Economy Optimization-Based Power Distribution Scheme for Multiple Dual-Active-Bridge Converters in DC Charging Stations

The increasing number of electric vehicles (EVs) leads to a great development of DC charging stations. With the advantages of bi-directional power flow and electrical isolation, dual active bridge (DAB) has been applied for EV charging. For the multi-DAB system, a robust power optimization scheme needs to be implemented in a DC charging station. In this article, an economy optimization-based power distribution scheme is introduced, which helps to reduce the cost and ensure the safety operation of DABs. The method is implemented by using economy modeling, Lagrange Multiplier, and proportional-integral (PI) controller. Both simulations and experiments validate the cost-reduction and dynamic performance of the proposed scheme.