Power Quality Improvement in Hybrid Energy Conversion Systems

Grid integration of photo voltaic (PV)/Battery hybrid energy conversion system with multi-functional features of micro grid-side bidirectional voltage source converter, tight voltage regulation capability of battery converter and MPPT tracking performance of high gain integrated cascaded boost (HGICB) dc-dc Converter with quadratic gain and less current ripple are presented in this paper. The PV side HGICB Converter is controlled by P&O MPPT algorithm to extract the maximum power from the variable solar irradiation. Some applications with following intelligent functionalities are developed (a) to feed the generated active power in proportional to irradiation levels into the grid (b) compensation of the reactive power, (c) load balancing and (d) mitigation of current harmonics generated by non-linear loads, if any, at the point of common coupling (PCC), thus enabling the grid to supply only sinusoidal current at unity power factor. The battery energy storage system (BESS) is regulated to balance the power between PV generation and utility grid. The dynamic performance of battery converter is investigated and compared with conventional average current mode control (ACMC).