A discontinuous coordinated charging strategy for electric vehicles

At present, the capacity of most residential areas cannot meet the need of large-scale EVs (Electric Vehicles) charging. A strategy of coordinated charging for private EVs in residential area is proposed. Based on daily trip habit of EV and base loads of residential area, the method seeks for the period of the lowest total loads and arranges EVs for discontinuous coordinated charging in the valley period that makes sure the total loads are flat as soon as possible. The daily trip rule of EV user is simulated by Monte Carlo method, and the load condition of distribution transformer under three charging modes, namely the uncoordinated charging, the continuous coordinated charging and the discontinuous coordinated charging, are simulated and analyzed. Research results show that the discontinuous coordinated charging can reduce peak-valley ratio significantly and cannot cause new peak load, thus it is suitable for practical application.