I. Introduction
Frequency inverters commonly applied in contemporary adjustable speed drives (ASD) are a cause of accompanying undesirable high frequency (HF) side effects in the powered AC motor and supplying grid [1]–[6]. Increase of pulse width modulation (PWM) carrier frequency and decrease of converter transistors' switching time intensify significantly occurring HF problems in various ways. One of the foremost problems related to these phenomena is generation of high frequency stray currents flowing through drive components due to high levels of converter's output voltage steepness (dV/dt) and inevitable parasitic capacitances [7]–[9]. HF stray currents, flowing in conducting components of the ASD due to the existence of parasitic inter-capacitances, are not limited by standard regulations related to EMC of power electronic converters. Nevertheless the foremost consequences of the stray HF current flow are generation of HF voltage components appearing in conductive elements of the ASD system. These HF voltage components are the fundamental source of conducted EMI emission in power electronic converters and can be highly hazardous.