Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title DC-link Voltage Control of Grid Connected PV System using Quasi Z-Source Inverter
Authors Jong-Hyoung Park ; Heung-Geun Kim ; Eui-Cheol Nho ; Tae-Won Chun ; Honnyong Cha
DOI 10.6113/TKPE/2014.19.3.201
Page pp.201-210
ISSN 1229-2214
Keywords grid connected quasi z-source inverter(QZSI) system; photovoltaic system; shoot-through; maximum power point tracking(MPPT); impedance network; LCL filter; resonanace control; harmonics compensation
Abstract In this paper, dc-link voltage control of a grid-connected QZSI is presented. Since the input current of the ZSI is discontinuous, a capacity with relatively large capacitance should be connected to the output of the PV array in order to reduce the current ripple. Due to the presence of the impedance network inductor in series with the PV array, the QZSI can achieve continuous input current flow. Several dc-link voltage control methods are compared and the method for power quality improvement is also presented. The performance of the proposed method is verified through both simulation and experimental results.