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

The Korean Institute of Electrical Engineers (대한전기학회)
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Complex Vector Current Control of Grid Connected Inverter Robust for Inductance Variation

인덕턴스 변화에 강인한 계통연계형 인버터의 복소 벡터 전류제어기

  • Lee, Taejin (Dept. of Electrical Engineering, Chungnam National University) ;
  • Jo, Jongmin (Dept. of Electrical Engineering, Chungnam National University) ;
  • Shin, Changhoon (Dept. of Electrical Engineering, Chungnam National University) ;
  • Cha, Hanju (Dept. of Electrical Engineering, Chungnam National University)
  • Received : 2016.06.01
  • Accepted : 2016.09.13
  • Published : 2016.10.01
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Abstract

This paper analyzes complex vector current control for the enhanced cross-coupling compensation in accordance with parameter variation in grid-connected inverter system, and verifies through simulation and experiment. Complex vector current control is performed in the synchronous reference frame through d-q transformation. It generates cross-coupling components with rotating nominal angular frequency. In general, cross-coupling elements are compensated by decoupling terms added to output of conventional decoupling PI controller. But, it is impossible to compensate them perfectly which transient response is especially deteriorated such as large overshoot and slow tracking, when variation of grid impedance or measurement error occurs. However, complex vector current control can improve stability and response characteristic of current control regardless of the situation as before. Decoupling controller and complex vector controller are represented through complex forms, and these controllers are analyzed by using frequency response in s-domain, respectively. It is verified that complex vector controller has more superior response characteristic than decoupling controller through MATALB, PSIM and experimental in 5kW grid-connected inverter when L filter parameter is varied from 1.1mH to increase double, 2.2mH.

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References

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