To meet the high reliability requirements of high-power direct-driven wind turbine， the back-to-back carrier phase-shifting parallel dual PWM converter is used as the power exchange unit of permanent magnet direct-driven wind turbine. Its characteristics of redundancy， modularization， and reduced switching ripple are analyzed. The circular current between the carrier phase shifting parallel converters are analyzed， and a new method to suppress low order harmonic circular current is proposed. Furthermore， the implementation of the power converter controller based on FPGA to realize the carrier phase shifting parallel control is given. The experiments show that the proposed converter can satisfy the system demands of reliability， circulation current control， spectrum of output current and the hardware implementation， and is suitable for the direct-driven wind turbine.