Advanced control of superheater steam temperatures an evaluation based on practical applications

Tight superheater steam temperature control is a precondition for obtaining long lifetime, high efficiency: high load following capability and high av ailability in modern power plants. The intention of this paper is to produc e an evaluation on a general level based on several practical applications within the Danish power industry. Different types of advanced feedback cont rol strategies have been implemented and compared - this evaluation include s conventional control, model-based control and fuzzy control. Further more , a feedforward strategy based on radiation pyrometry and adaptive filterin g has been used successfully to improve the stability and availability of a power plant. It is suggested that further efforts be invested in the devel opment of multivariable strategies and utilization of new instrumentation f or feedforward control rather than into development of new feedback control strategies. (C) 1999 Elsevier Science Ltd. All rights reserved.