Imperial College London
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DrYunjieGu

Faculty of Engineering, Department of Electrical and Electronic Engineering

Lecturer in Power Systems
 
 
 
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Contact

 

yunjie.gu Website

 
 
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Location

 

1119Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Li:2021:10.1109/TPEL.2020.3015158,
author = {Li, Y and Yunjie, G and Yue, Z and Junyent-Ferre, A and Xin, X and Green, TC},
doi = {10.1109/TPEL.2020.3015158},
journal = {IEEE Transactions on Power Electronics},
pages = {3377--3395},
title = {Impedance circuit model of grid-forming inverter: visualizing control algorithms as circuit elements},
url = {http://dx.doi.org/10.1109/TPEL.2020.3015158},
volume = {36},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The impedance model is widely used for analyzing power converters. However, the output impedance is an external representation of a converter system, i.e., it compresses the entire dynamics into a single transfer function with internal details of the interaction between states hidden. As a result, there are no programmatic routines to link each control parameter to the system dynamic modes and to show the interactions among them, which makes the designers rely on their experience and heuristic to interpret the impedance model and its implications. To overcome these obstacles, this paper proposes a new modeling tool named as impedance circuit model, visualizing the closed-loop power converter as an impedance circuit with discrete circuit elements rather than an all-in-one impedance transfer function. It can reveal the virtual impedance essence of all control parameters at different impedance locations and/or within different frequency bandwidths, and show their interactions and coupling effects. A grid-forming voltage-source inverter (VSI) is investigated as an example, with considering its voltage controller, current controller, control delay, voltage/current dq-frame cross-decoupling terms, output-voltage/current feedforward control, droop controllers, and three typical virtual impedances. The proposed modeling tool is validated by frequency-domain spectrum measurement and time-domain step response in simulations and experiments.
AU  - Li,Y
AU  - Yunjie,G
AU  - Yue,Z
AU  - Junyent-Ferre,A
AU  - Xin,X
AU  - Green,TC
DO  - 10.1109/TPEL.2020.3015158
EP  - 3395
PY  - 2021///
SN  - 0885-8993
SP  - 3377
TI  - Impedance circuit model of grid-forming inverter: visualizing control algorithms as circuit elements
T2  - IEEE Transactions on Power Electronics
UR  - http://dx.doi.org/10.1109/TPEL.2020.3015158
UR  - https://ieeexplore.ieee.org/document/9162492
UR  - http://hdl.handle.net/10044/1/82204
VL  - 36
ER  -
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