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Auto-calibrating dc link current sensing technique for transformerless, grid connected, H-bridge inverter systems

Lookup NU author(s): Dr Matthew Armstrong, Dr Dave Atkinson, Dr Christopher Johnson, Dr Tusitha Abeyasekera

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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. © 2006 IEEE.

Publication metadata

Author(s): Armstrong M, Atkinson DJ, Johnson CM, Abeyasekera TD

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Power Electronics

Year: 2006

Volume: 21

Issue: 5

Pages: 1385-1393

Date deposited: 07/07/2010

ISSN (print): 0885-8993

ISSN (electronic): 1941-0107

Publisher: IEEE

URL: http://dx.doi.org/10.1109/TPEL.2006.880267

DOI: 10.1109/TPEL.2006.880267

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