A future building energy system is established with photovoltaic (PV) generation and hybrid storage system in a case in Hong Kong. The battery, electric vehicle (EV) and pump-hydro storage (PHS) system are considered. A technical feasibility study is conducted to assess the influence of different storage priorities. The PHS is shown to reduces the total energy efficiency by 7.16% at user side. The low self-sufficiency rate, 16.29% to 17.77% recommends the addition of remote renewable generation. The low usage rate of storage system, 31 to 58, annual equivalent battery cycle number emphasizes the need of grid charging.
Keywords Renewable energy resources, hybrid energy system, operation strategy, battery, electric vehicle, pump hydro storage