Voltage Imbalance Mitigation using SOGI based PV-DVR System

Due to the increase of nonlinear loads in recent years, power quality issues have attracted more attention. One of the major power quality problems is an imbalance in grid voltages. The existing control strategy involving conventional phase lock loop (PLL) for photovoltaic based dynamic voltage restorer (PV-DVR) can mitigate voltage sag/swell but fails in grid voltage imbalance conditions. This issue can be overcome by adopting second order generalized integrator (SOGI) based reference voltage algorithm. This work has been carried out to demonstrate SOGI based PV-DVR system for mitigating imbalance in gird voltages. The algorithm has been tested under different scenarios, which includes normal grid conditions and voltage imbalance during day and night time. The simulation studies conducted in MATLAB/Simulink proves the effectiveness of SOGI based PV-DVR.