NPC 3 PWM SINLGE-PHASE NPC 3-LEVEL PWM CONVERTER FOR HIGH-SPEED RAILWAY PROPULSION SYSTEM USING DISCONTINUOUS MODULATION AND METHOD OF CONTROLLING THE SAME

摘要

In the single-phase NPC three-level PWM converter for a high speed railway propulsion control device according to an embodiment of the present invention, an offset voltage generator for generating an offset voltage based on the converter input command voltage, the clamping voltage and the DC link capacitor voltage output from the current controller. ; A gate command voltage generator for generating a gate command voltage based on the converter input command voltage and the offset voltage; And a PWM generator for generating a PWM signal for controlling the single-phase NPC three-level PWM converter circuit based on the gate command voltage and the carrier wave, wherein the gate command voltage may be a discontinuous modulation waveform.