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JPE, Vol. 18, No. 4, July 2018
Design Methodology of Passive Damped LCL Filter Using Current Controller for Grid-Connected Three-Phase Voltage-Source Inverters
Jun-Young Lee, Young-Pyo Cho, Ho-Sung Kim, and Jee-Hoon Jung
Area Analysis, Modeling and Control
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.
Keyword Current control,LCL filters,Passive damping,Stability analysis,Voltage-source inverters
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