Scalable control of power systems

This paper considers the scalable control of power systems, i.e., control with the constraint that controllers of all generators are the same. Imposing this constraint reduces the time and effort required to construct large-scale power systems because we can obtain controllers of all generators merely by designing one controller. Power system control with this constraint has not been discussed in existing studies where controllers of generators have been assumed to be separately designed and implemented. The problem addressed here is to find the same controllers for stabilizing an equilibrium point of the resulting feedback system and improving the performance in terms of the time response. As a solution to this problem, we present controllers to increase the damping forces of generators uniformly. Then, we prove that the equilibrium point of the resulting feedback system is stable under certain conditions. Further, we present a design method of the controller gain to minimize a performance index for evaluating the time response of the resulting feedback system. The proposed controllers and design method are verified via numerical simulation.