Short-Term Operation Scheduling of a Microgrid under Variability Contracts to Preserve Grid Flexibility

Sunwoong Kim, Dam Kim and Yong Tae Yoon
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Sunwoong Kim: Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea
Dam Kim: Department of Statistics, Institute of Engineering Research, Seoul National University, Seoul 08826, Korea
Yong Tae Yoon: Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea

Energies, 2019, vol. 12, issue 18, 1-16

Abstract: The conventional microgrid (MG) price-based operation scheme with respect to the hourly market price considers only profit maximization from energy transactions and disregards variability. This causes flexibility burdens on the main grid system operator (SO), which must then utilize its ramping capability to cover the net load variability. As the proportion of renewable energy sources (RESs) involving intermittency in MGs continues to increase owing to global energy policies, net load variability within shorter time intervals has also increased, making proper management guidelines necessary. Thus, this paper proposes an MG-SO variability contract on intra-hour and inter-hour time intervals for regulating variability such that the SO can support and distribute its relevant costs between the MG and the SO. To prove the effectiveness of the proposed contract, an MG variability contract-based scheduling model is also proposed, and the results were compared with those of the price-based model. A case study demonstrates that the introduction of RESs increases the variability in shorter intervals and that the suggested contract is effective in terms of decreasing the variability with increased MG operating costs. A sensitivity analysis between the reduced variability and additional operating costs was also conducted in the case study.

Keywords: microgrid operation; grid flexibility; variability contract; tie-line flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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