Parallel Operation of Permanent Magnet Generators in Autonomous Wind Energy Conversion System

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 maximum 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 performance of the proposed AWEC system is presented to demonstrate its capability of MPT, control of load voltage magnitude and frequency, harmonic elimination, and load balancing.