Normalized Subband Based Control Framework for Renewable DER Integrated at Common AC Bus Microgrid with Multi-Mode Functionality

In this paper, an AC microgrid incorporating wind energy and solar photovoltaic (PV) energy with adaptive controller is presented with multi-mode operating capability. Solar PV array and wind energy conversion system supply power to AC bus of the microgrid via independent parallel voltage source converters. This proposed microgrid is capable of operating in three different modes, which serves the purpose (a) uninterrupted power to consumer loads, (b) operation of DE Genset only during an emergency, while reducing its overall working hours, and (c) mitigation of power quality issues due to unusual scenarios. Unified sparsity aware robust normalized subband adaptive filtering approach is used to mitigate the adverse effects related to quality of power due to consumer loads connected at common AC bus of the microgrid. Brushless direct current machine is used as a wind generating unit because it is independent of voltage and frequency fluctuations at AC bus unlike other conventional AC generators. To check effectiveness and robustness of microgrid system and control techniques, the rigorous simulations are carried out for different operating conditions in Simulink Matlab platform and verified through obtained results.