CN115898791A - Wind turbine generator set wind error correction method and system - Google Patents
Wind turbine generator set wind error correction method and system Download PDFInfo
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- CN115898791A CN115898791A CN202211582157.0A CN202211582157A CN115898791A CN 115898791 A CN115898791 A CN 115898791A CN 202211582157 A CN202211582157 A CN 202211582157A CN 115898791 A CN115898791 A CN 115898791A
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Abstract
The invention relates to a method and a system for correcting wind errors of a wind turbine generator, and belongs to the technical field of wind power generation. The wind error correction method of the wind generating set comprises the steps of acquiring operation data regularly, then obtaining a wind deviation measured value, an operation index and an operation index threshold value in real time, determining a correction value, then correcting the wind deviation measured value in real time by using the calculated correction value to obtain a wind error, and then controlling the wind generating set to execute yawing action in real time by using the wind error; the method can greatly reduce the complexity of data analysis, reduce the calculated amount of data analysis, enable the online automatic operation of the data analysis process to be possible, and provide conditions for reducing the operating cost of the wind power plant.
Description
Technical Field
The invention relates to a method and a system for correcting wind errors of a wind turbine generator, and belongs to the technical field of wind power generation.
Background
The earliest wind offset measurement scheme is that the measurement value of a wind direction indicator is directly used as wind offset, but later, the wind offset value measured by the wind direction indicator is inaccurate, on one hand, the deviation of the installation position of the wind direction indicator can bring a wind direction measurement error b, and on the other hand, wake flow behind a wind wheel can change the wind direction, so that the measurement deviation of the wind direction indicator is caused. Technical personnel study the wake flow property, calculate wind direction correction value e according to the wind wheel rotational speed, the error of the measured value phi of the anemoscope obtained after the measured value of the anemoscope is corrected by the wind direction correction value is greatly reduced, but the wind error caused by the deviation of the mounting position of the anemoscope is not solved, in recent years, various correction methods of the measured value of the wind deviation appear in the field of wind power, and the correction methods basically adopt the scheme as shown in fig. 1: the wind error is equal to the result of correcting the wind deviation measurement Φ, i.e.: and for the wind error theta = phi-b, the wind deviation measured value phi is the sum of a anemoscope measured value alpha and a wind direction corrected value e, and the wind direction corrected value e is the deviation of the anemoscope measured value alpha calculated according to the rotating speed of the wind wheel. Because the anemoscope measurement value may still have a deviation after being corrected by the wind direction correction value e, a technician analyzes the correction value b for the wind error measurement value off-line according to the wind error zone distribution and the wind turbine operation indexes corresponding to each zone. And the wind error measurement value is corrected by the correction value b and then is output to the yaw controller as a wind error feedback value theta, and the yaw controller controls the wind generating set to execute a yaw action according to the wind error so as to enable the wind wheel of the fan to face the wind direction. However, the existing wind driven generator wind error correction method has the following problems: (1) The extraction of the correction value b requires a large number of data samples, the analysis process is complex, the calculation amount is large, and the method is only suitable for off-line operation; (2) Technicians need to collect data regularly, analyze and summarize the data, and finally modify the software parameters of the wind driven generator according to the analysis result, so that the running cost of the wind driven generator is increased; (3) The wind driven generator sample data contains strong noise signals, and the accuracy of results is influenced.
Therefore, it is urgently needed to develop a method for correcting the wind errors of the wind generating set, which is simple in operation, low in operation cost and high in accuracy of the correction result.
Disclosure of Invention
The invention aims to provide a method for correcting the wind errors of a wind turbine generator set, which is simple to operate, low in operation cost and high in accuracy of correction results.
The invention further aims to provide a wind turbine generator system for correcting wind errors.
