An Improved Modulation Method for Suppressing High Frequency Common-Mode Voltage in SiC Motor Drive System

High-frequency common-mode voltage generated by inverters causes severe negative effects, particularly in silicon carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs)-driven motors. Additionally, common suppression strategies would increase hardware expenses or sacrifice the sw...

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Bibliographic Details
Published in:World electric vehicle journal 2021-09, Vol.12 (3), p.111
Main Authors: Li, Hui, Zhang, Aibo, Xiang, Xuewei
Format: Article
Language:English
Subjects:
Algorithms
common-mode voltage
Compensation
Control algorithms
electric drive
Electric potential
Failure analysis
Field effect transistors
Hardware
Load
Metal oxide semiconductors
modulation
MOSFETs
permanent magnet motor
Pulse duration modulation
Semiconductor devices
Silicon carbide
silicon carbide inverter
Switching
Voltage
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Summary:High-frequency common-mode voltage generated by inverters causes severe negative effects, particularly in silicon carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs)-driven motors. Additionally, common suppression strategies would increase hardware expenses or sacrifice the switching speed of SiC devices. This article proposes an improved no-zero vector modulation strategy to suppress high-frequency common-mode voltage without increasing the cost of hardware. In this method, only nonzero vectors are utilized to reduce common-mode voltage. Firstly, the influence of different switching states on the characteristics of SiC MOSFETs has been studied by double-pulse tests, which explains why zero vectors will cause more serious voltage oscillations. Secondly, common-mode voltage suppression failure caused by the high-frequency dead zone effect has been analyzed in detail. Based on traditional Active Zero State Pulse Width Modulation (AZSPWM), complementary device conduction logic and dead-zone compensation methods are proposed. In switching moments, different turn-on logic is selected to ensure that only one switch acts, and different dead zone compensation methods are selected to deal with the common-mode suppression failure, which effectively avoids high-frequency common-mode voltage spikes. Finally, simulation and experimental results verify that the improved modulation algorithm can effectively suppress high-frequency common-mode voltage.
ISSN:2032-6653
2032-6653
DOI:10.3390/wevj12030111