High-frequency Resonance Analysis and Impedance Reshaping Control of MMC-HVDC System Based on Frequency Coupling Impedance Model

被引：0
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作者：
Juanjuan Wang [1 ]
Wei Chen [1 ]
Yuekun Liu [1 ]
Chuang Fu [2 ]
Yunming Ye [3 ]
Junjie Feng [2 ]
机构：
[1] the School of Electric Power, South China University of Technology, Guangzhou, China, and W Chen is also with Guangdong Power Grid Co, Ltd
[2] the Electric Power Research Institute, China Southern Power Grid
[3] Guangdong Power Grid Co,
来源：
Journal of Modern Power Systems and Clean Energy. | 2024年 / 12卷 / 02期
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摘要：
In recent years, high-frequency resonance(HFR) events occurred in several modular multilevel converter based high-voltage direct current(MMC-HVDC) projects. The time delay of an MMC-HVDC system is the critical factor that induces HFR. The frequency coupling affects the impedance characteristics of an MMC and further deteriorates system stability. Therefore, in this paper, a multi-input multi-output admittance model of an MMC-HVDC system is developed to analyze its frequency characteristics. The effects of current loop, power loop, phase-locked loop, and operating point on the MMC frequency coupling degree are analyzed in detail. Meanwhile, to further suppress HFR in the MMC-HVDC system, an enhanced impedance reshaping control strategy based on the equivalent singleinput single-output impedance model is proposed. Finally, the accuracy of the enhanced impedance model and the effectiveness of the impedance reshaping control are verified by electromagnetic transient simulations in PSCAD.
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页数：12
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