Computer Simulation of the Inrush Current of Frequency Converter during Initial Start-Up

The paper presents a theoretical study using computer simulation of the influence of DC voltage link parameters of a frequency converter on the value of current consumed by the converter from the grid (input current). Frequency converters of different rated powers are considered. The presence of inductance in DC voltage link should be recognized as very useful and desirable for lower-power and medium-power frequency converters, since it has a strong limiting effect on the peak and amplitude values of the input current consumed by converter, and also has a beneficial effect on the harmonic composition of the input current, improving the convertor’s electromagnetic compatibility.