Patent ID: 9573477
Date: 2017-02-21
CPC Classifications: B60L,Y02E,Y02T,Y04S

Claim:
1. A method for charging an electric vehicle in a power system, comprising: obtaining a plurality of electric vehicles connected to the power system at a dispatching time, and obtaining a rated charging power and a charging requirement at the dispatching time of each electric vehicle respectively; determining a charging period corresponding to the plurality of electric vehicles; determining a forecast period, and obtaining a charging requirement, a remaining charging energy capacity and a maximum charging power at each charging time in the forecast period corresponding to a set of electric vehicles to be connected to the power system in the forecast period; establishing a charging model of the plurality of electric vehicles, establishing a first constraint of the charging model according to the rated charging power and the charging requirement of each electric vehicle at the dispatching time, and establishing a second constraint of the charging model according to the charging requirement, the remaining charging energy capacity and the maximum charging power of the set at each charging time in the forecast period; and solving the charging model under the first constraint and the second constraint to obtain an optimal charging power of each electric vehicle at each charging time in the charging period, and sending the optimal charging power at the dispatching time to each electric vehicle so as to charge each electric vehicle under the optimal charging power, wherein the charging model is expressed according to formula (1), where t represents the dispatching time, M t represents a plurality of electric vehicles, n represents the n th electric vehicle, r p represents the charging requirement of the set in the forecast period, r n represents the optimal charging power of the n th electric vehicle, k represents the k th charging time, r n (k) represents the optimal charging power of the n th electric vehicle at the k th charging time, D 0 (k) represents a conventional load power at the k th charging time of the power system, r p (k) represents the charging requirement of the set at the k th charging time, Ω t represents the charging period, T t p represents the forecast period, r n max represents the rated charging power of the n th electric vehicle, R n t represents the charging requirement of the n th electric vehicle at the k th charging time, Δt represents an interval between two charges, {circumflex over (r)} p (k) represents the maximum charging power of the set at the k th charging time, {circumflex over (R)} p (k) represents the remaining charging energy capacity of the set at the k th charging time, {circumflex over (R)} D p (k) represents the maximum charging power of the set at the k th charging time.