Advanced Monitoring and Control Approaches for Enhancing Power System Security

Enhancements of power system security can be achieved by developing an online environment where control center operators have the capability to monitor in real time the power system dynamic behavior, recognize threats to its integrity, evaluate, and implement suitable control actions. The methodological approaches proposed here are respectively a spectral analysis based on wavelet transform and a response-based wide-area control for improving power system dynamic behavior on the transient timescale. The monitoring technique consists in processing real-time data coming from phasor measurement units by adopting an approach based on wavelet spectral analysis. The final result is a diagram that shows the amplitude of different modes usually associated to different phenomena (electromechanical modes, inter-area oscillations, etc.) and their related dampings. The methodology proposed for control assessment is based on the solution of a dynamic optimization problem whose basic variables are acquired through a wide-area measurement system.