Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter
Since a T-type three-level PWM converter has several intrinsic advantages, it has been researched for various applications such as grid-connected converter systems. However, it necessarily requires an additional voltage control loop for balancing the upper and the lower DC-link voltage. To satisfy t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/6/1324 |
| _version_ | 1828137749477064704 |
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| author | Kui-Jun Lee |
| author_facet | Kui-Jun Lee |
| author_sort | Kui-Jun Lee |
| collection | DOAJ |
| description | Since a T-type three-level PWM converter has several intrinsic advantages, it has been researched for various applications such as grid-connected converter systems. However, it necessarily requires an additional voltage control loop for balancing the upper and the lower DC-link voltage. To satisfy this requirement, an offset voltage is widely used to provide a neutral point current without affecting other variables such as total DC-link voltage and three-phase input current. However, these methods are mostly based on the averaged value between the applied offset voltage and the neutral point voltage or current, and there is no exact analytical model. Therefore, in this paper, the exact theoretical relationship between the offset voltage and the neutral point current is analyzed. This result can be expected to be useful for an effective voltage balancing control loop design as well as the better understanding of the whole system operation. The validity of the obtained analytical model is verified by simulation and experimental results. |
| first_indexed | 2024-04-11T18:24:49Z |
| format | Article |
| id | doaj.art-f80503311c5849a5b1b06d6feb4fb263 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T18:24:49Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-f80503311c5849a5b1b06d6feb4fb2632022-12-22T04:09:41ZengMDPI AGEnergies1996-10732020-03-01136132410.3390/en13061324en13061324Analytical Modeling of Neutral Point Current in T-type Three-level PWM ConverterKui-Jun Lee0Department of Electrical Engineering, Korea National University of Transportation, Chungju 27469, KoreaSince a T-type three-level PWM converter has several intrinsic advantages, it has been researched for various applications such as grid-connected converter systems. However, it necessarily requires an additional voltage control loop for balancing the upper and the lower DC-link voltage. To satisfy this requirement, an offset voltage is widely used to provide a neutral point current without affecting other variables such as total DC-link voltage and three-phase input current. However, these methods are mostly based on the averaged value between the applied offset voltage and the neutral point voltage or current, and there is no exact analytical model. Therefore, in this paper, the exact theoretical relationship between the offset voltage and the neutral point current is analyzed. This result can be expected to be useful for an effective voltage balancing control loop design as well as the better understanding of the whole system operation. The validity of the obtained analytical model is verified by simulation and experimental results.https://www.mdpi.com/1996-1073/13/6/1324t-typethree-levelpwm converterneutral point currentmodeling |
| spellingShingle | Kui-Jun Lee Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter Energies t-type three-level pwm converter neutral point current modeling |
| title | Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter |
| title_full | Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter |
| title_fullStr | Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter |
| title_full_unstemmed | Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter |
| title_short | Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter |
| title_sort | analytical modeling of neutral point current in t type three level pwm converter |
| topic | t-type three-level pwm converter neutral point current modeling |
| url | https://www.mdpi.com/1996-1073/13/6/1324 |
| work_keys_str_mv | AT kuijunlee analyticalmodelingofneutralpointcurrentinttypethreelevelpwmconverter |