带线路换流器的交直流混合优化功率流的凸化

IF 6.9 2区工程技术 Q2 ENERGY & FUELS

CSEE Journal of Power and Energy Systems Pub Date : 2023-12-28 DOI:10.17775/CSEEJPES.2022.05250

Hongyuan Liang;Zhigang Li;J. H. Zheng;Q. H. Wu

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引用次数: 0

摘要

基于线路换流器（LCC）的高压直流（HVDC）系统已与大容量交流电网集成，用于可再生能源电力的跨区域传输。非线性 LCC 模型给交直流混合电网的最优功率流 (OPF) 带来了额外的非凸性。LCC 电站模型的凸化方法可以解决这种非凸性，但很少有人讨论。我们为经典的 LCC 电站模型设计了一种等效的重述方法，有助于对基于 LCC 的交直流电网 OPF 进行二阶锥凸松弛。我们还提出了凸松弛精确性的充分条件及其证明。我们通过四次数值模拟验证了所提出的 LCC 电站模型和凸松弛的等价性、精确性和有效性。仿真结果表明，从松弛模型中可以有效地获得原始 OPF 的全局最优解。

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Convexification of Hybrid AC-DC Optimal Power Flow with Line-Commutated Converters

Line-commutated converter (LCC)-based high-voltage DC (HVDC) systems have been integrated with bulk AC power grids for interregional transmission of renewable power. The nonlinear LCC model brings additional nonconvexity to optimal power flow (OPF) of hybrid AC-DC power grids. A convexification method for the LCC station model could address such nonconvexity but has rarely been discussed. We devise an equivalent reformulation for classical LCC station models that facilitates second-order cone convex relaxation for the OPF of LCC-based AC-DC power grids. We also propose sufficient conditions for exactness of convex relaxation with its proof. Equivalence of the proposed LCC station models and properties, exactness, and effectiveness of convex relaxation are verified using four numerical simulations. Simulation results demonstrate a globally optimal solution of the original OPF can be efficiently obtained from relaxed model.

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来源期刊

CSEE Journal of Power and Energy Systems Energy-Energy (all)

CiteScore

11.80

自引率

12.70%

发文量

389

审稿时长

26 weeks

期刊介绍： The CSEE Journal of Power and Energy Systems (JPES) is an international bimonthly journal published by the Chinese Society for Electrical Engineering (CSEE) in collaboration with CEPRI (China Electric Power Research Institute) and IEEE (The Institute of Electrical and Electronics Engineers) Inc. Indexed by SCI, Scopus, INSPEC, CSAD (Chinese Science Abstracts Database), DOAJ, and ProQuest, it serves as a platform for reporting cutting-edge theories, methods, technologies, and applications shaping the development of power systems in energy transition. The journal offers authors an international platform to enhance the reach and impact of their contributions.