Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications
The five-level hybrid clamped inverter (5L-HC) is a promising new topology for medium-voltage applications. However, to minimize the capacitors and ensure good performance of the converter, capacitor voltage ripples, as well as voltage balancing control, need further study. Based on carrier-phase-sh...
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IEEE
2019-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/8746220/ |
| _version_ | 1828969851822014464 |
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| author | Ze Wang Chao Gao Canfeng Chen Jian Xiong Kai Zhang |
| author_facet | Ze Wang Chao Gao Canfeng Chen Jian Xiong Kai Zhang |
| author_sort | Ze Wang |
| collection | DOAJ |
| description | The five-level hybrid clamped inverter (5L-HC) is a promising new topology for medium-voltage applications. However, to minimize the capacitors and ensure good performance of the converter, capacitor voltage ripples, as well as voltage balancing control, need further study. Based on carrier-phase-shift PWM (CPS-PWM), this paper gives a rigorous analysis of the ripple characteristics of all the capacitors (which consist of three groups: the flying capacitors, the central dc capacitor, and the upper and lower dc capacitors) under both normal and unbalanced operating conditions. The results can serve as a guide for the optimal design of the capacitors. First, as for the balancing issue, a self-balancing mechanism of the central dc capacitor, which is similar to the better-known self-balancing feature of the flying capacitors, is revealed. Then, a new voltage balancing strategy is proposed for these two groups of capacitors to cope with disturbances arising from various nonideal factors. For the upper and lower dc capacitors, which suffer from intrinsic imbalance, this paper proposes a better method to calculate the optimal zero-sequence voltage (ZSV), which is to be injected to achieve the balancing objective. In this paper, the ripple analysis and balancing strategy proposed are verified with simulations and experiments. |
| first_indexed | 2024-12-14T12:38:39Z |
| format | Article |
| id | doaj.art-3fb1dca6f541488cbfe677f0cd92abe5 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T12:38:39Z |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-3fb1dca6f541488cbfe677f0cd92abe52022-12-21T23:00:58ZengIEEEIEEE Access2169-35362019-01-017860778608910.1109/ACCESS.2019.29251258746220Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage ApplicationsZe Wang0https://orcid.org/0000-0002-4732-6249Chao Gao1Canfeng Chen2Jian Xiong3Kai Zhang4https://orcid.org/0000-0002-5786-6708State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, ChinaThe five-level hybrid clamped inverter (5L-HC) is a promising new topology for medium-voltage applications. However, to minimize the capacitors and ensure good performance of the converter, capacitor voltage ripples, as well as voltage balancing control, need further study. Based on carrier-phase-shift PWM (CPS-PWM), this paper gives a rigorous analysis of the ripple characteristics of all the capacitors (which consist of three groups: the flying capacitors, the central dc capacitor, and the upper and lower dc capacitors) under both normal and unbalanced operating conditions. The results can serve as a guide for the optimal design of the capacitors. First, as for the balancing issue, a self-balancing mechanism of the central dc capacitor, which is similar to the better-known self-balancing feature of the flying capacitors, is revealed. Then, a new voltage balancing strategy is proposed for these two groups of capacitors to cope with disturbances arising from various nonideal factors. For the upper and lower dc capacitors, which suffer from intrinsic imbalance, this paper proposes a better method to calculate the optimal zero-sequence voltage (ZSV), which is to be injected to achieve the balancing objective. In this paper, the ripple analysis and balancing strategy proposed are verified with simulations and experiments.https://ieeexplore.ieee.org/document/8746220/Five-level hybrid clamped inverter (5L-HC)capacitor voltage ripplesvoltage balancingripple suppression |
| spellingShingle | Ze Wang Chao Gao Canfeng Chen Jian Xiong Kai Zhang Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications IEEE Access Five-level hybrid clamped inverter (5L-HC) capacitor voltage ripples voltage balancing ripple suppression |
| title | Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications |
| title_full | Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications |
| title_fullStr | Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications |
| title_full_unstemmed | Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications |
| title_short | Ripple Analysis and Capacitor Voltage Balancing of Five-Level Hybrid Clamped Inverter (5L-HC) for Medium-Voltage Applications |
| title_sort | ripple analysis and capacitor voltage balancing of five level hybrid clamped inverter 5l hc for medium voltage applications |
| topic | Five-level hybrid clamped inverter (5L-HC) capacitor voltage ripples voltage balancing ripple suppression |
| url | https://ieeexplore.ieee.org/document/8746220/ |
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