Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter
With the increasing power level of wind power generation system, the traditional topology of power converters can no longer meets the demand of high-power wind power generation systems due to the limitation of device performance. The line voltage cascade type multiple PWM converter (LVC-VSC) is a ki...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/10/24/3059 |
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| author | Zhiqiang Wang Sheng Hao Dongyang Han Xuefeng Jin Xin Gu |
| author_facet | Zhiqiang Wang Sheng Hao Dongyang Han Xuefeng Jin Xin Gu |
| author_sort | Zhiqiang Wang |
| collection | DOAJ |
| description | With the increasing power level of wind power generation system, the traditional topology of power converters can no longer meets the demand of high-power wind power generation systems due to the limitation of device performance. The line voltage cascade type multiple PWM converter (LVC-VSC) is a kind of converter that uses the traditional two-level and six-switch voltage source converter as the basic component unit, and each unit is combined with the line voltage cascade method. This type of converter is suitable for medium-voltage and high-power applications such as wind power generation and metallurgical drives because of its easy modularization, strong scalability and low number of isolated power supplies required. However, for medium-voltage and high-power applications, the switching frequency of power devices in the converter is low, usually limited to a few hundred hertz. The traditional modulation method of line voltage cascade converter has a large number of redundant states, and simply reducing the carrier ratio will cause serious degradation of control performance and system instability. To address this problem, this paper proposes a modulation strategy and a corresponding control method for low switching frequency. The modulation strategy is based on the vector relationship of finite switching states, and the optimal switching sequence is selected according to the modulation system by removing redundant states, thus ensuring the application of different modulation sequences under different modulation depths and ensuring the current quality on the basis of the minimum switching frequency, which effectively solves the control problems at low switching frequency. The experimental results show the correctness and effectiveness of the proposed modulation strategy and control method. |
| first_indexed | 2024-03-10T04:15:56Z |
| format | Article |
| id | doaj.art-5addd227f67b487fbe95a6d4f7a249db |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-10T04:15:56Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-5addd227f67b487fbe95a6d4f7a249db2023-11-23T08:01:33ZengMDPI AGElectronics2079-92922021-12-011024305910.3390/electronics10243059Low Switching Frequency Operation Control of Line Voltage Cascade Triple ConverterZhiqiang Wang0Sheng Hao1Dongyang Han2Xuefeng Jin3Xin Gu4School of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaSchool of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaSchool of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaSchool of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaSchool of Electrical Engineering, Tiangong University, Tianjin 300387, ChinaWith the increasing power level of wind power generation system, the traditional topology of power converters can no longer meets the demand of high-power wind power generation systems due to the limitation of device performance. The line voltage cascade type multiple PWM converter (LVC-VSC) is a kind of converter that uses the traditional two-level and six-switch voltage source converter as the basic component unit, and each unit is combined with the line voltage cascade method. This type of converter is suitable for medium-voltage and high-power applications such as wind power generation and metallurgical drives because of its easy modularization, strong scalability and low number of isolated power supplies required. However, for medium-voltage and high-power applications, the switching frequency of power devices in the converter is low, usually limited to a few hundred hertz. The traditional modulation method of line voltage cascade converter has a large number of redundant states, and simply reducing the carrier ratio will cause serious degradation of control performance and system instability. To address this problem, this paper proposes a modulation strategy and a corresponding control method for low switching frequency. The modulation strategy is based on the vector relationship of finite switching states, and the optimal switching sequence is selected according to the modulation system by removing redundant states, thus ensuring the application of different modulation sequences under different modulation depths and ensuring the current quality on the basis of the minimum switching frequency, which effectively solves the control problems at low switching frequency. The experimental results show the correctness and effectiveness of the proposed modulation strategy and control method.https://www.mdpi.com/2079-9292/10/24/3059triple line voltage cascade converterlow switching frequencyswitching sequencemodulation depth |
| spellingShingle | Zhiqiang Wang Sheng Hao Dongyang Han Xuefeng Jin Xin Gu Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter Electronics triple line voltage cascade converter low switching frequency switching sequence modulation depth |
| title | Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter |
| title_full | Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter |
| title_fullStr | Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter |
| title_full_unstemmed | Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter |
| title_short | Low Switching Frequency Operation Control of Line Voltage Cascade Triple Converter |
| title_sort | low switching frequency operation control of line voltage cascade triple converter |
| topic | triple line voltage cascade converter low switching frequency switching sequence modulation depth |
| url | https://www.mdpi.com/2079-9292/10/24/3059 |
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