Study on Optimal Wind Energy Tracking Sensorless Control of Direct Driven Six-phase WECS

Six-phase permanent magnet synchronous generator(PMSG) combining parallel connected converters is used to improve capacity and reliability of direct driven wind energy conversion system(WECS).To eliminate failure of the system caused by speed encoder,speed sensorless vector control strategies are adopted.Model reference adaptive system for PMSG rotor speed and position estimation methods are introduced.A combination of optimal tip-speed method and hill-climbing method of optimal wind energy tracking method is proposed.Six-phase PMSG vector control strategies are proposed.It simulates the process of six-phase motor tracking optimal wind energy with a sudden change in wind speed.Based on the modeling and simulating,a control system for WECS is designed.The experimental results show the converter system has good characteristics on static state or dynamic state as the base of the whole direct driven six-phase WECS.