逆变器并联系统直流环流产生原因及其检测与抑制方法  

REASONS AND METHODS FOR DETECTING AND RESTRAINING DC CIRCULATING CURRENT IN PARALLEL INVERTER SYSTEM

作　　者：陈良亮[1] 肖岚[1] 龚春英[1] 严仰光[1] 

机构地区：[1]南京航空航天大学航空电源重点实验室,江苏南京210016

出　　处：《中国电机工程学报》2004年第9期56-61,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50337030);中国航空科学基金项目(01F52032)~~

摘　　要：对于无输出隔离变压器的逆变器并联系统,各模块输出电压直流分量不一致会在模块问产生较大的直流环流。该文分析了逆变器输出电压产生直流分量的原因,介绍了逆变器并联系统直流环流检测和抑制方法。通过对逆变器基准正弦波直流分量的高精度数字调节,相应调节逆变器输出电压直流分量以抑制直流环流。在由两台3kVA逆变器组成的并联系统上进行的试验结果证明,该文介绍的直流环流检测与抑制方法对逆变器并联系统直流环流有较好的抑制效果。For a parallel inverter system without output isolating transformers, discrepancy in DC biases contained in the output voltage of each module can cause large DC circulating current among inverters. The reasons producing DC bias in inverter output voltage are analyzed, and the methods for detecting and restraining DC circulating current in parallel inverter system are also well stecdied in this paper. By digital adjustment with high precision on the DC bias of reference sine wave, the DC bias contained in inverter output voltage can be adjusted to restrain DC circulating current. Experimental results in a parallel system consists of two 3kVA inverters prove that the DC circulating current detecting and restraining methods proposed in this paper have a good performance on restraining DC circulating current.

关 键 词：逆变器 并联系统 直流环流 检测 

分 类 号：TM464[电气工程—电器]