The Transactions of the Korean Institute of Electrical Engineers P (전기학회논문지P)

The Korean Institute of Electrical Engineers (대한전기학회)
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DC-Link Voltage Unbalancing Compensation of Four-Switch Inverter for Three-Phase BLDC Motor Drive

3상 BLDC 전동기 구동을 위한 4-스위치 인버터의 DC-Link 전압 불평형 보상

  • 박상훈 (성균관대학교 메카트로닉스협동과정) ;
  • 윤용호 (삼성탈레스 종합연구소 메카트로닉스그룹 전력전자팀) ;
  • 이병국 (성균관대학교 정보통신공학부) ;
  • 이수원 (성균관대학교 BK21) ;
  • 원충연 (성균관대학교 정보통신공학부)
  • Published : 2009.12.01
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Abstract

In this paper, a control algorithm for DC-Link voltage unbalancing compensation of a four-switch inverter for a three-phase BLDC motor drive is proposed. Compared with a conventional six-switch inverter, the split source of the four-switch inverter can be obtained by splitting DC-link capacitor into two capacitors to drive the three phase BLDC motor. The voltages across each of two capacitors are not always equal in steady state because of the unbalance in the impedance of the DC-link capacitors $C_1$ and $C_2$ or the variable current flowed into the capacitor's neutral point in motor control. Despite the unbalance, if the BLDC motor may be run for a long time the voltage across one of the capacitors is more increased. So the unbalance in the capacitors voltages will be accelerated. As a result, The current ripple and torque ripple is increased due to the fluctuation of input current which flows into 3-phase BLDC motor. According to that, the vibration of motor will be increased and the whole system will be instable. This paper presents a control algorithm for DC-Link voltage unbalancing compensation. The sampling from the voltages across each of two capacitors is used to perform the voltage control of DC-Link by using the feedforward controller.

Keywords

References

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