A Virtual Capacitor Control Method for Depression DC Voltage Fluctuation in MMC-HVDC System

This paper uses the internal energy of MMC to analyze the energy relationship between AC and DC sides of MMC, and proposes a method that MMC is equivalent to a virtual capacitor. The DC voltage controller with virtual capacitor is then designed, namely virtual capacitance control strategy. And the p...

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Bibliographic Details
Published in2021 International Conference on Power System Technology (POWERCON) pp. 2194 - 2199
Main Authors Yu, Linlin, Wang, Yang, Zhang, Wuqi, Yan, Xintong, Si, Ruihua, Wen, Yunfeng
Format Conference Proceeding
LanguageEnglish
Published IEEE 08.12.2021
Subjects
Capacitance
Capacitors
current control
DC voltage fluctuation
Depression
Fluctuations
MMC-HVDC
Power systems
Simulation
virtual capacitor
Voltage fluctuations
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Summary:This paper uses the internal energy of MMC to analyze the energy relationship between AC and DC sides of MMC, and proposes a method that MMC is equivalent to a virtual capacitor. The DC voltage controller with virtual capacitor is then designed, namely virtual capacitance control strategy. And the principle of determining the virtual capacitance size is given. The simulation model of MMC-HVDC is established by PSCAD/EMTDC. The simulation results show that the proposed virtual capacitor control strategy can effectively suppress DC voltage fluctuation under power disturbance and improve the security of MMC-HVDC transmission system.
ISSN:2642-6226
DOI:10.1109/POWERCON53785.2021.9697754