Improving the dynamic performance of a grid-connected wind energy conversion system using flywheel energy storage system

This paper presents the dynamic performance improvement of a wind energy conversion system (WECS) connected to a single machine infinite bus system using doubly-fed induction machine (DFIM)-based flywheel energy storage system (FESS). The continuously varying wind speed causes instabilities in the output power of the WECS. The use of FESS improves the dynamic response of the system and smoothes the output power of the WECS and during variable wind speeds. A DFIM-based FESS is proposed in this study which works on the cascaded black-box optimization technique based proportional-integral (PI) controller. The PI controllers are used to control the insulated gate bipolar transistor (IGBT) switches of the frequency converter. In-depth modeling and control strategy of the system under study is presented. The effectiveness of the proposed system is tested under real-time wind speed data. The validity of the system is verified by the simulation results which are carried out using PSCAD/EMTDC.