On-line detection of power system small disturbance voltage instability

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · IEEE Transactions on Power Systems

DOI:https://doi.org/10.1109/59.535671· OSTI ID:390008

Wang, L; Girgis, A A ^[1]

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1. Clemson Univ., SC (United States)

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 of 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.

• Sponsoring Organization: USDOE
• OSTI ID: 390008
• Report Number(s): CONF-950727--
• Journal Information: IEEE Transactions on Power Systems, Journal Name: IEEE Transactions on Power Systems Journal Issue: 3 Vol. 11; ISSN ITPSEG; ISSN 0885-8950
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
DETECTION
ELECTRICAL TRANSIENTS
INSTABILITY
ON-LINE MEASUREMENT SYSTEMS
POWER SYSTEMS