Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters

Pei Cai; Xiaohua Wu; Yongheng Yang; Wenli Yao; Frede Blaabjerg

doi:10.1109/IECON.2018.8591089

Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters

Pei Cai, Xiaohua Wu, Yongheng Yang, Wenli Yao, Frede Blaabjerg

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

8 Citations (Scopus)

Abstract

Damping the LCL-filter resonance is an essential issue for grid-connected inverters. In most of the prior-art solutions, active damping focuses on a dual-loop architecture, e.g., using the capacitor-current to damp the resonance, thus complicating the entire control loop and/or increasing the cost. Digital filters (such as notch and all-pass filters) directly cascaded into the current controller, referred to as a single-loop scheme, are thus more economical, which feature no extra sensors and a simple open-loop scheme with easy parameter tuning. This paper proposes a practical single-loop damping method for grid-current feedback control (GCF) based on a first-order digital low-pass filter, which realizes damping by lagging the phase and meanwhile reducing the magnitude response for a sufficient gain margin. Simulations verify the proposed method.

Original language	English
Title of host publication	Proceedings of IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
Number of pages	6
Publisher	IEEE Press
Publication date	Oct 2018
Pages	6122-6127
ISBN (Print)	978-1-5090-6685-8
ISBN (Electronic)	978-1-5090-6684-1
DOIs	https://doi.org/10.1109/IECON.2018.8591089
Publication status	Published - Oct 2018
Event	44th Annual Conference of the IEEE Industrial Electronics Society - Omni Shoreham Hotel, Washington, United States Duration: 21 Oct 2018 → 23 Oct 2018 http://www.iecon2018.org/

Conference

Conference	44th Annual Conference of the IEEE Industrial Electronics Society
Location	Omni Shoreham Hotel
Country/Territory	United States
City	Washington
Period	21/10/2018 → 23/10/2018
Internet address	http://www.iecon2018.org/

Keywords

digital low-pass filter
single-loop damping
GCF
grid-connected inverters
filter-based damping

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https://ieeexplore.ieee.org/document/8591089

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@inproceedings{f61c45582465426fa408b4eff604be74,

title = "Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters",

abstract = "Damping the LCL-filter resonance is an essential issue for grid-connected inverters. In most of the prior-art solutions, active damping focuses on a dual-loop architecture, e.g., using the capacitor-current to damp the resonance, thus complicating the entire control loop and/or increasing the cost. Digital filters (such as notch and all-pass filters) directly cascaded into the current controller, referred to as a single-loop scheme, are thus more economical, which feature no extra sensors and a simple open-loop scheme with easy parameter tuning. This paper proposes a practical single-loop damping method for grid-current feedback control (GCF) based on a first-order digital low-pass filter, which realizes damping by lagging the phase and meanwhile reducing the magnitude response for a sufficient gain margin. Simulations verify the proposed method.",

keywords = "digital low-pass filter, single-loop damping, GCF, grid-connected inverters, filter-based damping",

author = "Pei Cai and Xiaohua Wu and Yongheng Yang and Wenli Yao and Frede Blaabjerg",

year = "2018",

month = oct,

doi = "10.1109/IECON.2018.8591089",

language = "English",

isbn = "978-1-5090-6685-8",

pages = "6122--6127",

booktitle = "Proceedings of IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society",

publisher = "IEEE Press",

note = "44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018 ; Conference date: 21-10-2018 Through 23-10-2018",

url = "http://www.iecon2018.org/",

}

Cai, P, Wu, X, Yang, Y, Yao, W & Blaabjerg, F 2018, Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters. in Proceedings of IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society. IEEE Press, pp. 6122-6127, 44th Annual Conference of the IEEE Industrial Electronics Society, Washington, District of Columbia, United States, 21/10/2018. https://doi.org/10.1109/IECON.2018.8591089

Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters. / Cai, Pei; Wu, Xiaohua; Yang, Yongheng et al.
Proceedings of IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society. IEEE Press, 2018. p. 6122-6127.

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

TY - GEN

T1 - Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters

AU - Cai, Pei

AU - Wu, Xiaohua

AU - Yang, Yongheng

AU - Yao, Wenli

AU - Blaabjerg, Frede

PY - 2018/10

Y1 - 2018/10

N2 - Damping the LCL-filter resonance is an essential issue for grid-connected inverters. In most of the prior-art solutions, active damping focuses on a dual-loop architecture, e.g., using the capacitor-current to damp the resonance, thus complicating the entire control loop and/or increasing the cost. Digital filters (such as notch and all-pass filters) directly cascaded into the current controller, referred to as a single-loop scheme, are thus more economical, which feature no extra sensors and a simple open-loop scheme with easy parameter tuning. This paper proposes a practical single-loop damping method for grid-current feedback control (GCF) based on a first-order digital low-pass filter, which realizes damping by lagging the phase and meanwhile reducing the magnitude response for a sufficient gain margin. Simulations verify the proposed method.

AB - Damping the LCL-filter resonance is an essential issue for grid-connected inverters. In most of the prior-art solutions, active damping focuses on a dual-loop architecture, e.g., using the capacitor-current to damp the resonance, thus complicating the entire control loop and/or increasing the cost. Digital filters (such as notch and all-pass filters) directly cascaded into the current controller, referred to as a single-loop scheme, are thus more economical, which feature no extra sensors and a simple open-loop scheme with easy parameter tuning. This paper proposes a practical single-loop damping method for grid-current feedback control (GCF) based on a first-order digital low-pass filter, which realizes damping by lagging the phase and meanwhile reducing the magnitude response for a sufficient gain margin. Simulations verify the proposed method.

KW - digital low-pass filter

KW - single-loop damping

KW - GCF

KW - grid-connected inverters

KW - filter-based damping

U2 - 10.1109/IECON.2018.8591089

DO - 10.1109/IECON.2018.8591089

M3 - Article in proceeding

SN - 978-1-5090-6685-8

SP - 6122

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BT - Proceedings of IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society

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T2 - 44th Annual Conference of the IEEE Industrial Electronics Society

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ER -

Digital Low-Pass-Filter-Based Single-Loop Damping for LCL-Filtered Grid-Tied Inverters

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