关键词: 风电机组, 电压源控制, 经典—模糊融合, 变精度概念格, 自同步电压源, 自同步机制

Abstract: To mitigate voltage fluctuations,a self-synchronous voltage source control method for wind turbines based on the classical fuzzy variable precision concept lattice was proposed. On the basis of considering the operating characteristics of wind turbines,calculated the wind energy density of wind turbines, then calculated the output power of wind turbines, analyzed the coupling relationship between wind turbine power and grid frequency, and established a self-synchronization mechanism. Based on this,a membership function was set to calculate the membership values of key parameters during the operation of wind turbines,which were then fuzzified. Multiple precision parameters were introduced to construct a classical fuzzy variable precision concept lattice. The reactive power regulation function of the wind turbine was set, and a voltage source controller was designed. Multiple parameters in the controller were adjusted to output the self-synchronous voltage source control results of the wind turbine. The experimental results showed that the voltage deviation rate of this method in practical applications was 0. 05%,which can effectively control voltage fluctuations and provided new ideas for ensuring the stability of wind turbines.

Key words: wind turbines, voltage source control, classic fuzzy fusion, variable precision concept lattice, selfsynchronizing voltage source,self-synchronization mechanism