Abstract
The impact of electromagnetic interference (EMI) is an increasingly important aspect of the performance of switching inverters. The challenges of managing EMI continue to grow with the emergence of wide bandgap (WBG) devices, the trend towards ever-greater integration and higher power rating. This paper reviews suppression methods for the conductive common-mode (CM) EMI in inverter fed motor drives. In order to span EMI suppression across the full system design process, the review considers both mitigation from the sources and suppression along the conduction paths. Furthermore, the shortcomings and merits of the reviewed publications are discussed, and their attenuation frequency range and attenuation level are compared. It is demonstrated that the CM EMI at low frequency is mainly determined by the PWM strategies and can be reduced or even theoretically eliminated through zero common-mode control. On the other hand, the CM EMI at high frequency is markedly influenced by the switching transients of the power devices. Thus, various drive circuits are reviewed which improve the switching behavior. Finally, the deployment of passive and active filters to suppress or compensate for the EMI is discussed.
Highlights
Electric drives have been increasingly adopted in many industrial sectors due to their ability to yield highly controllable, fast response and high-power density systems solutions
As the switching frequency and switching speed of power devices and the inverter power continue to increase, the problems posed by Electromagnetic Interference (EMI) in electric drives are exacerbated
EMI in electric drives can be classified as conductive EMI and radiated EMI
Summary
Electric drives have been increasingly adopted in many industrial sectors due to their ability to yield highly controllable, fast response and high-power density systems solutions. As the switching frequency and switching speed of power devices and the inverter power continue to increase, the problems posed by Electromagnetic Interference (EMI) in electric drives are exacerbated. EMI has the potential to cause deterioration in the performance of electrical machines and its drive system through a variety of failure mechanisms, including, inter-alia, bearings damage, unexpected actions of power devices, interference on analogue feedback signals, etc. These problems eventually lead to system performance degradation or even shutdown. EMI in electric drives can be classified as conductive EMI and radiated EMI. The conductive EMI is defined with the frequency range from 150 kHz to 30 MHz in standard DO
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