Research

An important part of our activities is the research that we carry out together with universities and experts within the field. We are members of TC77/SC77A that are responsible for the development of the IEC 61000-4-30 standard defining the requirements of PQ analyzers now and tomorrow.

Unipower has also developed unique algorithms for classification of disturbances and tracing the source of flicker. These measuring methods are patented.

New technology for PQ measurements using auto-calibration on capacitive tap on inductive current transformers (2011)

The purpose of this project is to evaluate a new technology for measurements on the capacitive tap where harmonics, relative and absolute, unbalance and transients can be measured correctly. – Authors: Jonny Carlsson, Unipower AB; David Holmberg, Vattenfall AB; Jan Östlund, ABB AB

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Harmonic information management system (2009)

The trend of Harmonic measurements today is towards continuous monitoring with permanently installed meters. Long term monitoring of harmonics also provides effective means for planning. – Authors: Johan Adolfsson, Unipower AB; Peter S. Andersson, Unipower AB; Nilesh Chintalwar, PCI Ltd, India; Shital Shah, PCI Ltd, India

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Abstract - cired 2007, 19th international conference on electricity distribution

This abstract outlines a novel method for classifying the underlying causes of voltage disturbances using soft-margin Support Vector Machines (SVMs), a method that has significant advantages over conventional methods, such as artificial neural networks.

The experimental results show a high accuracy in classification (>98%).

The abstract was selected for presentation at CIRED 2007 in Vienna, May 21-24, 2007.

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Conference paper - cired, 18th international conference on electricity distribution, Turin, 6-9 June 2005

Paper describing a measurement method for determining the direction of flicker propagation and identifying flicker sources in the network. The paper was presented at CIRED as a part of a collaboration project between Unipower AB and Math Bollen, STRI.

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Conference paper - 4th international workshop on large-scale integration of wind power and transmission networks for offshore wind farms - Billund, Denmark, October 2003

The paper provides a brief description of measuring methods and results concerning the tracing of a flicker source.

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Measurement methods for calculating of the direction to a flicker source - Chalmers University of Technology, March 2003 (abstract)

This licentiate thesis is part of a bigger industrial doctorate project conducted by Unipower together with the Chalmers University of Technology and the University College of Borås.

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Conference paper - cired regional symposium & exhibition on electricity distribution 2002 - Kuala Lumpur, Malaysia, August 2002

The paper discusses measuring standards within the power quality field, with focus on IEC 61000-4-30.

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Research

New technology for PQ measurements using auto-calibration on capacitive tap on inductive current transformers (2011)

Harmonic information management system (2009)

Abstract - cired 2007, 19th international conference on electricity distribution

Conference paper - cired, 18th international conference on electricity distribution, Turin, 6-9 June 2005

Conference paper - 4th international workshop on large-scale integration of wind power and transmission networks for offshore wind farms - Billund, Denmark, October 2003

Measurement methods for calculating of the direction to a flicker source - Chalmers University of Technology, March 2003 (abstract)

Conference paper - cired regional symposium & exhibition on electricity distribution 2002 - Kuala Lumpur, Malaysia, August 2002

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