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Energies 2017, 10(1), 1; doi:10.3390/en10010001

The Effect of Distributed Parameters on Conducted EMI from DC-Fed Motor Drive Systems in Electric Vehicles

1,2,* , 1,2
,
3
and
1,2
1
National Engineering Laboratory for Electric Vehicle, Beijing Institute of Technology, Beijing 100081, China
2
Co-Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology, Beijing 100081, China
3
Beijing Institute of Radio Metrology and Measurement, Beijing 100854, China
*
Author to whom correspondence should be addressed.
Academic Editor: Joeri Van Mierlo
Received: 18 August 2016 / Revised: 9 December 2016 / Accepted: 12 December 2016 / Published: 22 December 2016
(This article belongs to the Special Issue Advances in Electric Vehicles and Plug-in Hybrid Vehicles 2017)
View Full-Text   |   Download PDF [6480 KB, uploaded 22 December 2016]   |  

Abstract

The large dv/dt and di/dt outputs of power devices in DC-fed motor drive systems in electric vehicles (EVs) always introduce conducted electromagnetic interference (EMI) emissions and may lead to motor drive system energy transmission losses. The effect of distributed parameters on conducted EMI from the DC-fed high voltage motor drive systems in EVs is studied. A complete test for conducted EMI from the direct current fed(DC-fed) alternating current (AC) motor drive system in an electric vehicle (EV) under load conditions is set up to measure the conducted EMI of high voltage DC cables and the EMI noise peaks due to resonances in a frequency range of 150 kHz–108 MHz. The distributed parameters of the motor can induce bearing currents under low frequency sine wave operation. However the impedance of the distributed parameters of the motor is very high at resonance frequencies of 500 kHz and 30 MHz, and the effect of the bearing current can be ignored, so the research mainly focuses on the distributed parameters in inverters and cables at 500 kHz and 30 MHz, not the effect of distributed parameters of the motor on resonances. The corresponding equivalent circuits for differential mode (DM) and common mode (CM) EMI at resonance frequencies of 500 kHz and 30 MHz are established to determine the EMI propagation paths and analyze the effect of distributed parameters on conducted EMI. The dominant distributed parameters of elements responsible for the appearing resonances at 500 kHz and 30 MHz are determined. The effect of the dominant distributed parameters on conducted EMI are presented and verified by simulation and experiment. The conduced voltage at frequencies from 150 kHz to 108 MHz can be mitigated to below the limit level-3 of CISPR25 by changing the dominant distributed parameters. View Full-Text
Keywords: electric vehicle; DC-fed; motor drive system; conducted electromagnetic interference (EMI); distributed parameter electric vehicle; DC-fed; motor drive system; conducted electromagnetic interference (EMI); distributed parameter
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Zhai, L.; Lin, L.; Zhang, X.; Song, C. The Effect of Distributed Parameters on Conducted EMI from DC-Fed Motor Drive Systems in Electric Vehicles. Energies 2017, 10, 1.

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