In this paper a proportional investigation between Unified Power Flow Controller (UPFC) and Distributed Power
Flow Controller (DPFC) in a grid incorporated photovoltaic system is performed. A grid connected solar generation scheme with
boost converter and voltage source inverter (VSI) is taken as the key model. Due to power quality issues like power oscillations,
harmonic distortions, voltage sags and swells, the grid side system has to be absolutely monitored and restricted. One way to
mitigate these power quality troubles is by using reactive elements like shunt/series reactor and shunt/series capacitor. The
drawback on using these reactive elements is sub synchronous resonance phenomenon.
