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Forecast correction pitch variation control method for doubly-fed induction wind power generator set

A technology of wind turbines and control methods, which is applied to the control of wind turbines, wind power generation, wind turbines, etc., and can solve problems such as poor practicability, complex algorithms, and large static errors in control modes

Active Publication Date: 2014-04-23
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the establishment of fuzzy rules depends on design experience, lacks uniform standards, and the algorithm is relatively complicated and not very practical.
[0007] Using fuzzy control to realize maximum power tracking MPPT (Maximum Power Point Tracking) does not require to know the precise mathematical model of the controlled object, but only needs to provide relevant experience knowledge and operation data, which is suitable for solving nonlinear, time-consuming and Variable and hysteresis system, but this control mode has the problem of large static error

Method used

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  • Forecast correction pitch variation control method for doubly-fed induction wind power generator set
  • Forecast correction pitch variation control method for doubly-fed induction wind power generator set
  • Forecast correction pitch variation control method for doubly-fed induction wind power generator set

Examples

Experimental program
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Effect test

example 1

[0109] Add random wind variables to the wind speed model above the rated wind speed, and compare the simulated wind speed without processing and wind speed averaged fan operating curves. The simulation results are as follows Figure 7-9 shown. Depend on Figure 7-9 It is known that after the wind speed moving average preprocessing is adopted, the wind speed input to the wind turbine control system becomes smoother, the pitch angle action frequency is significantly reduced, and the output active power fluctuation of the wind turbine is reduced. Because the random wind always exists during the actual operation of the wind turbine , through comparison and simulation, it can be seen that the wind speed pretreatment can effectively improve the power quality of the wind turbine access point.

example 2

[0111] The simulation sets the basic wind speed to 8m / s, the maximum gust to 3m / s, the start time to 10s, and the gust to maintain for 60s. The simulation results are as follows Figure 10-13 shown. Depend on Figure 10-13 It can be seen that when the wind speed is lower than the rated wind speed, the pitch control system maintains the optimal pitch angle of 0°, and the output power of the wind turbine increases cubically with the increase of the wind speed. When the wind speed is close to the rated wind speed, the allowable pitch The angle is moved in advance to prevent mechanical damage to the mechanical structure of the wind turbine due to overload, but at this time the fan speed is still within the allowable range of the fan system. The improved pitch control method keeps the optimal pitch angle unchanged, and the output power of the wind turbine Higher than the output power under the traditional pitch control method. Comparing the two sets of simulation results, it can ...

example 3

[0113] The simulation sets the basic wind speed to 11m / s, the maximum gust to 4m / s, the start time to 10s, and the gust to maintain for 60s. The simulation results are as follows Figure 14-17 shown. Depend on Figure 14-17 It can be seen that when the wind speed exceeds the rated wind speed, the pitch angle obtained by the two pitch control methods increases with the increase of the wind speed, and the mechanical power of the wind turbine is limited by changing the pitch angle to not exceed its rated power. Comparing the two sets of simulation results, it can be seen that the improved pitch control method is faster than the traditional pitch control method, can more effectively maintain the active power of the wind turbine near the rated power, and can better limit the speed of the wind turbine at Near the set value, prevent the mechanical damage of the wind turbine caused by long-term overspeed operation of the wind turbine, and ensure the safe and stable operation of the w...

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Abstract

The invention provides a forecast correction pitch variation control method for a doubly-fed induction wind power generator set, and belongs to the technical field of fan pitch variation control. The method comprises the following steps of: preprocessing wind speed; determining a forecast value of a pitch angle beta; and performing deviation correction on the forecast value of the pitch angle beta. The practicability is high; the wind energy conversion efficiency of the wind power generator set at low wind speed can be improved, and the wind power generator set can be effectively controlled to run without exceeding the speed limit at high wind speed; the wind power generator set can run safely and stably; the economic cost is low; and the method is suitable for pitch variation control systems of doubly-fed induction wind power generator sets at different power levels.

Description

technical field [0001] The invention belongs to the technical field of wind turbine pitch control, and in particular relates to a method for forecasting and correcting pitch control of a double-fed induction wind turbine. Background technique [0002] As one of the most technologically mature clean energy sources, wind power has developed rapidly in countries all over the world. With the development of wind power generation technology, variable-speed constant-frequency wind turbines have become the mainstream models of grid-connected wind power generation. Due to the randomness and uncertainty of wind energy, it is difficult for wind turbines to stabilize the power fluctuations caused by wind speed changes through self-regulation, especially when the wind speed exceeds the rated wind speed, which is more obvious. [0003] The pitch control system realizes the full use of wind energy by adjusting the pitch angle of the wind turbine, smoothes the power output of the wind turb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D7/00
CPCY02E10/723Y02A30/00Y02E10/72
Inventor 钱敏慧陈宁朱凌志赵亮赵大伟陈梅吴福保丁杰吕宏水
Owner CHINA ELECTRIC POWER RES INST
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