Fuzzy-PI and feedforward control strategy of DFIG wind turbine

Abstract

This document researches converter control of DFIG-based wind turbine, focus on the problem of DC voltage stability. According to the traditional SVPWM control strategy, a new control strategy is presented. This new control strategy uses Fuzzy-PI control that can modify PI parameters in real-time, and using feedforward control strategy to predict variation trend which can decrease overstrike. A simulation model, which represents the converter of doubly fed induction generator system is built-in MATLAB, and simulation results which are under symmetry grid voltage fault condition are given that illustrate the excellent performance characteristics of the Fuzzy- PI compound control system. The new control strategy has concise structure and more stable performance. Compared with traditional control strategy, the new one will not increase hardware cost, so it will have a bright future in engineering application.