The results provide a reference for policymakers and charging facility operators. In this study, an evaluation framework for retrofitting traditional electric vehicle charging stations (EVCSs) into photovoltaic-energy storage-integrated charging stations (PV-ES-I CSs) to improve green and low-carbon energy supply systems is proposed.
At the same time, the peak shaving and valley filling benefits brought to the grid by energy storage systems should also be included within the scope of charging infrastructure subsidies. The energy yield and environmental benefits of clean electricity are crucial for the promotion of PV-ES-I CS systems in urban residential areas.
In addition, the tiered electricity pricing for EV charging at this public charging facility is as follows: spike period at 1.48 CNY/kWh (20:00–22:00), peak period at 1.27 CNY/kWh (9:00–15:00), flat period at 0.98 CNY/kWh (7:00–9:00, 15:00–20:00, and 22:00–23:00), and valley period at 0.62 CNY/kWh (23:00–7:00 the next day).
The simulation results also confirmed that due to the shading caused by high-rise buildings, the irradiance loss of the PV-ES-I CS system resulted in an energy production of only 15.39 MWh/year, and a reduction of only 183.9 tons of CO 2 emissions over the entire lifecycle.
By using PVsyst 6.70 software for simulation, the predicted electricity generation of the PV-ES-I CS system can be obtained, as shown in Table 2 and Fig. 8 A. Since the installed capacity of the preset PV-ES-I CS system is 21.78 kW, it consists of 36 monocrystalline silicon PV modules of JAM78S30-605/MR model.
Obviously, high-rise residential communities with high plot ratios and high building coverage will have a significant negative impact on the power generation efficiency of PV systems.
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