Research on the evaluation method of capacity on electric-vehicle energy storage system

With accelerated rollout of plug-in electric vehicles (EVs), large-scale EVs could constitute an energy storage system, called electric-vehicle energy storage system (EVESS). It is essential to evaluate how much power can be exchanged between EVESS and the grid. Charging capacity (CLC) and discharging capacity (CLD) are defined as two major properties of EVESS in this paper. Then, evaluation models of CLC and CLD are proposed in a probabilistic manner. Based on the connecting probability of EVs, three different scenarios are developed to evaluate CLC and CLD. The results indicate that the EVESS is sensitive to the charging strategy and capable of providing certain amount of capacity for energy exchange with the grid which shows its potential of participating in vehicle-to-grid services.