Thermal energy storage to minimize cost and improve efficiency of a polygeneration district energy system in a real-time electricity market
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- NXP Semiconductors, Austin, TX (United States)
- ExxonMobil, Houston, TX (United States)
- Brigham Young Univ., Provo, UT (United States). Dept. of Chemical Engineering
- Univ. of Texas, Austin, TX (United States)
District energy systems can produce low-cost utilities for large energy networks, but can also be a resource for the electric grid by their ability to ramp production or to store thermal energy by responding to real-time market signals. In this work, dynamic optimization exploits the flexibility of thermal energy storage by determining optimal times to store and extract excess energy. This concept is applied to a polygeneration distributed energy system with combined heat and power, district heating, district cooling, and chilled water thermal energy storage. The system is a university campus responsible for meeting the energy needs of tens of thousands of people. The objective for the dynamic optimization problem is to minimize cost over a 24-h period while meeting multiple loads in real time. The paper presents a novel algorithm to solve this dynamic optimization problem with energy storage by decomposing the problem into multiple static mixed-integer nonlinear programming (MINLP) problems. Another innovative feature of this work is the study of a large, complex energy network which includes the interrelations of a wide variety of energy technologies. Results indicate that a cost savings of 16.5% is realized when the system can participate in the wholesale electricity market.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE; Univ. of Texas Office of Sustainability
- Grant/Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1469807
- Report Number(s):
- INL/JOU-16-39854-Rev000
- Journal Information:
- Energy (Oxford), Vol. 113, Issue C; ISSN 0360-5442
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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