Voltage Stability and Transient Symmetrical Fault Current Control of Voltage-Controlled MMCs

Yingbiao Li, Jianbo Guo, Heng Wu, Xiongfei Wang*, Bing Zhao, Shanshan Wang, Guanglu Wu

*Kontaktforfatter

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Abstrakt

This paper presents a design-oriented analysis on the voltage stability and the transient fault current limitation of voltage-controlled modular multilevel converter (MMC) with L-filters. First, a dual-loop voltage control based on the L-filter plant is systematically designed, where the upper limits of controller parameters to ensure the small-signal stability are identified. Then, considering the transient current limitation during faults, the lower boundaries of inner current controller parameters are derived. Within the region of allowed controller parameters, the optimization is further made to minimize the closed-loop output impedance of MMC, which enhances the output voltage stiffness against the load current disturbance. Lastly, time-domain simulations corroborate the theoretical analysis.
OriginalsprogEngelsk
Artikelnummer8974229
TidsskriftIEEE Transactions on Power Delivery
Vol/bind35
Udgave nummer5
Sider (fra-til)2506-2516
Antal sider11
ISSN0885-8977
DOI
StatusUdgivet - okt. 2020

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