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arXiv 1503.06809eess.SYcs.SY
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径向配电网中的AC OPF——第一部分、第二部分

AC OPF in Radial Distribution Networks - Parts I,II

Ecole Polytechnique Fédérale de Lausanne(洛桑联邦理工学院);Cisco Systems, Inc(思科系统公司)

Konstantina Christakou, Dan-Cristian Tomozei, Jean-Yves Le Boudec, Mario Paolone

AI总结:

本文研究了径向配电网中非线性AC OPF问题,指出现有方法的局限性,并提出基于对偶分解的非近似非凸OPF算法,分为两部分讨论。

摘要:

AC OPF问题在电力系统规划和运行中扮演着关键角色。由于AC潮流方程的非线性性质,OPF问题被证明是非凸的,因此难以求解。大多数提出的OPF求解方法依赖于近似,使问题变得凸优化,但可能导致不精确的解。最近,Farivar和Low提出了一种方法,声称在径向配电网中是精确的,尽管没有明显的近似。在我们的工作中,我们证明这种方法实际上并不精确。一方面,存在对线路电流流动容量约束相关物理网络模型的误解。另一方面,所提出放松方法精确性的证明需要与特定控制变量无界性相关的不现实假设。我们还展示了将这种方法扩展以考虑精确线路模型可能会产生物理上不可行的解。最近,一些贡献提出了依赖于交替方向乘子法(ADMM)的OPF算法。然而,如我们在本文中所展示的,对于某些情况,基于ADMM的非放松OPF问题求解方法无法收敛。为了克服上述限制,我们提出了一种基于乘子法和OPF的对偶分解方法的非近似、非凸OPF问题求解算法。本文分为两部分。在第一部分中,我们专门讨论了BFM和ADMM在求解OPF问题上的局限性。在第二部分中,我们提供了所提出OPF算法的集中版本和分布式异步版本,并使用小型电气网络以及修改后的IEEE 13节点测试馈线评估其性能。

英文摘要:

The optimal power-flow problem (OPF) has played a key role in the planning and operation of power systems. Due to the non-linear nature of the AC power-flow equations, the OPF problem is known to be non-convex, therefore hard to solve. Most proposed methods for solving the OPF rely on approximations that render the problem convex, but that may yield inexact solutions. Recently, Farivar and Low proposed a method that is claimed to be exact for radial distribution systems, despite no apparent approximations. In our work, we show that it is, in fact, not exact. On one hand, there is a misinterpretation of the physical network model related to the ampacity constraint of the lines' current flows. On the other hand, the proof of the exactness of the proposed relaxation requires unrealistic assumptions related to the unboundedness of specific control variables. We also show that the extension of this approach to account for exact line models might provide physically infeasible solutions. Recently, several contributions have proposed OPF algorithms that rely on the use of the alternating-direction method of multipliers (ADMM). However, as we show in this work, there are cases for which the ADMM-based solution of the non-relaxed OPF problem fails to converge. To overcome the aforementioned limitations, we propose an algorithm for the solution of a non-approximated, non-convex OPF problem in radial distribution systems that is based on the method of multipliers, and on a primal decomposition of the OPF. This work is divided in two parts. In Part I, we specifically discuss the limitations of BFM and ADMM to solve the OPF problem. In Part II, we provide a centralized version and a distributed asynchronous version of the proposed OPF algorithm and we evaluate its performances using both small-scale electrical networks, as well as a modified IEEE 13-node test feeder.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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