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In this paper an adaptive controller is presented for load-frequency control of power systems. The new controller uses a PI adaptation to satisfy the hyperstability condition for taking care of the parameter charlges of the system. Only the available information of the states and output of the model as well as the plant output are required f.or the control. No explicit parameter identification is required. Furthermore, the proposed controller can be designed by using a reduced plant model to simplify the design without degrading much the performance. It follow9 that the new controller possesses a very attractive merit of being very easy to implement practically. The simulation results indicate that good control performance can be obtained by this proposed controller, and the performance is insensitive to the plant parameter changes. Moreover, the effectiveness of the proposed controller for considering the generation rate limit can also be confirmed.

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