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Do unit commitment constraints affect generation expansion planning? A scalable stochastic model

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Abstract

Due to increasing penetration of stochastic renewable energy sources in electric power systems, the need for flexible resources especially from fast-start conventional generation units (e.g., combined cycle gas turbine plants) is growing. The fast-start conventional units are being operated more frequently in order to respond to the variability and uncertainty of stochastic generation. This raises two important technical questions: as it is common in the literature, is it still an appropriate simplification to ignore the operational unit commitment (UC) constraints of conventional units within the generation expansion planning optimization? And if not, which UC constraint impacts most the expansion planning outcomes? To answer these questions, this paper aims at measuring the planning inefficiency (i.e., the underestimation of need for new generation capacity) caused by ignoring each UC constraint. To this purpose, we develop a centralized network-constrained generation expansion planning model incorporating UC constraints. In particular, we model start-up and shut-down costs, minimum production level and hourly ramping limits of conventional units. Wind power production is considered as the only source of uncertainty, and is modeled through a set of scenarios. A two-stage stochastic programming tool is used, whose first stage determines the long-term expansion and short-term UC decisions over different hours of representative days, while the second stage models the real-time operation for accommodating imbalances arising from wind deviation under different scenarios. Since this problem is potentially hard to solve especially with a large number of representative days and scenarios, a multi-cut Benders’ decomposition algorithm is implemented. The well-functioning of the proposed model and the impact of each UC constraint on planning outcomes are evaluated using an extensive numerical study. In our case studies, the exclusion of ramping constraints from planning optimization causes large error and is the most distorting simplification.

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Acknowledgements

We thank Amin Nasri for fruitful discussion about the initial model. We also thank Peter Meibom and David Wozabal for constructive feedback.

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  1. Department of Electrical Engineering, Technical University of Denmark, 2800, Kongens Lyngby, Denmark

    Anna Schwele, Jalal Kazempour & Pierre Pinson

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  1. Anna Schwele
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Correspondence to Anna Schwele.

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Schwele, A., Kazempour, J. & Pinson, P. Do unit commitment constraints affect generation expansion planning? A scalable stochastic model. Energy Syst 11, 247–282 (2020). https://doi.org/10.1007/s12667-018-00321-z

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