Electrical flows over spanning trees

Electrical flows over spanning trees
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跨树上的电流

DOI:
10.1007/s10107-020-01614-x
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发表时间:
2021
影响因子:
2.7
通讯作者:
Nikolova, Evdokia
Nikolova, Evdokia
中科院分区:
数学2区
文献类型:
--
作者:
Gupta, Swati;Khodabakhsh, Ali;Mortagy, Hassan;Nikolova, Evdokia

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Thenetwork reconfigurationproblem seeks to find a rooted treeTsuch that the energy of the (unique) feasible electrical flow overTis minimized. The tree requirement on the support of the flow is motivated by operational constraints in electricity distribution networks. The bulk of existing results on convex optimization over vertices of polytopes and on the structure of electrical flows do not easily give guarantees for this problem, while many heuristic methods have been developed in the power systems community as early as 1989. Our main contribution is to give the first provable approximation guarantees for the network reconfiguration problem. We provide novel lower bounds and corresponding approximation factors for various settings ranging fromfor general graphs, toover grids with uniform resistances on edges, andfor grids with uniform edge resistances and demands. To obtain the result for general graphs, we propose a new method for (approximate) spectral graph sparsification, which may be of independent interest. Using insights from our theoretical results, we propose a general heuristic for the network reconfiguration problem that is orders of magnitude faster than existing methods in the literature, while obtaining comparable performance.
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