of a wave recording file and calling wave recording data;
step (2.2), basic data calculation;
and (2.3) calculating voltage crossing control parameters.
4. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 3, wherein the method is characterized by comprising the following steps of: the step (3) is specifically to derive a voltage ride through control parameter identification result and a checking result in an excel text form; and (5) deriving a fundamental wave positive sequence variable calculation result and X-axis and Y-axis calculation results in a drawing form.
5. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 4, wherein the method is characterized by comprising the following steps: the step (2.1) is specifically to configure a recording file storage path, a power rated value, a voltage rated value, a low voltage crossing threshold value, a high voltage crossing threshold value, a reactive high-pass current coefficient set value, a reactive low-pass current coefficient set value, an active high-pass current coefficient set value, an active low-pass recovery rate set value and read specified recording file content.
6. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 5, wherein the method is characterized by comprising the following steps: the step (2.2) is to call the three-phase voltages ua, ub, uc, the three-phase currents ia, ib, ic at the machine end of the new energy machine set, and calculate the fundamental wave positive sequence voltage U according to Fourier analysis and a symmetrical component method 1+ Fundamental wave positive sequence current value I 1+ Fundamental wave positive sequence active power P 1+ Fundamental wave positive sequence reactive power Q 1+ Fundamental wave positive sequence active current I p1+ Fundamental wave positive sequence reactive current I q1+ The method comprises the steps of carrying out a first treatment on the surface of the And identifying the wave recording file as a high voltage ride through fault or a low voltage ride through fault according to the positive sequence voltage amplitude change condition of the fundamental wave, checking the wave recording file with characteristic characters in the wave recording name, and judging whether the wave recording file is correct or not.
7. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 6, wherein the method is characterized by comprising the following steps: the step (2.3) is specifically that when the wave recording file is a low voltage ride through wave recording file, the low voltage ride through control parameter is adopted for calculation according to the step (2.3.1); and (3) when the wave recording file is a high-voltage ride through wave recording file, calculating by adopting high-voltage ride through control parameters according to the step (2.3.2).
8. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 7, wherein the method is characterized by comprising the following steps of: the step (2.3.1) is to calculate the reactive low-penetration current coefficient K2 according to the variable value of the X axis and the variable value of the Y axis in the reactive current curve and the positive sequence voltage curve respectively Iq_LV Active low pass current coefficient K4 Ip_LV And an 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 For the moment when the voltage of the machine terminal drops to 0.9pu, t r3_LV For recovering the voltage at the machine end to 0.9p.u moment, t during voltage drop r1_LV Output reactive current continuously > I for low-pass period unit Q Time t of (2) r2_LV Output reactive current of unit for low-pass period continuously less than I Q Time t of (2) r4_LV The output reactive current of the unit after low-pass recovery is continuously less than or equal to I quit_LV Time t res_LV For low pass reactive current injection response time, t last_LV For low through reactive current injection duration, t quit_LV The low pass reactive current exit time;
the Y-axis variable value is I quit_LV And I Q ；
Wherein I is Q Is I q1+_avg0 And 0.9 DeltaI q1+_ref_LV Sum, I quit_LV Withdrawing the reference value for the low-pass reactive current; i q1+_avg0 Is the reactive current average value delta I of the steady-state interval before low-pass fault q1+_ref_LV And the reactive current average value is the steady-state interval reactive current average value of the low-pass fault.
9. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 8, wherein the method is characterized by comprising the following steps of: the step (2.3.2) is to calculate the reactive high-penetration current coefficient K1 according to the variable value of the X axis and the variable value of the Y axis in the reactive current curve and the positive sequence voltage curve respectively Iq_HV And an active high through current coefficient K3 Pp_HV 。
10. The automatic identification method for the voltage fault ride-through control parameters of the new energy converter controller according to claim 8, wherein the method is characterized by comprising the following steps of: the characteristic characters are low-pass or high-pass;
the reactive current curve is extracted according to the machine-side three-phase current recording data;
and the positive sequence voltage curve is extracted according to the machine-side three-phase voltage recording data.
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| CN117313360A (en) * | 2023-09-25 | 2023-12-29 | 中国电力科学研究院有限公司 | New energy unit fault ride-through control parameter identification method and related device |
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