DC LOOP-CURRENT DETECTING AND RESTRAINING METHODS FOR PARALLEL INVERTER SYSTEM  

逆变器并联系统直流环流检测与抑制方法(英文)

作　　者：陈良亮[1] 肖岚[1] 严仰光[1] 

机构地区：[1]南京航空航天大学航空电源航空科技重点实验室

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2004年第1期1-6,共6页南京航空航天大学学报（英文版）

基　　金：国家自然科学基金 (5 0 3 3 70 3 0 )资助项目 ;航空科学基金 (0 1 F5 2 0 3 2 )资助项目~~

摘　　要：DC component is contained in inverter output voltage due to many reasons such as the zero-point deviation of operational amplifiers and the differences between power switching transistors′ characteristics. For the parallel inverter system without output isolation transformers, the difference of DC components of the output voltage can cause large DC loop-current among modular inverters. Aiming at this problem, this paper studies several DC loop-current detecting and restraining methods. By digital adjustment with high precision on the DC components of reference sine wave, the DC components of inverter′s output voltage can be adjusted to restrain DC loop-current. Experimental results prove that the DC loop-current detecting and restraining methods have a good performance.运算放大器的零点漂移、逆变桥功率开关管的特性不一致等原因会使逆变器输出交流电压中含有直流分量。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间产生较大的直流环流。针对这一问题 ,本文研究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。试验结果证明 ,本文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。

关 键 词：DC loop-current DETECT digital adjustment parallel inverter 

分 类 号：TM464[电气工程—电器]