Title :
On-line detection of power system small disturbance voltage instability
Author :
Wang, Liancheng ; Girgis, Adly A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Clemson Univ., SC, USA
fDate :
8/1/1996 12:00:00 AM
Abstract :
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
Keywords :
identification; power system analysis computing; power system stability; reactive power; Q angle; Q directional derivatives; constant current load; constant impedance load; generator VAr limits; on-line detection; operating condition; power systems; small disturbance voltage stability; voltage collapse point; voltage instability detection; weak bus identification; Circuit stability; Computational modeling; Jacobian matrices; Load flow; Power system simulation; Power system stability; Power systems; Stability analysis; Steady-state; Voltage;
Journal_Title :
Power Systems, IEEE Transactions on