Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters

Zhen Xin; Xiongfei Wang; Poh Chiang Loh; Frede Blaabjerg

doi:10.1109/ECCE.2015.7310328

Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters

Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg

AAU Energy

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

6 Citations (Scopus)

Abstract

The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current feedback loop, which is based on the second-order generalized integrator, instead of a proportional gain, which can effectively mitigate the detrimental effect of the time delay. Robustness of the proposed method against grid inductance variation is proved by z-domain and s-domain analyses. Finally, experimental results validate the effectiveness of the proposed method on a three-phase grid-connected converter.

Original language	English
Title of host publication	Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages	8
Publisher	IEEE Press
Publication date	Sept 2015
Pages	4729-4736
ISBN (Print)	978-1-4673-7151-3
DOIs	https://doi.org/10.1109/ECCE.2015.7310328
Publication status	Published - Sept 2015
Event	2015 IEEE Energy Conversion Congress and Exposition (ECCE) - Montreal, Canada Duration: 20 Sept 2015 → 24 Sept 2015

Conference

Conference	2015 IEEE Energy Conversion Congress and Exposition (ECCE)
Country/Territory	Canada
City	Montreal
Period	20/09/2015 → 24/09/2015

Keywords

Capacitor current
Active damping
Grid inductance variation
Stability
Second-order generalized integrator
Power electronics
Voltage-source converter

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10.1109/ECCE.2015.7310328

AUB Link

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HARMONY: HARMONY - Harmonic identification, mitigation and control in power electronics based power systems
Blaabjerg, F., Bak, C. L., Wang, X., Beres, R. N., Kwon, J., Gui, Y., Yoon, C. & Ebrahimzadeh, E.
European Research Counsil
01/02/2013 → 28/02/2018
Project: Research

Cite this

@inproceedings{455da5b52ecc47c89741c0ae37031faa,

title = "Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters",

abstract = "The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current feedback loop, which is based on the second-order generalized integrator, instead of a proportional gain, which can effectively mitigate the detrimental effect of the time delay. Robustness of the proposed method against grid inductance variation is proved by z-domain and s-domain analyses. Finally, experimental results validate the effectiveness of the proposed method on a three-phase grid-connected converter.",

keywords = "Capacitor current, Active damping, Grid inductance variation, Stability, Second-order generalized integrator , Power electronics, Voltage-source converter",

author = "Zhen Xin and Xiongfei Wang and Loh, {Poh Chiang} and Frede Blaabjerg",

year = "2015",

month = sep,

doi = "10.1109/ECCE.2015.7310328",

language = "English",

isbn = "978-1-4673-7151-3",

pages = "4729--4736",

booktitle = "Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE)",

publisher = "IEEE Press",

note = "2015 IEEE Energy Conversion Congress and Exposition (ECCE) ; Conference date: 20-09-2015 Through 24-09-2015",

}

Xin, Z, Wang, X, Loh, PC & Blaabjerg, F 2015, Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters. in Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE Press, pp. 4729-4736, 2015 IEEE Energy Conversion Congress and Exposition (ECCE), Montreal, Canada, 20/09/2015. https://doi.org/10.1109/ECCE.2015.7310328

Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters. / Xin, Zhen; Wang, Xiongfei; Loh, Poh Chiang et al.
Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE Press, 2015. p. 4729-4736.

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

TY - GEN

T1 - Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters

AU - Xin, Zhen

AU - Wang, Xiongfei

AU - Loh, Poh Chiang

AU - Blaabjerg, Frede

PY - 2015/9

Y1 - 2015/9

N2 - The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current feedback loop, which is based on the second-order generalized integrator, instead of a proportional gain, which can effectively mitigate the detrimental effect of the time delay. Robustness of the proposed method against grid inductance variation is proved by z-domain and s-domain analyses. Finally, experimental results validate the effectiveness of the proposed method on a three-phase grid-connected converter.

AB - The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current feedback loop, which is based on the second-order generalized integrator, instead of a proportional gain, which can effectively mitigate the detrimental effect of the time delay. Robustness of the proposed method against grid inductance variation is proved by z-domain and s-domain analyses. Finally, experimental results validate the effectiveness of the proposed method on a three-phase grid-connected converter.

KW - Capacitor current

KW - Active damping

KW - Grid inductance variation

KW - Stability

KW - Second-order generalized integrator

KW - Power electronics

KW - Voltage-source converter

U2 - 10.1109/ECCE.2015.7310328

DO - 10.1109/ECCE.2015.7310328

M3 - Article in proceeding

SN - 978-1-4673-7151-3

SP - 4729

EP - 4736

BT - Proceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE)

PB - IEEE Press

T2 - 2015 IEEE Energy Conversion Congress and Exposition (ECCE)

Y2 - 20 September 2015 through 24 September 2015

ER -

Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters

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HARMONY: HARMONY - Harmonic identification, mitigation and control in power electronics based power systems

Cite this