These sub-pages have links to published papers and conference presentations.


  • Power electronics / power quality; active harmonic filtering
  • Substation automation and protection; IEC 61850 process bus and IEEE Std 1588 Precision Time Protocol.

Networked substation automation and protection

In 2013 I completed a PhD at the Queensland University of Technology in the area of advanced networking and time synchronisation in substations using Ethernet networks. This work assessed in detail the performance of IEC 61850-9-2 process buses, the IEEE Std 1588 Precision Time Protocol and the recent IEEE Std C37.238 PTP Power System Profile. The outcomes of this research have been published in a series of peer-reviewed journal and conference papers, the details of which can be found on the Publication Page with links to free downloads from QUT ePrints.

Citation and thesis download

Ingram, David M.E. (2013) Assessment of precision timing and real-time data networks for digital substation automation. PhD by Publication, Queensland University of Technology. Download the full thesis from QUT e-Prints


Final Seminar

Video of my Final Seminar (equivalent to a Thesis Defence at QUT) is available on YouTube. This is a 55 minute presentation (including questions) that combines the slide deck and narration.

Active harmonic filtering

I completed a Master of Engineering at the University of Canterbury in 1998 after researching harmonic identification algorithms for active harmonic filters. This work used a digital signal processor and field programmable gate array to implement an active filter using digital techniques to evaluate the methods.

Citation and thesis download

Ingram, David M.E. (1998) An Evaluation of Harmonic Isolation Techniques for Three Phase Active Filtering. Master of Engineering, University of Canterbury. Download the full thesis


  • Dr Simon Round, now with Hitachi Energy (formerly ABB) in Zurich Switzerland