In order to achieve the purpose, the wind error correction method of the wind turbine generator adopts the technical scheme that:
a method for correcting wind errors of a wind turbine generator comprises the following steps:
(1) Collecting operation data of the wind turbine generator in real time, and eliminating abnormal values in the operation data to obtain target data; the operational data includes wind speed, air density in the wind farm, rotor speed, output electrical power, and anemometer measurements;
(2) Performing programmed operation on the target data according to a set period to obtain an average value, an operation index and an operation index threshold of the wind deviation measured values in the set period, correcting the corrected values, then performing real-time correction on the wind deviation measured values by using the corrected values to obtain wind deviation errors, and then controlling the wind generating set to perform yaw action in real time by using the wind deviation errors; the correction value is 0 before the initial correction;
the correction value is corrected as follows:
if the programmed operation is primary operation, the corrected correction value after the primary operation is the average value of the wind deviation measured values obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, and if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the corrected correction value in the current operation is equal to the corrected correction value in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, the corrected correction value b in the current operation i ＝k×x i +b i-1 (ii) a Wherein, b i For corrected correction values, x, during the run i ＝Φ i -b i-1 ，Φ i Average of the wind deviation measurements for this run, b i-1 The corrected correction value is obtained in the last operation; 0<k<1。
The wind error correction method of the wind turbine generator set can greatly reduce the complexity of data analysis and reduce the calculated amount of data analysis, so that the online automatic operation of the data analysis process becomes possible, and conditions are provided for reducing the operation cost of a wind power plant.
It can be understood that the wind deviation measured value phi = alpha + e, where alpha is a anemoscope measured value, e is a wind direction correction value, and the wind direction correction value e is calculated according to the rotation speed of the wind wheel; therefore, the measured value of the wind deviation can be calculated by utilizing the rotating speed of the wind wheel and the measured value of the anemoscope in the operation data.
The average value of the measured values of the windage deviation obtained in a certain operation refers to the ratio of the sum of the measured values of the windage deviation calculated according to the data points in the target data in the period to the number of the data points.
It can be understood that k is set manually, and the value range of k is: the smaller the values of 0< -k < -1 >, k, the slower the speed of the correction value b approaching the accurate value, but the smaller the noise interference of the input data (the input data is 1min wind turbine variable data including the wind deviation measurement value and the operation index) has on the result, whereas the faster the correction value approaches the accurate value, but the more sensitive it is to the noise interference.
Preferably, the operation index is a wind energy utilization coefficient.
Preferably, the operation index threshold is calculated as follows:
if the programmed operation is the primary operation, the operation index threshold value obtained in the primary operation is equal to the operation index obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, and if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the operation index threshold obtained in the current operation is equal to the operation index threshold obtained in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold value obtained in the last operation, the operation index threshold value C obtained in the current operation i Calculated from equation 1:
in the formula 1, C i For the threshold value of the operation index to be obtained during this operation, C i-1 Threshold value of the operation index, C, obtained for the last operation pi And obtaining the operation index for the operation.
Preferably, the set period is not more than 1min. For example, the set period is 1min. Because wind speed usually fluctuates, the duration of the medium wind speed (4.5-10 m/s) condition is usually short, and the smaller the set period is, the more the intercepted data segments are, the faster the updating speed of the wind direction correction value b is, so that the correction value b can be quickly optimized. However, the setting period cannot be too short, the averaging of the wind deviation measured values is to reduce the influence of accidental errors, the averaging effect is deteriorated if the setting period is too short, two factors are balanced, and the setting period of 1min is found to be appropriate through tests.
Preferably, the abnormal value refers to the operation data under the abnormal working condition meeting the following conditions:
the wind turbine generator is in the states of failure, shutdown, maintenance, standby and limited power;
the wind speed is less than 4.5m/s;
the wind speed is more than 10m/s;
the instantaneous value of the pitch angle of the unit is less than-0.1 degree;
the instantaneous value of the pitch angle of the assembly is greater than 0.1 deg.
The wind driven generator usually has a large amount of time to work under the working condition of medium wind speed (4.5 m/s-10 m/s), the wind driven generator operates stably under the working condition, and the pitch angle shakes near 0 degrees. And abnormal values in the operation data are removed, so that the working state of the operation data when the wind driven generator is stable can be ensured, the interference factors of data analysis can be reduced, and the accuracy of the data analysis result (namely the yaw error correction value b) is improved.
