Robust nonlinear controller with voltage regulation

A robust nonlinear controller for improving multi-machine power system transient stability as well as achieving voltage regulation is presented in this paper. The controller is a direct feedback linearization (DFL) controller with a PI type voltage servo compensator. The DFL controller is used to alleviate the nonlinearities and interconnections in multi-machine power systems. A design method is proposed to guarantee the stability of the whole system and achieve voltage regulation simultaneously. Using the proposed approach, measurement of power angle is not necessary for implementing the decentralized nonlinear controller. Simulation results of the proposed scheme on example systems show that the damping and stability of the system are improved in a large operating region.