Frequency coupling characteristics of electromagnetic oscillation in grid-connected converters

Yuzhi Wang; Liang Wang; Qirong Jiang

doi:10.1049/iet-gtd.2019.0633

Frequency coupling characteristics of electromagnetic oscillation in grid-connected converters

Yuzhi Wang, Liang Wang^*, Qirong Jiang

^*Corresponding author for this work

School of Automation

Tsinghua University

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Under certain conditions, grid-connected voltage source converter (VSC) may result in electromagnetic oscillations. Many coupling components with different frequencies could be observed in converter outputs when oscillation happens. The characteristics and mechanism of frequency coupling phenomenon in oscillations of VSC are studied. The magnitude relationship between first-order components in the three-phase domain is drawn by impedance model. The two first-order components will result in higher-order components due to the non-linearity of VSC controller. There are mainly three coupling paths in a controller: phase-locked loop, DC voltage fluctuation and overmodulation. The coupling mechanism and frequency distribution characteristics are investigated in this study. Theoretical results are validated by simulations with PSCAD/EMTDC.

Original language	English
Pages (from-to)	4339-4346
Number of pages	8
Journal	IET Generation, Transmission and Distribution
Volume	13
Issue number	19
DOIs	https://doi.org/10.1049/iet-gtd.2019.0633
Publication status	Published - 8 Oct 2019

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title = "Frequency coupling characteristics of electromagnetic oscillation in grid-connected converters",

abstract = "Under certain conditions, grid-connected voltage source converter (VSC) may result in electromagnetic oscillations. Many coupling components with different frequencies could be observed in converter outputs when oscillation happens. The characteristics and mechanism of frequency coupling phenomenon in oscillations of VSC are studied. The magnitude relationship between first-order components in the three-phase domain is drawn by impedance model. The two first-order components will result in higher-order components due to the non-linearity of VSC controller. There are mainly three coupling paths in a controller: phase-locked loop, DC voltage fluctuation and overmodulation. The coupling mechanism and frequency distribution characteristics are investigated in this study. Theoretical results are validated by simulations with PSCAD/EMTDC.",

author = "Yuzhi Wang and Liang Wang and Qirong Jiang",

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AU - Wang, Liang

AU - Jiang, Qirong

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Y1 - 2019/10/8

N2 - Under certain conditions, grid-connected voltage source converter (VSC) may result in electromagnetic oscillations. Many coupling components with different frequencies could be observed in converter outputs when oscillation happens. The characteristics and mechanism of frequency coupling phenomenon in oscillations of VSC are studied. The magnitude relationship between first-order components in the three-phase domain is drawn by impedance model. The two first-order components will result in higher-order components due to the non-linearity of VSC controller. There are mainly three coupling paths in a controller: phase-locked loop, DC voltage fluctuation and overmodulation. The coupling mechanism and frequency distribution characteristics are investigated in this study. Theoretical results are validated by simulations with PSCAD/EMTDC.

AB - Under certain conditions, grid-connected voltage source converter (VSC) may result in electromagnetic oscillations. Many coupling components with different frequencies could be observed in converter outputs when oscillation happens. The characteristics and mechanism of frequency coupling phenomenon in oscillations of VSC are studied. The magnitude relationship between first-order components in the three-phase domain is drawn by impedance model. The two first-order components will result in higher-order components due to the non-linearity of VSC controller. There are mainly three coupling paths in a controller: phase-locked loop, DC voltage fluctuation and overmodulation. The coupling mechanism and frequency distribution characteristics are investigated in this study. Theoretical results are validated by simulations with PSCAD/EMTDC.

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Frequency coupling characteristics of electromagnetic oscillation in grid-connected converters

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