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Development of measurement algorithm in an industrial PLC: An evaluation of DSOGI-PLL for real time measurements
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this project was to devise an algorithm for three phase AC power grid measurements that could be utilized in an excitation system for controlling generators. This application requires fast and accurate measurements even when the voltages in the power grid are characterized by unbalanced three-phase, frequency variations and harmonic distortions. Phase locked loop algorithms are used in grid synchronization techniques and are developed to withstand disturbances in the power grid. A DSOGI-PLL was implemented on a PLC and then evaluated. The DSOGI-PLL was tested with input voltages generated by a relay testing system. The result showed that the DSOGI-PLL could measure positive sequence component RMS and grid frequency of unbalanced three-phase voltages and voltages characterized by frequency variations and harmonic distortions. However, the measurements response time and accuracy did not meet the requirements for application in excitation systems. 

Place, publisher, year, edition, pages
2019. , p. 27
Series
UPTEC ES, ISSN 1650-8300 ; 19017
Keywords [en]
Phase locked loop, DSOGI-PLL, Symmetrical component extraction, Measurement algorithm
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-388490OAI: oai:DiVA.org:uu-388490DiVA, id: diva2:1333402
External cooperation
Svea Power
Educational program
Master Programme in Energy Systems Engineering
Supervisors
Examiners
Available from: 2019-08-19 Created: 2019-07-01 Last updated: 2019-08-19Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
  • en-GB
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  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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