Abstract
Since heat exchanger networks (HEN) widely exist in fossil, nuclear and chemical plants, the modeling and control of HEN plays a key role in providing satisfactory plant transients under load variations as well as interior and exterior disturbances. In this paper, a dynamic model of HEN is proposed based on the thermodynamics of a single heat exchanger and the directed graph describing the interconnection amongst multiple heat exchangers. By adopting the ectropy as storage function, it is shown that both a single heat exchanger and a complex HEN are strictly passive. A passivity-based HEN control is then given, which can provide globally asymptotic stability while taking a simple form of PI algorithm. Finally, the designed control law is applied to the regulation of the HEN for nuclear district heating, and numerical simulation results verifies the theoretical results.
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