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Open AccessArticle

Optimized Design of Modular Multilevel DC De-Icer for High Voltage Transmission Lines

State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment, State Grid Hunan Electric Company Limited Disaster Prevention and Reduction Center, Changsha 410129, China
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Electronics 2018, 7(9), 204; https://doi.org/10.3390/electronics7090204
Received: 17 August 2018 / Revised: 8 September 2018 / Accepted: 14 September 2018 / Published: 17 September 2018
(This article belongs to the Special Issue Applications of Power Electronics)
Ice covering on overhead transmission lines would cause damage to transmission system and long-term power outage. Among various de-icing devices, a modular multilevel converter based direct-current (DC)de-icer (MMC-DDI) is recognized as a promising solution due to its excellent technical performance. Its principle feasibility has been well studied, but only a small amount of literature discusses its economy or hardware optimization. To fill this gap, this paper presents a quantitative analysis and calculation on the converter characteristics of MMC-DDI. It reveals that, for a given DC de-icing requirement, the converter rating varies greatly with its alternating-current (AC) -side voltage, and it sometimes far exceeds the melting power. To reduce converter rating and improve its economy, an optimized configuration is proposed in which a proper transformer should be configured on the input AC-side of converter under certain conditions. This configuration is verified in an MMC-DDI for a 500 kV transmission line as a case study. The result shows, in the case of outputting the same de-icing characteristics, the optimized converter is reduced from 151 MVA to 68 MVA, and the total cost of the MMC-DDI system is reduced by 48%. This conclusion is conducive to the design optimization of multilevel DC de-icer and then to its engineering application. View Full-Text
Keywords: converter; ice melting; modular multilevel converter (MMC); optimization design; transmission line; static var generator (SVG) converter; ice melting; modular multilevel converter (MMC); optimization design; transmission line; static var generator (SVG)
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Lu, J.; Huang, Q.; Mao, X.; Tan, Y.; Zhu, S.; Zhu, Y. Optimized Design of Modular Multilevel DC De-Icer for High Voltage Transmission Lines. Electronics 2018, 7, 204.

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