High Performance Rectifier with Wide Speed Range for Direct-Drive Wind Energy System

A high performance rectifier with a novel structural and wide speed range for direct-drive wind energy system has been investigated and design. The utilization rate and efficiency of low wind are critical focus for wind energy system, in the form of ultimate output dc voltage as the optimum object, a traditional full-bridge PWM rectifier and a boost circuit for the direct-drive permanent magnet synchronous generator (PMSG) compose the novel rectifier in order to achieve the satisfying demands of high performance and low-wind speed. The design can feasible realize the maximum power point tracking (MPPT) with a modified strategy and unit power factor (UPF) control, and improve the ability greatly of full-speed operation especially. The analysis and investigation results all have been confirmed that the excellent dynamic states and steady states performances of the rectifier.