Commutation laws transfer strategy for the feedforward switching losses optimal PWM for three-phases voltage source inverter

From the position of switching losses minimisation, the widely used three-phase PWM voltage source control technique is studied. Two problems have been solved: selection of the minimum switching losses commutation law; and transfer between selected commutation laws. From the consideration of fulfilling the requirements for transfers from one optimal switching law to another, it is preferable to use the zero momentary output voltage vector as the initial point of the optimal state cycle. Experimental results of this transfer strategy are presented and are shown to be quite satisfactory