A TPFW Solar PV-BSS-DG set Based Microgrid with Power Quality Improvement and Maximum Power Extraction Capability

In this paper, a three-phase four-wire (TPFW) standalone microgrid is presented for powering the electrical energy to the rural areas where the electric grid is not available. This microgrid is designed with a synchronous generator (SG) based diesel generator (DG) set, a photovoltaic (PV) array and a battery storage system (BSS). The BSS handles the intermittent variation of the PV array power as well as provides power to the load during the heavy load demand. The DG set feeds power to the nonlinear and unbalanced loads. Hence the voltage source converter (VSC) is controlled in such a manner that it provides the harmonics, reactive power as well as the compensation of unbalanced load. Thereby the power quality (PQ) at the DG set is improved. The main functional features of the microgrid, are extraction of maximum PV array output power, DG set terminal voltage regulation, unity power factor (UPF) operation of the DG set by compensating the reactive power, harmonics elimination, compensation of the unbalanced load and neutral current compensation etc.