新型单电源混合不对称多电平变换器拓扑及控制方法  

Topology and Control of Single Power Source Hybrid Asymmetrical Multilevel Converter

作　　者：孙醒涛[1] 孙力[1] 吴凤江[1] 赵克[1] 

机构地区：[1]哈尔滨工业大学电气与自动化学院,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2009年第33期8-14,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477009)~~

摘　　要：单电源混合不对称多电平变换器在结构上较混合多电平变换器简单,体积与成本得到降低,但存在控制复杂的问题。针对单电源混合不对称多电平变换器主变换器中点电位平衡与从变换器电容电压稳定难以同时协调控制的问题,提出一种新型单电源拓扑结构。通过在主变换器中增加一个辅助桥臂来独立地对中点电位进行调整,可极大地简化单电源变换器控制的复杂性。采用PI控制维持从变换器电容电压整体的稳定,同时从变换器采用冗余状态选择方法对每个输出电压周期内的电容电压进行调整。通过仿真和实验对新型拓扑和控制策略进行验证。Single power-sourced hybrid asymmetrical converters have some merits such as simple structure, reduction in volume and cost compared with hybrid asymmetrical converter, but its control is too complex. A novel single power asymmetrical converter topology was proposed in the paper to solve the difficulty in control of the neutral-point voltage and sub-converter capacitor＇s voltage synchronously. The control of converter was much simplified through adding an assistant leg to control the neutral-point voltage independently. PI control was adopted to control the system stability of sub-converter capacitor＇s voltage and redundant states selection was used to control the sub-converter capacitor＇s voltage in every period of output voltage. Finally, detailed simulation and test results verify the proposed topology and control method.

关 键 词：单电源 混合不对称 多电平变换器 拓扑 

分 类 号：TM464[电气工程—电器]