The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Improvement of Modulation Index in 3-phase Inverters using Shunt Resistors

션트저항을 이용한 3상 인버터의 전압 변조지수 증대

  • Kim, Jung-Dae (R&D Center, MOTONIC, Co., Ltd.) ;
  • Choi, Jong-Woo (Department of Electrical Engineering, College of IT Engineering, Kyungpook National University)
  • Received : 2017.08.04
  • Accepted : 2018.01.05
  • Published : 2018.03.01
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Abstract

This paper has done a hardware-based approach to increase the modulation index in 3-phase inverters, unlike the conventional software algorithm-based approaches. The minimum required time to measure the currents in a three-phase inverters with shunt resistors has also been analyzed. By the analysis, the longest time in minimum required time is AD conversion time. To shorten the minimum required time, this paper proposed a sample-and-hold(S/H) circuit implemented at the inverter current signal output to retain the current signal. When the linear operation region of an inverter with S/H was compared with that without it, the modulation index was increased by 7.8 %. Inverters with S/H circuits can employ the traditional software algorithms, such as the voltage injection method or current restoration method, and it will yield further increase the modulation index.

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References

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