Load Harmonics Compensation in Autonomous DFIG Based Wind Turbine Systems

Abstract

Load harmonics compensation of a DFIG based wind energy system is proposed in this paper. The control of voltage and frequency of a variable speed-constant frequency autonomous DFIG based wind energy system is done through an active filter technique. To overcome such type of problem two back to back connected thyristor based Voltage Source Converters (VSC) are used with a DC energy storage system connected at dc link between these two converters. This paper contain a wind energy system with grid-connected doubly fed induction generator (DFIG) are considered. At the stator terminals after regulating the voltage and frequency, the generated error signal between the actual rotor current and the reference rotor a current is pass through hysteresis controller. This generated stator voltage is controlled through rotor current. Amplitude of stator voltage and its frequency are controlled independently. For the diminution of generated harmonics in current and voltage, active filtering and voltage control techniques are used. The presented methodology is applicable for 2MVA DFIG based wind turbine prototype. This proposed model is designed in MATLAB/Simulink and results procured from it are represented and discussed in this paper.