摘要
模块化多电平换流器是一种新型的高压直流输电拓扑结构,它有着两电平电压源型拓扑结构不可比拟的优点,引起了国内外学术界和工业界的高度重视。模块化多电平换流器正确的数学模型能够很好的反映系统运行时的特性,为系统故障保护、优化控制以及参数的设计将提供强大的理论保障。深入研究了模块化多电平换流器的基本原理,建立了相应数学模型,推导出了电容电压,上下桥臂电流,相间环流的时域解析表达式。
Modular multilevel converter is a novel topological structure of high voltage direct current,which draws significant attention of academia and industries at home and abroad with its merits that two level voltage source converter can’t assimilate.Proper mathematic modeling can reflect the nature of the system and provide heavily theoretical security for system fault protection,optimization control and system parameters designing.After researching the principle of modular multilevel converter,this paper establishes its corresponding mathematic model and derives the analytic expressions of capacitance voltage,upper and lower arm current,phase to phase circulating current.
出处
《华东交通大学学报》
2013年第2期37-41,共5页
Journal of East China Jiaotong University
基金
江西省研究生创新专项基金(YC2012-S076)
关键词
模块化多电平换流器
高压直流输电
二倍频负序
桥臂电流
环流
modular multilevel converter
high voltage direct current
double frequency negative sequence
arm current
circulating current
