Study and application of optimal control strategy for automatic generating control(AGC)

On the basis of analyzing the dynamic characteristics of two 350 MW units with direct-firing pulverizing systems and studying the original AGC systems in Ligang Power Plant, a new AGC optimal control strategy is proposed in this paper. The simulation and practical running results show that this improved AGC control strategy not only can use the utmost heat storage capacity of the boiler, but also can expedite the boiler load master command as quickly as possible , so as to enhance the ascending/descending rate of unit load. Finally, the paper also analyzes the maximal load change rate of the unit, and proposes the general criterion for evaluating and increasing the ascending/descending rate of unit load.