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A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter

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  • Chang-Hwan Park

    (Department of Electrical and Computer Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea)

  • In-Kyo Seo

    (Air Solution Control Research Division, LG Electronic, 84, Wanam-ro, Seongsan-gu, Changwon 51554, Korea)

  • Belete Belayneh Negesse

    (Department of Electrical and Computer Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea)

  • Jong-su Yoon

    (Power Transmission Laboratory, KEPCO Research Institute, 105, Munji-ro, Yuseong-gu, Daejeon 34056, Korea)

  • Jang-Mok Kim

    (Department of Electrical and Computer Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea)

Abstract

Low level modular multilevel converter (MMC) is a promising candidate for medium voltage applications such as MVDC (medium voltage DC current) transmission and megawatt machine drives. Unlike high-level MMC using nearest level modulation (NLM), the low-level MMC using the pulse width modulation (PWM) or NLM + PWM is affected by a common mode voltage (CMV) due to a frequent change of a switching state. This CMV causes electromagnetic interference (EMI) noise, common mode current (CMC) and bearing current leading to a reduction in the efficiency and durability of the motor drive system. Therefore, this paper provides a mathematical analysis on how the switching state affects the CMV and proposes three software based CMV reduction algorithms for the low level MMC system. To reflect the characteristic of MMC modulation strategy for upper and lower reference voltage independently, two separate space vectors are used. Based on the analysis, three different CMV reduction algorithms (complete CMV reduction (CCR), DPWM CMV reduction (DCR) and partial CMV reduction (PCR)) are proposed using NLC + PWM modulation strategy. The performance of the proposed CMV reduction algorithms was verified by both simulation and experimental result.

Suggested Citation

  • Chang-Hwan Park & In-Kyo Seo & Belete Belayneh Negesse & Jong-su Yoon & Jang-Mok Kim, 2021. "A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter," Energies, MDPI, vol. 14(6), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:6:p:1607-:d:516662
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    References listed on IDEAS

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    1. Ming Liu & Zetao Li & Xiaoliu Yang, 2020. "A Universal Mathematical Model of Modular Multilevel Converter with Half-Bridge," Energies, MDPI, vol. 13(17), pages 1-18, August.
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    Cited by:

    1. Marek Turzyński & Piotr Musznicki, 2021. "A Review of Reduction Methods of Impact of Common-Mode Voltage on Electric Drives," Energies, MDPI, vol. 14(13), pages 1-30, July.
    2. Kai Huang & Lie Xu & Guangchen Liu, 2021. "A Diode-MMC AC/DC Hub for Connecting Offshore Wind Farm and Offshore Production Platform," Energies, MDPI, vol. 14(13), pages 1-16, June.

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