Exploring the relative performance of frequency-tracking and fixed-filter phasor measurement unit algorithms under C37.118 test procedures, the effects of interharmonics, and initial attempts at merging P-class response with M-class filtering

Andrew Roscoe

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

This paper presents improvements to frequency-tracking P-class and M-class Phasor Measurement Unit (PMU) algorithms. The performance of these algorithms is tested in simulation against the reference (Basic) algorithms from the C37.118 standard, using the formal test procedures specified in that standard. The measurements of Total Vector Error (TVE), frequency and rate-of-change-of-frequency (ROCOF) are all investigated for compliance. Generally, Total Vector Error (TVE) is found to be compliant for all algorithms. By contrast there are significant excursions for frequency and rate-of-change-of-frequency (ROCOF) measurements. More extreme non-standard tests are also applied, involving multiple simultaneous interferences. The proposed algorithms exhibit improvements in frequency and ROCOF accuracy, with errors reduced by factors of up to 150 compared to the Basic algorithms. A Hybrid P/M class PMU is proposed and demonstrated, offering P-class response to dynamic steps but M-class steady-state accuracy. However, setting usable trigger thresholds for this device requires a thorough investigation of interharmonic effects on P-class PMUs. This investigation poses more questions than it answers, leading to a questioning of the validity of any frequency or ROCOF measurement from any P-class PMU
LanguageEnglish
Pages2140-2153
Number of pages14
JournalIEEE Transactions on Instrumentation and Measurement
Volume62
Issue number8
Early online date26 Jun 2013
DOIs
Publication statusPublished - Aug 2013

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Phasor measurement units
Merging
filters
frequency measurement
actuators
interference
thresholds

Keywords

  • power system measurements
  • fourier transforms
  • frequency measurement
  • phase estimation
  • power system stability

Cite this

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title = "Exploring the relative performance of frequency-tracking and fixed-filter phasor measurement unit algorithms under C37.118 test procedures, the effects of interharmonics, and initial attempts at merging P-class response with M-class filtering",
abstract = "This paper presents improvements to frequency-tracking P-class and M-class Phasor Measurement Unit (PMU) algorithms. The performance of these algorithms is tested in simulation against the reference (Basic) algorithms from the C37.118 standard, using the formal test procedures specified in that standard. The measurements of Total Vector Error (TVE), frequency and rate-of-change-of-frequency (ROCOF) are all investigated for compliance. Generally, Total Vector Error (TVE) is found to be compliant for all algorithms. By contrast there are significant excursions for frequency and rate-of-change-of-frequency (ROCOF) measurements. More extreme non-standard tests are also applied, involving multiple simultaneous interferences. The proposed algorithms exhibit improvements in frequency and ROCOF accuracy, with errors reduced by factors of up to 150 compared to the Basic algorithms. A Hybrid P/M class PMU is proposed and demonstrated, offering P-class response to dynamic steps but M-class steady-state accuracy. However, setting usable trigger thresholds for this device requires a thorough investigation of interharmonic effects on P-class PMUs. This investigation poses more questions than it answers, leading to a questioning of the validity of any frequency or ROCOF measurement from any P-class PMU",
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AB - This paper presents improvements to frequency-tracking P-class and M-class Phasor Measurement Unit (PMU) algorithms. The performance of these algorithms is tested in simulation against the reference (Basic) algorithms from the C37.118 standard, using the formal test procedures specified in that standard. The measurements of Total Vector Error (TVE), frequency and rate-of-change-of-frequency (ROCOF) are all investigated for compliance. Generally, Total Vector Error (TVE) is found to be compliant for all algorithms. By contrast there are significant excursions for frequency and rate-of-change-of-frequency (ROCOF) measurements. More extreme non-standard tests are also applied, involving multiple simultaneous interferences. The proposed algorithms exhibit improvements in frequency and ROCOF accuracy, with errors reduced by factors of up to 150 compared to the Basic algorithms. A Hybrid P/M class PMU is proposed and demonstrated, offering P-class response to dynamic steps but M-class steady-state accuracy. However, setting usable trigger thresholds for this device requires a thorough investigation of interharmonic effects on P-class PMUs. This investigation poses more questions than it answers, leading to a questioning of the validity of any frequency or ROCOF measurement from any P-class PMU

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