Recommendations for static electricity meters beyond standards requirements

Rights statement
Awarding institution
  • University of Strathclyde
Date of award
  • 2022
Thesis identifier
  • T16309
Person Identifier (Local)
  • 201693487
Qualification Level
Qualification Name
Department, School or Faculty
  • The ongoing smart grid transition involves large-scale integration of power electronic converters, along with intelligence gained from the transfer of measurement information at all levels of the grid. This requires an accurate response of electricity meters, which must be designed to cater for present and future power network conditions. In particular, the accuracy of electricity meters under nonsinusoidal conditions is critical for industry and electricity consumers. Numerous studies have been conducted in order to identify the causes of erroneous measurements reported by static electricity meters when exposed to nonsinusoidal voltage and current signals, but there is a gap in these studies relating to nonsinusoidal situations. This thesis addresses this gap by providing a clear understanding of static electricity meter response to nonsinusoidal signals from typical power electronic equipment in modern grids. The thesis proposes a methodology for testing the accuracy of electricity meters beyond standard requirements, including a set of waveforms with fast-changing waveform phenomena. The results of applying such waveforms exposes limitations in energy metering integrated circuit (IC) technology produced by its internal components. An important contribution of this thesis is the detailed investigation of the impact of crest factor and power factor in metering error. This thesis proposes, for the first time, a new type of test designed to provide a consistent method for comparing metering IC capabilities, and to define the limits of accurate operation. This work can be used as a starting point to define future standards for evaluating the accuracy of static electricity meters and current transducers exposed to realistic fast-changing currents. Furthermore, this thesis proposes a novel method for compensating the errors in measurements reported by electricity meters under certain nonsinusoidal conditions. This contribution thereby provides a practical solution to address the identified drop in performance, which will ensure the robust operation of meters even under extreme operating conditions in future grids.
Advisor / supervisor
  • Blair, Steven
  • Burt, Graeme
Resource Type