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Energies 2017, 10(10), 1663; doi:10.3390/en10101663

A Multi-Energy System Expansion Planning Method Using a Linearized Load-Energy Curve: A Case Study in South Korea

1
School of Electrical Engineering & Computer Science, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Korea
2
Department of Energy System Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
3
Research and Development Laboratory, Raonfreinds, 23, 16 Cheomdanbencheo-ro, Buk-gu, Gwangju 61009, Korea
*
Author to whom correspondence should be addressed.
Received: 9 September 2017 / Revised: 28 September 2017 / Accepted: 16 October 2017 / Published: 20 October 2017
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Abstract

Multi-energy systems can integrate heat and electrical energy efficiently, using resources such as cogeneration. In order to meet energy demand cost-effectively in a multi-energy system, adopting appropriate energy resources at the right time is of great importance. In this paper, we propose an expansion planning method for a multi-energy system that supplies heat and electrical energy. The proposed approach formulates expansion planning as a mixed integer linear programming (MILP) problem. The objective is to minimize the sum of the annualized cost of the multi-energy system. The candidate resources that constitute the cost of the multi-energy system are fuel-based power generators, heat-only boilers, a combined heat and power (CHP) unit, energy storage resources, and a renewable electrical power source. We use a load-energy curve, instead of a load-duration curve, for constructing the optimization model, which is subsequently linearized using a Douglas-Peucker algorithm. The residual load-energy curve, for utilizing the renewable electrical power source, is also linearized. This study demonstrates the effectiveness of the proposed method through a comparison with a conventional linearization method. In addition, we evaluate the cost and planning schedules of different case studies, according to the configuration of resources in the multi-energy system. View Full-Text
Keywords: multi-energy system; mixed integer linear programming; energy expansion planning; combined heat and power; renewable electrical power source multi-energy system; mixed integer linear programming; energy expansion planning; combined heat and power; renewable electrical power source
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Ko, W.; Park, J.-K.; Kim, M.-K.; Heo, J.-H. A Multi-Energy System Expansion Planning Method Using a Linearized Load-Energy Curve: A Case Study in South Korea. Energies 2017, 10, 1663.

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