Observer-based current control for converters with an LCL filter: Robust design for weak grids

F. M. Mahafugur Rahman; Usama Riaz; Jarno Kukkola; Mikko Routimo; Marko Hinkkanen

doi:10.1109/SLED.2018.8486047

Observer-based current control for converters with an LCL filter: Robust design for weak grids

F. M. Mahafugur Rahman, Usama Riaz, Jarno Kukkola, Mikko Routimo, Marko Hinkkanen

ABB Oy Drives

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

9 Citations (Scopus)

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Abstract

This paper deals with state-feedback current control for power converters, which are equipped with an LCL filter and connected to a weak grid. The grid-side current is measured and other states needed by the current controller are estimated using a reduced-order observer. The control system is designed directly in the discrete-time domain. The gains of the control system are calculated using direct pole placement, assuming a strong grid. Recommendations for the nominal pole locations are given. The results show that the control system is robust against the unknown grid impedance, ranging from strong to very-weak grid conditions. The proposed design is validated by means of experiments.

Original language	English
Title of host publication	IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018
Publisher	IEEE
Pages	36-41
Number of pages	6
ISBN (Electronic)	978-1-5386-4455-3
DOIs	https://doi.org/10.1109/SLED.2018.8486047
Publication status	Published - 13 Sept 2018
MoE publication type	A4 Conference publication
Event	IEEE International Symposium on Sensorless Control for Electrical Drives - Helsinki, Finland Duration: 13 Sept 2018 → 14 Sept 2018 Conference number: 9 http://sites.ieee.org/sled2018/

Publication series

Name	IEEE international symposium on sensorless control for electrical drives
Publisher	IEEE
ISSN (Electronic)	2166-6733

Conference

Conference	IEEE International Symposium on Sensorless Control for Electrical Drives
Abbreviated title	SLED
Country/Territory	Finland
City	Helsinki
Period	13/09/2018 → 14/09/2018
Internet address	http://sites.ieee.org/sled2018/

Keywords

grid converter
LCL filter
reduced-order observer
state-feedback current control
weak grid
observers
control system
Inductance
Integrated circuit modeling
delays
current measurement
current control

Access to Document

10.1109/SLED.2018.8486047

c85_postAccepted author manuscript, 1.18 MB

Cite this

Rahman, F. M. M., Riaz, U., Kukkola, J., Routimo, M., & Hinkkanen, M. (2018). Observer-based current control for converters with an LCL filter: Robust design for weak grids. In IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018 (pp. 36-41). (IEEE international symposium on sensorless control for electrical drives). IEEE. https://doi.org/10.1109/SLED.2018.8486047

@inproceedings{20a7a2373e03429f8627e9b8da534f79,

title = "Observer-based current control for converters with an LCL filter: Robust design for weak grids",

abstract = "This paper deals with state-feedback current control for power converters, which are equipped with an LCL filter and connected to a weak grid. The grid-side current is measured and other states needed by the current controller are estimated using a reduced-order observer. The control system is designed directly in the discrete-time domain. The gains of the control system are calculated using direct pole placement, assuming a strong grid. Recommendations for the nominal pole locations are given. The results show that the control system is robust against the unknown grid impedance, ranging from strong to very-weak grid conditions. The proposed design is validated by means of experiments.",

keywords = "grid converter, LCL filter, reduced-order observer, state-feedback current control, weak grid, observers, control system, Inductance, Integrated circuit modeling, delays, current measurement, current control",

author = "Rahman, {F. M. Mahafugur} and Usama Riaz and Jarno Kukkola and Mikko Routimo and Marko Hinkkanen",

year = "2018",

month = sep,

day = "13",

doi = "10.1109/SLED.2018.8486047",

language = "English",

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publisher = "IEEE",

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booktitle = "IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018",

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note = "IEEE International Symposium on Sensorless Control for Electrical Drives, SLED ; Conference date: 13-09-2018 Through 14-09-2018",

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}

Rahman, FMM, Riaz, U, Kukkola, J, Routimo, M & Hinkkanen, M 2018, Observer-based current control for converters with an LCL filter: Robust design for weak grids. in IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018. IEEE international symposium on sensorless control for electrical drives, IEEE, pp. 36-41, IEEE International Symposium on Sensorless Control for Electrical Drives, Helsinki, Finland, 13/09/2018. https://doi.org/10.1109/SLED.2018.8486047

Observer-based current control for converters with an LCL filter: Robust design for weak grids. / Rahman, F. M. Mahafugur; Riaz, Usama; Kukkola, Jarno et al.
IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018. IEEE, 2018. p. 36-41 (IEEE international symposium on sensorless control for electrical drives).

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

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T1 - Observer-based current control for converters with an LCL filter

T2 - IEEE International Symposium on Sensorless Control for Electrical Drives

AU - Rahman, F. M. Mahafugur

AU - Riaz, Usama

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N1 - Conference code: 9

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N2 - This paper deals with state-feedback current control for power converters, which are equipped with an LCL filter and connected to a weak grid. The grid-side current is measured and other states needed by the current controller are estimated using a reduced-order observer. The control system is designed directly in the discrete-time domain. The gains of the control system are calculated using direct pole placement, assuming a strong grid. Recommendations for the nominal pole locations are given. The results show that the control system is robust against the unknown grid impedance, ranging from strong to very-weak grid conditions. The proposed design is validated by means of experiments.

AB - This paper deals with state-feedback current control for power converters, which are equipped with an LCL filter and connected to a weak grid. The grid-side current is measured and other states needed by the current controller are estimated using a reduced-order observer. The control system is designed directly in the discrete-time domain. The gains of the control system are calculated using direct pole placement, assuming a strong grid. Recommendations for the nominal pole locations are given. The results show that the control system is robust against the unknown grid impedance, ranging from strong to very-weak grid conditions. The proposed design is validated by means of experiments.

KW - grid converter

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KW - reduced-order observer

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KW - weak grid

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KW - control system

KW - Inductance

KW - Integrated circuit modeling

KW - delays

KW - current measurement

KW - current control

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Rahman FMM, Riaz U, Kukkola J, Routimo M , Hinkkanen M. Observer-based current control for converters with an LCL filter: Robust design for weak grids. In IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018. IEEE. 2018. p. 36-41. (IEEE international symposium on sensorless control for electrical drives). doi: 10.1109/SLED.2018.8486047

Observer-based current control for converters with an LCL filter: Robust design for weak grids

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