Research on order reduction of power system modeling for dynamic voltage stability analysis

Dynamic voltage stability analysis is mainly based on the time-domain solution of power system differential and algebraic equations. The modeling of each power element has a great influence on the correctness and complexity of stability analyzing. It is significant to model appropriately for simplifying calculation and drawing out principal contradiction. In this paper, the dynamical mechanism of voltage stability is summarized firstly. And based on the singular perturbation model taking into the fast and slow dynamics, this paper studies on how the quasi-steady-state model of power system approximates the dynamic of original system model. More, this paper employs the perturbation method and integral manifold theory as a tool for studying on the relationship of stability between the reduced-order system and original system. An important conclusion is reached that the power system quasi-steady-state model can be used for dynamic voltage stability analysis.