A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid

Weihua Zhou; Yanbo Wang; Raymundo E. Torres-Olguin; Dong Liu; Zhe Chen

doi:10.1109/APEC39645.2020.9124173

A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid

Weihua Zhou^*, Yanbo Wang, Raymundo E. Torres-Olguin, Dong Liu, Zhe Chen

^*Corresponding author for this work

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

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Abstract

This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis. Steady-state terminal voltage and current information of the GCI part which are necessary in conventional dq impedance modelling methods are calculated based on grid parameters, i.e., grid voltage and grid impedance, and current references of current-controlled GCI or power references of power-controlled GCI. In addition, effects of dynamics of grid voltage and phase-locked loop (PLL) on dq impedance characteristics of grid part are also investigated, which enables the modified dq impedance model of grid part to relate with that of GCI part. The modified dq impedance model of the GCI part which takes the effects of grid voltage and grid impedance into account need not know steady-state terminal voltage and current information. In addition, the modified dq impedance model of grid part may provide accurate stability analysis during grid voltage changes. The insight of instability mechanism of the GCI-grid coupling system may be facilitated using the modified dq impedance models. Simulation results are given to validate correctness of the proposed dq impedance model of the GCI-grid system, and effectiveness of the dq impedance model for stability analysis.

Original language	English
Title of host publication	Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)
Number of pages	6
Publisher	IEEE Press
Publication date	Jun 2020
ISBN (Print)	978-1-7281-4830-4
ISBN (Electronic)	978-1-7281-4829-8
DOIs	https://doi.org/10.1109/APEC39645.2020.9124173
Publication status	Published - Jun 2020
Event	2020 IEEE Applied Power Electronics Conference and Exposition (APEC) - New Orleans, LA, United States Duration: 15 Mar 2020 → 19 Mar 2020

Conference

Conference	2020 IEEE Applied Power Electronics Conference and Exposition (APEC)
Country/Territory	United States
City	New Orleans, LA
Period	15/03/2020 → 19/03/2020

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

Keywords

Coupling effect
dq impedance model
Grid connected inverter
Grid dynamics
Stability analysis
Terminal voltage

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10.1109/APEC39645.2020.9124173

A Modified DQ Impedance Model of Three-PhaseAccepted author manuscript, 4.37 MB

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COPE: Voltage Control and Protection for a Grid towards 100 Power Electronics and Cable Network
Chen, Z. (PI), Fang, J. (CoI), Su, C. (Project Participant) & Miltersen, A. H. (Project Coordinator)
ForskEL, EUDP
01/10/2017 → 03/12/2020
Project: Research

Cite this

Zhou, Weihua ; Wang, Yanbo ; E. Torres-Olguin, Raymundo et al. / A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid. Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press, 2020. (I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings).

@inproceedings{521ae27c72644c68ad43cc3dfd58da0a,

title = "A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid",

abstract = "This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis. Steady-state terminal voltage and current information of the GCI part which are necessary in conventional dq impedance modelling methods are calculated based on grid parameters, i.e., grid voltage and grid impedance, and current references of current-controlled GCI or power references of power-controlled GCI. In addition, effects of dynamics of grid voltage and phase-locked loop (PLL) on dq impedance characteristics of grid part are also investigated, which enables the modified dq impedance model of grid part to relate with that of GCI part. The modified dq impedance model of the GCI part which takes the effects of grid voltage and grid impedance into account need not know steady-state terminal voltage and current information. In addition, the modified dq impedance model of grid part may provide accurate stability analysis during grid voltage changes. The insight of instability mechanism of the GCI-grid coupling system may be facilitated using the modified dq impedance models. Simulation results are given to validate correctness of the proposed dq impedance model of the GCI-grid system, and effectiveness of the dq impedance model for stability analysis. ",

keywords = "Coupling effect, dq impedance model, Grid connected inverter, Grid dynamics, Stability analysis, Terminal voltage",

author = "Weihua Zhou and Yanbo Wang and {E. Torres-Olguin}, Raymundo and Dong Liu and Zhe Chen",

year = "2020",

month = jun,

doi = "10.1109/APEC39645.2020.9124173",

language = "English",

isbn = "978-1-7281-4830-4",

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

publisher = "IEEE Press",

booktitle = "Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)",

note = "2020 IEEE Applied Power Electronics Conference and Exposition (APEC) ; Conference date: 15-03-2020 Through 19-03-2020",

}

Zhou, W, Wang, Y, E. Torres-Olguin, R, Liu, D & Chen, Z 2020, A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid. in Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press, I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings, 2020 IEEE Applied Power Electronics Conference and Exposition (APEC), New Orleans, LA, United States, 15/03/2020. https://doi.org/10.1109/APEC39645.2020.9124173

A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid. / Zhou, Weihua; Wang, Yanbo; E. Torres-Olguin, Raymundo et al.
Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press, 2020. (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 - A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid

AU - Zhou, Weihua

AU - Wang, Yanbo

AU - E. Torres-Olguin, Raymundo

AU - Liu, Dong

AU - Chen, Zhe

PY - 2020/6

Y1 - 2020/6

N2 - This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis. Steady-state terminal voltage and current information of the GCI part which are necessary in conventional dq impedance modelling methods are calculated based on grid parameters, i.e., grid voltage and grid impedance, and current references of current-controlled GCI or power references of power-controlled GCI. In addition, effects of dynamics of grid voltage and phase-locked loop (PLL) on dq impedance characteristics of grid part are also investigated, which enables the modified dq impedance model of grid part to relate with that of GCI part. The modified dq impedance model of the GCI part which takes the effects of grid voltage and grid impedance into account need not know steady-state terminal voltage and current information. In addition, the modified dq impedance model of grid part may provide accurate stability analysis during grid voltage changes. The insight of instability mechanism of the GCI-grid coupling system may be facilitated using the modified dq impedance models. Simulation results are given to validate correctness of the proposed dq impedance model of the GCI-grid system, and effectiveness of the dq impedance model for stability analysis.

AB - This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis. Steady-state terminal voltage and current information of the GCI part which are necessary in conventional dq impedance modelling methods are calculated based on grid parameters, i.e., grid voltage and grid impedance, and current references of current-controlled GCI or power references of power-controlled GCI. In addition, effects of dynamics of grid voltage and phase-locked loop (PLL) on dq impedance characteristics of grid part are also investigated, which enables the modified dq impedance model of grid part to relate with that of GCI part. The modified dq impedance model of the GCI part which takes the effects of grid voltage and grid impedance into account need not know steady-state terminal voltage and current information. In addition, the modified dq impedance model of grid part may provide accurate stability analysis during grid voltage changes. The insight of instability mechanism of the GCI-grid coupling system may be facilitated using the modified dq impedance models. Simulation results are given to validate correctness of the proposed dq impedance model of the GCI-grid system, and effectiveness of the dq impedance model for stability analysis.

KW - Coupling effect

KW - dq impedance model

KW - Grid connected inverter

KW - Grid dynamics

KW - Stability analysis

KW - Terminal voltage

U2 - 10.1109/APEC39645.2020.9124173

DO - 10.1109/APEC39645.2020.9124173

M3 - Article in proceeding

SN - 978-1-7281-4830-4

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

BT - Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

PB - IEEE Press

T2 - 2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

Y2 - 15 March 2020 through 19 March 2020

ER -

Zhou W, Wang Y, E. Torres-Olguin R, Liu D, Chen Z. A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid. In Proceedings of 2020 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE Press. 2020. (I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings). doi: 10.1109/APEC39645.2020.9124173

A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid

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COPE: Voltage Control and Protection for a Grid towards 100 Power Electronics and Cable Network

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