| 模块化多电平换流器型直流输电内部环流机理分析 |
| |
| 引用本文： | 屠卿瑞,徐政,郑翔,管敏渊.模块化多电平换流器型直流输电内部环流机理分析[J].高电压技术,2010,36(2):547-552. |
| |
| 作者姓名： | 屠卿瑞 徐政 郑翔 管敏渊 |
| |
| 作者单位： | 浙江大学电气工程学院,杭州,310027 |
| |
| 摘 要： | 模块化多电平换流器型直流输电(MMC-HVDC)是新一代多电平电压源换流器直流输电拓扑,它利用多个子模块串联,并采用特定的触发方式使桥臂电压波形逼近正弦,但其三相间的内部环流使得流过桥臂的正弦电流产生畸变,增大了桥臂电流的峰值,从而提高了对开关器件电流容量的要求。为研究桥臂环流的计算方法,通过瞬时能量平衡关系,分析了MMC内部环流的产生机理,指出其为2倍基波频率,且为负序性质,并进一步推导了环流大小的解析表达式,为选择桥臂串联电抗器,抑制环流提供了依据。最后通过PSCAD/EMTDC搭建了21电平MMC-HVDC双端系统模型,并采用了子模块电压均衡控制方法,仿真结果验证了该模型的有效性和环流计算公式的准确性。
|
| 关 键 词： | 模块化多电平换流器 直流输电 环流 2倍频 负序 电压均衡 |
Mechanism Analysis on the Circulating Current in Modular Multilevel Converter Based HVDC |
| |
| TU Qing-rui,XU Zheng,ZHENG Xiang,GUAN Min-yuan.Mechanism Analysis on the Circulating Current in Modular Multilevel Converter Based HVDC[J].High Voltage Engineering,2010,36(2):547-552. |
| |
| Authors: | TU Qing-rui XU Zheng ZHENG Xiang GUAN Min-yuan |
| |
| Affiliation: | Department of Electrical Engineering;Zhejiang University;Hangzhou 310027;China |
| |
| Abstract: | Modular multilevel converter based HVDC(MMC-HVDC) is a new generation of VSC-HVDC topology proposed by Siemens.Several sub modules and specific modulation are applied in a sine waveform of arm voltage.Due to the discrepancy of three-phase arm voltage,circulating current appears among the three-phase unit.The circulating current distorts the sine arm current and increases its peak value,so the requirements of current rating increase.Based on the conservation of energy,we analyzed the mechanism of circulating... |
| |
| Keywords: | modular multilevel converter HVDC circulating current double-freqency negative sequence voltage balancing |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
