## Decentralized adaptive PI control strategies for frequency control of interconnected systems.(English)Zbl 0772.93049

The primary function of an electric power system is to produce the real and reactive powers demanded by the various loads connected to the system. A linear quadratic decentralized PI control scheme with prescribed closed-loop eigenvalues, for load frequency control problem while the power system is subject to known constant plus unknown time- varying load disturbance, is aimed in this paper. Section 2 deals with the problem statement. In section 3, decentralized PI controller based on decentralized state estimation with prescribed eigenvalues is developed. PI controller algorithm alone will not work satisfactorily to reject time-varying load disturbance or system parameter variation. Then, section 4 deals with an effective decentralized adaptive control, where local adaptive control based on minimum prediction error principle is superposed on local PI decentralized control. In section 5, some simulation results of the proposed control algorithms are presented.
Reviewer: K.Ichikawa (Tokyo)