Abstract
This paper addresses life extension and performance enhancement of aging fossil power plants under a variety of operational modes such as load following, start-up and scheduled shutdown. The key idea is to synthesize a feedforward control policy via optimization of a multi-objective cost functional of plant performance and service life under the constraints of plant dynamics, actuator saturation, operational limitations, and allowable structural damage. Specifically, this control policy is generated via nonlinear programming as a trade-off between the plant performance and equipment life in which the process variables are constrained to limit the structural damage of the critical plant components. Structural damage is calculated via nonlinear dynamic models of fatigue and creep based on the physics of the material degradation occurring in critical components of the power plant.
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