I. Introduction
Nowadays, electric-motor driven systems consume more than 40% of the worldwide energy [1]. As a result, Adjustable Speed Drives (ASDs) play an important role in energy generation for today’s industrial world [2] –[4]. As shown in Fig. 1, in the typical applications of a three-phase ASD, power cable is used as a feeding interface between the motor and drive. According to Fig. 1, iPE-Motor and are the Common-Mode (CM) currents flowing to the ground due to the motor and cable parasitic couplings, respectively; therefore, iEq comprises the equivalent CM current due to iPE-Motor and . Recently, due to the growing tendency to increase the switching frequency of the power converters, parasitic couplings of the cables can significantly affect the Electromagnetic Compatibility (EMC) performance in the drive systems [5] –[7]. In fact, power cables can significantly reduce the CM impedance seen from the motor side, making the system more susceptible to Electromagnetic Interference (EMI) emissions [8].
A typical ASD including its power cable.