ONLINE DETECTION OF POWER-SYSTEM SMALL DISTURBANCE VOLTAGE INSTABILITY

Small disturbance (SD) voltage stability (or instability) deals with a system's ability to maintain satisfactory voltages following a small disturbance. For an operating condition, a system's SD voltage stabili ty depends on the proximity of the condition to the critical point (or voltage collapse point). A Q angle and Q directional derivatives are proposed for SD voltage instability detection and weak bus identificat ion, respectively. The Q angle index can handle different kinds of loa ds, e.g., constant P and Q, constant impedance, and constant current, or a combination of them, and is effective in dealing with generator V ar limits. Moreover, the computation speed of the Q angle is fast, whi ch makes it suitable for on-line application, Simulation results using two power systems are provided.