Distribution line downsizing based on a set of non-dominated solutions for a network reconfiguration problem of an elect
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Distribution line downsizing based on a set of non‑dominated solutions for a network reconfiguration problem of an electric distribution system with many objectives Shinya Sekizaki1 · Takuya Yamasaki1 · Ichiro Nishizaki1 · Tomohiro Hayashida1 · Yuki Kanazawa2 · Kazuhisa Hikoyama2 · Hirokazu Uenishi3 Received: 26 January 2020 / Revised: 25 June 2020 / Accepted: 7 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract To provide electric power supply to consumers even in abnormal situations, the equipment used in electric distribution systems, including distribution lines, have sufficient capacity margins. Maintenance and/or replacement of these lines involving network reconfigurations are routinely performed. Since the monetary costs of equipment investments are significant, downsizing the equipment is important from the standpoint of cost savings. In this paper, we propose a method to downsize distribution lines while maintaining the feasibility of the network reconfigurations. The proposed method consists of three steps. First, (1) sets of non-dominated solutions approximating the Pareto fronts of the network reconfiguration problems are found by a many-objective evolutionary algorithm. Second, (2) the distribution system operator specifies the preferred solutions among the sets found in (1). Finally, (3) a set of downsized lines is chosen from among the set of lines under the condition that the specified reconfiguration procedures remain feasible even after downsizing the lines. A computational experiment using a large-scale distribution system model demonstrates that the proposed method successfully identifies within a practical computational time those distribution lines that provide possibilities for downsizing and their downsized capacities. Keywords Electric distribution network · Network reconfiguration · Many-objective optimization · Evolutionary computation · Downsizing of distribution lines
* Shinya Sekizaki sekizaki@hiroshima‑u.ac.jp 1
Hiroshima University, 1‑4‑1, Kagamiyama, Higashi‑Hiroshima, Hiroshima, Japan
2
Chubu Electric Power Grid Company, 1, Toshincho, Higashi‑ku, Nagoya, Aichi, Japan
3
Chubu Electric Power Company, 1, Toshincho, Higashi‑ku, Nagoya, Aichi, Japan
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1 Introduction Electricity distribution systems have many important components such as distribution substations, power poles, distribution lines, pole transformers, and switches. According to the long-term investment plans for the equipment, much money is invested to provide a reliable supply of electric power as a matter of highest priority. Necessary equipment management such as maintenance, replacement, and upgrades is routinely performed. Electric power is temporarily shut off by “network reconfigurations” so that crews can safely perform maintenance, make replacements, or install upgrades to the distribution systems. Although maintenance outages occur with prior notification to affected consumers and are generally of short duration, they
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