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Leveraging Energy Storage in a Solar-Tower and Combined Cycle Hybrid Power Plant

Department of Chemical Engineering, University of Utah, Salt Lake City, UT 84112-9203, USA
Author to whom correspondence should be addressed.
Energies 2019, 12(1), 40;
Received: 29 November 2018 / Revised: 14 December 2018 / Accepted: 19 December 2018 / Published: 24 December 2018
(This article belongs to the Special Issue Alternative Sources of Energy Modeling and Automation)
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A method is presented to enhance solar penetration of a hybrid solar-combined cycle power plant integrated with a packed-bed thermal energy storage system. The hybrid plant is modeled using Simulink and employs systems-level automation. Feedback control regulates net power, collector temperature, and turbine firing temperature. A base-case plant is presented, and plant design is systematically modified to improve solar energy utilization. A novel recycling configuration enables robust control of collector temperature and net power during times of high solar activity. Recycling allows for improved solar energy utilization and a yearly solar fraction over 30%, while maintaining power control. During significant solar activity, excessive collector temperature and power setpoint mismatch are still observed with the proposed recycling configuration. A storage bypass is integrated with recycling, to lower storage charging rate. This operation results in diverting only a fraction of air flow to storage, which lowers the storage charging rate and improves solar energy utilization. Recycling with a storage bypass can handle larger solar inputs and a solar fraction over 70% occurs when following a drastic peaking power load. The novel plant configuration is estimated to reduce levelized cost of the plant by over 4% compared to the base-case plant. View Full-Text
Keywords: concentrated solar power; hybridization; thermal energy storage; simulation; control concentrated solar power; hybridization; thermal energy storage; simulation; control

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Ellingwood, K.; Safdarnejad, S.M.; Rashid, K.; Powell, K. Leveraging Energy Storage in a Solar-Tower and Combined Cycle Hybrid Power Plant. Energies 2019, 12, 40.

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