Study on power system self-adaptive islanding

Self-adaptive system islanding is a new research direction in the field of islanding control. The sub problems and framework of self-adaptive islanding were studied in this paper. The research contents are as follow. First, the traditional out-of-step islanding schemes is introduced and simulated. The simulation results show some defects of traditional islanding. These defects indicate the necessary of self-adaptive islanding researching. Second, an instability mode detection scheme based on out-of-step relays and WAMS is studied and presented. Simulations on IEEE 118-bus power system show the proposed method is effective. Third, a novel and fast islanding boundary searching method was presented. The aim of this method was that the generation load imbalance in each island be as small as possible. A C++ program was developed based on the method. Simulations on IEEE 118-bus power system show the proposed method is effective and fast. Finally, based on the research content mentioned above, the framework of islanding control system was designed. The demand of each part of the system was analyzed, and the flowchart of islanding control system is discussed.