Energy Storage Sizing Method Considering V2G Response Capability

Utilizing V2G technology, plug-in electric vehicles(PEVs) can behave as mobile energy storage units to participate in power grid operation. Based on the traffic behavior characteristics, the V2G response capability boundaries of PEVs considering time, energy and battery restraint is constructed. Then, the PEVs connected to the grid are divided into two types: responsive/non-responsive. Finally, the Monte Carlo method is used to establish the T-limit V2G response capability forecast models for individual PEV and PEV groups respectively. On the other side, the value-at-risk(VaR) method is introduced to energy storage capacity sizing, based on which, a reliability-at-risk(RaR) model is built to calculate the conventional storage capacity under a certain confidence level of power system reliability. Finally, the feasibility and effectiveness of the methods proposed above are proved in the examples.