摘要
针对现代舰艇直流电网的谐波问题,在分析负载并联的12脉波整流站基本工作原理和理想条件下特征谐波的基础上,采用调制理论和傅里叶分析方法对交流侧电压不对称、触发脉冲间隔不对称和变压器漏感引起的换相问题等非理想条件下,整流系统直流侧输出电流(电压)的谐波情况进行理论分析和仿真验证。计算和仿真结果表明:交流侧电压的不对称和触发脉冲间隔的不对称会导致12脉波整流系统直流侧输出电流(电压)的2,4次等低次非特征谐波显著增多,而考虑变压器漏感引起的换相时,则直流侧输出将含有6 n次谐波分量且其他各次非特征谐波含量和总的谐波畸变率增加很多。
For harmonic problems of modern warships DC grid, the operation principle and characteristic harmonics at the DC side under ideal conditions of the 12-pulse wave parallel full bridge rectifier are analyzed. On basis of that, the harmonic conditions are calculated and analyzed using modulation theory and Fourier analysis and simulated using Matlab / Simulink when the AC side voltage is asymmetry,the trigger pulse intervals are asymmetry and considering the commutation caused by the transformers＇ leakage inductance. The results indicate that the 2th and 4th harmonic components increase obviously when the AC side voltage is asymmetry and the trigger pulse intervals are asymmetry of the 12-pulse wave rectifier. Also,when considering the commutation,the output current consists of 6 nth harmonics and the whole harmonic distortion increases significantly.
出处
《舰船科学技术》
北大核心
2015年第2期101-106,共6页
Ship Science and Technology
关键词
非特征谐波
12脉波整流
开关函数
傅里叶分析
non-characteristic harmonics
12-pulse wave rectifier
switching function
fourier analysis
