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Open AccessFeature PaperArticle

Dynamic Optimization of a Subcritical Steam Power Plant Under Time-Varying Power Load

Department of Chemical & Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Unit 3222, Storrs, CT 06269, USA
Author to whom correspondence should be addressed.
Processes 2018, 6(8), 114;
Received: 2 June 2018 / Revised: 13 July 2018 / Accepted: 21 July 2018 / Published: 3 August 2018
(This article belongs to the Special Issue Modeling and Simulation of Energy Systems )
The increasing variability in power plant load in response to a wildly uncertain electricity market and the need to to mitigate CO2 emissions, lead power plant operators to explore advanced options for efficiency optimization. Model-based, system-scale dynamic simulation and optimization are useful tools in this effort and are the subjects of the work presented here. In prior work, a dynamic model validated against steady-state data from a 605 MW subcritical power plant was presented. This power plant model was used as a test-bed for dynamic simulations, in which the coal load was regulated to satisfy a varying power demand. Plant-level control regulated the plant load to match an anticipated trajectory of the power demand. The efficiency of the power plant’s operation at varying loads was optimized through a supervisory control architecture that performs set point optimization on the regulatory controllers. Dynamic optimization problems were formulated to search for optimal time-varying input trajectories that satisfy operability and safety constraints during the transition between plant states. An improvement in time-averaged efficiency of up to 1.8% points was shown to be feasible with corresponding savings in coal consumption of 184.8 tons/day and a carbon footprint decrease of 0.035 kg/kWh. View Full-Text
Keywords: power plants; supervisory control; dynamic simulation; dynamic optimization power plants; supervisory control; dynamic simulation; dynamic optimization
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Chen, C.; Bollas, G.M. Dynamic Optimization of a Subcritical Steam Power Plant Under Time-Varying Power Load. Processes 2018, 6, 114.

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