Frequency-Coupling Impedance Model Based Analysis of a High-Frequency Resonance Incident in an Actual MMC-HVDC System

Recently, a high-frequency resonance (HFR) incident has been captured in an actual HVDC project of China Southern Power Grid, which is regarded as a new stability issue caused by the interaction between the modular multilevel converter (MMC) and the weak ac grid. To investigate this event, this pape...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2020-12, Vol.35 (6), p.2963-2971
Main Authors: Man, Jiufang, Xie, Xiaorong, Xu, Shukai, Zou, Changyue, Yin, Congqi
Format: Article
Language:English
Subjects:
Converters
Coupling
Couplings
Frequency-coupling impedance model
Harmonic analysis
high-frequency resonance
HVDC transmission
Impedance
Impedance matrix
modular multilevel converter
Power system stability
Resonance
Stability analysis
Stability criteria
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Summary:Recently, a high-frequency resonance (HFR) incident has been captured in an actual HVDC project of China Southern Power Grid, which is regarded as a new stability issue caused by the interaction between the modular multilevel converter (MMC) and the weak ac grid. To investigate this event, this paper proposes a stability analysis method based on the frequency-coupling impedance model (FCIM). First, the FCIMs of the MMC and the ac grid are established in abc -frame individually with the frequency coupling effect of the MMC taken into account. Next, they are aggregated into a two-by-two impedance matrix by numerical calculation. Then, based on the aggregated FCIM, a criterion is developed to locate the HFR modes and to evaluate their stability. Finally, the results obtained from FCIM-based analysis are verified by electromagnetic transient (EMT) simulations as well as the field measurements.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2020.3022504