ABSTRACT
A real trajectory of the flux achieved by pulse width modulation (PWM) operation presents both radial and angular errors. Calculation of the time intervals associated with each active state is only the first part of the generation of a PWM algorithm. Switching power loss for the discontinuous PWM algorithm is normalized to the switching power loss for the continuous PWM algorithm and shown in respect with the load power angle. The mathematical representation of three-phase measures treats the analysis of the three-phase system as a whole, instead of considering equations for each phase individually. Many control methods for three-phase systems have been derived from the mathematical approach. The SVM theory initially developed for three-phase voltage-source inverters has been extended with new applications to other three-phase topologies. The number of switchings can be reduced with a special arrangement of the switching sequence so that only one switching on each inverter leg occurs during the transition from one state to the next.
