中国电机工程学报2017，Vol.37Issue(14)：4165-4174,10.DOI:10.13334/j.0258-8013.pcsee.160819
基于改进型零序环流抑制方法的T型三电平并联并网系统
An Improved Zero-Sequence Circulating Current Suppression Based Method in Parallel Three-Level T-Type Grid-Connected Inverters
摘要
Abstract
Module parallel three-level T-type inverters (3LT2Is) can increase power rating and efficiency of systems.However,the topology of transformerless inverters with common dc-link would cause the zero-sequence circulating current (ZSCC) problem.Previous papers have proven that the ZSCC can be suppressed by adjusting the time of the zero-sequence component.However,the performance would be deteriorated without considering the disturbance caused by differences in currents.An averaged model of ZSCC was analyzed in detailed.A small vector feed-forward control method with the PI controller was proposed to reject disturbance in zero-axis current systems.Moreover,a double sampling method was employed to expand the bandwidth of the zero-axis current system.Therefore,the ZSCC can be suppressed satisfactorily when output currents are different by applying the proposed scheme.The effectiveness of the proposed method is verified by the experimental results.关键词
T型三电平逆变器/小矢量前馈控制/零序环流/双采样法Key words
three-level T-type inverter (3LT2I)/small vectors feed-forward control/zero-sequence circulating current (ZSCC)/double sampling method分类
信息技术与安全科学引用本文复制引用
邢相洋,陈阿莲,张子成,潘羿威,杜春水,张承慧..基于改进型零序环流抑制方法的T型三电平并联并网系统[J].中国电机工程学报,2017,37(14):4165-4174,10.基金项目
国家自然科学基金项目(51377101) （51377101）
国家重大国际(地区)合作研究基金项目(61320106011) （地区）
国家重大仪器研制专项项目(61527809).Project Supported by National Natural Science Foundation of China(51377101) （61527809）
Major International (Regional) Joint Research Project of China (61320106011) （Regional）
Special Projects for the Development of Major National Instruments (61527809). （61527809）
