Decentralized nonlinear H? controller for large scale power systems
The aim of this paper is to design nonlinear decentralized controllers for multi-machine power systems. The design procedure is based on H? control theory and consists of two parts. First, the feedback linearization technique is used. Then, a robust controller is designed using the linear matrix inequalities (LMI) approach. The controller has two blocks. One, is a nonlinear function of some local measurable signals such as the generator active and reactive powers, the rotor speed and the armature current. The other block is a PID controller. The linear H? theory is used to tune the PID parameters. The method results in a controller which is easy for implementing in practice. The performance of the controller is tested on a sample multi-machine power system model. Simulation results show the effectiveness, robustness and good performance of the proposed controller.
h? control linear matrix inequalities (lmis) power system control large scale system nonlinear control systems