Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/22/7643 |
| _version_ | 1797510524912533504 |
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| author | Lingling Cao Jiefeng Lin Shikai Chen Yuanmao Ye |
| author_facet | Lingling Cao Jiefeng Lin Shikai Chen Yuanmao Ye |
| author_sort | Lingling Cao |
| collection | DOAJ |
| description | Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency. |
| first_indexed | 2024-03-10T05:32:40Z |
| format | Article |
| id | doaj.art-9982e908902d41ae9210ac7b3d2e9f12 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T05:32:40Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9982e908902d41ae9210ac7b3d2e9f122023-11-22T23:11:16ZengMDPI AGEnergies1996-10732021-11-011422764310.3390/en14227643Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width ModulationLingling Cao0Jiefeng Lin1Shikai Chen2Yuanmao Ye3School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, ChinaSchool of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, ChinaSchool of Automation, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Automation, Guangdong University of Technology, Guangzhou 510006, ChinaMultilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency.https://www.mdpi.com/1996-1073/14/22/7643cascaded multilevel inverterswitched-capacitorPWM modulationreactive power |
| spellingShingle | Lingling Cao Jiefeng Lin Shikai Chen Yuanmao Ye Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation Energies cascaded multilevel inverter switched-capacitor PWM modulation reactive power |
| title | Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation |
| title_full | Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation |
| title_fullStr | Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation |
| title_full_unstemmed | Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation |
| title_short | Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation |
| title_sort | symmetrical cascaded switched capacitor multilevel inverter based on hybrid pulse width modulation |
| topic | cascaded multilevel inverter switched-capacitor PWM modulation reactive power |
| url | https://www.mdpi.com/1996-1073/14/22/7643 |
| work_keys_str_mv | AT linglingcao symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation AT jiefenglin symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation AT shikaichen symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation AT yuanmaoye symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation |