Performance Analysis of DSTATCOM with High Solar PV Penetration for Distribution System

Abstract: The scope of grid-connected photovoltaic (PV) power system installations has grown increased rapidly. According to Ministry of New and Renewable Energy (MNRE) reports the solar capacity of India is increased 370 % in the last 3 years from around 2.6 GW more than 12.2 GW. Large penetration of PV in a microgrid connected distribution system impacts the weak utility distribution system by creating various power quality (PQ) problems such as voltage sag or swell, unbalance, harmonics and DC current injection etc. These power quality (PQ) issues and they are broadly classified as current related PQ issues and voltage related PQ issues. When number of solar PVs are connected at the end of long and lightly loaded distribution system, there occur inconstancy in PV generation, so there will be a large voltage variation. A multiple functions of DSTATCOM is thus achieved by operating the device so as to mitigate the current and voltage related PQ issues. Thus a multi-functional control strategy allow DSTATCOM to compensate voltage and current related PQ problems. This project presents a hybrid DSTATCOM which can be used in highly PV penetrated distribution system to control the voltage and current related PQ issues. The topology uses a suitably designed foreign inductor, connectedbetween the grid and load.

Keywords: PQ, Penetration, Solar PV, D-STATCOM,etc.