Auto-Calibrating DC Link Current Sensing Technique for Transformerless, Grid Connected, H-Bridge Inverter Systems

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 injecti...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2006-09, Vol.21 (5), p.1385-1393
Main Authors: Armstrong, M., Atkinson, David.J., Johnson, C.M., Abeyasekera, T.D.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit faults
Circuits
Controllers
Current controllers
Current injection
Detection
Direct current
Distributed control
Electric currents
Electric power
Electric power generation
Electrical engineering. Electrical power engineering
Electronics
Error correction
Exact sciences and technology
Force control
Frequency
Inverters
Networks
power electronic inverters
Power electronics, power supplies
Pulse power systems
Pulse width modulation
Pulse width modulation inverters
Reactive power
Transducers
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Summary: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
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2006.880267