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

The Korean Institute of Power Electronics (전력전자학회)
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Active Damping of LCL Filter for Three-phase PWM Inverter without Additional Hardware Sensors

추가적인 센서가 필요 없는 3상 PWM 인버터의 LCL 필터 능동댐핑

  • An, Byoung-Woong (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ of Transportation) ;
  • Shin, Hee-Keun (VC Tech, Engineer, R&D Center) ;
  • Kim, Hag-Wone (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ of Transportation) ;
  • Cho, Kwan-Yuhl (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ of Transportation) ;
  • Han, Byoung-Moon (Dept. of Electrical Eng., Myongji University)
  • Received : 2012.08.20
  • Accepted : 2012.11.01
  • Published : 2013.02.20
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Abstract

In this paper, a new active damping method of LCL filter without capacitor voltage sensors is proposed for 3 phase PWM Inverter. Normally, L filter or LCL filter is used as an output filter of grid connected PWM inverter. An LCL filter has more excellent performance than L filter to reduce harmonic current, so the small inductance value can be used. However, the resonance problem in LCL filter is happen due to the zero impedance by the addition of LC branch. To solve the resonance problem, the various active damping method has been proposed so far. Generally, the virtual resistor active damping methods is required to additional hardware sensors for measurement of capacitor voltage and current. In this paper, the new active damping method is proposed without any capacitor voltage or current sensors. In the proposed method, the resonance component of the capacitor voltage of LCL filter can be observed by a simple MRAS(Model Reference Adaptive System) observer without additional hardware sensors, and this component is suppressed by feedforward compensation. The validity of the proposed method is proven by simulation and experiment on the 3-phase PWM inverter system.

Keywords

References

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