Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Optimized LCL filter Design Method of Utility Interactive Inverter
Authors Sang-Hyuk Jung ; Se-Wan Choi
DOI 10.6113/TKPE/2013.18.1.103
Page pp.103-109
ISSN 1229-2214
Keywords optimized LCL filter design method; LCL filter; utility-interactive inverter; weighting factor; critical load
Abstract The conventional LCL filter design method of the utility interactive inverter considers only harmonics attenuation of the current injected to the grid. However, in case of utility-interactive inverter with critical load the voltage quality of the critical load should also be considered for LCL filter design. Also, considering cost and volume of LCL filters. it is important to have minimum values of inductance and capacitance as far as the harmonic standards are satisfied. In this paper a LCL filter design method is proposed to satisfy not only the harmonic standards of the grid current during the grid-connected mode but the voltage quality of the critical load during grid-connected mode and stand-alone mode. With the proposed method optimized values of LCL filters could be obtained by applying weighting factor to voltage ripple across the critical load, inductor volume, amount of reactive current and system bandwidth.