A Low-Cost Wind Generator System with a Permanent Magnet Synchronous Generator and Diode Rectifiers

Abstract

A low-cost wind  generator systemfor  small-  or  medium-scale  wind  generator  is  pro-posed.   The  system  consists  of  a  permanent  mag-net synchronous generator (PMSG) with two sets ofthe three-phase stator windings, i.e.  six-phase sta-tor winding, two three-phase diode rectifiers, a boostchopper, and a three-phase pulse-width modulation(PWM) inverter. Since two sets of three-phase statorwindings are spatially shifted by 30 electrical degrees,the  system  can  cancel out  the  dominant harmonicmagnetomotive forces (MMF) produced by the har-monic currents of diode rectifiers. The simulation andexperimental results show that the proposed systemcan significantly reduce the pulsation of the devel-oped torque and the DC current by more than 60 %in comparison with the conventional system consist-ing of a three-phase PMSG and a three-phase dioderectifier.  Therefore, the proposed system can use asmaller smoothing reactor in the boost chopper, sothat the lower initial cost can be realized, and it issuitable for small- or medium-scale wind generatorsystems.