Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Design Methodology of Passive Damped LCL Filter Using Current Controller for Grid-Connected Three-Phase Voltage-Source Inverters

  • Lee, Jun-Young (School of Electrical Engineering, Ulsan National Institute of Science and Technology) ;
  • Cho, Young-Pyo (Smart-Grid Group Power Distribution Lab, KEPCO Research Institute) ;
  • Kim, Ho-Sung (Power Conversion and Control Research Center, HVDC Research Division, KERI) ;
  • Jung, Jee-Hoon (School of Electrical Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2017.08.17
  • Accepted : 2018.04.16
  • Published : 2018.07.20
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Abstract

In grid-connected voltage-source inverters (VSIs), when compared with a simple inductive L filter, the LCL filter has a better performance in attenuating the high frequency harmonics caused by the pulse-width modulation of power switches. However, the resonance peaks generated by the filter inductors and capacitors can make a system unstable. In terms of simplicity and filter design cost, a passive damping method is generally preferred. However, its high power loss and degradation in high frequency harmonic attenuation are significant demerits. In this paper, a mathematical design solution for a passive LCL filter to derive filter parameters suppressing the high frequency current harmonics to 0.3% is proposed. The minimum filter inductance can be obtained to reduce the size of the filter. Furthermore, a minimum damping resistance design considering a current controller is analyzed for a stable closed-loop system. The proposed design method is verified by experimental results using a 5-kW three-phase prototype inverter.

Keywords

References

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