Evaluation of DC-link Voltage Ripple in Seven-Phase PWM Voltage Source Inverters

被引:0
|
作者
Vujacic, Marija [1 ]
Dordevic, Obrad [2 ]
Grandi, Gabriele [1 ]
机构
[1] Univ Bologna, Alma Mater Studiorum, Dept Elect Elect & Informat Engn, I-40136 Bologna, Italy
[2] Liverpool John Moores Univ, Dept Elect & Elect Engn, Liverpool, Merseyside, England
关键词
voltage source inverters; seven-phase systems; dc-bus voltage ripple; dc-link capacitor;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The analysis of dc-link inverter current and voltage ripple is important for the optimization of the input components, mainly the dc-link capacitor. In this paper reference is made to two-level seven-phase PWM voltage source inverters with balanced load, typically multiphase ac motor. The peak-to-peak amplitude of the dc-link voltage switching ripple within the fundamental period is analytically determined as a function of operating conditions: modulation index, output currents amplitude and phase angle. The maximum of voltage switching ripple is also derived in order to help with choice of the dc-link capacitor. The two most popular inverter modulation techniques are considered: sinusoidal PWM and centered PWM (CPWM, equivalent to space vector modulation, SVM). A comparison between them is made in terms of the dc voltage switching ripple envelope. Numerical simulations are carried out by Matlab/Simulink in order to verify the analytical results.
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页数:6
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