Volume 15: Low Carbon Cities and Urban Energy Systems: Part IV

Optimizing the configuration of the Battery Energy Storage System in Microgrid Considering orderly and non-orderly EV charging Ruifei Ma, Jingchao Liu, Peng Wu, Yelin Deng

Abstract

As energy issues become serious, the utilization of distributed energy resources in microgrid has become the most popular choice. At the same time, electric vehicles are growing fast and have been recognized as the most promising direction. However, the uncertainty of power generation and EVs charge/discharge will cause power grid fluctuation, which in further increases the control load. Under this circumstance, battery energy storage system is considered as the most effective way to overcome the instability and alleviate energy crisis. This paper evaluates the battery energy storage system optimal configuration in a residential area involving electric vehicles based on cost analysis includes the basic structure of MG and the model of electric vehicles. The BESS investment cost, environmental value and EVs subsidy are taken into account in cost analysis part. The Battery Performance and Cost model is used for the bottom-up design and calculation for unit capacity costs with different levels of rated capacity. The results in the case study show the system rated capacity and power decrease greatly when electric vehicles participate in frequency control with economical energy management strategy. And the using of Battery Performance and Cost could make the result more accurate, which benefits from unit cost changing value. Finally, the most optimal configuration is given by balancing the effect of the microgrid frequency control and the total daily cost.

Keywords Battery Energy Storage System (BESS), Electric Vehicles (EVs), Optimal Configuration, Cost Analysis.