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Processes 2018, 6(8), 114; https://doi.org/10.3390/pr6080114

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
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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)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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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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