HIGH-FREQUENCY IMPEDANCE MODEL OF MODULAR MULTILEVEL CONVERTER FOR HIGHFREQUENCY RESONANCE ANALYSIS
HIGH-FREQUENCY IMPEDANCE MODEL OF MODULAR MULTILEVEL CONVERTER FOR HIGHFREQUENCY RESONANCE ANALYSIS
- Author(s): Jiahao Yin 1 ; Jing Lyu 1 ; Haotian Yu 1 ; Binghui Wang 2 ; Xu Cai 1
- DOI: 10.1049/icp.2021.2271
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- Author(s): Jiahao Yin 1 ; Jing Lyu 1 ; Haotian Yu 1 ; Binghui Wang 2 ; Xu Cai 1
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View affiliations
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Affiliations:
1:
School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University , Shanghai , China ;
2: State Grid Jibei Electric Power Co. Ltd. Research Institute , Beijing , China
Source:
The 10th Renewable Power Generation Conference (RPG 2021),
2021
p.
29 – 34
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Affiliations:
1:
School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University , Shanghai , China ;
- Conference: The 10th Renewable Power Generation Conference (RPG 2021)
- DOI: 10.1049/icp.2021.2271
- ISBN: 978-1-83953-606-9
- Location: Online Conference
- Conference date: 14-15 October 2021
- Format: PDF
The high-voltage dc (HVDC) transmission is preferred for grid-integration of large-scale long-distance offshore wind farms and practical projects based on the modular multilevel converter (MMC) for wind farms have been globally put into operation or under construction. However, the high-frequency resonance (HFR) phenomena have frequently happened in the MMCHVDC projects in recent years, e.g., 1271 Hz HFR in LuXi Project, 700 Hz and 1.8 kHz HFR in YuE Project, etc. To reveal the generation mechanisms of the HFR phenomena, a simple but accurate model is necessary. Nevertheless, the existing models of MMC are either too complicated or overly simplified, which are not appropriate to the HFR analysis. In this paper, an accurate high-frequency impedance model of MMC is proposed for the HFR analysis. The island control and gridconnection control of MMC are considered in the modelling, respectively. The developed high-frequency impedance models are compared with the detailed impedance models of MMC with different control strategies, which shows that the highfrequency impedance models are able to accurately represent all the impedance characteristics in the high-frequency range above 200 Hz. Furthermore, the impact of different control strategies on the high-frequency impedance characteristics is discussed.
Inspec keywords: power grids; HVDC power transmission; HVDC power convertors; offshore installations; wind power plants
Subjects: Control of electric power systems; Power convertors and power supplies to apparatus; Wind power plants; d.c. transmission