Design, Control, and Simulation of a Novel Power Conversion System

This paper investigates a novel high frequency power conversion system to harness clean energy from distributed resources. A generalized link involving multi-stage power conversion is investigated for a wind energy system, wherein a three-phase source with variations in voltage and frequency is considered. The first intermediate stage of the link uses a quasi-square wave DC-AC inverter operating at 20 kHz. A transformer is fed from the high frequency quasi-square wave inverter to maintain power handling capability to the level of a 60Hz transformer and reduce the size and cost of the transformer and passive elements. A feed forward and feedback based multi-loop control system is used to regulate output voltage irrespective of variations in supply voltage and frequency. Detailed mathematical model of the entire system is provided. Simulation results are given to establish the idea of high frequency energy conversion link for distributed sources and a variety of loads