Coordinated Islanding Partition and Scheduling Strategy for Service Restoration of Active Distribution Networks Considering Minimum Sustainable Duration
Lei Sun, Han Wang, Zhenghui Huang, Fushuan Wen, Ming Ding
Abstract
This paper presents a coordinated islanding partition and scheduling strategy for service restoration of active distribution networks (ADNs) to maximize weighted restored energy considering the minimum sustainable duration (MSD) of controllable islands (CIs). To avoid the forming of uncontrollable islands, the concept of dominated buses is proposed and integrated into the topological model of ADNs for islanding partition. The co-optimization of mobile distributed generator (MDG) dispatch and dominated bus identification is carried out to accelerate the restoration process. The MSD of CIs is explicitly modeled, and the CIs are scheduled in a risk-adjusted way, whose conservatism can be adjusted by controlling the predefined risk confidence level. Interruptible loads are considered as flexible resources in the islanding partition strategy considering the effects of the MSD of CIs. To improve the practicability of the presented method, time-varying power demands and distributed renewable generation outputs are incorporated into the presented framework. The studied problem is formulated as a mixed-integer second-order cone programming model, which can be efficiently solved by commercial solvers. Finally, a modified version of the Pacific Gas and Electric Company 69-bus distribution system, a practical medium-voltage distribution system in Denmark, and a modified IEEE 123-bus distribution system are employed to demonstrate the performance of the developed model.