Abstract:
This thesis presents an analysis of performance degradation between PV rooftop and PV on ground power plant with a capacity of 1MW. Both PV power plants used the same manufacturer polycrystalline PV module connected to a 1MW grid inverter and located in the same location in Samutsongkhram province, Thailand.
The actual monitored data was collected in the years 2017 and 2018 and the PVsyst simulation program was used. The analysis covered all parameters impacting the performance ratio (PR) such as temperature, humidity, weather, and local geography. Performance ratio (PR) was used as an indicator for degradation factors (DF) of both power plants. Maximum power coefficient was considered when the temperature changed based on standard temperature (STC) obtained in 2017 and 2018. Therefore, the degradation factor (DF) was calculated to evaluate the performance of both PV power plants.
The analysis results of degradation factors (DF) of PV rooftop and PV on ground in the years 2017 and 2018 were 0.62% and 0.42%, respectively. The DF of PV on ground was less than PV rooftop as 0.2%. From PVsyst simulation results, the PR of PV rooftop and PV on ground were 75.6%, and 83.2%, respectively. The average PR from the actual monitored data of the two years for PV rooftop and PV on ground were 77.20% and 83.04%, respectively. The PR values from PVsyst simulation program and the actual monitored data were in the same direction.