The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Average Phase Current Estimation Method using a DC Link Shunt Resistor in the Three-Phase Inverter

3상 인버터에서의 직류단 단일 션트 저항을 이용한 평균 상전류 추정 방법

  • Ku, Hyun-Keun (Dept. of Electrical Engineering, Pusan National University) ;
  • Yeom, Han-Beom (Advanced Control Research 1 Team, LG Electronics) ;
  • Kim, Jang-Mok (Dept. of Electrical Engineering, Pusan National University)
  • Received : 2015.11.06
  • Accepted : 2016.06.26
  • Published : 2016.08.20
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Abstract

Generally, the average phase current is sampled at the midpoint of a PWM signal for the vector control of an AC motor. The three-phase current can also be reconstructed from a DC-link shunt resistor by sampling the shunt voltage during the active vectors of the SVPWM. However, the reconstructed current is different from the average current because of the deviation of the sampling point from the midpoint of the PWM signal. This paper proposes an algorithm to estimate the average current from the reconstructed current in a single-shunt inverter. The proposed method is derived from the phase current slopes based on switching states and corresponding switching time. In addition, the proposed method is generalized for all the six sectors of the space vector hexagon. The validity of the proposed algorithm is verified with simulations and experiments.

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References

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