考虑电动汽车集群时空能量可调控特性的交直流混合配电网紧急优化调度

Emergency optimal dispatch of AC/DC hybrid distribution network considering spatio-temporal energy controllable characteristics of electric vehicle clusters

针对交直流混合配电网存在强随机性分布式电源接入、电力电子变流器的过载能力受限的特点,提出了考虑电动汽车(EV)集群时空能量可调控特性的交直流混合配电网紧急优化调度方法。基于负荷在紧急状态下的响应特性差异建立紧急响应负荷模型,基于紧急优化调度的实际需要和EV集群中各单元的荷电状态、并离网状态差异性特点建立EV聚合商紧急调控模型;综合考虑调度单元的经济性与系统可靠性,建立紧急优化调度模型;基于改进的IEEE 33节点交直流混合配电网构建2种故障场景,基于最差净负荷功率曲线进行优化求解,并将EV集群与容量相当的传统储能的紧急优化调度结果进行对比,结果验证了所提方法的灵活性、有效性及经济优越性。

In view of the characteristics of AC/DC hybrid distribution network of the integration of strongly random distributed power sources and limited overload capacity of power electronic converters,an emergency optimal dispatch method of AC/DC hybrid distribution network considering the spatio-temporal energy con⁃trollable characteristics of electric vehicle(EV)clusters is proposed.The emergency response load model is established based on the difference of load response characteristics under emergency state,and the emer⁃gency control model of EV aggregator is established based on the actual demand of emergency optimal dispatch,together with the difference characteristics of each unit’s state of charge and the on-grid and offgrid states of each unit in the EV clusters.Comprehensively considering the economy and system reliability of dispatch unit,the emergency optimal dispatch model is established.Two fault scenarios are constructed based on the improved IEEE 33-bus AC/DC hybrid distribution network,and the optimal solution is per⁃formed based on the worst net load power curve.The emergency optimal dispatch results of EV clusters and traditional energy storage with equivalent capacity are compared to verify the flexibility,effectiveness and economic advantages of the proposed method.