A Non-Stop Ice-Melting Method for Icing Lines in Distribution Network Based on a Flexible Grounding Device

Yabing Zhou, Fang Yang, Jiaxin Xu (), Xiaoliang Tang, Jiangyun Wang and Dayi Li ()
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Yabing Zhou: Qingyuan Power Supply Bureau China Southern Power Grid Corporation, Qingyuan 511518, China
Fang Yang: Qingyuan Power Supply Bureau China Southern Power Grid Corporation, Qingyuan 511518, China
Jiaxin Xu: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xiaoliang Tang: Qingyuan Power Supply Bureau China Southern Power Grid Corporation, Qingyuan 511518, China
Jiangyun Wang: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Dayi Li: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2025, vol. 18, issue 8, 1-21

Abstract: Icing on transmission lines poses a serious threat to the power grid. Existing de-icing solutions have limitations in short-distance distribution networks with multiple branches. We propose a method that utilizes a flexible grounding device to adjust the zero-sequence reactive current in the distribution network, enabling de-icing of lines without power interruption. Simulation and experimental results validate the feasibility and effectiveness of the proposed method and control scheme. The method can accurately regulate the de-icing current to achieve de-icing under various conditions, with the actual de-icing current deviating from the set value by less than 0.3%. During de-icing, the line voltage on the load side remains essentially stable, with an error of less than 0.5%, ensuring that the normal supply voltage of the distribution network is not affected, and the entire network load does not require a power outage. The de-icing device interacts only with reactive power in the distribution network, saving capacity for the DC voltage stabilizing power supply and demonstrating good economic efficiency.

Keywords: ice and snow disaster of the power grid; distribution networks; flexible grounding device; zero-sequence reactive current; online ice-melting without power outages (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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