Space Vector Modulated Voltage Source Converter for Stand Alone Wind Energy Conversion System

Abstract This paper proposes a voltage and frequency controller for a wind turbine-driven independent asynchronous generator. The proposed controller consists of IGBT (Insulated Gate Bipolar Transistor) based three phase voltage source converter along with battery energy storage system at its DC bus and it inherently adapts to the changes in the rotor speed while maintaining a near constant voltage and frequency at the load terminals. The controller is having bidirectional flow capability of active and reactive powers by which it controls the system voltage and frequency with varying wind speed and load conditions. Among various modulation strategies, Space vector pulse width modulation technique is used in the controller, because it increases the fundamental output voltage. Also they allow reducing commutation losses and the harmonic content of the output voltage, and to obtain higher amplitude modulation indexes. The proposed space vector modulated voltage source converter is modeled and simulated in MATLAB using Simulink and PSB (Power System Block-set) toolboxes.