On the design of an optimal automatic generation controller for interconnected power systems

Abstract An optimal controller combining the optimal pole placement technique and the dominant energy mode concept for the automatic generation control of power systems is presented in this paper. Firstly, based on the physical reasoning about the power plant to be controlled, the weighting matrix is roughly selected and the optimal feedback gain vector is found. Then the weighting matrix and thus the feedback gain are sequentially modified to let the dominant energy eigenvalues of the closed-loop system be placed in the desired region. A technique for determining the dominant energy eigenvalues of MIMO systems is proposed. Improper eigenvalue placement can be avoided, and very good control performance can be obtained. The proposed method is applied to design an automatic generation controller for an interconnected thermal power system. The simulation results indicate that very good dynamic responses of the area frequency deviations and tie-line power deviation are achieved.