A Sliding-Mode Observer for MMC-HVDC Systems: Fault-Tolerant Scheme With Reduced Number of Sensors
نویسندگان
چکیده
The modular multilevel converter (MMC) has been widely adopted in different applications, such as high-voltage direct current (HVDC), electric drives and static synchronous compensators. Despite the application, MMC realization requires a high number of power electronic components, sensors, communication cables. This paper proposes sliding-mode observer for capacitor voltages MMC, using measurements arm currents voltages. A linear corrector within hysteresis band is proposed to reduce chattering dynamics. Moreover, guidelines tuning gain are presented. SM capacitance value included parameter uncertainty observer. proposal reduces requirements voltage sensors optical links allows fault-tolerant operation. performance evaluated through simulation 100 MVA three-phase MMC-HVDC during initialization, steady-state, submodule failures. effect switching sampling frequencies on also evaluated. Finally, experimental results validate downscale 3 kVA single-phase prototype.
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ژورنال
عنوان ژورنال: IEEE Transactions on Power Delivery
سال: 2023
ISSN: ['1937-4208', '0885-8977']
DOI: https://doi.org/10.1109/tpwrd.2022.3200419