Analysis and minimization of output current ripple of multiphase PWM inverters
a School of Electrical Engineering and Informatics, Institute of Technology Bandung, Indonesia
Abstract
Analysis and minimization of output current ripple of multiphase PWM inverters are presented in this paper. The analytical expression of the rms value of output current ripple of multiphase PWM inverters as a function of the reference signal is first derived. Based on this expression, it is shown that a pure sinusoidal signal is the optimum reference signal that results in minimum output current ripple. Different to three-phase PWM inverters, injection of harmonics into the sinusoidal reference signal is neither necessary nor useful. The output current ripples of multiphase PWM inverters become unsymmetrical when third harmonic signal is injected. The rms values of output current ripple of 5-, 7-, and 9-phase PWM inverters under various reference signals are compared.
Author keywords
Current ripple,Reference signal,Sinusoidal signal
Indexed keywords
Multiphase,PWM inverter,Ripple