ON THE DESIGN OF AN OPTIMAL AUTOMATIC-GENERATION CONTROLLER FOR INTERCONNECTED POWER-SYSTEMS

An optimal controller combining the optimal pole placement technique a nd the dominant energy mode concept for the automatic generation contr ol of power systems is presented in this paper. Firstly, based on the physical reasoning about the power plant to be controlled, the weighti ng matrix is roughly selected and the optimal feedback gain vector is found. Then the weighting matrix and thus the feedback gain are sequen tially modified to let the dominant energy eigenvalues of the closed-l oop system be placed in the desired region. A technique for determinin g the dominant energy eigenvalues of MIMO systems is proposed. Imprope r eigenvalue placement can be avoided, and very good control performan ce can be obtained. The proposed method is applied to design an automa tic generation controller for an interconnected thermal power system. The simulation results indicate that very good dynamic responses of th e area frequency deviations and tie-line power deviation are achieved.