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Balancing Of Sub Module Capacitor Voltage Of Hybrid Modular Multilevel Converter (mmc) Under Dc Bus Voltage Variation Of Hvdc System

BALANCING OF SUB MODULE CAPACITOR VOLTAGE OF HYBRID MODULAR MULTILEVEL CONVERTER (MMC) UNDER DC BUS VOLTAGE VARIATION OF HVDC SYSTEM

  • Project Code :
  • TEREPE19_36
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BALANCING OF SUB MODULE CAPACITOR VOLTAGE OF HYBRID MODULAR MULTILEVEL CONVERTER (MMC) UNDER DC BUS VOLTAGE VARIATION OF HVDC SYSTEM

A hybrid modular multilevel converter (MMC) consists of both Half-Bridge Submodule(HBSM)s and Full-Bridge Submodule(FBSM)s in each arm. It has several advantages over other MMC topologies, such as low system loss, reduced cost of the system, but still maintains fault ride-through capability against a solid DC side fault. However, the hybrid MMC may have a difficulty of submodule (SM) voltage balancing under variation of its DC bus voltage. Since the voltage unbalance of SMs results in SM capacitor overvoltage and low reliability of the system, the voltage of SMs, which can be also represented as energy of SMs, should be balanced at all time. In this paper, to extend the narrow adjustable range of DC bus voltage due to the voltage/energy unbalance, new feedback and feedforward energy balancing controller with revised sorting algorithm is proposed. The feedback control ensures the zero steady state error, while the feedforward control provides fast dynamic response in the energy balancing control. By applying the proposed control scheme, the hybrid MMC can keep the voltage balance between HBSMs and FBSMs in wider range of DC bus voltage. The full-scale computer simulation results demonstrate the validity of the proposed control scheme.

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