Control Strategy for the Ultra-Super Critical Coal-firing Thermal Power Plant

The control strategy for ultra super critical (USC) thermal power plant having 1000 MW rated power is developed. This paper reviews the control hierarchical structure and its functions. To implement the integrated control system, this paper considers what kinds of information are to transfer between the subsystems comprising the integrated control system. In addition, this paper addresses the operation mode of the power plant and the control strategy, especially the automatic plant control (APC), strictly following the concept of hierarchy. This strategy makes the plant demand only at the top of structure reflecting the status of controllers in the lower level of structure and feeds it through the controllers, while in the existing and widely used strategies in most thermal power plant, any control block in the lower level must make its own demand value based on the demand of other block, not based on the demand from the higher level of the structure depending on the operation mode of the plant