An Improved Submodule Unified Pulse Modulation Scheme for a Hybrid Modular Multilevel Converter  

作　　者：Sizhao Lu Kai Li Xiaoting Deng Siqi Li Zhengming Zhao 

机构地区：[1]Electrical Power Engineering Department,Kunming University of Science of Technology,Kunming 650500,China [2]Electrical Engineering Department,Tsinghua University,Beijing 10084,China

出　　处：《CES Transactions on Electrical Machines and Systems》2017年第3期322-333,共12页中国电工技术学会电机与系统学报（英文）

基　　金：This work was supported in part by the National Natural Science Foundation of China under Grant 51707088,51607081;the 5th-level talent introduction program of Kunming University of Science and Technology.

摘　　要：This paper presents an improved submodule unified pulse width modulation(SUPWM)scheme for a hybrid modular multilevel converter(MMC)composed of half-bridge submodules(HBSMs)and full-bridge submodules(FBSMs).The proposed SUPWM scheme can achieve an output voltage of(2N+1)(where N is the number of submodules in each arm)levels,which is the same as that of the carrier-phase-shifted PWM(CPSPWM)scheme.Meanwhile,the proposed SUPWM scheme can alleviate the uneven loss distributions between the left leg and right leg in FBSMs of the hybrid MMC.Moreover,the capacitor voltages of the sub-modules can be well balanced without complicated closed-loop voltage balancing controllers.The validity of the proposed SUPWM scheme is verified by both the simulated and experimental results.

关 键 词：Hybrid MMC loss distribution pulse width modulation 

分 类 号：TN9[电子电信—信息与通信工程]