Techno-economic comparative study of grid-connected PV power systems in five climate zones, China

Abstract The aim of this paper is to evaluate and compare the techno-economic performance of grid-connected photovoltaic (PV) power systems for a rooftop solar PV building containing 14 families in five climate zones in China. The techno-economic performance of grid-connected PV system in the five regions was evaluated using the HOMER software. Monthly average electric production, economic and environmental considerations, and sensitivity analyses were all considered. The results show that the pollutants from grid-only, grid/PV, and grid/PV/battery systems come mainly in the form of CO2 emissions. In addition, this study concludes that grid/PV systems are technically, economically and environmentally feasible for all five climate zones. The excess electricity, NPC, and COE values of the grid/PV systems for all five climate zones increased with PV penetration increased, whereas the CO2 emissions for these climate zones decreased due to the increasing PV sizes. For the grid/PV systems of five climate zones, Kunming is the most economical with the least NPC ($113,382) and COE ($0.073/kWh). The lowest CO2 (38,975 kg/yr), SO2 (35.4 kg/yr), and NOx (165 kg/yr) emissions of grid/PV systems occurred in Kunming. From an economic and environmental perspective, Kunming, with its mild climate conditions, may be especially suitable for grid/PV power generation.

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