Title
On-Line Variable Topology-Type Photovoltaic Grid-Connected Inverter
Abstract
In photovoltaic grid-connected generation system, the key focus is how to expand the generation range of the PV array and enhance the total efficiency of the system. This paper originally derived expressions of the total loss and grid current total harmonics distortions of cascaded inverter and H-bridge inverter under the conditions of variable output voltage and power of PV array. It is proved that, compared with H-bridge inverter, the operation range of the cascaded inverter is wider, while the total loss is larger. Furthermore, a novel online variable topology-type grid-connected inverter is proposed. A bidirectional power switch is introduced into the conventional cascaded inverter to connect the negative terminals of the PV arrays. When the output voltages of PV arrays are lower, the proposed inverter works under cascaded inverter mode to obtain wider generation range. When the output voltages of PV arrays are higher, the proposed inverter is transformed into equivalent H-bridge inverter mode to reduce the total loss. Thus, wider generation range and higher efficiency are both implemented. Specific demonstration of the proposed inverter based on fivelevel cascaded inverter is presented. The detailed experimental results verify the accuracy and feasibility of the theoretical analysis and proposed inverter topology.
Year
DOI
Venue
2015
10.1109/TIE.2015.2405052
Industrial Electronics, IEEE Transactions  
Keywords
Field
DocType
Inverters,Insulated gate bipolar transistors,Inductors,Arrays,Switches,Topology,Iron
Grid-connected photovoltaic power system,Inverter,Control theory,Voltage,Grid-tie inverter,Maximum power point tracking,Inductor,Control engineering,Electronic engineering,Harmonics,Engineering,Photovoltaic system
Journal
Volume
Issue
ISSN
PP
99
0278-0046
Citations 
PageRank 
References 
3
0.48
6
Authors
4
Name
Order
Citations
PageRank
Fengjiang Wu1336.68
Sun, B.230.48
Jiandong Duan3203.12
Zhao, K.430.48