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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



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


DOI: 10.1109/TPEL.2006.880267


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