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Energies 2017, 10(11), 1917; https://doi.org/10.3390/en10111917

Considering Maintenance Cost in Unit Commitment Problems

1
Department of Statistics, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
2
School of Information Technology & Electrical Engineering, The University of Queensland, St. Lucia, QLD 4072, Australia
3
Korea Railroad Research Institute, 176 Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do 16105, Korea
4
Raon Friends, 267 Simin-daero, Dongan-gu, Anyang-si, Gyeonggi-do 14054, Korea
*
Author to whom correspondence should be addressed.
Received: 11 August 2017 / Revised: 16 September 2017 / Accepted: 17 November 2017 / Published: 21 November 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

Electric power systems worldwide are receiving an increasing volume of wind power generation (WPG) because of environmental concerns and cost declines associated with technological innovation. To manage the uncertainty of WPG, a system operator must commit sufficient conventional generators to provide an appropriate reserve. At times, frequent start and stop operations are applied to certain generators, which incurs maintenance costs associated with thermal-mechanical fatigue. In this paper, we suggest a comprehensive approach to unit commitment (UC) that considers maintenance cost: the parameters of equivalent start (ES) and equivalent base load hours (EBHs) are adopted in the UC problem to determine optimal generation scheduling. A new formulation for the maintenance cost that can be readily combined with an existing mixed integer linear programming algorithm is presented. The effectiveness of the proposed UC method is verified through simulations based on an IEEE 118-bus test system. The simulation results show that considering maintenance cost in the UC problem effectively restricts frequent start and stop operation scheduling. Furthermore, the operating cost is reduced, the required reserve level is maintained, and the computational time is comparable with that of the conventional UC method. View Full-Text
Keywords: unit commitment; maintenance cost; daily start and stop operation; weekly start and stop operation; equivalent start; equivalent base hours unit commitment; maintenance cost; daily start and stop operation; weekly start and stop operation; equivalent start; equivalent base hours
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Park, H.; Park, J.; Park, J.-Y.; Heo, J.-H. Considering Maintenance Cost in Unit Commitment Problems. Energies 2017, 10, 1917.

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