Dispatching outputs of generators for enhancing the power margins from the viewpoint of voltage stability

In a power system, there are many factors which contribute to the width of the power margins, generator outputs are an important one. In this paper, the effects and adjustment of generator outputs for enhancing the power margins (system robustness) to voltage stability are investigated. It is found that the power margins will vary according to different generator output, and they can be greatly improved by properly adjusting the generator´s outputs upon the load increase. So the concept of generator participation pattern is defined to reflect the dispatch of generator outputs upon system load increase, and an algorithm is proposed in this paper for fast determination of dispatch of generator outputs which enhances the power margins. The proposed method has been applied to several test systems and the simulation results in the Ward-Hale 6-bus system are presented