Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads
The conventional control method for a single-phase cascaded H-bridge (CHB) multilevel converter is vector (dq) control; however, dq control requires complicated calculations and additional time delays. This paper presents a novel power control strategy for the CHB multilevel converter. A power-based...
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| Format: | Article |
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MDPI AG
2018-09-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/9/2435 |
| _version_ | 1798040239985393664 |
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| author | Daliang Yang Li Yin Shengguang Xu Ning Wu |
| author_facet | Daliang Yang Li Yin Shengguang Xu Ning Wu |
| author_sort | Daliang Yang |
| collection | DOAJ |
| description | The conventional control method for a single-phase cascaded H-bridge (CHB) multilevel converter is vector (dq) control; however, dq control requires complicated calculations and additional time delays. This paper presents a novel power control strategy for the CHB multilevel converter. A power-based dc-link voltage balance control is also proposed for unbalanced load conditions. The new control method is designed in a virtual αβ stationary reference frame without coordinate transformation or phase-locked loop (PLL) to avoid the potential issues related to computational complexity. Because only imaginary voltage construction is needed in the proposed control method, the time delay from conventional imaginary current construction can be eliminated. The proposed method can obtain a sinusoidal grid current waveform with unity power factor. Compared with the conventional dq control method, the power control strategy possesses the advantage of a fast dynamic response. The stability of the closed-loop system with the dc-link voltage balance controller is evaluated. Simulation and experimental results are presented to verify the accuracy of the proposed power and voltage control method. |
| first_indexed | 2024-04-11T22:04:43Z |
| format | Article |
| id | doaj.art-065abec56e29453dbba19076f0af0ff0 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:04:43Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-065abec56e29453dbba19076f0af0ff02022-12-22T04:00:44ZengMDPI AGEnergies1996-10732018-09-01119243510.3390/en11092435en11092435Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced LoadsDaliang Yang0Li Yin1Shengguang Xu2Ning Wu3College of Electrical Engineering, Guangxi University, Nanning 530004, ChinaCollege of Electrical Engineering, Guangxi University, Nanning 530004, ChinaLiuzhou Power Supply Bureau, Gxuangxi Power Grid Corporation, Liuzhou 545005, ChinaElectric Power Research Institute, Guangxi Power Grid Corporation, Nanning 530023, ChinaThe conventional control method for a single-phase cascaded H-bridge (CHB) multilevel converter is vector (dq) control; however, dq control requires complicated calculations and additional time delays. This paper presents a novel power control strategy for the CHB multilevel converter. A power-based dc-link voltage balance control is also proposed for unbalanced load conditions. The new control method is designed in a virtual αβ stationary reference frame without coordinate transformation or phase-locked loop (PLL) to avoid the potential issues related to computational complexity. Because only imaginary voltage construction is needed in the proposed control method, the time delay from conventional imaginary current construction can be eliminated. The proposed method can obtain a sinusoidal grid current waveform with unity power factor. Compared with the conventional dq control method, the power control strategy possesses the advantage of a fast dynamic response. The stability of the closed-loop system with the dc-link voltage balance controller is evaluated. Simulation and experimental results are presented to verify the accuracy of the proposed power and voltage control method.http://www.mdpi.com/1996-1073/11/9/2435cascaded H-bridge (CHB)dc-link voltage balance controlmultilevel converterpower controlsingle-phase system |
| spellingShingle | Daliang Yang Li Yin Shengguang Xu Ning Wu Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads Energies cascaded H-bridge (CHB) dc-link voltage balance control multilevel converter power control single-phase system |
| title | Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads |
| title_full | Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads |
| title_fullStr | Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads |
| title_full_unstemmed | Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads |
| title_short | Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads |
| title_sort | power and voltage control for single phase cascaded h bridge multilevel converters under unbalanced loads |
| topic | cascaded H-bridge (CHB) dc-link voltage balance control multilevel converter power control single-phase system |
| url | http://www.mdpi.com/1996-1073/11/9/2435 |
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