The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation
There is a wide application prospect of Nearest level pulse width modulation (NL-PWM) in cascaded H-bridge (CHB) converter, however, it will produce narrow- and error-pulse in the process of implementation, which has a negative impact on CHB efficiency, output voltage quality and safe operation of p...
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| Format: | Article |
| Language: | English |
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IEEE
2021-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9393873/ |
| _version_ | 1819147372825935872 |
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| author | Jie Mu Zhixuan He Yonghai Xu Xueyin Zhang Yunbo Long |
| author_facet | Jie Mu Zhixuan He Yonghai Xu Xueyin Zhang Yunbo Long |
| author_sort | Jie Mu |
| collection | DOAJ |
| description | There is a wide application prospect of Nearest level pulse width modulation (NL-PWM) in cascaded H-bridge (CHB) converter, however, it will produce narrow- and error-pulse in the process of implementation, which has a negative impact on CHB efficiency, output voltage quality and safe operation of power devices. In this paper, the NL-PWM strategy is improved based on <italic>round</italic> function to solve the narrow pulse of traditional NL-PWM, and a step wave delay update strategy is proposed to solve the error-pulse of NL-PWM. This paper analyzes the basic principle of improved NL-PWM and its ability to avoid narrow pulse of power device, shows the harmonic characteristics of improved NL-PWM, analyzes the generation mechanism of error pulse, and calculates the error of output voltage caused by the proposed step wave delay update strategy. The correctness of theoretical analysis and the effectiveness of the proposed method are verified by simulation and experiment. The research shows that the improved NL-PWM can effectively prevent narrow pulse while maintaining good harmonic characteristics, and the proposed step wave delay update strategy can avoid error pulse and has little impact on the output of NL-PWM. |
| first_indexed | 2024-12-22T13:28:47Z |
| format | Article |
| id | doaj.art-afa9608f49474efcbf750356d1fce03f |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-22T13:28:47Z |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-afa9608f49474efcbf750356d1fce03f2022-12-21T18:24:15ZengIEEEIEEE Access2169-35362021-01-019528605287110.1109/ACCESS.2021.30706619393873The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM ModulationJie Mu0https://orcid.org/0000-0001-6300-9676Zhixuan He1https://orcid.org/0000-0002-6764-8085Yonghai Xu2https://orcid.org/0000-0002-5619-8920Xueyin Zhang3https://orcid.org/0000-0001-8061-750XYunbo Long4https://orcid.org/0000-0002-2846-5040State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, ChinaNanjing NR Electric Company Ltd., Nanjing, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, ChinaThere is a wide application prospect of Nearest level pulse width modulation (NL-PWM) in cascaded H-bridge (CHB) converter, however, it will produce narrow- and error-pulse in the process of implementation, which has a negative impact on CHB efficiency, output voltage quality and safe operation of power devices. In this paper, the NL-PWM strategy is improved based on <italic>round</italic> function to solve the narrow pulse of traditional NL-PWM, and a step wave delay update strategy is proposed to solve the error-pulse of NL-PWM. This paper analyzes the basic principle of improved NL-PWM and its ability to avoid narrow pulse of power device, shows the harmonic characteristics of improved NL-PWM, analyzes the generation mechanism of error pulse, and calculates the error of output voltage caused by the proposed step wave delay update strategy. The correctness of theoretical analysis and the effectiveness of the proposed method are verified by simulation and experiment. The research shows that the improved NL-PWM can effectively prevent narrow pulse while maintaining good harmonic characteristics, and the proposed step wave delay update strategy can avoid error pulse and has little impact on the output of NL-PWM.https://ieeexplore.ieee.org/document/9393873/Cascade H-bridgeNL-PWMerror pulsenarrow pulseharmonic characteristics |
| spellingShingle | Jie Mu Zhixuan He Yonghai Xu Xueyin Zhang Yunbo Long The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation IEEE Access Cascade H-bridge NL-PWM error pulse narrow pulse harmonic characteristics |
| title | The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation |
| title_full | The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation |
| title_fullStr | The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation |
| title_full_unstemmed | The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation |
| title_short | The Generation Mechanism and Elimination Strategy of Narrow- and Error-Pulse for Cascaded H-Bridge NL-PWM Modulation |
| title_sort | generation mechanism and elimination strategy of narrow and error pulse for cascaded h bridge nl pwm modulation |
| topic | Cascade H-bridge NL-PWM error pulse narrow pulse harmonic characteristics |
| url | https://ieeexplore.ieee.org/document/9393873/ |
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