A Novel Approach to Evaluating Small-Disturbance Voltage Stability of Large Scale AC/DC Power Systems

摘要

Considering generator dynamics, load dynmaics and HVDC dynamics, the differential and algebraic equations for analyzing small-disturbance voltage stability of large scale AC/DC power systems are established and a new voltage stability criterion is presented based on some reasonable assumptions and regorous mathematical derivation. The criterion is that the determinants of two different power flow Jacobian matrices should have same signs. By using the criterion, the dynamic problem of power system smalldisturbance voltage stability can be treated as a static problem, so the eigenvalue analysis is avoided and computation burden is reduced. The calculation results on two sample systems show that the novel approach proposed in this paper is correct and feasible.