Abstract
The paper systematically studies the impacts of two major factors: device switching actions and inverter switching frequency on the whole EMI spectrum. Several powerful experimental results of electromagnetic interference(EMI) in voltage source inverter(VSI) with SiC and Si devices are provided. As far as the influence of switching actions is concerned: faster switching speed will generate higher EMI noise levels in the high frequency range, and ringing in the device switching will also make the EMI noise near the ringing frequency range worse. In the meantime, increasing of the switching frequency of the inverter will result in a higher EMI noise peak for the whole EMI spectrum. In order to suppress the EMI noise of the converter to meet standards, Random PWM(RPWM) and EMI filters are adopted. With RPWM, the EMI current can drop a few more dB than that with SVPWM, which makes the filter work better. Also, as extra attenuation can be provided, it provides the benefit of reducing the weight and volume of the inductor of the filter. Therefore, the combination of an advanced modulation strategy and EMI filter is proposed for suppressing of EMI noise in an inverter.
Highlights
Electromagnetic interference(EMI) is a serious problem in many power applications especially for transportation applications like aerospace and vehicle systems
This paper will give a comprehensive review of the physical principle of EMI noise for motor drive systems and provide powerful experimental results
If the EMI reduction modulation strategy RPWM instead of SVPWM is based on use of an existing EMI filter, an extra attenuation will be added without increasing weight and volume of the filter, and the system EMI current will drop below the standard more as shown in Fig.26, as it makes up for the inadequate attenuation of the designed filter
Summary
Electromagnetic interference(EMI) is a serious problem in many power applications especially for transportation applications like aerospace and vehicle systems. As shown in Fig., when the switching frequency increases from fsl to fsh, the spectral envelope will shift right at low frequency range and shift upwards at high frequency range, so the EMI of the whole spectrum will get higher. In Fig., the whole spectral envelope shifts left and upwards when the duty cycle increases from Dl to Dh, resulting in a more serious EMI noise issue at both low frequency range and high frequency ranges. The switching actions with fast di/dt and dv/dt in the current/voltage source mainly contribute to the high frequency range.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