It is understood that the wind energy utilization coefficient Cp is calculated using equation 2:
in formula 2, cp is the wind energy utilization ratio, P absorb For the wind energy absorbed by the rotor, P wind Is wind energy passing through the plane of the wind wheel; p e The electric energy (most of the wind energy absorbed by the wind wheel is converted into electric energy to be output to a power grid) can be measured by a generator ammeter, P m For the rotational kinetic energy of the rotor (another part of the wind energy absorbed by the rotor is converted into rotational kinetic energy), P m Can be obtained by calculation according to the rotating speed of the wind wheel; t is time, rho is air density in the wind power plant, S is the wind sweeping area of the wind wheel, and v is the wind speed measured by the wind driven generator;
kinetic energy of rotation P m The calculation method of (2) is as follows: let t 1 The sampling value of the rotating speed of the wind wheel collected by the rotating speed sensor of the wind wheel at any moment is omega 1 ，t 2 The sampling value of the rotating speed of the wind wheel collected by the rotating speed sensor of the wind wheel at any moment is omega 2 Then the wind wheel is from t 1 Time to t 2 The rotational kinetic energy increased at the moment is calculated by equation 3:
in formula 3, P m Is from t 1 Time t 2 Rotational kinetic energy, omega, increasing in time 1 Is t 1 Wind wheel speed at time, omega 2 Is t 2 The wind wheel rotating speed at the moment, J is the wind wheel moment of inertia.
Therefore, the wind energy utilization coefficients in different time periods can be calculated through the operation data and the acquisition time; the operational data includes wind speed, air density in the wind farm, rotor speed, output electrical power, and anemometer measurements.
The wind error correction system of the wind turbine generator adopts the technical scheme that:
a wind error correction system of a wind turbine generator comprises a data acquisition module, a data elimination module, an online data analysis module and a control execution module; the data acquisition module is used for acquiring the operation data of the wind turbine generator in real time; the data removing module is used for removing abnormal values from the running data to obtain target data; the online data analysis module is used for performing programmed operation on the target data according to a set period to obtain an average value, an operation index and an operation index threshold value of the wind deviation measured value in the set period, correcting the corrected value, and then correcting the wind deviation measured value in real time by using the corrected value to obtain a wind deviation error; and the control execution module is used for controlling the wind generating set to execute a yaw action in real time by utilizing the wind error.
According to the wind error correction system for the wind turbine generator, the correction value is corrected according to a certain time period by adopting the online data analysis module with simple data analysis and low data analysis calculation amount, the wind error is obtained, and the wind error is utilized to control the wind turbine generator to perform yaw action, so that the online automatic operation of the data analysis process becomes possible, and conditions are provided for reducing the operation cost of a wind power plant.
Preferably, in the system for correcting the wind error by the wind turbine, the abnormal value refers to operation data under an abnormal working condition meeting the following conditions:
the wind turbine generator is in a state including failure, shutdown, maintenance, standby and power limitation;
the wind speed is less than 4.5m/s;
the wind speed is more than 10m/s;
the instantaneous value of the pitch angle of the unit is less than-0.1 degree;
the instantaneous value of the pitch angle of the assembly is greater than 0.1 deg.
Preferably, in the wind error correction system of the wind turbine, the correction value is 0 before the initial correction; the correction value is corrected as follows:
if the programmed operation is the primary operation, the corrected correction value after the primary operation is the average value of the measured values of the wind deviation obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the corrected correction value in the current operation is equal to the corrected correction value in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold value obtained in the last operation, the corrected correction value b in the current operation i ＝k×x i +b i-1 (ii) a Wherein, b i For corrected correction values, x, during the run i ＝Φ i -b i-1 ，Φ i Average of the wind deviation measurements for this run, b i-1 The corrected correction value is obtained after the correction in the last operation; 0<k<1。
Preferably, in the wind error correction system of the wind turbine, the operation index is a wind energy utilization coefficient.
Preferably, in the wind error correction system of the wind turbine, the calculation method of the operation index threshold value is as follows:
if the programmed operation is the primary operation, the operation index threshold value obtained in the primary operation is equal to the operation index obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, and if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the operation index threshold obtained in the current operation is equal to the operation index threshold obtained in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold value obtained in the last operation, the operation index threshold value C obtained in the current operation i Calculated from equation 1:
in the formula 1, C i For the threshold value of the operation index to be obtained during this operation, C i-1 Threshold value of the running index, C, obtained for the last run pi And obtaining the operation index for the operation.
