摘要
分析了三相逆变器在正弦脉冲宽度调制(SPWM)、3次谐波注入与典型空间矢量调制(SVPWM)几种情况下直流母线输入电流的成分,对于平衡线性负载而言,指出了母线输入电流中的谐波频率仅处于开关频率、开关频率的倍频及其各自的边带,进而得出了直流侧支撑电容在一个开关周期中不同时间段的电压脉动表达式。依据电容电压脉动表达式,提出了一种适用于常用调制方式的支撑电容设计原则。仿真与实验结果表明根据该设计原则可以达到很小的输出电压波形畸变率,表明了文中分析和设计的正确性。
This paper analyzes the harmonic components of the input current in the three-phase voltage source inverter under sinusoidal pulse-width modulation （SPWM）, third-harmonic injection PWM, and typical space vector PWM （SVPWM）. The analysis results show that the DC-link current only contains the high-frequency harmonics at the switching frequency, its multiples and the sidebands for balanced and linear loads. The equations of the voltage ripple at different time intervals are derived for the DC-link capacitor during one switching period. Based on the equations of the DC-link voltage ripple, a design principle is presented for the DC-link capacitor. Simulation and experimental results show that the inverter can achieve low total harmonic distortion （THD） based on the proposed design principle. Therefore, the correcfness of the analysis and design is verified.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第3期254-259,269,共7页
Transactions of China Electrotechnical Society
基金
台达电力电子科教发展计划重点项目(DREK2013001)
中央高校基本科研业务费专项资金(2012QN195)资助项目
