Simulation of Modified Rectifier System for Variable Speed High Power PMSG Wind Turbine by using Filter

This paper present modified rectifier system subsist of three thyristors and two three phase diode bridges for variable-speed high-power permanent-magnet synchronous generator (PMSG) in wind energy conversion systems (WECSs) in addition with filter. The recommended modified rectifier has several eminent features such as simplicity, low cost and low loss. Its feature to cascade the input voltages allows it to properly manage generator speed even when the wind velocity sink to half of the rated value. This feature is identical to a voltage boost function that cannot be found in conventional diode or thyristor rectifiers. Due to nature of a diode-thyristor rectifier, it generates harmonic currents. Also the resultant torque ripple and harmonic loss in the generators are also higher. In this we alleviated this problem by adding filters which is also verified by simulation result. The operating principle of the rectifier is elaborated. Its use and control in the WECS is presented and are verified by simulation results.