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DC component detection in grid connected inverter systems, using a mid-ground low pass filter approach

Lookup NU author(s): Weichi ZhangORCiD, Dr Matthew Armstrong, Dr Mohammed Elgendy


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© 2016, Institution of Engineering and Technology. All rights reserved.Transformer-less, grid connected, photovoltaic inverter systems are becoming increasingly popular due to their reduced volume and high efficiency performance. However, the potential risk of dc current injection into the grid is of significant concern in such systems, and strict guidelines and standards are normally in place to protect the integrity of the distribution network. Nevertheless, accurate determination of the dc current content in the inverter output is particularly challenging. This is primarily because the very small dc signals have to be extracted from much larger ac signals, and the measurements can be significantly influenced by noise. This paper investigates a novel method to detect small dc components in full-scale complex waveforms, using a simple low cost Mid-Ground Low Pass Filter (MGLPF) circuit. Results demonstrate the accuracy and robustness of the proposed circuit.

Publication metadata

Author(s): Zhang W, Armstrong M, Elgendy M

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

Year of Conference: 2016

Online publication date: 10/11/2016

Acceptance date: 02/04/2016

Publisher: Institution of Engineering and Technology


DOI: 10.1049/cp.2016.0207

Library holdings: Search Newcastle University Library for this item

Series Title: IET Conference Publications

ISBN: 9781785611889