| dc.description.abstract | With the rising of environmental awareness, the energy saving and carbon reduction are the focus of global industrial development today. In order to improve the problem of carbon dioxide emissions of automobiles, electric vehicles and other related technologies have been gradually developed. Owing to the promotion of policies of many countries, electric vehicles will become the direction of future development. Moreover, due to the variation of the illumination and temperature, the intermittent characteristics of a photovoltaic (PV) power system will cause negative impacts on power systems. This thesis proposes an energy management system (EMS) for the electric vehicle charging stations with PV power system and battery energy storage system (BESS). By controlling the input and output power of the BESS, the goal of improving energy efficiency and reducing the operating cost of the electric vehicle charging stations can be achieved. Furthermore, the EMS uses AAEON′s embedded computer BOXER-6641 as the host in Fortune Electric EVALUE electric vehicle charging station, which collects power information of the charging station and uploads it to the cloud. This thesis first introduces the hardware architecture of the electric vehicle charging station and the specifications of the electric vehicle charging plug, and then introduces the communication architecture and various modes of the EMS in detail. In the automatic frequency control (AFC) mode, the output power of the BESS is controlled according to the dReg and sReg dispatch curves to stabilize the frequency of grid. In the contract capacity mode, the BESS is used to compensate for the load power without exceeding the contract capacity. In the real time pricing mode, when the electricity price is high, the BESS is charged, and when the electricity price is high, the BESS is discharged. Finally, various simulation and experimental results are given to verify the effectiveness of the proposed EMS for the electric vehicle charging stations. | en_US |