基于网络简化拓扑预计算的互联配电网分布式供电恢复策略OA

[Objective]In response to the risk of power outage in a single distribution network caused by main transformer fault,this paper proposes a distributed service restoration strategy for interconnected ADNs based on network simplification and topology precomputation.[Methods]First,this paper proposes a partitioning-based simplified modeling method for distribution networks based on boundary measurement data,and establishes a simplified network topology precomputation model that incorporates the tie line and feeder switches to predetermine the optimal states of tie line switches.Second,this paper constructs a global service restoration optimization model of interconnected distribution networks and proposes a distributed service restoration method based on the improved generalized Benders decomposition algorithm.The global optimization model is decomposed into main problem and sub-problem and then solved iteratively between the power outage and normal distribution networks to determine the optimal scheme of other controllable resources.Finally,simulation verification is conducted using two case studies of interconnected distribution networks of different sizes.[Results]In the two-interconnected and three-interconnected distribution network cases,the proposed distributed method converged in 12 and 17 iterations,respectively,achieving a 100%load restoration rate in both outaged networks.Compared with the centralized optimization method,the deviation rates of the global objective function value were approximately 0.1%and 0.02%,respectively.In the three-interconnected case,the computation time of the proposed method was 31.51s,which is significantly lower than the 575.32s of the centralized optimization method.[Conclusions]The proposed simplified topology precomputation method can accurately construct the simplified topology model of interconnected distribution networks and determine the optimal states of both internal and inter-network tie-line switches.When the scale of the interconnected distribution network increases,the distributed service restoration strategy based on the improved generalized Benders decomposition can still converge effectively and obtain a near-optimal restoration scheme that is essentially consistent with that of the centralized optimization method,thereby verifying the effectiveness and accuracy of the proposed method.