Power swing damping controller design using an iterative linear matrix inequality algorithm

This paper discusses a new iterative method for designing power swing dampi ng controllers. The method solves directly for a low-order robust controlle r, and if convergence is achieved, results in the closed-loop system satisf ying a frequency-domain bound. It is based on the optimization of dynamic s ystems with linear matrix inequalities as the design constraints. Controlle r constraints such as decentralization and positive realness can also be in cluded in the design. The proposed method is used to design a power system stabilizer for a single-machine infinite-bus system and a decentralized two -channel series and shunt capacitor damping controller for a three-area sys tem.