摘要
多电平变换器作为一种应用于高压大功率变换场合的新型变换器 ,其相应的电路拓扑结构和PWM控制方法是当前的一个研究热点 ,基于现有的研究成果 ,该文认为当电平数超过 3时 ,采用级联型电路拓扑结构和三角载波PWM法的组合 ,是一种较为可行的方案。在此基础上 ,首先讨论了三种已有的多电平变换器三角载波PWM控制方法 ,根据它们各自的优缺点 ,提出了一种新型的适用于级联型多电平变换器的PWM方法。文中介绍了它们的原理和特点 ,为了比较它们的控制效果 ,采用功能强大的Saber软件进行了仿真研究 ,仿真结果表明 ,所提出的方法 ,在输出电压谐波和电压利用率方面 ,兼具前三种方法的优点。最后 ,作者对今后的研究提出了建议。
Multilevel converters are a novel kind of converters used in high voltage and high power application field. And its corresponding topology and PWM method are two research hot points. According to state of the art,it is a reasonable selection that using a cascaded multilevel converter topology controlled by triangle carried based PWM, when voltage level is more than three. Based on this point of view, the paper discusses three existing kinds of triangle carrier based PWM strategies firstly. Their principle, advantages and disadvantages are compared each other. Then a new kind of PWM strategy is presented, which is suitable for cascade multilevel converters. In order to compare the control effects of them, some simulations have been done by Saber simulation software. The simulation results show the proposed PWM method has many advantages of the three kinds of PWM method mentioned above, especially in output voltage harmonic and voltage utility ratio aspects. In the last part of the paper, some suggestions on future research are given.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2001年第8期42-46,共5页
Proceedings of the CSEE
基金
国家自然科学基金资助项目 (5 99470 0 6 )&&
