Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title High-Efficiency DC-DC Converter with Improved Dynamic Response Characteristics for Modular Photovoltaic Power Conversion
Authors Jae-Yeon Choi ; Woo-Young Choi
DOI 10.6113/TKPE/2013.18.1.54
Page pp.54-62
ISSN 1229-2214
Keywords dynamic response; photovoltaic (PV); power efficiency
Abstract This paper proposes a high-efficiency DC-DC converter with improved dynamic response characteristics for modular photovoltaic power conversion. High power efficiency is achieved by reducing switching power losses of the DC-DC converter. The voltage stress of power switches is reduced at primary side. Zero-current switching of output diodes is achieved at secondary side. A modified proportional and integral controller is suggested to improve the dynamic responses of the DC-DC converter. The performance of the proposed converter is verified based on a 200 [W] modular power conversion system including the grid-tied DC-AC inverter. The proposed DC-DC converter achieves the efficiency of 97.9 % at 60 [V] input voltage for a 200 [W] output power. The overall system including DC-DC converter and DC-AC inverter achieves the efficiency of 93.0 % when 200 [W] power is supplied into the grid.