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

Chang-Hwan Park, In-Kyo Seo, Belete Belayneh Negesse, Jong-su Yoon and Jang-Mok Kim
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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

Energies, 2021, vol. 14, issue 6, 1-21

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.

Keywords: modular multilevel converter; common mode voltage; medium voltage application; NLM + PWM; space vector (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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