Title :
Unidirectional duck DC-DC converter mode photovoltaic grid-connected inverters with high frequency link
Author :
Jie Zhang ; Fusong Huang ; Bin Yan ; Daolian Chen
Author_Institution :
Power Electron. & Drives Inst., Fuzhou Univ., Fuzhou, China
Abstract :
A circuit configuration and circuit topological family of unidirectional buck dc-dc converter mode photovoltaic grid-connected inverters with high frequency link (HFL) are proposed in this paper. Its circuit configuration is composed of the photovoltaic (PV) array, the unidirectional isolated buck dc-dc converter and polarity reversal inverting bridge. The circuit topology, the maximum power point tracking (MPPT) methods, dual-loop PWM control strategy with the input voltage as outer loop and the output current as inner loop, and design criteria for the key circuit parameters are deeply investigated. Taking push-pull forward mode topology as an example, make the photovoltaic power generation experiment on the unidirectional buck dc-dc converter mode photovoltaic grid-connected inverter system with high frequency link. The simulation and experiment results have shown that this kind of inverter have the advantages such as high frequency (HF) electrical isolation, quasi single-stage power conversion, accurate MPPT, low voltage stress and ZVZCS of the power switches in the polarity reversal inverting bridge, high conversion efficiency, high quality grid-connected current etc.
Keywords :
PWM power convertors; bridge circuits; invertors; maximum power point trackers; photovoltaic power systems; power grids; solar cell arrays; HF electrical isolation; HFL; MPPT; PV array; ZVZCS; circuit parameter; circuit topology; dual-loop PWM control strategy; high frequency electrical isolation; high frequency link; low voltage stress; maximum power point tracking method; photovoltaic array; photovoltaic grid-connected inverter; photovoltaic power generation experiment; polarity reversal inverting bridge; power switch; push-pull forward mode topology; quasi single-stage power conversion; unidirectional buck dc-dc converter mode; Hafnium; Inverters; Photovoltaic systems; Switches; Topology;
Conference_Titel :
Future Energy Electronics Conference (IFEEC), 2013 1st International
Conference_Location :
Tainan
Print_ISBN :
978-1-4799-0071-8
DOI :
10.1109/IFEEC.2013.6687534