摘要
为改善级联型多电平逆变器输出电压波形质量,对通过控制逆变单元开关角实现级联多电平逆变器谐波控制的方法进行了分析研究。针对解方程组法消除特定谐波中高次多变量方程组难于求解的问题,提出了一种波形合成消除特定谐波的方法。利用此方法可通过简单的三角公式递推计算获得实现特定谐波消除的开关角。依据理论计算结果进行的例证演示列出了开关角所有可能的取值情况,说明通过逆变器开关角的选择可同时实现输出电压中特定谐波的消除及基波幅值的调节。仿真与实验结果验证了该方法的可行性。
In this paper, the means of harmonics control by selecting switching angles are analyzed for improving quality of output voltage in cascaded multilevel inverter. There is considerable difficulty in solving the multi-variable high-order equation system when the method of solving equations is applied to eliminate specified harmonics, a novel method of eliminating specified harmonics based on waveform resultant theory is presented in this paper, so the switching angles can be easily obtained by simple trigonometry formula deduction. The exemplifications based on calculation values give all possible solutions of switching angles and show that the different choice of switching angles can also adjust the fundamental-frequency voltage while eliminating the specific harmonics of cascade multilevel inverter output voltage. Simulation and experiment results verify validity of research work.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第6期69-73,共5页
Proceedings of the CSEE
关键词
级联型多电平逆变器
波形合成法
谐波畸变率
谐波控制
开关角
cascaded multilevel inverter
waveform resultant theory
total harmonic distortion
harmonics control
switching angle
