摘要
开关点预置法是航空电源主要使用的调制方法,这种方法能有效地减少低次谐波含量,输出波形畸变率很低的正弦波。开关角的大小是根据要消除谐波的具体次数来决定的。但是,当阻性负载的大小变化时,这组选定的开关角就不是最优的开关角,低次谐波含量随着负载的大小也有了一定的变化。本文主要研究了其变化的规律,并通过仿真验证,得到了谐波含量的变化规律。通过面积等效的原理调整开关角的大小,使得低次谐波含量减少,通过仿真验证了其正确性。
Switching point preset is the main modulation method of aviation power. This method can effectively reduce the low harmonic con- tent , and the sine wave distortion rate is very low. The switching angles size is determined according to the number of harmonics to eliminate. However, when the resistive load changes, switching angles of the selected group are not optimal. Low harmonic content has some changes when the load is changing. This article studies the change in the law and verifies it by simulation, and it gets the variation law of the harmonic content. Adjusting the size of switching angles through area equivalent principle makes the low harmonic content decreased, and its accuracy is verified by simulation.
出处
《计测技术》
2012年第6期14-17,共4页
Metrology & Measurement Technology
关键词
开关点预置
低次谐波
谐波含量
阻性负载
switching point preset
low harmonic
harmonic content
resistance load
