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WANG Xubin,WANG Xuemei,ZHANG Bo.Improvement of Junction Temperature of Power Devices by Applying None Zero Vector SVM to Constant Power Area[J].JOURNAL OF POWER SUPPLY,2018,16(5):67-75
Improvement of Junction Temperature of Power Devices by Applying None Zero Vector SVM to Constant Power Area
Received:February 18, 2017  Revised:April 12, 2018
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DOI:10.13234/j.issn.2095-2805.2018.5.67
Keywords:power device  reliability  space vector modulation (SVM)  zero vector  power loss  junction temperature
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AuthorInstitutionEmail
WANG Xubin School of Electric Power, South China University of Technology, Guangzhou , China
WANG Xuemei School of Electric Power, South China University of Technology, Guangzhou , China epxmwang@scut.edu.cn
ZHANG Bo School of Electric Power, South China University of Technology, Guangzhou , China
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Abstract:
      The power losses of power devices in the inverter for electric vehicle(EV) not only waste the limited and valuable energy in EV, but also lead to an over-high junction temperature of power devices, which severely affects their reliability. Space vector modulation(SVM) can keep a relatively lower harmonic distortion of voltage in the range of line-ar modulation; however, a higher switching frequency will bring in larger switching losses. Over-modulation may lead to higher harmonic distortion to a certain degree, but it increases the inverter output voltage while reducing the switching times of power devices. To take both the harmonic distortion of inverter voltage and the power losses of power devices into account, on the basis of the existing researches on over-modulation, a specific over-modulation point that does not need zero vectors is applied to the weak magnetic modulation area, where the drive motor runs at a speed higher than the base speed. Moreover, the mathematical expressions of power losses are derived. The research result of this paper shows that, compared with the modulation method in the linear range, the proposed method can remarkably reduce the power losses of power devices in the inverter; meanwhile, the harmonic distortion is also acceptable.
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