A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter
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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-03-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/6/1607 |
| _version_ | 1827697717989605376 |
|---|---|
| author | Chang-Hwan Park In-Kyo Seo Belete Belayneh Negesse Jong-su Yoon Jang-Mok Kim |
| author_facet | Chang-Hwan Park In-Kyo Seo Belete Belayneh Negesse Jong-su Yoon Jang-Mok Kim |
| author_sort | Chang-Hwan Park |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T13:15:43Z |
| format | Article |
| id | doaj.art-addf3d7261a1473fa7bf3065c05cd80c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T13:15:43Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-addf3d7261a1473fa7bf3065c05cd80c2023-11-21T10:26:26ZengMDPI AGEnergies1996-10732021-03-01146160710.3390/en14061607A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel ConverterChang-Hwan Park0In-Kyo Seo1Belete Belayneh Negesse2Jong-su Yoon3Jang-Mok Kim4Department of Electrical and Computer Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, KoreaAir Solution Control Research Division, LG Electronic, 84, Wanam-ro, Seongsan-gu, Changwon 51554, KoreaDepartment of Electrical and Computer Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, KoreaPower Transmission Laboratory, KEPCO Research Institute, 105, Munji-ro, Yuseong-gu, Daejeon 34056, KoreaDepartment of Electrical and Computer Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, KoreaLow 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.https://www.mdpi.com/1996-1073/14/6/1607modular multilevel convertercommon mode voltagemedium voltage applicationNLM + PWMspace vector |
| spellingShingle | Chang-Hwan Park In-Kyo Seo Belete Belayneh Negesse Jong-su Yoon Jang-Mok Kim A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter Energies modular multilevel converter common mode voltage medium voltage application NLM + PWM space vector |
| title | A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter |
| title_full | A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter |
| title_fullStr | A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter |
| title_full_unstemmed | A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter |
| title_short | A Study on Common Mode Voltage Reduction Strategies According to Modulation Methods in Modular Multilevel Converter |
| title_sort | study on common mode voltage reduction strategies according to modulation methods in modular multilevel converter |
| topic | modular multilevel converter common mode voltage medium voltage application NLM + PWM space vector |
| url | https://www.mdpi.com/1996-1073/14/6/1607 |
| work_keys_str_mv | AT changhwanpark astudyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT inkyoseo astudyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT beletebelaynehnegesse astudyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT jongsuyoon astudyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT jangmokkim astudyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT changhwanpark studyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT inkyoseo studyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT beletebelaynehnegesse studyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT jongsuyoon studyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter AT jangmokkim studyoncommonmodevoltagereductionstrategiesaccordingtomodulationmethodsinmodularmultilevelconverter |