The invention discloses a large-scale
electric vehicle optimized charging and discharging
system and method based on the optimal
power flow. The method comprises the steps that a
power grid dispatching center enables each
cell centralized management unit to be equivalent to a storage battery, the
cell centralized management units are brought into unified dispatching of a
power grid, an optimization model is built by using a smooth daily load curve, the minimum
transmission loss, the minimum number of regulation times of on-load
voltage regulating transformers and the highest
user satisfaction degree as objective functions and by being restrained and regulated by
power grid safe and stable operation behaviors, the charging capacity of each
cell centralized management unit is obtained by using the improved
particle swarm optimization algorithm, and each cell centralized
management unit is used for formulating a charging and discharging plane for each vehicle according to different requirements of electric vehicles. By means of the large-scale
electric vehicle optimized charging and discharging
system and method, various problems caused because a large number of electric vehicles have access to the power grid to be charged and discharged can be solved, charging and discharging of the electric vehicles are completed in sequence, the requirement of users for
electricity consumption can be met, and meanwhile
operation safety and economical efficiency of the power grid are improved by making full use of the electric vehicles.