Abstract—Integration of increasing penetration level of rooftop photovoltaic in the next few years may affect the quality of low voltage distribution system in Thailand. Harmonic current injected from rooftop PVs may cause harmonic problem and affect power quality of grid. Therefore, this research intends to study harmonic impact of rooftop photovoltaic penetration level on low voltage distribution system (400/230V) in urban area. DIgSILENT PowerFactory program is used to simulate and analyze the impact of rooftop PVs which connected in different penetration level and two scenarios of background system, such as balanced grid voltage, and polluted grid (with THDv). The result of simulated model shows that the total harmonic distortion voltage of the network is over the standard due to the amount of PVs with inverter (which has THDi<2%) connected to the system is more than 60% penetration of rated power of transformer. 
 

Index Terms—rooftop PV, distribution system, distributed generator, harmonics impact of rooftop PV

Cite: Orawan Poosri and Chalie Charoenlarpnopparut, "Harmonics Impact of Rooftop Photovoltaic Penetration Level on Low Voltage Distribution System," International Journal of Electronics and Electrical Engineering, Vol. 4, No. 3, pp. 221-225, June 2016. doi: 10.18178/ijeee.4.3.221-225