Drawings
FIG. 1 is a schematic flow chart of a method for correcting a wind deviation measurement value in the existing wind power field;
fig. 2 is a schematic flow chart of a method for correcting a wind error by a wind turbine generator according to embodiment 1;
fig. 3 is a flowchart illustrating a method of calculating an operation index threshold value and a method of correcting a correction value in embodiment 1.
Detailed Description
The technical solution of the present invention is further described below with reference to specific examples.
1. The embodiment of the wind error correction method of the wind turbine generator set is as follows:
example 1
The method for correcting the wind error by the wind turbine generator according to the embodiment, as shown in fig. 2, includes the following steps:
(1) Acquiring operation data of the wind turbine generator in real time, and then eliminating abnormal values in the operation data to obtain target data; the operational data includes wind speed, air density in the wind farm, rotor speed, output electrical power, and anemometer measurements; the abnormal value refers to the operation data under the abnormal working condition meeting the following conditions:
the wind turbine generator is in the states of failure, shutdown, maintenance, standby and limited power;
the wind speed is less than 4.5m/s;
the wind speed is more than 10m/s;
the instantaneous value of the pitch angle of the unit is less than-0.1 degree;
the instantaneous value of the pitch angle of the unit is larger than 0.1 degree;
(2) Performing programmed operation on target data according to a set period (1 min) to obtain an average value, an operation index and an operation index threshold value of the wind deviation measured values in the set period, correcting the corrected values, then performing real-time correction on the wind deviation measured values by using the corrected values to obtain wind deviation errors, and then controlling the wind generating set to perform yaw action in real time by using the wind deviation errors; the correction value is 0 before the primary correction;
take a setting period as an example, at t i Time of day will t i Performing programmed operation on target data within 1min before the moment to obtain t i Correcting the average value, the operation index and the operation index threshold value of the wind deviation measured value within 1min before the moment; t is t i The time when the correction value is corrected for the ith time;
the average of the wind deviation measurements is equal to t i The ratio of the sum of the measured values of the wind deviation to the number of data points in the target data within 1min before the moment; the operation index is the wind energy utilization coefficient;
the method of obtaining the operation index threshold value and the method of correcting the correction value (ae in fig. 3 corresponds to x as shown in fig. 3) are as follows:
if the programmed operation is a first run (i.e., first corrected correction value), i =1, then the first corrected correction value is equal to t 1 Average value of wind deviation measured values within 1min before the moment, and the moment t 1 Corrected value after correctionIs named as b 1 (ii) a Operation index threshold value C obtained in initial operation 1 Is equal to t 1 The wind energy utilization coefficient within 1min before the moment;
if the programmed operation is not the initial operation (i.e. the initial correction value is not greater than 2), then t is calculated first i The wind energy utilization coefficient within 1min before the moment, if the wind energy utilization coefficient obtained in the current operation is less than or equal to the operation index threshold obtained in the last operation, the corrected correction value in the current operation is equal to the corrected correction value in the last operation, namely b i ＝b i-1 ，b i Corrected correction value for i-th run, b i-1 The corrected correction value is the corrected correction value in the i-1 st operation; the operation index threshold value obtained in the current operation is equal to the operation index threshold value obtained in the last operation;
the wind energy utilization coefficient obtained if the operation is performed at this time>If the operation index threshold value is obtained in the previous operation, the corrected correction value = kxx in the current operation i +b i-1 ；x i ＝Φ i -b i-1 ，Φ i Is t i Average of wind deviation measurements within 1min before the moment, b i-1 At a time t i-1 A corrected value after temporal correction; 0<k<1; meanwhile, the operation index threshold C obtained in the operation of the time is calculated i Calculated from equation 1:
in the formula 1, C i For the threshold value of the operation index to be obtained during this operation, C i-1 Threshold value of the running index, C, obtained for the last run pi Obtaining an operation index for the current operation;
the wind energy utilization coefficient Cp is calculated by equation 2:
in formula 2, cp is the wind energy utilization ratio, P absorb For the wind energy absorbed by the rotor, P wind Is wind energy passing through the plane of the wind wheel; p is e The electric energy (the most of the wind energy absorbed by the wind wheel is converted into electric energy and output to the power grid) can be measured by a generator ammeter, P m For the rotational kinetic energy of the rotor (another part of the wind energy absorbed by the rotor is converted into rotational kinetic energy), P m Can be obtained by calculation according to the rotating speed of the wind wheel; t is time, rho is air density in the wind power plant, S is the wind sweeping area of a wind wheel, and v is the wind speed measured by the wind driven generator;
