IRPT based control of a 50 kw grid interfaced solar photovoltaic power generating system with power quality improvement

This paper deals with a modified instantaneous reactive power theory (IRPT) based control of a grid interfaced solar photovoltaic (SPV) power generation which also mitigates power quality problems in three-phase four wire (3P4W) distribution system. This is a double stage SPV power generating system which accommodates wide varying input voltage. The proposed grid interfaced SPV generating system consists of a PV array, a DC-DC boost converter, a three leg VSC (Voltage Source Converter), an isolated Y-Δ transformer, a grid and connected linear/nonlinear loads. The DC bus voltage of a three-phase VSC is regulated using a PI (Proportional Integral) voltage controller. The SPV energy is injected in to the DC bus of VSC during sunshine hours. The proposed SPV power generating system provides the zero voltage regulation (ZVR) or power factor correction (PFC) along with harmonics elimination, load balancing and neutral current compensation in 3P4W distribution system. MATLAB/Simulink based simulation results are presented to validate the design and control of SPV power generating system for feeding 3P4W loads with improved power quality.