考虑负荷重要程度的配电网韧性提升策略及评估方法

Promotion strategy and evaluation method of distribution network resilience considering load importance

提出一种在极端天气灾害下考虑负荷重要程度的配电网韧性提升策略及评估方法,用于完善在小概率、高风险的极端天气灾害发生后的配电网韧性提升策略及评估体系。首先,以台风作为极端天气灾害代表事件,根据台风模型和架空线路故障概率模型确定线路故障概率;其次,建立三阶段韧性提升联合优化策略模型,根据线路故障概率确定韧性提升联合优化策略、故障线路以及最小切负荷率;然后,提出考虑负荷重要程度的电网韧性评估方法,根据韧性提升策略下各节点切负荷率和负荷重要程度来评估配电网韧性;最后,通过IEEE 33节点系统进行仿真,对比单种韧性提升措施与多种措施联合优化的韧性提升效果,验证所提韧性提升策略及评估方法的有效性与优越性。

A strategy and evaluation method for enhancing the resilience of distribution networks,which considers load importance under extreme weather disasters,is proposed to improve the resilience enhancement strategy and evaluation system of distribution networks after the occurrence of small-probability,high-risk extreme weather disasters.Firstly,taking typhoon weather as a representative event of extreme weather disasters,the line failure probability is determined based on the typhoon weather model and the failure probability model of overhead lines.Secondly,a three-stage joint optimization strategy model for resilience enhancement is established to determine the joint optimization strategy for resilience enhancement,the faulty lines,and the minimum load shedding rate based on the line failure probability.Then,a resilience evaluation method considering load importance is proposed to assess the resilience of distribution networks based on the load shedding rate and load importance of each node under the resilience enhancement strategy.Finally,simulations are conducted using the IEEE 33-node system to compare the resilience enhancement effects of single resilience enhancement measure with those of joint optimization of multiple measures,verifying the effectiveness and superiority of the proposed resilience enhancement strategy and evaluation method.