DocumentCode :
1195453
Title :
Auto-Calibrating DC Link Current Sensing Technique for Transformerless, Grid Connected, H-Bridge Inverter Systems
Author :
Armstrong, Matthew ; Atkinson, David J. ; Johnson, C. Mark ; Abeyasekera, Tusitha D.
Author_Institution :
Dept. of Electr. & Electron. Eng., Newcastle upon Tyne Univ.
Volume :
21
Issue :
5
fYear :
2006
Firstpage :
1385
Lastpage :
1393
Abstract :
Power electronic inverters are commonly used for the interfacing of distributed generation systems to the electrical power network. These electronic inverters operate in a current controlled mode to inject unity power factor sinusoidal current into the network. To prevent possible dc current injection, a mains frequency isolation transformer is often employed at the inverter output. This isolation transformer is a costly component. An alternative approach is to use current sensing and control techniques to eliminate the dc current component. One method is to use a current controller to force the output dc current to zero. Current controllers are prone to errors associated with nonlinearity and offsets in the current transducers. This paper considers a novel auto-calibrating dc link current sensing technique that eliminates the errors associated with the current transducer, and helps avoid dc current injection into the grid when using a transformerless grid connect inverter system
Keywords :
bridge circuits; electric current control; electric sensing devices; invertors; power transformers; transducers; H-bridge inverter systems; autocalibrating DC link current sensing technique; current controlled mode; current transducers; dc current component elimination; frequency isolation transformer; power electronic inverters; transformerless grid connect inverter system; unity power factor injection; Capacitors; Circuit faults; Distributed control; Error correction; Force control; Frequency; Pulse power systems; Pulse width modulation; Pulse width modulation inverters; Reactive power; Current controllers; power electronic inverters;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2006.880267
Filename :
1687988
Link To Document :
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