Analysis and Design of a Robust Power System Damping Controller Considering Time Delay

This article presents a detailed analysis and design of a static var compensator damping controller for a power system. The drawbacks of the conventional approach to the design of damping controllers are demonstrated. It is found that the interaction between the static var compensator and other system control modes can be worsened by time delay. The relation between time delay uncertainty and control interaction is revealed, using the proposed analysis framework, and is also demonstrated using non-linear simulations. A robust controller based on the -synthesis method is designed to overcome the design challenges.