李戈琦;庞磊;孙玮;龙天骏;张立松;叶明天;张乔根;

• 1:西安交通大学电气工程学院
• 2:武夷学院电机工程学院

摘要(Abstract)：

随着电力系统设备电力电子化程度的不断提高,系统中诸多绝缘部件会承受多样化的高压脉宽调制(pulsewidth modulation,PWM)波形或高压多电平阶梯波形等阶跃性电压波形。为研究复杂多样的电压波形下设备或相关材料的绝缘特性,需要研制高压多电平波形发生器。在分析传统的半桥型模块化多电平变换器(multi-modularconverter,MMC)拓扑工作原理的基础上,结合典型绝缘缺陷等效负载特性的探讨,提出了一种正、负半桥子模块交替级联拓扑,抑制了因绝缘试验中不对称放电引起的输出电压偏置问题,提高了电源输出电压的稳定性,并且所需开关器件更少而利于小型化,同时便于串联叠加向高电压等级扩展。最终,通过对该发生器主要器件参数进行计算分析,研制了一台输出幅值为4600 V且频率可调的高压多电平波形发生器样机,可产生高压类正弦多电平电压波形、PWM电压波形等各类试验波形,验证了所提拓扑的可行性。

关键词(KeyWords)： MMC;波形发生器;电压偏置;拓扑;绝缘特性

Abstract:

Keywords:

基金项目(Foundation): 国家电网公司科技项目资助项目(SGJSDK00KJJS1800292)~~

作者(Author): 李戈琦;庞磊;孙玮;龙天骏;张立松;叶明天;张乔根;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.0805

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