Damping controller design through simultaneous stabilization technique

The paper extends the concept of simultaneous stabilization in the multi-variable framework. The concept is applied for multiple swing mode damping through a single FACTS device. An optimization problem is solved to determine controller parameters that would guarantee closed-loop poles in certain target locations with preferential treatment to those corresponding in the iner-area modes. Plant mode is under different operating conditions are incorporated in the design formulation to achieve performance robustness. A min-max approach is adopted to optimize the worst case scenario. The control design methodology is illustrated for a prototype power system. The performance is verified through time-domain simulations.