| Title |
Islanding Detection Method for Grid-connected PV System using Automatic Phase-shift |
| Authors |
Jung-Hyeok Yun ; Heung-Geun Kim ; Jong-Woo Choi ; Jung-Hun So ; Gwon-Jong Yu |
| Keywords |
Islanding of PV systems; Grid-connected PV system; Islanding detection method; Automatic phase-shift |
| Abstract |
The high efficiency full-bridge LLC resonant converter using a contact-less transformer is proposed for the photovoltaic power generation system. For the series resonance with a series capacitor, the LLC resonant converter utilizes the leakage inductance and magnetizing inductance of a contact-less transformer Unlike the conventional series resonant converter operated to the continuous resonant current at above resonance frequency, the proposed converter operates to the discontinuous resonant current at the narrow frequency control range below resonance frequency. Due to the discontinuous mode resonant current, the proposed converter can be achieved the zero voltage switching (ZVS) in the primary switches and the zero current switching (ZCS) in the secondary rectification diodes without any auxiliary circuit. In this paper, the experimental results of the proposed full-bridge LLC resonant converter using a contact-less transformer are verified on the simulation based on the theoretical analysis and the 150W experimental prototype. |