DOI Number : 10.5614/itbj.eng.sci.2010.42.1.4
Hits : 13

Analysis and Minimization of Output Current Ripple of Multiphase Carrier-Based PWM Inverters

Pekik Argo Dahono

School of Electrical Engineering and Informatics, Institute of Technology Bandung,

Jl. Ganesa No. 10, Bandung 40132, Indonesia

Tel. 62-22-2503315, Fax. 62-22-2508132


Abstract. Analysis and minimization of output current ripple of multiphase carrier-based PWM inverters are presented in this paper. Analytical expression of 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 rms values of output current ripple of 5-, 7-, and 9-phase PWM inverters under various reference signals are compared. Experimental results are included to show the validity of the analysis method.

Keywords: Multiphase; PWM Inverter; Ripple; AC drive.

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