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On-line detection of power system small disturbance voltage instability

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2 Author(s)
Liancheng Wang ; Dept. of Electr. & Comput. Eng., Clemson Univ., SC, USA ; A. A. Girgis

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 stability 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 identification, respectively. The Q angle index can handle different kinds of loads, e.g., constant P and Q, constant impedance, and constant current, or a combination of them, and is effective in dealing with generator VAr limits. Moreover, the computation speed of the Q angle is fast, which makes it suitable for on-line application. Simulation results using two power systems are provided

Published in:

IEEE Transactions on Power Systems  (Volume:11 ,  Issue: 3 )