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arXiv 1902.04815math.OC
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AC最优潮流的不精确凸松弛:关于AC的可行性

Inexact Convex Relaxations for AC Optimal Power Flow: Towards AC Feasibility

Andreas Venzke, Spyros Chatzivasileiadis, Daniel K. Molzahn

摘要:

交流最优潮流问题的凸松弛法由于在某些情况下可证明其能使原非凸问题获得全局最优值而引起了人们的极大兴趣。然而,如果松弛是不精确的,所得到的解决方案是不AC-可行的。所得到的解决方案的质量是必不可少的几个实际应用的AC-OPF,但在现有的文献中缺乏详细的分析。本文旨在弥补这一差距。我们提供了一个深入的调查的解决方案的特点时,凸松弛是不准确的,我们评估最有前途的AC可行性恢复方法的大规模系统,我们提出了两个新的指标,导致更好地了解所确定的解决方案的质量。我们对96个不同的测试案例进行了全面的评估,范围从14到3120总线,我们表明:(一)尽管最优差距小于1%,几个测试案例仍然表现出相当大的距离AC可行性和局部最优性和新提出的指标表征这些偏差。(ii)惩罚方法无法恢复AC-可行解在15的45种情况下,并使用建议的指标,我们表明,大多数失败的测试实例表现出相当大的距离AC-可行性和局部最优。对于失败的测试实例与小的距离,我们展示了我们提出的指标通知微调的惩罚权重,以获得AC-可行解。(iii)温启动非凸解算器的计算效益有显着的变化,但在超过75%的情况下存在计算加速。

英文摘要:

Convex relaxations of AC optimal power flow (AC-OPF) problems have attracted significant interest as in several instances they provably yield the global optimum to the original non-convex problem. If, however, the relaxation is inexact, the obtained solution is not AC-feasible. The quality of the obtained solution is essential for several practical applications of AC-OPF, but detailed analyses are lacking in existing literature. This paper aims to cover this gap. We provide an in-depth investigation of the solution characteristics when convex relaxations are inexact, we assess the most promising AC feasibility recovery methods for large-scale systems, and we propose two new metrics that lead to a better understanding of the quality of the identified solutions. We perform a comprehensive assessment on 96 different test cases, ranging from 14 to 3120 buses, and we show the following: (i) Despite an optimality gap of less than 1%, several test cases still exhibit substantial distances to both AC feasibility and local optimality and the newly proposed metrics characterize these deviations. (ii) Penalization methods fail to recover an AC-feasible solution in 15 out of 45 cases, and using the proposed metrics, we show that most failed test instances exhibit substantial distances to both AC-feasibility and local optimality. For failed test instances with small distances, we show how our proposed metrics inform a fine-tuning of penalty weights to obtain AC-feasible solutions. (iii) The computational benefits of warm-starting non-convex solvers have significant variation, but a computational speedup exists in over 75% of the cases.

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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