一种新型四象限多电平变流器  

Four-quad multilevel converter

作　　者：高志刚[1] 冬雷[1] 廖晓钟[1] 庄亚平[2] 周德佳[2] 

机构地区：[1]北京理工大学自动化学院,北京100081 [2]海军装备研究院,北京100073

出　　处：《电力自动化设备》2013年第6期52-57,69,共7页Electric Power Automation Equipment

摘　　要：提出了一种新型四象限多电平变流器拓扑结构,由级联H桥型整流器、中频变压器和级联H桥型逆变器三部分构成。建立了变流器的能量传输模型,提出了相应的控制方法和调制策略;分析了输入侧变换器的输出电压模型,给出了相应的调制算法流程。阐述了各中频H桥的工作相位的作用,即达到了控制各电容电压平衡的目的,实现了变流器的四象限运行。实验结果验证了拓扑结构和控制方法的正确性。所提变流器拓扑结构省去了传统的工频变压器,降低了变换器体积和重量,可以应用于高压大容量场合。A four-quad multilevel converter topology is proposed,which is composed of H-bridge rectifier,middle-frequency transformer and cascaded H-bridge inverter.The power flow model of converter is established,and its control algorithm and modulation strategy are presented.The output voltage model of input-side converter is analyzed and the corresponding modulation strategy is proposed.The working phase of each middle-frequency H-bridge is described,which functions to keep the voltage balance for each capacitor and realize the four-quad operation of converter.The experimental result validates the correctness of the proposed topology and algorithm.Without the power frequency transformer,the proposed converter has small size and weight,and is applicable in high-voltage large-capacity condition.

关 键 词：变流器 中频变压器 H桥 载波相移 电压控制 

分 类 号：TM46[电气工程—电器]