DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter

Xin Zhang; Henry Shu-hung Chung; Yuan-Bin He; Chun-Tak Lai; Weimin Wu

doi:10.1109/ECCE.2017.8096608

DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter

Xin Zhang
, Henry Shu-hung Chung^*
, Yuan-Bin He
, Chun-Tak Lai
, Weimin Wu

^*Corresponding author for this work

Centre for Smart Energy Conversion and Utilization Research

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

2 Citations (Scopus)

Abstract

Full Feed-forward (FF) approach lias been proved to be an effective method to suppress the output current distortion of the LCL type grid-connected inverter (GO) due to grid voltage harmonics. Since most of the existing FF approachs are realized by digital control, a futher study of the digital control based (DC B) FF approach has been carried out in this paper firstly. It is shown that, there are two limitations of the DCB-FF approach: a) the DCB-FF approach does not play a role in suppressing current distortion at medium-high frequency range; b) the DCB-FF approach reduces the system phase margin at low frequency range and may cause the system instability problem at weak grid case. In order to solve the above problems, a digtal-analog hybrid based full feed-forward (DAH-FF) approach has been proposed in this paper. This DAH-FF approach not only can suppress the GO current distortion at the medium-high frequency range, but also can improve the system stability when the GO connects to weak grid. The concept, design principle and implementation method of the DAH-FF approach have been discussed carefully in this paper. Finally, the proposed DAH-FF approach has been validated by both simulation and experimental results.

Original language	English
Title of host publication	2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Publisher	IEEE
Pages	3390-3397
ISBN (Electronic)	9781509029983
ISBN (Print)	9781509029976, 9781509029990
DOIs	https://doi.org/10.1109/ECCE.2017.8096608
Publication status	Published - Oct 2017
Event	9th IEEE Energy Conversion Congress and Exposition (ECCE 2017) - Cincinnati, United States Duration: 1 Oct 2017 → 5 Oct 2017

Conference

Conference	9th IEEE Energy Conversion Congress and Exposition (ECCE 2017)
Place	United States
City	Cincinnati
Period	1/10/17 → 5/10/17

Research Keywords

Digital-analog
Feedforward approach
Grid-connected inverter
Stability
Total harmonic distortions
Weak grid

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@inproceedings{e02cc3c8d9984b7f8548764966f8443f,

title = "DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter",

abstract = "Full Feed-forward (FF) approach lias been proved to be an effective method to suppress the output current distortion of the LCL type grid-connected inverter (GO) due to grid voltage harmonics. Since most of the existing FF approachs are realized by digital control, a futher study of the digital control based (DC B) FF approach has been carried out in this paper firstly. It is shown that, there are two limitations of the DCB-FF approach: a) the DCB-FF approach does not play a role in suppressing current distortion at medium-high frequency range; b) the DCB-FF approach reduces the system phase margin at low frequency range and may cause the system instability problem at weak grid case. In order to solve the above problems, a digtal-analog hybrid based full feed-forward (DAH-FF) approach has been proposed in this paper. This DAH-FF approach not only can suppress the GO current distortion at the medium-high frequency range, but also can improve the system stability when the GO connects to weak grid. The concept, design principle and implementation method of the DAH-FF approach have been discussed carefully in this paper. Finally, the proposed DAH-FF approach has been validated by both simulation and experimental results.",

keywords = "Digital-analog, Feedforward approach, Grid-connected inverter, Stability, Total harmonic distortions, Weak grid",

author = "Xin Zhang and Chung, \{Henry Shu-hung\} and Yuan-Bin He and Chun-Tak Lai and Weimin Wu",

year = "2017",

month = oct,

doi = "10.1109/ECCE.2017.8096608",

language = "English",

isbn = "9781509029976",

pages = "3390--3397",

booktitle = "2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017",

publisher = "IEEE",

address = "United States",

note = "9th IEEE Energy Conversion Congress and Exposition (ECCE 2017) ; Conference date: 01-10-2017 Through 05-10-2017",

}

Zhang, X, Chung, HS, He, Y-B, Lai, C-T & Wu, W 2017, DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter. in 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017., 8096608, IEEE, pp. 3390-3397, 9th IEEE Energy Conversion Congress and Exposition (ECCE 2017), Cincinnati, Ohio, United States, 1/10/17. https://doi.org/10.1109/ECCE.2017.8096608

DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter. / Zhang, Xin; Chung, Henry Shu-hung; He, Yuan-Bin et al.
2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. IEEE, 2017. p. 3390-3397 8096608.

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter

AU - Zhang, Xin

AU - Chung, Henry Shu-hung

AU - He, Yuan-Bin

AU - Lai, Chun-Tak

AU - Wu, Weimin

PY - 2017/10

Y1 - 2017/10

N2 - Full Feed-forward (FF) approach lias been proved to be an effective method to suppress the output current distortion of the LCL type grid-connected inverter (GO) due to grid voltage harmonics. Since most of the existing FF approachs are realized by digital control, a futher study of the digital control based (DC B) FF approach has been carried out in this paper firstly. It is shown that, there are two limitations of the DCB-FF approach: a) the DCB-FF approach does not play a role in suppressing current distortion at medium-high frequency range; b) the DCB-FF approach reduces the system phase margin at low frequency range and may cause the system instability problem at weak grid case. In order to solve the above problems, a digtal-analog hybrid based full feed-forward (DAH-FF) approach has been proposed in this paper. This DAH-FF approach not only can suppress the GO current distortion at the medium-high frequency range, but also can improve the system stability when the GO connects to weak grid. The concept, design principle and implementation method of the DAH-FF approach have been discussed carefully in this paper. Finally, the proposed DAH-FF approach has been validated by both simulation and experimental results.

AB - Full Feed-forward (FF) approach lias been proved to be an effective method to suppress the output current distortion of the LCL type grid-connected inverter (GO) due to grid voltage harmonics. Since most of the existing FF approachs are realized by digital control, a futher study of the digital control based (DC B) FF approach has been carried out in this paper firstly. It is shown that, there are two limitations of the DCB-FF approach: a) the DCB-FF approach does not play a role in suppressing current distortion at medium-high frequency range; b) the DCB-FF approach reduces the system phase margin at low frequency range and may cause the system instability problem at weak grid case. In order to solve the above problems, a digtal-analog hybrid based full feed-forward (DAH-FF) approach has been proposed in this paper. This DAH-FF approach not only can suppress the GO current distortion at the medium-high frequency range, but also can improve the system stability when the GO connects to weak grid. The concept, design principle and implementation method of the DAH-FF approach have been discussed carefully in this paper. Finally, the proposed DAH-FF approach has been validated by both simulation and experimental results.

KW - Digital-analog

KW - Feedforward approach

KW - Grid-connected inverter

KW - Stability

KW - Total harmonic distortions

KW - Weak grid

UR - https://www.scopus.com/pages/publications/85041441734

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85041441734&origin=recordpage

U2 - 10.1109/ECCE.2017.8096608

DO - 10.1109/ECCE.2017.8096608

M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 9781509029976

SN - 9781509029990

SP - 3390

EP - 3397

BT - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017

PB - IEEE

T2 - 9th IEEE Energy Conversion Congress and Exposition (ECCE 2017)

Y2 - 1 October 2017 through 5 October 2017

ER -

DAH-FF Approach to Improve the Current Quality and Stability of the LCL Type Grid-Connected Inverter

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