Distributionally Robust Chance-Constrained Approximate AC-OPF With Wasserstein Metric



Duan, Chao ORCID: 0000-0001-7358-3524, Fang, Wanliang, Jiang, Lin ORCID: 0000-0001-6531-2791, Yao, Li and Liu, Jun
(2018) Distributionally Robust Chance-Constrained Approximate AC-OPF With Wasserstein Metric. IEEE TRANSACTIONS ON POWER SYSTEMS, 33 (5). pp. 4924-4936.

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Abstract

Chance constrained optimal power flow (OPF) has been recognized as a promising framework to manage the risk from variable renewable energy (VRE). In the presence of VRE uncertainties, this paper discusses a distributionally robust chance constrained approximate ac-OPF. The power flow model employed in the proposed OPF formulation combines an exact ac power flow model at the nominal operation point and an approximate linear power flow model to reflect the system response under uncertainties. The ambiguity set employed in the distributionally robust formulation is the Wasserstein ball centered at the empirical distribution. The proposed OPF model minimizes the expectation of the quadratic cost function w.r.t. the worst-case probability distribution and guarantees the chance constraints satisfied for any distribution in the ambiguity set. The whole method is data-driven in the sense that the ambiguity set is constructed from historical data without any presumption on the type of the probability distribution, and more data leads to smaller ambiguity set and less conservative strategy. Moreover, special problem structures of the proposed problem formulation are exploited to develop an efficient and scalable solution approach. Case studies are carried out on the IEEE 14 and 118 bus systems to show the accuracy and necessity of the approximate ac model and the attractive features of the distributionally robust optimization approach compared with other methods to deal with uncertainties.

Item Type: Article
Uncontrolled Keywords: Optimal power flow, distributionally robust optimization, chance constraints, uncertainty, ambiguity
Depositing User: Symplectic Admin
Date Deposited: 15 Nov 2018 09:17
Last Modified: 15 Mar 2024 04:53
DOI: 10.1109/TPWRS.2018.2807623
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3028868