A techno-economic sizing method for PV/battery/grid hybrid solar systems for residential buildings

다국어 초록 (Multilingual Abstract)

The increasing share of the distributed renewable energy in power generation is an important development direction in the electrical power system. However, its intermittent and nonprogrammable nature is a major challenge. Battery storage is providing an effective solution to solve these issues. In the paper, the PV/battery/grid (PVBG) system is established for residential buildings, and the optimal combination of PV size and battery size was obtained by techno-economic analysis. Firstly, self-sufficiency ratio (SSR) and self-consumption ratio (SCR) as the technical indicators were applied to evaluate and analyze the performance of different PV/battery/grid systems. Secondly, the levelized cost of energy (LCOE) as an important economic indicator was applied to optimize PVBG system configuration by using the particle swarm optimization (PSO) technique. PVBG systems were simulated under the actual electricity price and feed-in-tariff of a typical power market. Lastly, the optimal PV and battery system combination was obtained by maximizing SCR and SSR and minimizing LCOE. The results showed that integrating battery energy storage can improve SCR and SSR. The PVBG systems with a higher SSR resulted in more PV production to sell back to the grid and reduced the usage rate of the battery. Eight cases with different technical indicators were compared and discussed. The results showed that the LCOE of the PVBG system ranged from 0.351 to 0.769 RMB/kWh for the residential building studied. According to the technical and economic indicators, the optimal sizes of PV and battery were respectively determined to be 6696 Wp and 2366 Wh for the case studied.

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