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Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications

Phuong Vu, Quan Nguyen, Minh Tran, Grazia Todeschini, Surya Santoso

IET Power Electronics, Volume: 11, Issue: 14, Pages: 2346 - 2354

Swansea University Author: Grazia Todeschini

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DOI (Published version): 10.1049/iet-pel.2018.5763

Abstract

Z-source inverters (ZSIs) are single-stage power converters with both voltage buck and boost capabilities provided by the unique impedance network and the ability to operate during shoot-through states. This study proposes a novel non-linear adaptive backstepping method for dc-side controllers in a...

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Published in: IET Power Electronics
ISSN: 1755-4535 1755-4543
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa45161
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spelling 2019-07-29T14:43:51.7370564 v2 45161 2018-10-24 Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications c4ff9050b31bdec0e560b19bfb3b56d3 Grazia Todeschini Grazia Todeschini true false 2018-10-24 FGSEN Z-source inverters (ZSIs) are single-stage power converters with both voltage buck and boost capabilities provided by the unique impedance network and the ability to operate during shoot-through states. This study proposes a novel non-linear adaptive backstepping method for dc-side controllers in a multi-loop control scheme of the ZSI in grid-tied photovoltaic (PV) systems. Despite the variability of the capacitor and inductor values in the ZSI impedance network, the proposed controller guarantees robust and stable operation under varying levels of PV irradiance and temperature. The shoot-through duty ratio of the ZSI is obtained directly from the output of an MPPT algorithm and the measured PV and inductor currents. This strategy overcomes the disadvantages of the conventional approach such as the non-minimum phase at the dc side of the ZSI. It also eliminates the need to linearise the voltage/current characteristics of the PV arrays and ZSI model. The ac-side controllers consist of an outer proportional–integral voltage controller and an inner deadbeat current controller to achieve unity power factor and stable capacitor voltage in spite of grid voltage fluctuations. The efficacy of the proposed adaptive backstepping controller and the multi-loop control scheme is validated by offline and hardware-in-the-loop real-time simulations. Journal Article IET Power Electronics 11 14 2346 2354 1755-4535 1755-4543 control nonlinearities; robust control; power grids; power generation control; closed loop systems; adaptive control; power factor; photovoltaic power systems; voltage control; control system synthesis; maximum power point trackers; nonlinear control systems; PI control; electric current control; invertors 31 12 2018 2018-12-31 10.1049/iet-pel.2018.5763 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-07-29T14:43:51.7370564 2018-10-24T08:17:55.3057206 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Phuong Vu 1 Quan Nguyen 2 Minh Tran 3 Grazia Todeschini 4 Surya Santoso 5 0045161-24102018082015.pdf Vu2018.pdf 2018-10-24T08:20:15.7770000 Output 6342305 application/pdf Accepted Manuscript true 2018-10-24T00:00:00.0000000 true eng
title Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
spellingShingle Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
Grazia Todeschini
title_short Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
title_full Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
title_fullStr Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
title_full_unstemmed Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
title_sort Adaptive backstepping approach for dc-side controllers of Z-source inverters in grid-tied PV system applications
author_id_str_mv c4ff9050b31bdec0e560b19bfb3b56d3
author_id_fullname_str_mv c4ff9050b31bdec0e560b19bfb3b56d3_***_Grazia Todeschini
author Grazia Todeschini
author2 Phuong Vu
Quan Nguyen
Minh Tran
Grazia Todeschini
Surya Santoso
format Journal article
container_title IET Power Electronics
container_volume 11
container_issue 14
container_start_page 2346
publishDate 2018
institution Swansea University
issn 1755-4535
1755-4543
doi_str_mv 10.1049/iet-pel.2018.5763
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Z-source inverters (ZSIs) are single-stage power converters with both voltage buck and boost capabilities provided by the unique impedance network and the ability to operate during shoot-through states. This study proposes a novel non-linear adaptive backstepping method for dc-side controllers in a multi-loop control scheme of the ZSI in grid-tied photovoltaic (PV) systems. Despite the variability of the capacitor and inductor values in the ZSI impedance network, the proposed controller guarantees robust and stable operation under varying levels of PV irradiance and temperature. The shoot-through duty ratio of the ZSI is obtained directly from the output of an MPPT algorithm and the measured PV and inductor currents. This strategy overcomes the disadvantages of the conventional approach such as the non-minimum phase at the dc side of the ZSI. It also eliminates the need to linearise the voltage/current characteristics of the PV arrays and ZSI model. The ac-side controllers consist of an outer proportional–integral voltage controller and an inner deadbeat current controller to achieve unity power factor and stable capacitor voltage in spite of grid voltage fluctuations. The efficacy of the proposed adaptive backstepping controller and the multi-loop control scheme is validated by offline and hardware-in-the-loop real-time simulations.
published_date 2018-12-31T03:56:48Z
_version_ 1763752866177089536
score 11.035874

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