Abstract: In view of the channel structure composed of a single risk-neutral grid corporation and a single risk-averse electric vehicle user,the reserved electricity decision model under the CVaR measurement criterion is proposed based on the reserve transaction involving V2G reserve and the popular contract price mechanism of "buying price floor protected,price fluctuation in line with market conditions" in practice. The optimal decision behaviors of the grid corporation and electric vehicle user in the decentralized and integrated decision are investigated successively. The research shows that the risk aversion characteristic of the electric vehicle user reduces the level of channel performance,and the traditional price mechanism of "buying price floor protected,price fluctuation in line with market conditions" cannot coordinate such V2G reserve channel well. On this basis,the perfect coordination of the cooperation system,as well as the Pareto improvement of both channel sides' profits can be achieved with the combined contract of "repurchase subsidy + market protective price + margin". The numerical analysis illustrates the basic characteristics of the above proposed models and methods.

Key words: V2G reserve, contract price mechanism, risk aversion, CVaR, optimization decision, coordination contract