kinetic energy of rotation P m Is calculated (in t) 1 Time to t 2 The time period between the moments is for example) as follows: let t 1 The sampling value of the rotating speed of the wind wheel collected by the rotating speed sensor of the wind wheel at any moment is omega 1 ，t 2 The sampling value of the rotating speed of the wind wheel collected by the rotating speed sensor of the wind wheel at any moment is omega 2 When the wind wheel is driven from t 1 Time t 2 The rotational kinetic energy increased at the moment is calculated by equation 3:
in formula 3, P m Is from t 1 Time to t 2 Rotational kinetic energy, omega, increasing in time 1 Is t 1 Wind wheel speed at time, omega 2 Is t 2 The wind wheel rotating speed at the moment, J is the wind wheel moment of inertia.
2. The embodiment of the wind turbine generator wind error correction system of the invention is as follows:
example 2
The system for correcting the wind error of the wind turbine generator set comprises a data acquisition module, a data elimination module, an online data analysis module and a control execution module; the data acquisition module is used for acquiring the operation data of the wind turbine generator in real time; the data eliminating module is used for eliminating abnormal data from the running data to obtain target data; the online data analysis module is used for performing programmed operation on target data according to a set period to obtain an average value, an operation index and an operation index threshold value of the wind deviation measured value in the set period, correcting the corrected value, and then correcting the wind deviation measured value in real time by using the corrected value to obtain a wind deviation error; the control execution module is used for controlling the wind generating set to execute a yawing action in real time by utilizing the wind error;
wherein, the abnormal value refers to the operation data under the abnormal working condition meeting the following conditions:
the wind turbine generator is in the states of failure, shutdown, maintenance, standby and limited power;
the wind speed is less than 4.5m/s;
the wind speed is more than 10m/s;
the instantaneous value of the pitch angle of the unit is less than-0.1 degree;
the instantaneous value of the pitch angle of the unit is greater than 0.1 degree;
the calculation method of the operation index threshold value and the correction value correction method are as follows:
if the programmed operation is the primary operation, the correction value obtained in the primary operation is the average value of the wind deviation measurement values obtained in the primary operation, and the operation index threshold value obtained in the primary operation is equal to the operation index obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the corrected correction value in the current operation is equal to the corrected correction value in the last operation, and the operation index threshold obtained in the current operation is equal to the operation index threshold obtained in the last operation;
if the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, the corrected correction value b in the current operation i ＝k×x i +b i-1 (ii) a Wherein, b i Corrected correction value for this run time, x i ＝Φ i -b i-1 ，Φ i Average of the wind deviation measurements taken during this run, b i-1 The corrected correction value is obtained after the correction in the last operation; 0<k<1; the current operation is calculatedOperation index threshold value C i Calculated from equation 1:
in the formula 1, C i For the threshold value of the operation index to be obtained during this operation, C i-1 Threshold value of the operation index, C, obtained for the last operation pi And obtaining the operation index for the operation.
Claims (9)
1. A wind turbine generator wind error correction method is characterized by comprising the following steps:
(1) Collecting operation data of the wind turbine generator in real time, and eliminating abnormal values in the operation data to obtain target data; the operational data includes wind speed, air density in the wind farm, rotor speed, output electrical power, and anemometer measurements;
(2) Performing programmed operation on the target data according to a set period to obtain an average value, an operation index and an operation index threshold value of the wind deviation measured values in the set period, correcting the corrected value, correcting the wind deviation measured values in real time by using the corrected value to obtain a wind deviation error, and controlling the wind generating set to perform yaw action in real time by using the wind deviation error; the correction value is 0 before the initial correction;
the correction value is corrected as follows:
if the programmed operation is primary operation, the corrected correction value after the primary operation is the average value of the wind deviation measured values obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the corrected correction value in the current operation is equal to the corrected correction value in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold value obtained in the last operation,corrected correction value b at this run time i ＝k×x i +b i-1 (ii) a Wherein, b i Corrected correction value for this run time, x i ＝Φ i -b i-1 ，Φ i Average of the wind deviation measurements for this run, b i-1 The corrected correction value is obtained after the correction in the last operation; 0<k<1。
2. The method for wind turbine generator system wind error correction of claim 1, wherein the operation index is a wind energy utilization factor.
