Comparative Analysis of Solid State Transformer and Conventional Transformer for Doubly Fed Induction Generator fed Wind Energy Conversion System

Abstract

Rise in population and over use of conventional energy sources have followed by several environmental problems. These problems have resulted in the uprising of new technologies of Distributed Energy Resources (DER) like Photo-Voltaic, Biomass, Hydroelectric power, Wind energy system on abundant scale. Wind Energy Conversion (WEC) system is one of the rapidly uprising technique to use renewable energy resource. Integration of these WEC systems into the main power grid is done with the help of conventional line frequency step-up transformer which plays a crucial role. Nowadays, several efforts have been taken to use power electronics based Solid State Transformers (SST) instead of conventional line frequency transformers. The concept of SST interfaced Doubly Fed Induction Generator (DFIG) based WEC system is exhibited and simulated using MATLAB/ Simulink in this paper. Installation of SST in place of conventional line frequency transformer in WEC systems has certain advantages like: reactive power compensation, smooth voltage conversion, active power transfer, etc. A Simulink model of SST interfaced DFIG fed WEC system and conventional line frequency transformer interfaced DFIG fed WEC system is developed to show PCC voltage comparison for both the system.