Arm-Balancing Control and Experimental Validation of a Grid-Connected MMC With Pulsed DC Load

作者：Jankovic Marija; Costabeber Alessandro^*; Watson Alan; Clare Jon C

来源：IEEE Transactions on Industrial Electronics, 2017, 64(12): 9180-9190.

DOI：10.1109/TIE.2017.2711516

• Arm-balancing control
• grid-connected converter
• modular multilevel converter (MMC)
• pulsed power

This paper focuses on the operation of a grid-modular multilevel converter (MMC) supplying a pulsed dc load. The goal is to achieve minimum ac power fluctuation despite the high power fluctuation present on the dc side. The MMC has been selected for its inherent ability to decouple ac and dc current controllers. However, if no additional provisions are taken, the pulsed load causes imbalance of cell capacitor voltages between upper and lower arms in each phase. This paper presents the theoretical analysis of the imbalance problem and proposes a simple arm-balancing controller to enable the operation of the converter under pulsed dc load. The effectiveness of the controller has been successfully verified on a 7 kW MMC experimental prototype with a 3 kA pulsed dc load.

• 出版日期2017-12