Restrain Method Research For The Voltage Fluctuation And Flicker Caused By Wind Power

With the improvement of the manufacture level of wind turbines and governments to encourage and support for wind power, wind power installed scale is bigger and bigger.At the same time, the technological progress of blade material and the wind design level make the unit capacity increases, from the original 10 KW to MW unit today.The bigger unit capacity means the better benefits, but also inevitably increases the size of the wind turbine.The higher tower and the greater radius, the wind turbine is affected by the tower shadow and wind shear effect much more.The output power fluctuations,as a result, will be more and more serious, may be limited by the grid power quality standards.The purpose of this paper is to improve the wind power quality, solve one of the effects of power fluctuation, voltage fluctuation and flicker problem.This article started from the reason of voltage fluctuation and flicker at the PCC of wind farm,compared the pros and cons of various inhibition method, designed a controller to compensate the fluctuation of active power of wind farm.The main job is to build dynamic wind speed model considering the effect of tower shadow and wind shear,wind generator system model, pitch control system model and the voltage fluctuation and flicker suppression controller model.From the simulation results we can see that, the control system with a smaller wind turbine with pitch control system applied to the entire wind farm to suppress the voltage fluctuation and flicker at PCC, can be tested by the experimental data. What’s more,it has many advantages such as efficient, lower cost and better result.