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; Jee-Hoon Jung

Design Methodology of Passive Damped LCL Filter Using Current Controller for Grid-Connected Three-Phase Voltage-Source Inverters

Vol. 18, No. 4, pp. 1178-1189, Jul. 2018

10.6113/JPE.2018.18.4.1178

Voltage-source inverters

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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.

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Cite this article

[IEEE Style]

J. Lee, Y. Cho, H. Kim, J. Jung, "Design Methodology of Passive Damped LCL Filter Using Current Controller for Grid-Connected Three-Phase Voltage-Source Inverters," Journal of Power Electronics, vol. 18, no. 4, pp. 1178-1189, 2018. DOI: 10.6113/JPE.2018.18.4.1178.

[ACM Style]

Jun-Young Lee, Young-Pyo Cho, Ho-Sung Kim, and Jee-Hoon Jung. 2018. Design Methodology of Passive Damped LCL Filter Using Current Controller for Grid-Connected Three-Phase Voltage-Source Inverters. Journal of Power Electronics, 18, 4, (2018), 1178-1189. DOI: 10.6113/JPE.2018.18.4.1178.