Hierarchical coordinated control strategy for electric vehicle based on bi-level programming

Uncontrolled charging behaviors of electric vehicle may have negative impacts on the operation of the power system. To avoid this, a hierarchical coordinated control strategy based on bi-level programming is proposed. The upper-level is devoted to minimize the operational cost of several aggregators and the system load variance. On the lower level, each aggregator controls the charging/discharging behaviors of EVs to meet the dispatch scheme determined by the upper decision-maker. An iterative genetic algorithm is employed to solve the problem. Finally, a test system including 3 aggregators is employed to demonstrate the performance of the approach proposed.