Fast service restoration of distribution system with distributed generations

Abstract

A fast, effective service restoration method is designed for distribution systems with the high penetration of distributed generation (DG), which is formulated as a constrained multi-objectives optimization problem. This paper regards the nodes connected with DG as the power source nodes which are encoded by the depth encoding technology, then searches the islands which include DGs, and establishes islanding scheme after the failure of distribution system. On this basis, the island transition load indexes are established, and are used to evaluate the reserve capacity of distribution networks with DGs. Those island transition load indexes combined with the index of the reserve capacity of tie switches are optimizated to indicate an optimal path to restore service for non-fault areas according to heuristic rules. One target is that DG and tie switches are fully used to restore all the loads and minimize the number of required switch operations as few as possible. Finally, the example of IEEE-69 indicates that this algorithm not only fully uses DGs to improve the reliability of power supply, but also greatly narrows the search space and reduces the search time of optimization. This method is mainly applied to service restoration in the distribution network with DGs for real-time operation.