Design of new optimal power system voltage regulators with greater domain of validity

The design of new optimal nonlinear voltage regulator for power systems is considered. In the proposed approach, the Hamilton-Jacobi-Belman (HJB), a partial differential equation, is solved using Taylor series expansion of its nonlinear terms. The performance of the proposed controller in a single-machine infinite-bus power system is simulated and the advantages of the nonlinear feedback controllers are investigated. The proposed controller action is simulated in different operation points. Simulation results show that the resulting nonlinear controller has greater domain of validity than that of linearized counterpart.