基于动态偏置分配PD-PWM的变桥臂换流器子单元电容均压策略  

A Dynamic Bias Distribution PD-PWM Strategy for Alternate Arm Modular Multilevel Converter

作　　者：朱晋[1] 韦统振[1] 霍群海[1] 杨晓丹[1] 韩立博[1] 

机构地区：[1]中国科学院电工研究所,北京100190

出　　处：《电工技术学报》2016年第15期170-177,共8页Transactions of China Electrotechnical Society

摘　　要：变桥臂多电平变流拓扑(A2MC)是一类采用全桥子单元级联结构和IGBT串联型导向开关结构相结合的新型多电平变流器拓扑。针对其全桥子单元级联结构电容电压均衡的问题,提出了一种新型简单有效的PD-PWM桥臂调制方法。与传统的调制策略相比,该调制方法更容易实现,具备更好的动态特性,并且大幅降低计算时间,该调制策略在各类全桥子单元级联结构中具备强可移植性。仿真和实验结果验证了这种新型调制策略的简单性和有效性。Alternate arm multilevel converter（ A2MC） is a new voltage source converter topology which is suitable for high voltage direct current transmission（ VSC-HVDC）. This paper presents an improved phase disposition pulse width modulation suited for full-bridge cells in this topology. Compared to conventional carrier phase-shifted PWM,this modulation method is more easily to be realized and increase the robustness of system,the computation burden is also reduced. This method can be transfer to any other full bridge cells cascaded structure. Simulation and experimental results demonstrate the simplicity and effectiveness of this new type of modulation strategy.

关 键 词：全桥子单元 变桥臂 多载波调制策略 动态载波偏置分配 

分 类 号：TM46[电气工程—电器]