Abstract
With the massive access of distributed generation (DG) and energy storage (ES), the distribution network (DN) can continue to supply power to important loads through island partition after losing the superior power supply, so as to improve the reliability of the system. However, due to the need to consider the sequential characteristics of ES, radial operation constraints of DN, secondary outage constraints of load and load priority, island partition is a complex NP hard problem. Therefore, an active DN island partition method of DN with ES based on genetic algorithm is proposed in the paper, which is characterized by incorporating radial constraints into the island partition model, selecting island benefit as the objective function. The repeated iterative calculation of genetic algorithm can ensure that the solution is better and has high versatility, which is a better solving method for the complex island partition problem. In addition, the sequence characteristics of ES, DN interconnection switch and secondary outage constraint are both considered in the island partition model at the same time. Finally, a case study for the improved PG&E 69-bus system is carried out based on genetic algorithm, which proves that the proposed method can finally solve island problem efficiently and get a great island partition scheme.
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