Parallel operation of permanent magnet generators in autonomous wind energy conversion system

Abstract

This paper deals with a new Autonomous Wind Energy Conversion System (AWECS) employing parallel operated Permanent Magnet Synchronous Generators (PMSGs) driven by variable speed wind turbines and feeding three-phase four-wire local loads. The proposed system utilizes three Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source converters (VSCs) with a battery energy storage system (BESS) at their dc link. The system utilizes two separate machine side converters one for each PMSG for maxi-mum power tracking (MPT) through their rotor speed control. However a common dc bus, a battery bank, and a common load side converter are used for voltage and frequency control (VFC) at the load terminals. The proposed electro-mechanical system using PMSGs, MPT controllers and a voltage and frequency con-troller (VFC) are modeled and simulated in MATLAB using Si-mulink and Sim Power System (SPS) set toolboxes. The perfor-mance of the proposed AWEC system is presented to dem-onstrate its capability of MPT, control of load voltage magnitude and frequency, harmonic elimination, and load balancing.