采用正负半桥子模块级联拓扑的高压多电平波形发生器  

A High-Voltage Multilevel Waveform Generator With Cascaded Topology of Positive and Negative Half Bridge Submodules

作　　者：李戈琦 庞磊[1] 孙玮[2] 龙天骏 张立松 叶明天 张乔根[1,2] LI Geqi;PANG Lei;SUN Wei;LONG Tianjun;ZHANG Lisong;YE Mingtian;ZHANG Qiaogen(School of Electrical Engineering,Xi＇an Jiaotong University,Xi＇an 710049,Shaanxi Province,China;College of Mechanical and Electrical Engineering,Wuyi University,Wuyishan 354300,Fujian Province,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]武夷学院电机工程学院,福建省武夷山市354300

出　　处：《电网技术》2018年第11期3820-3826,共7页Power System Technology

基　　金：国家电网公司科技项目资助项目(SGJSDK00KJJS1800292)~~

摘　　要：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。With development of electronization of power system equipment, many insulating components expose to step voltage waveforms, such as high-voltage（HV） pulse width modulation（PWM） waveforms and multilevel step-waveform. HV multilevel waveform generators need to develop for studying properties of insulating materials under complex waveforms. Based on analysis of traditional half-bridge multi-modular converter（MMC） topology and characteristics of typical insulation defects, a half-bridge sub-module with positive and negative charging topology is proposed. The problem of output voltage offset, caused by asymmetry discharge, can be solved with this topology. In addition, output voltage stability is improved and the topology is simplified. It is easy to achieve higher voltage level extension through series superposition as well. Finally, a HV multilevel waveform generator is developed with output amplitude of 4600 V and adjustable frequency. Multilevel sine waveforms and PWM waveforms are generated to verify feasibility of the proposed topology.

关 键 词：MMC 波形发生器 电压偏置 拓扑 绝缘特性 

分 类 号：TM86[电气工程—高电压与绝缘技术]