Stability margin definition for a converter-grid system based on diagonal dominance property in the sequence-frame

Research output: Contribution to conferencePaper

Abstract

The increased presence of power converters in power networks has set new power system stability chal-lenges. New methodologies have been proposed to analyse these systems and one of the most promisingis the impedance-based stability criterion. To date using this method the grid interfaced converter is repre-sented in terms of impedances and it is assumed that the converter impedances within the sequence-frameare decoupled. However, coupling between the components of the sequence-frame converter impedanceshave been observed, and different studies have shown how relevant this might become to the stability per-formance. Hence, a stability margin that takes such coupling into account is presented in this paper. Thisresults in a more conservative measure of the stability robustness of the system, compared to the gainand phase margin figures employed in the impedance-based stability criterion. The presented study hasbeen used to assess how the relative stability of a VSC system connected to a weak grid varies with itsoperating point, and experimental data have been used to support the analytical study.

Conference

Conference21st European Conference on Power Electronics and Applications (EPE2019)
CountryItaly
CityGenona
Period2/09/196/09/19

Fingerprint

Stability criteria
Power converters
System stability

Keywords

  • converter circuit
  • converter control
  • voltage source converter
  • power transmission
  • renewabe energy systems

Cite this

Amico, G., Egea Alvarez, A., Xu, L., & Brogan, P. (2019). Stability margin definition for a converter-grid system based on diagonal dominance property in the sequence-frame. Paper presented at 21st European Conference on Power Electronics and Applications (EPE2019), Genona, Italy.
Amico, Gabriele ; Egea Alvarez, Agusti ; Xu, Lie ; Brogan, Paul. / Stability margin definition for a converter-grid system based on diagonal dominance property in the sequence-frame. Paper presented at 21st European Conference on Power Electronics and Applications (EPE2019), Genona, Italy.10 p.
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abstract = "The increased presence of power converters in power networks has set new power system stability chal-lenges. New methodologies have been proposed to analyse these systems and one of the most promisingis the impedance-based stability criterion. To date using this method the grid interfaced converter is repre-sented in terms of impedances and it is assumed that the converter impedances within the sequence-frameare decoupled. However, coupling between the components of the sequence-frame converter impedanceshave been observed, and different studies have shown how relevant this might become to the stability per-formance. Hence, a stability margin that takes such coupling into account is presented in this paper. Thisresults in a more conservative measure of the stability robustness of the system, compared to the gainand phase margin figures employed in the impedance-based stability criterion. The presented study hasbeen used to assess how the relative stability of a VSC system connected to a weak grid varies with itsoperating point, and experimental data have been used to support the analytical study.",
keywords = "converter circuit, converter control, voltage source converter, power transmission, renewabe energy systems",
author = "Gabriele Amico and {Egea Alvarez}, Agusti and Lie Xu and Paul Brogan",
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note = "21st European Conference on Power Electronics and Applications (EPE2019) ; Conference date: 02-09-2019 Through 06-09-2019",

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Amico, G, Egea Alvarez, A, Xu, L & Brogan, P 2019, 'Stability margin definition for a converter-grid system based on diagonal dominance property in the sequence-frame' Paper presented at 21st European Conference on Power Electronics and Applications (EPE2019), Genona, Italy, 2/09/19 - 6/09/19, .

Stability margin definition for a converter-grid system based on diagonal dominance property in the sequence-frame. / Amico, Gabriele; Egea Alvarez, Agusti; Xu, Lie; Brogan, Paul.

2019. Paper presented at 21st European Conference on Power Electronics and Applications (EPE2019), Genona, Italy.

Research output: Contribution to conferencePaper

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AU - Amico, Gabriele

AU - Egea Alvarez, Agusti

AU - Xu, Lie

AU - Brogan, Paul

PY - 2019/9/2

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AB - The increased presence of power converters in power networks has set new power system stability chal-lenges. New methodologies have been proposed to analyse these systems and one of the most promisingis the impedance-based stability criterion. To date using this method the grid interfaced converter is repre-sented in terms of impedances and it is assumed that the converter impedances within the sequence-frameare decoupled. However, coupling between the components of the sequence-frame converter impedanceshave been observed, and different studies have shown how relevant this might become to the stability per-formance. Hence, a stability margin that takes such coupling into account is presented in this paper. Thisresults in a more conservative measure of the stability robustness of the system, compared to the gainand phase margin figures employed in the impedance-based stability criterion. The presented study hasbeen used to assess how the relative stability of a VSC system connected to a weak grid varies with itsoperating point, and experimental data have been used to support the analytical study.

KW - converter circuit

KW - converter control

KW - voltage source converter

KW - power transmission

KW - renewabe energy systems

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Amico G, Egea Alvarez A, Xu L, Brogan P. Stability margin definition for a converter-grid system based on diagonal dominance property in the sequence-frame. 2019. Paper presented at 21st European Conference on Power Electronics and Applications (EPE2019), Genona, Italy.