Contribution allocation for voltage stability in deregulated power systems
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With deregulation of power systems, it is of great importance to know who contributes to avoid a voltage collapse, which could be due to different parts of the power system - generator, control system and transmission part, etc. This paper focused on how to allocate the responsibility and contribution by bifurcation analysis. We investigate how parameters of the system influence the bifurcation points. Three bifurcations (the singularity induced bifurcation, saddle-node and Hopf bifurcation and their relationship to several commonly used controllers are analyzed. Their parameters' impact on the bifurcation points is investigated in this paper, from which we found a way to allocate the contribution by analyzing the relative positions of the bifurcations. We also analyzed the influence of other parameters (parameters of transmission and generators) on the bifurcation points. A simple two-bus system is used in this paper to demonstrate our approach. Our result shows that bifurcation analysis is a credible way to allocate the contribution, and the analysis will help us design the controller and optimize the system to avoid the voltage collapse.
