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Influence of the PWM strategy on the IGBTs thermal behavior in AC drives

This article analyzes the effect of the modulation strategy on the thermal behavior of the power devices in AC drives. Excessive temperatures in the Silicon can be prevented by adequate selection of the switching frequency and modulation method. Continuous and discontinuous modulation methods will be considered. The impact of the modulation strategy and switching frequency on the total harmonic distortion (THD) of the currents will also be considered, as increased values of the THD will have adverse effects on the machine, as increased losses, with the subsequent temperature increase. The relationship between the semiconductor temperature (which is not normally measured), and the heat sink temperature (which can be easily measured) will also be analyzed for the different modes of operation. Accurate estimation of the semiconductor temperature will enable advanced, more reliable modes or operation of the power converter.