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PMU-Based Monitoring of Rotor Angle Dynamics

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3 Author(s)
Jie Yan ; Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA ; Chen-Ching Liu ; Vaidya, U.

Online monitoring of rotor angle stability in wide area power systems is an important task to avoid out-of-step instability conditions. In recent years, the installation of phasor measurement units (PMUs) on the power grids has increased significantly and, therefore, a large amount of real-time data is available for online monitoring of system dynamics. This paper proposes a PMU-based application for online monitoring of rotor angle stability. A technique based on Lyapunov exponents is used to determine if a power swing leads to system instability. The relationship between rotor angle stability and maximal Lyapunov exponent (MLE) is established. A computational algorithm is developed for the calculation of MLE in an operational environment. The effectiveness of the monitoring scheme is illustrated with a three-machine system and a 200-bus system model.

Published in:

Power Systems, IEEE Transactions on  (Volume:26 ,  Issue: 4 )