Voltage control strategies for grid-connected solar PV systems

The installation of rooftop PV system has beengrowing rapidly in Thailand. The active and reactive power feed-in by grid-connected solar PV systems will result in voltage rise over its maximum limit in distribution systems. This paper proposes different voltage control strategies to limit the voltage rise in low voltage distribution systems caused by grid connected solar PV systems. The voltage control strategies include four different active and reactive power control strategies. The simulation results on the feeder number ninth of Bang Pa Han substation in PEA Central Area 1 Ayutthaya´s distribution system demonstrate the reduction of voltage at point of common coupling of grid connected solar PV system. Finally, technical comparisons of different control strategies are made.