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Title: Thermal energy storage to minimize cost and improve efficiency of a polygeneration district energy system in a real-time electricity market

Journal Article · · Energy (Oxford)
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Chemical Engineering
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. NXP Semiconductors, Austin, TX (United States)
  5. ExxonMobil, Houston, TX (United States)
  6. Brigham Young Univ., Provo, UT (United States). Dept. of Chemical Engineering
  7. 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
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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Cited By (3)

Optimal sizing and siting of renewable energy resources in distribution systems considering time varying electrical/heating/cooling loads using PSO algorithm journal January 2018
Comparison of Direct and Indirect Active Thermal Energy Storage Strategies for Large-Scale Solar Heating Systems journal May 2019
Predictive Optimization of the Heat Demand in Buildings at the City Level journal May 2019