Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique
In terms of the single-phase flyback photovoltaic micro-inverters, the traditional discontinuous current mode algorithm takes the disadvantages of large phase delay between the grid-connected current and voltage, and high harmonics of grid-connected current. Therefore, this paper proposes a grid-...
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Harbin University of Science and Technology Publications
2023-12-01
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| Series: | Journal of Harbin University of Science and Technology |
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| Online Access: | https://hlgxb.hrbust.edu.cn/#/digest?ArticleID=2278 |
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| author | MA Chen cheng YU Feng WU Xiao xin MAO Jing feng |
| author_facet | MA Chen cheng YU Feng WU Xiao xin MAO Jing feng |
| author_sort | MA Chen cheng |
| collection | DOAJ |
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In terms of the single-phase flyback photovoltaic micro-inverters, the traditional discontinuous current mode algorithm takes the disadvantages of large phase delay between the grid-connected current and voltage, and high harmonics of grid-connected current. Therefore, this paper proposes a grid-connected control strategy with a lag-time compensation technique for the single-phase flyback inverter. First, the small signal model of the system is established to obtain the two components in the grid-connected current model, namely, steady-state quantity and transient quantity. Out of them, the steady-state quantity is responsible for calculating the steady-state duty cycle, while the transient quantity is for the transient duty cycle. The final duty cycle applied to the inverter is the superposition of the two duty cycles. Thereafter, in order to compensate the lag-time problem of control signal owing to the data acquisition and numerical calculation, a weighted transfer function is designed to minimize the phase difference between the output grid- connected current and the grid voltage, thus ensuring the high stability of the single-phase flyback micro-inverter. Finally, the tests based on the 150 W experimental prototype verify the effectiveness of the proposed method. |
| format | Article |
| id | doaj-art-40dbd2d2f36e47c4a68b5907d6497ff6 |
| institution | Kabale University |
| issn | 1007-2683 |
| language | zho |
| publishDate | 2023-12-01 |
| publisher | Harbin University of Science and Technology Publications |
| record_format | Article |
| series | Journal of Harbin University of Science and Technology |
| spelling | doaj-art-40dbd2d2f36e47c4a68b5907d6497ff62025-08-20T03:50:58ZzhoHarbin University of Science and Technology PublicationsJournal of Harbin University of Science and Technology1007-26832023-12-012806677510.15938/j.jhust.2023.06.008Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation TechniqueMA Chen cheng0YU Feng1WU Xiao xin2MAO Jing feng3School of Electrical Engineering, Nantong University, Nantong 226019 , ChinaSchool of Electrical Engineering, Nantong University, Nantong 226019 , ChinaSchool of Electrical Engineering, Nantong University, Nantong 226019 , ChinaSchool of Electrical Engineering, Nantong University, Nantong 226019 , China In terms of the single-phase flyback photovoltaic micro-inverters, the traditional discontinuous current mode algorithm takes the disadvantages of large phase delay between the grid-connected current and voltage, and high harmonics of grid-connected current. Therefore, this paper proposes a grid-connected control strategy with a lag-time compensation technique for the single-phase flyback inverter. First, the small signal model of the system is established to obtain the two components in the grid-connected current model, namely, steady-state quantity and transient quantity. Out of them, the steady-state quantity is responsible for calculating the steady-state duty cycle, while the transient quantity is for the transient duty cycle. The final duty cycle applied to the inverter is the superposition of the two duty cycles. Thereafter, in order to compensate the lag-time problem of control signal owing to the data acquisition and numerical calculation, a weighted transfer function is designed to minimize the phase difference between the output grid- connected current and the grid voltage, thus ensuring the high stability of the single-phase flyback micro-inverter. Finally, the tests based on the 150 W experimental prototype verify the effectiveness of the proposed method.https://hlgxb.hrbust.edu.cn/#/digest?ArticleID=2278photovoltaicpowergenerationsingle-phaseflybackmicro-invertergrid-connectedcontrollag-timediscontinuouscurrentmode |
| spellingShingle | MA Chen cheng YU Feng WU Xiao xin MAO Jing feng Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique Journal of Harbin University of Science and Technology photovoltaicpowergeneration single-phaseflybackmicro-inverter grid-connectedcontrol lag-time discontinuouscurrentmode |
| title | Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique |
| title_full | Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique |
| title_fullStr | Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique |
| title_full_unstemmed | Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique |
| title_short | Single-phase Flyback Photovoltaic Micro-inverter Grid-connected Control Strategy with a Lag-time Compensation Technique |
| title_sort | single phase flyback photovoltaic micro inverter grid connected control strategy with a lag time compensation technique |
| topic | photovoltaicpowergeneration single-phaseflybackmicro-inverter grid-connectedcontrol lag-time discontinuouscurrentmode |
| url | https://hlgxb.hrbust.edu.cn/#/digest?ArticleID=2278 |
| work_keys_str_mv | AT machencheng singlephaseflybackphotovoltaicmicroinvertergridconnectedcontrolstrategywithalagtimecompensationtechnique AT yufeng singlephaseflybackphotovoltaicmicroinvertergridconnectedcontrolstrategywithalagtimecompensationtechnique AT wuxiaoxin singlephaseflybackphotovoltaicmicroinvertergridconnectedcontrolstrategywithalagtimecompensationtechnique AT maojingfeng singlephaseflybackphotovoltaicmicroinvertergridconnectedcontrolstrategywithalagtimecompensationtechnique |