考虑电压控制的含移动储能的主动配电网调度策略

针对主动配电网中分布式能源大量接入引起的电压越限,以及常规储能投资大、电动汽车调度困难等问题,提出一种考虑电压控制的含移动储能的主动配电网日前调度策略。将配电网与移动储能视作不同利益主体,建立双层优化模型。上层为配电网层,以网损最低为目标,根据预计的电压越限情况对下层发出调度;下层为移动储能运营层,以最大收益为目标优化移动储能充放电功率,响应上层调度,再由上层决定移动储能接入节点。在下层优化中考虑了移动储能荷电状态对其最大允许功率的影响;在配电网节点中设定充电节点与放电节点以减小移动储能接入对配电网网损的影响,并提出移动储能接入节点选择及转换策略。最后以IEEE 33节点系统为例进行分析,结果表明,所提调度策略可以在解决配电网节点电压越限、减小配电网网损的同时使移动储能盈利。

Active Distribution Network Dispatch Strategy with Movable Storage Considering Voltage Control

This paper proposes a day-ahead dispatch strategy for active distribution network with movable storage considering voltage control,responding to the voltage violation caused by large amount of distributed generation connection to active distribution network,as well as the big investment of energy storage and the difficulty of electric vehicles dispatching.We establish a bi-level optimal model with taking distribution network and movable storage as different benefit subjects.The upper layer is distribution network layer with the goal of the minimum line loss,instructing the lower layer according to the predicted voltage violation degree.The lower layer is movable storage operation layer which optimizes the charge/discharge power of movable storage with the goal of the maximum revenue,responds to the instructions of upper layer and return the results to upper layer to determine the access node of movable storage.In lower layer,we consider the effect of state of charge of movable storage on its maximum power available;set the charging node and discharge node in distribution network nodes to decrease the effect of movable storage on the line loss of distribution network,and then present a strategy of access node choice and change for movable storage.The simulation results of IEEE 33-nodes system show that the proposed strategy can solve the voltage violation,reduce line loss and could make movable storage profitable.