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http://dx.doi.org/10.6113/JPE.2018.18.4.1178

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)
Publication Information
Journal of Power Electronics / v.18, no.4, 2018 , pp. 1178-1189 More about this Journal
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
Current control; LCL filters; Passive damping; Stability analysis; Voltage-source inverters;
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