LQI-Type Load-Frequency Control Having One Time Controlling Delay for Multi-Area Electric Energy Systems

This paper presents a new method of designing discrete-type load-frequency regulator for interconnected power systems. An especially attractive feature of the proposed control scheme is that it requires as inputs signals accumulative quantities of area control error. An additional feature is that it considers the time delay due to the computation time of the control law and the transmission time of the system data over the telemeter links to the controlling plant. The realization of such a regulator may be easy and of low cost because of its simple construction. In this paper, we apply the above method to 3～5 area systems provided with nonreheat type turbines. The results show that the proposed discrete-type regulator can act satisfactorily for improving dynamic responses of the load-frequency control