Dynamic optimal reactive power compensation control strategy in wind farms of DFIG

Abstract

More concerns are given to the reasonable reactive power compensation with the rapid development of wind farms. This study aims to propose an optimal compensation control strategy for Doubly Fed Induction Generator (DFIG)-based wind farms, where the power output varies along with the different wind speed. Firstly, simulation models of wind speed and DFIG are constructed in MATLAB to find the relationship between wind speed and power. Then the Improved Analytic Hierarchy Process (IAHP) is applied to obtain the weights of each factor and a function is presented to calculate the final evaluation value, when considering constrained factors like economy and effectiveness. The optimal compensation strategy is obtained to select appropriate device with minimum function value at the particular wind speed. Calculated results have shown that the proposed strategy can better meet the demand of dynamic reactive power in wind farms, which has a great significance of guiding engineering practice.