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The study on DC-link Film Capacitor in 3 Phase Inverter System for the Consideration of Frequency Response

3상 인버터 시스템에서 주파수 특성을 고려한 필름 콘덴서의 DC-link 적용 방법에 관한 연구

  • Park, Hyun-Soo (Division of Electrical Engineering, Kyungil University)
  • 박현수 (경일대학교 전기공학부)
  • Received : 2018.01.24
  • Accepted : 2018.04.06
  • Published : 2018.04.30

Abstract

A large-capacity three-phase system air conditioner recently includes an inverter circuit to reduce power consumption. The inverter circuit uses a DC voltage that comes from DC-link power capacitor with the function of rectifying, which means AC voltage to DC voltage using a diode. An electrolytic capacitor is generally used to satisfy the voltage ripple and current ripple conditions of a DC-link power capacitor used for rectifying. Reducing the capacitance of the capacitor decreases the size, weight, and cost of the circuit. This paper proposes an algorithm to reduce the input ripple current by combining the minimum point estimation phase locked loop (PLL) phase control and the average voltage d axis current control technique. When this algorithm was used, the input ripple current decreased by almost 90%. The current ripple of the DC-link capacitor decreased due to the decrease in input ripple current. The capacitor capacity can be reduced but the electrolytic capacitor has a heat generation problem and life-time limitations because of its large equivalent series resistance (ESR). This paper proposes a method to select a film capacitor considering the current ripple at DC-link stage instead of an electrolytic capacitor. The capacitance was selected considering the voltage limitation, RMS (Root Mean Square) current capacity, and RMS current frequency analysis. A $1680{\mu}F$ electrolytic capacitor can be reduced to a $20{\mu}F$ film capacitor, which has the benefit of size, weight and cost. These results were verified by motor operation.

Keywords

DC-link;Film Capacitor;Frequency Response;Inverter;RMS current

References

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