Geometry of power flows and convex-relaxed power flows in distribution networks with high penetration of renewables

Shaojun Huang, Qiuwei Wu, Haoran Zhao, Zhaoxi Liu

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Abstract

Renewable energies are increasingly integrated in electric distribution networks and will cause severe overvoltage issues. Smart grid technologies make it possible to use coordinated control to mitigate the overvoltage issues and the optimal power flow (OPF) method is proven to be efficient in the applications such as curtailment management and reactive power control. Nonconvex nature of the OPF makes it difficult to solve and convex
relaxation is a promising method to solve the OPF very efficiently. This paper investigates the geometry of the power flows and the convex-relaxed power flows when high penetration level of renewables is present in the distribution networks. The geometry study helps understand the fundamental nature of the OPF and its convex-relaxed problem, such as the second-order cone programming (SOCP) problem. A case study based on a three-node system is used to illustrate the geometry profile of the feasible sub-injection (injection of nodes excluding the root/substation node) region
Original languageEnglish
JournalEnergy Procedia
Volume100
Number of pages8
ISSN1876-6102
DOIs
Publication statusPublished - 2016
Event3rd International Conference on Power and Energy Systems Engineering - Kyushu Institute of Technology, Kitakyushu, Japan
Duration: 8 Sep 201612 Sep 2016

Conference

Conference3rd International Conference on Power and Energy Systems Engineering
LocationKyushu Institute of Technology
CountryJapan
CityKitakyushu
Period08/09/201612/09/2016

Bibliographical note

© 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license

Keywords

  • Power flow
  • Convex relaxation
  • Distribution network
  • Distributed energy resources

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