An Improved Method for the DCOPF With Losses

This paper discusses the marginal line loss approximation in the dc optimal power flow (DCOPF) and proposes a new methodology that improves the accuracy of current practices. In practice, the DCOPF solution may have significant differences compared to the ac base point that determines marginal losse...

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Bibliographic Details
Published in:IEEE transactions on power systems 2018-07, Vol.33 (4), p.3779-3788
Main Authors: Eldridge, Brent, O'Neill, Richard, Castillo, Anya
Format: Article
Language:English
Subjects:
DC optimal power flow (DCOPF)
Indexes
ISO
iterative algorithms
linear approximation
marginal pricing
Mathematical model
Pricing
Sensitivity
Transmission line matrix methods
transmission losses
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Summary:This paper discusses the marginal line loss approximation in the dc optimal power flow (DCOPF) and proposes a new methodology that improves the accuracy of current practices. In practice, the DCOPF solution may have significant differences compared to the ac base point that determines marginal losses, and this paper provides the only published example that illustrates this problem to our knowledge. The proposed methodology updates the marginal losses without solving a new ac base point so that the optimal solution accurately reflects system losses. Previously proposed methodologies require nonlinear programming solvers, additional ac power flow solutions, or are less accurate compared to actual losses, and they only give results for one or two test networks. This paper provides results on nine different test networks. The key advantage of the proposed methodology is that it can be easily integrated into current market software.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2017.2776081