Grid-connected Photovoltaic Micro-inverter with New Hybrid Control LLC Resonant Converter

Mao Xingkui; Huang Qisheng; Ke Qingbo; Xiao Yudi; Zhe Zhang; Michael A. E. Andersen

doi:10.1109/IECON.2016.7793632

Grid-connected Photovoltaic Micro-inverter with New Hybrid Control LLC Resonant Converter

Mao Xingkui, Huang Qisheng, Ke Qingbo, Xiao Yudi, Zhe Zhang, Michael A. E. Andersen

Fuzhou University

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

A high-efficiency photovoltaic (PV) micro-inverter consisting of two power stages i.e. a LLC resonant converter with a new hybrid control scheme and a dc-ac inverter is proposed, studied and designed in this paper. In the first power stage, the new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is employed on a full-bridge LLC dc-dc converter, in order to achieve high efficiency when PV output voltage varies in a wide range. Moreover, a maximum power point tracking (MPPT) method based on power perturbation is implemented in the dc-ac inverter. Therefore, the complexity of regulating LLC converter can be reduced effectively, and efficiency optimal design can be carried out through the proposed designing procedure for the resonant tank of LLC converter. Finally, a prototype of the proposed PV micro-inverter (PVMI) is developed with rated power of 250W and output voltage of 220VAC/50Hz. The experiment shows that the peak efficiency of the PVMI is 95.5%, where efficiency of LLC converter is up to 97.7%, and the MPPT accuracy is more than 99%. Thus the validity of the proposed system structure, design and control method is verified.

Original language	English
Title of host publication	Proceedings of 42nd Annual Conference of the IEEE Industrial Electronics Society
Publisher	IEEE
Publication date	2016
Pages	2319-2324
ISBN (Print)	9781509034741
DOIs	https://doi.org/10.1109/IECON.2016.7793632
Publication status	Published - 2016
Event	42nd Annual Conference of the IEEE Industrial Electronics Society - Palazzo dei Congressi Piazza Adua, Florence, Italy Duration: 23 Oct 2016 → 26 Oct 2016 Conference number: 42 https://ieeexplore.ieee.org/xpl/conhome/7782522/proceeding

Conference

Conference	42nd Annual Conference of the IEEE Industrial Electronics Society
Number	42
Location	Palazzo dei Congressi Piazza Adua
Country/Territory	Italy
City	Florence
Period	23/10/2016 → 26/10/2016
Internet address	https://ieeexplore.ieee.org/xpl/conhome/7782522/proceeding

Keywords

Photovoltaic micro-inverter
LLC resonant converter
PFM
Phase-shift PWM
MPPT

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Grid connected PhotovoltaicAccepted author manuscript, 1.81 MB

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title = "Grid-connected Photovoltaic Micro-inverter with New Hybrid Control LLC Resonant Converter",

abstract = "A high-efficiency photovoltaic (PV) micro-inverter consisting of two power stages i.e. a LLC resonant converter with a new hybrid control scheme and a dc-ac inverter is proposed, studied and designed in this paper. In the first power stage, the new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is employed on a full-bridge LLC dc-dc converter, in order to achieve high efficiency when PV output voltage varies in a wide range. Moreover, a maximum power point tracking (MPPT) method based on power perturbation is implemented in the dc-ac inverter. Therefore, the complexity of regulating LLC converter can be reduced effectively, and efficiency optimal design can be carried out through the proposed designing procedure for the resonant tank of LLC converter. Finally, a prototype of the proposed PV micro-inverter (PVMI) is developed with rated power of 250W and output voltage of 220VAC/50Hz. The experiment shows that the peak efficiency of the PVMI is 95.5%, where efficiency of LLC converter is up to 97.7%, and the MPPT accuracy is more than 99%. Thus the validity of the proposed system structure, design and control method is verified.",

keywords = "Photovoltaic micro-inverter, LLC resonant converter, PFM, Phase-shift PWM, MPPT",

author = "Mao Xingkui and Huang Qisheng and Ke Qingbo and Xiao Yudi and Zhe Zhang and Andersen, {Michael A. E.}",

year = "2016",

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publisher = "IEEE",

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note = "42nd Annual Conference of the IEEE Industrial Electronics Society, IECON 2016 ; Conference date: 23-10-2016 Through 26-10-2016",

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}

Xingkui, M, Qisheng, H, Qingbo, K, Yudi, X, Zhang, Z & Andersen, MAE 2016, Grid-connected Photovoltaic Micro-inverter with New Hybrid Control LLC Resonant Converter. in Proceedings of 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, pp. 2319-2324, 42nd Annual Conference of the IEEE Industrial Electronics Society, Florence, Italy, 23/10/2016. https://doi.org/10.1109/IECON.2016.7793632

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AU - Xingkui, Mao

AU - Qisheng, Huang

AU - Qingbo, Ke

AU - Yudi, Xiao

AU - Zhang, Zhe

AU - Andersen, Michael A. E.

N1 - Conference code: 42

PY - 2016

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N2 - A high-efficiency photovoltaic (PV) micro-inverter consisting of two power stages i.e. a LLC resonant converter with a new hybrid control scheme and a dc-ac inverter is proposed, studied and designed in this paper. In the first power stage, the new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is employed on a full-bridge LLC dc-dc converter, in order to achieve high efficiency when PV output voltage varies in a wide range. Moreover, a maximum power point tracking (MPPT) method based on power perturbation is implemented in the dc-ac inverter. Therefore, the complexity of regulating LLC converter can be reduced effectively, and efficiency optimal design can be carried out through the proposed designing procedure for the resonant tank of LLC converter. Finally, a prototype of the proposed PV micro-inverter (PVMI) is developed with rated power of 250W and output voltage of 220VAC/50Hz. The experiment shows that the peak efficiency of the PVMI is 95.5%, where efficiency of LLC converter is up to 97.7%, and the MPPT accuracy is more than 99%. Thus the validity of the proposed system structure, design and control method is verified.

AB - A high-efficiency photovoltaic (PV) micro-inverter consisting of two power stages i.e. a LLC resonant converter with a new hybrid control scheme and a dc-ac inverter is proposed, studied and designed in this paper. In the first power stage, the new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is employed on a full-bridge LLC dc-dc converter, in order to achieve high efficiency when PV output voltage varies in a wide range. Moreover, a maximum power point tracking (MPPT) method based on power perturbation is implemented in the dc-ac inverter. Therefore, the complexity of regulating LLC converter can be reduced effectively, and efficiency optimal design can be carried out through the proposed designing procedure for the resonant tank of LLC converter. Finally, a prototype of the proposed PV micro-inverter (PVMI) is developed with rated power of 250W and output voltage of 220VAC/50Hz. The experiment shows that the peak efficiency of the PVMI is 95.5%, where efficiency of LLC converter is up to 97.7%, and the MPPT accuracy is more than 99%. Thus the validity of the proposed system structure, design and control method is verified.

KW - Photovoltaic micro-inverter

KW - LLC resonant converter

KW - PFM

KW - Phase-shift PWM

KW - MPPT

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DO - 10.1109/IECON.2016.7793632

M3 - Article in proceedings

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EP - 2324

BT - Proceedings of 42nd Annual Conference of the IEEE Industrial Electronics Society

PB - IEEE

T2 - 42nd Annual Conference of the IEEE Industrial Electronics Society

Y2 - 23 October 2016 through 26 October 2016

ER -

Grid-connected Photovoltaic Micro-inverter with New Hybrid Control LLC Resonant Converter

Abstract

Conference

Keywords

UN SDGs

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