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arXiv 1806.08620math.OC
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最优潮流半定松弛算法的鲁棒性和可扩展性

On the Robustness and Scalability of Semidefinite Relaxation for Optimal Power Flow Problems

Anders Eltved, Joachim Dahl, Martin S. Andersen

摘要:

半定松弛技术在求解非凸最优潮流问题中有着广阔的应用前景。然而,一些独立的数值实验已经导致了对现有SDP求解器的可扩展性和鲁棒性的关注。为了解决这些问题,我们调查了一些数值方面的问题,并比较不同的国家的最先进的解决方案。我们的研究结果表明,半定松弛的大型问题的例子,在10,000总线的顺序可以可靠地解决,并在几分钟内合理的精度。此外,半定松弛的测试用例与25,000总线可以在半小时内可靠地解决;最大的测试用例与82,000总线在8小时内解决。我们还比较了通过半定松弛得到的下界与用非线性最优化方法得到的局部最优解,并计算了最优性间隙。

英文摘要:

Semidefinite relaxation techniques have shown great promise for nonconvex optimal power flow problems. However, a number of independent numerical experiments have led to concerns about scalability and robustness of existing SDP solvers. To address these concerns, we investigate some numerical aspects of the problem and compare different state-of-the-art solvers. Our results demonstrate that semidefinite relaxations of large problem instances with on the order of 10,000 buses can be solved reliably and to reasonable accuracy within minutes. Furthermore, the semidefinite relaxation of a test case with 25,000 buses can be solved reliably within half an hour; the largest test case with 82,000 buses is solved within eight hours. We also compare the lower bound obtained via semidefinite relaxation to locally optimal solutions obtained with nonlinear optimization methods and calculate the optimality gap.

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