Current-fed three-phase PWM converter with sinewave line current shaping and power factor correction scheme

This paper describes a new method to select the optimum pulse-width modulation (PWM) patterns and a procedure to design a low-pass filter in a large-capacity current-source-fed active PWM power converter which is used to suppress higher harmonics flowing into the utility-grid power source. A feasible test is carried out using a 500 kVA active PWM power converter designed for unique considerations mentioned above. It is verified that these new considerations are effective to minimize higher harmonic current components flowing into the utility-grid AC line. Furthermore, this experimental work provides highly efficient AC/DC power converter characteristics under a unity power factor and sinewave line current shaping schemes