Abstract
This paper presents the impact of on-grid solar PV rooftop on local power systems of 10 kW - typical low voltage power rating for households campaigned by Thai Government. The overvoltage, frequency variation and harmonic contamination was investigated and analyzed. The condition of peak power generated from PV was also considered. The experimental data used for the analysis were collected by turning on and off the solar PV system of PEA power system on Udonthani province, Thailand for every hour with duration time between 6.00 AM and 6.00 PM. The results showed that the voltage at the connecting point of solar PV rooftop to the grid increases from 5-8 V (2.3-3.6%.).The frequency slightly increases from 49.97-50.06 Hz. In addition, the total harmonic distortion is not significantly different - varying in narrow range of 0.1-0.2 VTHD.
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