China's wind power capacity is increasing so rapidly that some areas are not able to consume all the produced wind power. Therefore, it has already become the inevitable trend in wind power integration to achieve the controlled operation of wind turbine. This paper first offers a method to predict the maximum generation capacity of every type of wind turbine, including both under-controlled wind turbine and uncontrolled wind turbine. And then a strategy for active power control of wind farm based on the predicting results is proposed. Considering thoroughly the active power fluctuation of wind turbine and the error of the prediction, the strategy adopts both long and short controlling periods to carry out coordinated optimization control. The simulation results show that the strategy can keep the active power output of wind farm in step with the control order, and consequently the generating efficiency is improved. In addition, the strategy is also applicable to the wind farm with some uncontrollable wind turbines, and the controlling precision can be satisfied.
Received 30 July 2012Accepted 06 February 2013Published online 19 February 2013
This work was supported by National High Technology Research and Development Program of China (863 Program) (No. 2011AA05A101).
Article outline: I. INTRODUCTION II. MAXIMUM GENERATION CAPACITY PREDICTION OF EVERY WIND TURBINE A. Predicting the next-period maximum generation capacity of uncontrolled turbine B. Calculation of the maximum generation capacity of under-controlled turbine III. ACTIVE POWER CONTROL STRATEGY A. Distribution function B. Prompt adjusting function IV. RESULTS AND DISCUSSION A. Conditions B. Indicators for evaluation on controlling effects C. Result comparison V. CONCLUSION
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