其他摘要：With the improvement of the engineering capacity and the DC voltage level of FACTS based on modular multilevel converter (MMC), it is putting forward higher requirement for capacitor bal-ance control issue of MMC sub-modules (SMs). In order to reduce the computational complexity of voltage balancing sorting of SMs and switching dissipation of MMC, a new voltage balancing control improved algorithm based on Quick Sort method and divided conquer was presented in this paper: dividing into groups twice according to the switching control instruction as well as charging and discharging active status of bridge arms in each control cycle; then choosing the SMs which have large difference with rated voltage within the minimum range on the basis of specific switching number; avoiding the prophecy of collating all SMs repeatedly. A MMC model has been set up on the PSCAD. Finally, the effectiveness of the design control method was verified. The results show that this voltage balancing method can be realized effectively under low switching dissipation and low ranking calculation.
