Design and Development of Effective Power Transfer and Intelligent Fault Ride through Control Strategies for the Grid Connected Dfig Based Wind Energy Conversion Systems

Abstract

Wind turbine generators must stay connected to the utility grid satisfying grid code standards of countries and dynamically contribute to system stability during grid faults. The significant issue which is addressed in the wind integrated grid system is improving the capability of Fault Ride Through (FRT). In this work, a suitable control algorithm is developed for Doubly Fed Induction Generator (DFIG) based grid integrated WECS under different conditions namely normal, fault and the overall performance of system is examined. During the normal mode of operation, Fuzzy-TSR based Wind Speed Estimation (WSE) is implemented in the Rotor Side Converter (RSC) to obtain maximum power transmission from the WECS. The reference current generation method is employed in the Grid Side Converter (GSC) using the Instantaneous Power Theory (IPT) technique to obtain smooth and effective bidirectional power transfer bidirectional way meeting the required demands. newlineIn addition, the power transfer under the conditions like underloading, overloading, and shorting the stator condition after the implementation of the proposed controllers is investigated. The hybrid fault ride through control schemes like Crow Bar Resistance (CBR) with RL Circuit, DC chopper with CBR, DC Chopper with Series Dynamic Resistor, Voltage Control Scheme with Crowbar Resistance are developed and studied under system fault conditions. To overcome the drawbacks of hardware based FRT and hybrid based FRT strategies, intelligent FRT control strategies are proposed and system parameters during symmetrical and unsymmetrical faults are analyzed newline