Filter design masks for C37.118.1a-compliant frequency-tracking and fixed-filter M-class Phasor Measurement Units (PMUs)

Andrew J. Roscoe, Bill Dickerson, Kenneth E. Martin

Research output: Contribution to journalArticle

15 Citations (Scopus)
151 Downloads (Pure)

Abstract

The new amendment to the Phasor Measurement Unit (PMU) standard C37.118.1a makes several significant changes, compared to the standard C37.118.1 (2011). This paper highlights some of the most important changes, with a particular emphasis applied to how those changes relate to the way that an M-class PMU filter needs to be designed. In particular, there is a delicate trade-off between passband flatness (the bandwidth test) and stopband rejection in the Out-Of-Band (OOB) test. For a PMU algorithm using frequency-tracking and adaptive filters, it is shown that passband flatness can be relaxed to about 2.5dB, but that the stopband needs to begin up to 14.8% closer to 0 Hz than for a fixed-filter PMU. This is partly due to the exact procedures of the C37.118.1a “OOB” testing, and partly due to the adaptive nature of a frequency-tracking PMU filter section. Both the above lead to modified filter masks being required for frequency-tracking devices, compared to the mask required for fixed-filter devices. The M-class PMU with reporting rate 25Hz is the most difficult to design, for reasons given in this paper. The validity of the masks is shown using filter bode plots and simulated C37.118.1a test results of a fixed-filter and frequency-tracking device which have been designed to meet the masks defined in this paper.
Original languageEnglish
Pages (from-to)2096-2107
Number of pages12
JournalIEEE Transactions on Instrumentation and Measurement
Volume64
Issue number8
Early online date25 Jun 2015
DOIs
Publication statusPublished - Aug 2015

Keywords

  • power system measurement
  • fourier transforms
  • frequency measurement
  • power system faults
  • phase estimation
  • phasor measurement unit (PMU)

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