An Electric Propulsion System with Two-Channel Direct Frequency Conversion and a Built-in Switch
Abstract
Modern electrical propulsi on systems have at the irheart a frequency converter serving to perform smooth starting and control of the motor rotation frequency. Widely used converters with pulse-width modulati on featurea simple circuit design but have certain problems relating to electromagnetic compatibility with the power supply network and equipment, and it should be noted that there is a direct link between the frequency converter net cost and voltage quality. The problem of electric power quality can be solved by using various filters, but such solutions entail a growth of weight, dimensions, and cost of the entire electric drive system. The reisakind of direct frequency converter that contains two channels and produces a continuous sinusoidal output voltage.The use of this solution makes it possible to do with out expensive filters and to improve the technical characteristics of the system as a whole. However, the use of two-channel frequency conversion is generally associated with the need to use a larger number of switching devices (IGBT), which makes the system more costly and less reliable. A system design versionis proposed that make sitpossible to decrease the number of switch esbyafactor of 1.5 at the expense of using only two multiphase transformer or generator windings for frequency conversion.
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