东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2010, Vol. 31 ›› Issue (12): 1677-1680+1716.DOI: -

• 论著 • 上一篇    下一篇

并联PWM整流器系统的零序环流抑制方法

陈宏志;王旭;刘建昌;闫士杰;   

  1. 东北大学信息科学与工程学院;
  • 收稿日期:2013-06-20 修回日期:2013-06-20 出版日期:2010-12-15 发布日期:2013-06-20
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50974145)

Suppress methods of zero sequence circulating current for parallel PWM rectifiers

Chen, Hong-Zhi (1); Wang, Xu (1); Liu, Jian-Chang (1); Yan, Shi-Jie (1)   

  1. (1) School of Information Science and Engineering, Northeastern University, Shenyang 110004, China
  • Received:2013-06-20 Revised:2013-06-20 Online:2010-12-15 Published:2013-06-20
  • Contact: Chen, H.-Z.
  • About author:-
  • Supported by:
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摘要： 直接并联PWM整流器仅以自身的零序电流为反馈控制进行环流抑制,难免造成整流器之间的零序电压竞争问题,导致PWM信号的调制饱和.针对这一问题,对PWM整流器并联系统的环流进行了深入分析,提出了抑制零序环流的综合解决方案.此方案引入了以交流电源中性点为参考的直流母线中点电压变量,各整流器依据其零序电流对该电压的低频分量的影响,确定其对环流的调节方式.仿真结果验证了所提控制方案的有效性.

关键词: 电力电子, 整流器, 控制方法, 环流, 并联系统

Abstract: Zero sequence circulating current of direct parallel PWM rectifiers will cause the rectifier power loss even the damage to switching members. If only the zero sequence current of rectifiers themselves is applied to the suppression of circulating current for feedback control, it is hard to avoid the competition between the zero sequence voltage of those rectifiers, thus causing the over modulation of the PWM signals. To solve the problems, the circulating current of PWM rectifier system was discussed in depth, with an integrated solution proposed to the suppression of zero sequence circulating current. In the solution voltage variable at the neutral point DC bus was introduced as the regulate point for AC power supply, and the way to regulate the circulating current was determined according to how the zero sequence current of all rectifiers affected the low-frequency component of the voltage. Simulation results verified the effectiveness of the proposed solution to the control of zero sequence current.

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