Quasi-dual modulation of three-phase PWM converters

The possibility of transferring the modulation method developed for a pulse width modulated (PWM) power converter with a DC voltage link (VLC) to a PWM converter with a DC current link (CLC) based on the inverse current and voltage behavior of these two systems is evaluated. The duality between VLC and CLC, which has been intuitively clear, is treated here in a scientific approach. It is shown that the nonplanar property of three-phase bridge circuits leads to a quasi-dual relation of the switching states of the VLC and CLC systems. The code conversion of the binary switching functions of a VLC into control signals of the power electronic devices of a CLC is given. The remaining degree of freedom of the correspondence is set by the requirement of minimum switching frequency of the converter