A new WECS of Half-Direct Coupling structure and its MPPC control strategy on back to back PWM converters

This paper presents a new scheme of the wind system with Half-Direct Coupling (HDC) WECS to solve the problems in the Direct-Diver Coupling (DDC) Wind Energy Conversion System (WECS), because of too large scale WECS in practice. The proposed scheme is only added a small ratio gear to the system between the large wind turbine and the Permanent Magnet Synchronous Motor (PMSM). A PWM AC-DC converter with SVPWM control method is proposed for the Peak Power Tracking (PPT) control. Some simulation tests of the proposed system and control strategies have been developed based on Matlab/Simulink. The simulation results verified the feasibility of the proposed system.