3. The method for correcting wind errors by a wind turbine according to claim 2, wherein the operation index threshold is calculated as follows:
if the programmed operation is primary operation, the operation index threshold value obtained in the primary operation is equal to the operation index obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, and if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the operation index threshold obtained in the current operation is equal to the operation index threshold obtained in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, the operation index threshold C obtained in the current operation i Calculated from equation 1:
in formula 1, C i For the threshold value of the operation index to be obtained during this operation, C i-1 Threshold value of the running index, C, obtained for the last run pi And obtaining the operation index for the operation.
4. Method for correcting wind errors by a wind turbine according to any of claims 1 to 3, characterised in that the set period is not greater than 1min.
5. The method for correcting the wind error of the wind turbine generator set according to any one of claims 1 to 3, wherein the abnormal value refers to operation data under an abnormal condition meeting the following conditions:
the wind turbine generator is in a state including failure, shutdown, maintenance, standby and power limitation;
the wind speed is less than 4.5m/s;
the wind speed is more than 10m/s;
the instantaneous value of the pitch angle of the unit is less than-0.1 degree;
the instantaneous value of the pitch angle of the assembly is greater than 0.1 deg.
6. A wind error correction system of a wind turbine generator is characterized by comprising a data acquisition module, a data rejection module, an online data analysis module and a control execution module; the data acquisition module is used for acquiring the operating data of the wind turbine generator in real time; the data removing module is used for removing abnormal values from the running data to obtain target data; the online data analysis module is used for performing programmed operation on the target data according to a set period to obtain an average value, an operation index and an operation index threshold value of the wind deviation measured value in the set period, correcting the corrected value, and then correcting the wind deviation measured value in real time by using the corrected value to obtain a wind deviation error; and the control execution module is used for controlling the wind generating set to execute a yaw action in real time by utilizing the wind error.
7. The wind turbine generator wind error correction system of claim 6, wherein the correction value is 0 prior to the initial correction; the correction value is corrected as follows:
if the programmed operation is the primary operation, the corrected correction value after the primary operation is the average value of the measured values of the wind deviation obtained in the primary operation;
if programThe sequencing operation is non-primary operation, whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation is judged, and if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the corrected correction value in the current operation is equal to the corrected correction value in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold value obtained in the last operation, the corrected correction value b in the current operation i ＝k×x i +b i-1 (ii) a Wherein, b i For corrected correction values, x, during the run i ＝Φ i -b i-1 ，Φ i Average of the wind deviation measurements for this run, b i-1 The corrected correction value is obtained after the correction in the last operation; 0<k<1。
8. The wind turbine correction system for wind errors of claim 6, wherein the operation index is a wind energy utilization factor.
9. The wind turbine generator system for wind error correction according to claim 8, wherein the operation index threshold is calculated as follows:
if the programmed operation is the primary operation, the operation index threshold value obtained in the primary operation is equal to the operation index obtained in the primary operation;
if the programmed operation is non-primary operation, firstly judging whether the operation index obtained in the current operation is larger than the operation index threshold obtained in the last operation, and if the operation index obtained in the current operation is not larger than the operation index threshold obtained in the last operation, the operation index threshold obtained in the current operation is equal to the operation index threshold obtained in the last operation; if the operation index obtained in the current operation is larger than the operation index threshold value obtained in the last operation, the operation index threshold value C obtained in the current operation i Calculated from equation 1:
in the formula 1, C i For the threshold value of the operation index to be obtained during this operation, C i-1 Threshold value of the running index, C, obtained for the last run pi And obtaining the operation index for the operation.
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