Control Location Selection Strategy for Power System Emergency Control

This paper analyzes the difficulties of emergency control and points out comparability of stability margin and transition of instability mode are the keys of emergency control. Then a revised normalized stability margin and a hidden mode identification method are proposed to solve these problems. Based on these work, an algorithm for control location selection is given. The cases of New-England system verified that the proposed algorithm can find the appropriate location for emergency control. It can work not only in same instability mode situation, but also in transferred instability mode situation.