Abstract
Common-mode voltage can be reduced effectively by optimized modulation methods without increasing additional costs. However, the existing methods cannot satisfy the requirements of the vehicular electric-drive application. This paper optimizes the tri-state voltage modulation method to reduce the common-mode voltage for vehicular electric drive system applications. Firstly, the discontinuous switching issue during sector transition is analyzed. Under the limit of two switching times in one period, multiple alignments combination is proposed to address that issue. Secondly, the zero-voltage time intervals in different modulation ranges are explored. This paper proposes an unsymmetric translation method to reconstruct the voltage vector, and then the minimum zero-voltage time interval is controlled to enough value for safe switching. Finally, the proposed methods have been validated through experiments on a vehicular electric drive system. The results show that the common-mode voltage can be reduced effectively in the whole range with the optimized tri-state voltage modulation method.
Highlights
Common-Mode Voltage Reduction inThe conventional space vector pulse width modulation (SVPWM) has been widely applied to the vehicular electric drive system, as it performs well in terms of voltage linearity, current harmonics, and system efficiency [1,2]
The excessively high common-mode voltage (CMV) will lead to poor electromagnetic compatibility (EMC) performance [4]
This paper proposes an unsymmetric translation method to reconstruct the voltage vector, and the minimum zero-voltage time interval is controlled to a safe lower limit
Summary
The conventional space vector pulse width modulation (SVPWM) has been widely applied to the vehicular electric drive system, as it performs well in terms of voltage linearity, current harmonics, and system efficiency [1,2]. RCMV methods have bipolar line-to-line voltage patterns, require simultaneous switching, and cause significant voltage harmonics, which is not suitable for practical application Among those RCMV methods, the TSPWM performs best in the whole modulation range, harmonic proportion, and system efficiency [14]. The standard TSPWM needs to switch three times in one period when the voltage vector transit from one sector to another, which is not suitable for vehicular electric drive applications. In the standard TSPWM, the minimum zero-voltage time interval between line-toline voltage pulse reversals is close to zero in the border between the high and low region of TSPWM, which causes overvoltage and can be dangerous in a vehicular electric drive application. TSPWM technology; Section 3 analyzes two issues of the standard TSPWM, and proposes the corresponding solutions for each issue respectively; Section 4 compares the experimental results with or without the proposed methods; Section 5 discusses the work of this paper and makes a further research plan
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
