Abstract
The presented method of computer modeling of static and dynamic power losses in semiconductor diodes and transistors will make it possible to determine with sufficient accuracy of the components of the power losses of the frequency converter. The purpose of the study is to develop a computer model of the block for calculating the power losses of the power switches of the frequency converter, which would allow us to adequately determine the static and dynamic power losses in the transistors and diodes of the semiconductor converter SIEMENS SINAMICS G110 with a power of 1.5 kW. To carry out the analysis of semiconductor circuits of a rectifier and an autonomous voltage inverter with pulse-width modulation, the article uses simulation methods in the Matlab / Simulink environment. Analytical expressions describing static and dynamic power losses in power semiconductor diodes and transistors are given. Using the method of polynomial approximation of the power characteristics of IGBT transistors, mathematical expressions are obtained that describe the dependences Vse (Ic), Vf (If), Eon (Ic), Eoff (Ic), Erec (Ic). On the basis of the obtained expressions in Matlab / Simulimk, a block for calculating static and dynamic power losses has been developed. A computer model of the SIEMENS SINAMICS G110 frequency converter has been developed in the Matlab / Simulink environment using blocks from the SimPowerSystem library. Using the developed block for calculating power losses, the dependences of power losses on the switching frequency and load current are obtained. The results were verified by comparing the simulation data with the manufacturer data. The presented method for modeling static and dynamic power losses is applied in engineering and scientific research in assessing power losses and efficiency of frequency converters and other types of semiconductor converters. The advantage of this method is that it makes it possible to take into account the characteristics of specific diodes and transistors.
Keywords
Frequency converter, uncontrolled rectifier, autonomous voltage inverter, pulse-width modulation, static losses, dynamic losses, approximation, characteristic, efficiency.
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