Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions
In a three-phase three-level ac/dc converter, the T-type rectifier features high efficiency and lower power switch stress, and it allows the dc-side voltage to serve as two independent output voltage sources. In practical applications, the operation of the T-type rectifier under unbalance...
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| Format: | Article |
| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of the Industrial Electronics Society |
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| Online Access: | https://ieeexplore.ieee.org/document/10918756/ |
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| author | Yi-Hung Liao Jia-Sheng Liu Pu-Yi Huang Ping-Ju Chen |
| author_facet | Yi-Hung Liao Jia-Sheng Liu Pu-Yi Huang Ping-Ju Chen |
| author_sort | Yi-Hung Liao |
| collection | DOAJ |
| description | In a three-phase three-level ac/dc converter, the T-type rectifier features high efficiency and lower power switch stress, and it allows the dc-side voltage to serve as two independent output voltage sources. In practical applications, the operation of the T-type rectifier under unbalanced three-phase grid conditions must be considered. This article establishes an improved direct power control structure based on extended power theory under unbalanced grid conditions to achieve distortion-free current for the T-type rectifier. Additionally, a feedforward virtual capacitor power compensation is created to eliminate the output voltage ripples caused by the ripple power of the rectifier inductance under the unbalanced three-phase grid. The controller design of the improved direct power control and the choice of the virtual capacitor are analyzed. Furthermore, the proposed method regulates the neutral point voltage of the T-type rectifier, eliminates neutral point current disturbances, and provides a stable and accurate dc output voltage, ensuring high quality power supply. The proposed strategy does not require a phase-locked loop or ac-side system parameters, resulting in excellent dynamic performance and robustness against parameter mismatches. Finally, the effectiveness and feasibility of the proposed control strategy are verified through simulation results and the implementation of a 2.4 kW three-phase T-type rectifier. |
| format | Article |
| id | doaj-art-5f7d359e8dac449a8f6a91db80325877 |
| institution | Kabale University |
| issn | 2644-1284 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Industrial Electronics Society |
| spelling | doaj-art-5f7d359e8dac449a8f6a91db803258772025-08-20T03:42:06ZengIEEEIEEE Open Journal of the Industrial Electronics Society2644-12842025-01-01642944410.1109/OJIES.2025.354947510918756Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid ConditionsYi-Hung Liao0https://orcid.org/0000-0003-4575-8563Jia-Sheng Liu1https://orcid.org/0009-0003-9562-6806Pu-Yi Huang2Ping-Ju Chen3Department of Electrical Engineering, National Central University, Taoyuan, TaiwanDepartment of Electrical Engineering, National Central University, Taoyuan, TaiwanDepartment of Electrical Engineering, National Central University, Taoyuan, TaiwanDepartment of Electrical Engineering, National Central University, Taoyuan, TaiwanIn a three-phase three-level ac/dc converter, the T-type rectifier features high efficiency and lower power switch stress, and it allows the dc-side voltage to serve as two independent output voltage sources. In practical applications, the operation of the T-type rectifier under unbalanced three-phase grid conditions must be considered. This article establishes an improved direct power control structure based on extended power theory under unbalanced grid conditions to achieve distortion-free current for the T-type rectifier. Additionally, a feedforward virtual capacitor power compensation is created to eliminate the output voltage ripples caused by the ripple power of the rectifier inductance under the unbalanced three-phase grid. The controller design of the improved direct power control and the choice of the virtual capacitor are analyzed. Furthermore, the proposed method regulates the neutral point voltage of the T-type rectifier, eliminates neutral point current disturbances, and provides a stable and accurate dc output voltage, ensuring high quality power supply. The proposed strategy does not require a phase-locked loop or ac-side system parameters, resulting in excellent dynamic performance and robustness against parameter mismatches. Finally, the effectiveness and feasibility of the proposed control strategy are verified through simulation results and the implementation of a 2.4 kW three-phase T-type rectifier.https://ieeexplore.ieee.org/document/10918756/Direct power controlextended power theorypower ripple compensationtotal harmonic distortion (THD)unbalanced three-phase gridvirtual capacitor power |
| spellingShingle | Yi-Hung Liao Jia-Sheng Liu Pu-Yi Huang Ping-Ju Chen Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions IEEE Open Journal of the Industrial Electronics Society Direct power control extended power theory power ripple compensation total harmonic distortion (THD) unbalanced three-phase grid virtual capacitor power |
| title | Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions |
| title_full | Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions |
| title_fullStr | Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions |
| title_full_unstemmed | Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions |
| title_short | Improved Direct Power Control of T-Type Rectifiers With Parameter Robustness Feedforward Compensation for DC-Bus Voltage Ripple Suppression Under Unbalanced Grid Conditions |
| title_sort | improved direct power control of t type rectifiers with parameter robustness feedforward compensation for dc bus voltage ripple suppression under unbalanced grid conditions |
| topic | Direct power control extended power theory power ripple compensation total harmonic distortion (THD) unbalanced three-phase grid virtual capacitor power |
| url | https://ieeexplore.ieee.org/document/10918756/ |
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