Implementation of grid connected using 12 pulse converter for a variable speed wind energy conversion system

This paper presents the electrical power conversion system is developed for a variable speed wind turbine system. In the wind energy conversion system a synchronous generator converts the mechanical energy into electrical energy. As the voltage and frequency of generator output vary along the wind speed change, a B6 rectifier and inductor are utilized to maintain constant dc link current. The average power is converted entirely by the 12-pulse converter, it´s consists of a two series-connected, current-source inverters. Line side current-source inverters supply currents into the utility line by regulating the dc link voltage. The active power is controlled by firing angle of converter with operated at inverter mode. The performance improvement of this proposed system by experiment, using a 20 kW four pole self excited synchronous generator. The overall control system is implemented on 12 pulse converter board. Experimental results are illustrated in order to validate performance of the proposed system.