Power System Stability Agents Using Robust Wide-Area Control

Conventional power system stabilizers (PSS) are major local damping controllers acting through generator excitation systems. There are studies that suggest that remote signals could si-crease damping beyond that attainable by local signals. A supervisory level power system stabilizer (SPSS) using wide-area measurements is proposed. The robustness of the proposed controller is capable of compensating for the nonlinear dynamic operation of power systems and uncertain disturbances. The coordination of the robust SPSSs and local PSSs is implemented based on the principles of multiagent system theory. This theory is an active branch of applications in distributed artificial intelligence (DAI). The performance of the robust controller as a power system stability agent is studied using a 29-machine 179-bus power system example.