Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback

Min Huang; Xiongfei Wang; Poh Chiang Loh; Frede Blaabjerg

doi:10.1109/APEC.2015.7104763

Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback

Min Huang, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg

AAU Energy

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

10 Citations (Scopus)

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Abstract

The LLCL-filter is emerging into grid-connected converters due to a smaller size compared to the conventional the LCL-filter. Similar to LCL-filter, the high order resonance introduces potential instability to the overall system which should be properly damped either passively or actively. In this paper, different feedback coefficients like the proportional, derivative, integral, high pass and low pass feedback coefficients of the filter capacitor current and the LC-trap circuit voltage are investigated for damping the filter resonance. Active damping methods are analyzed by using the concept of the equivalent impedance with and without the delay effect of an LLCL-filter based grid-connected inverter. Their corresponding equivalent circuits for the purpose of resonance damping are given to identify whether the feedback coefficient should be negative or positive for the different state-feedback methods. Then the stability of the different methods and the design of the feedback coefficient are analyzed and compared using root loci. Finally, experimental results are presented to validate the theoretical analysis.

Original language	English
Title of host publication	Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)
Number of pages	8
Publisher	IEEE Press
Publication date	Mar 2015
Pages	2903-2910
ISBN (Electronic)	978-1-4799-6735-3
DOIs	https://doi.org/10.1109/APEC.2015.7104763
Publication status	Published - Mar 2015
Event	30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015 - Charlotte, United States Duration: 15 Mar 2015 → 19 Mar 2015

Conference

Conference	30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015
Country/Territory	United States
City	Charlotte
Period	15/03/2015 → 19/03/2015

Series	I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings
ISSN	1048-2334

Keywords

Active damping
LLCL-filter
Delay
Grid-side current control
Grid-connected converter
Iimpedance-based design

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10.1109/APEC.2015.7104763

Active Damping of LLCL-filter Resonance Based on LC-Trap Voltage and Capacitor Current FeedbackSubmitted manuscript, 1.49 MB

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{9faa6d13d1044364b4648932c2eb829d,

title = "Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback",

abstract = "The LLCL-filter is emerging into grid-connected converters due to a smaller size compared to the conventional the LCL-filter. Similar to LCL-filter, the high order resonance introduces potential instability to the overall system which should be properly damped either passively or actively. In this paper, different feedback coefficients like the proportional, derivative, integral, high pass and low pass feedback coefficients of the filter capacitor current and the LC-trap circuit voltage are investigated for damping the filter resonance. Active damping methods are analyzed by using the concept of the equivalent impedance with and without the delay effect of an LLCL-filter based grid-connected inverter. Their corresponding equivalent circuits for the purpose of resonance damping are given to identify whether the feedback coefficient should be negative or positive for the different state-feedback methods. Then the stability of the different methods and the design of the feedback coefficient are analyzed and compared using root loci. Finally, experimental results are presented to validate the theoretical analysis.",

keywords = "Active damping , LLCL-filter, Delay, Grid-side current control, Grid-connected converter , Iimpedance-based design",

author = "Min Huang and Xiongfei Wang and Loh, {Poh Chiang} and Frede Blaabjerg",

year = "2015",

month = mar,

doi = "10.1109/APEC.2015.7104763",

language = "English",

series = "I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings",

publisher = "IEEE Press",

pages = "2903--2910",

booktitle = "Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)",

note = "30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015, IEEE APEC 2015 ; Conference date: 15-03-2015 Through 19-03-2015",

}

Huang, M, Wang, X, Loh, PC & Blaabjerg, F 2015, Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback. in Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press, I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings, pp. 2903-2910, 30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015, Charlotte, United States, 15/03/2015. https://doi.org/10.1109/APEC.2015.7104763

Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback. / Huang, Min; Wang, Xiongfei; Loh, Poh Chiang et al.
Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press, 2015. p. 2903-2910 (I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings).

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

TY - GEN

T1 - Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback

AU - Huang, Min

AU - Wang, Xiongfei

AU - Loh, Poh Chiang

AU - Blaabjerg, Frede

PY - 2015/3

Y1 - 2015/3

N2 - The LLCL-filter is emerging into grid-connected converters due to a smaller size compared to the conventional the LCL-filter. Similar to LCL-filter, the high order resonance introduces potential instability to the overall system which should be properly damped either passively or actively. In this paper, different feedback coefficients like the proportional, derivative, integral, high pass and low pass feedback coefficients of the filter capacitor current and the LC-trap circuit voltage are investigated for damping the filter resonance. Active damping methods are analyzed by using the concept of the equivalent impedance with and without the delay effect of an LLCL-filter based grid-connected inverter. Their corresponding equivalent circuits for the purpose of resonance damping are given to identify whether the feedback coefficient should be negative or positive for the different state-feedback methods. Then the stability of the different methods and the design of the feedback coefficient are analyzed and compared using root loci. Finally, experimental results are presented to validate the theoretical analysis.

AB - The LLCL-filter is emerging into grid-connected converters due to a smaller size compared to the conventional the LCL-filter. Similar to LCL-filter, the high order resonance introduces potential instability to the overall system which should be properly damped either passively or actively. In this paper, different feedback coefficients like the proportional, derivative, integral, high pass and low pass feedback coefficients of the filter capacitor current and the LC-trap circuit voltage are investigated for damping the filter resonance. Active damping methods are analyzed by using the concept of the equivalent impedance with and without the delay effect of an LLCL-filter based grid-connected inverter. Their corresponding equivalent circuits for the purpose of resonance damping are given to identify whether the feedback coefficient should be negative or positive for the different state-feedback methods. Then the stability of the different methods and the design of the feedback coefficient are analyzed and compared using root loci. Finally, experimental results are presented to validate the theoretical analysis.

KW - Active damping

KW - LLCL-filter

KW - Delay

KW - Grid-side current control

KW - Grid-connected converter

KW - Iimpedance-based design

U2 - 10.1109/APEC.2015.7104763

DO - 10.1109/APEC.2015.7104763

M3 - Article in proceeding

T3 - I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings

SP - 2903

EP - 2910

BT - Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

PB - IEEE Press

T2 - 30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015

Y2 - 15 March 2015 through 19 March 2015

ER -

Huang M, Wang X, Loh PC, Blaabjerg F. Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback. In Proceedings of the 2015 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press. 2015. p. 2903-2910. (I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings). doi: 10.1109/APEC.2015.7104763

Active damping of LLCL-filter resonance based on LC-trap voltage and capacitor current feedback

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

Cite this