Design of single-phase power converters for wind power systems with permanent-magnet synchronous generators

This paper is concerned with the design and implementation of a power controller for variable-speed permanent-magnet synchronous generators. In this system, ac-to-dc and dc-to-ac power converters are designed to convert single-phase, three-wire, variable-voltage and variable-frequency power generated by synchronous generator to that with constant-voltage and constant-frequency. In ac-to-dc power converter, the half-controlled, three-phase rectifier is built to implement the sequential-switching of switches in power converter; therefore, no rotor-position detector is needed for power converter connected with generators. The dc-to-ac power converter controlled by differential- and common- voltage modes is designed for a single-phase, three-wire inverter to yield balanced output voltage under unbalanced loads. A low-cost, 32-bit digital signal processor (DSP, TMS320F2808) is used to implement the combined drive system of generator with 220W capacity. Experiments are given to justify the analysis.