A Novel Modular Positive-Sequence Synchrophasor Estimation Algorithm for PMUs

ING. FRANCISCO MESSINA; ING. PABLO G. MARCHI; DR. LEONARDO REY VEGA; DRA. CECILIA G. GALARZA; ING. HECTOR LAIZ

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2017 vol. 66 p. 1164 - 1175

0018-9456

A novel modular positive-sequence estimationalgorithm for phasor measurement units (PMUs) is describedin this paper with a focus on the restrictions imposed by theIEEE C37.118.1-2011 standard. The first stage consists in athree-phase demodulator which allows us to separate the positive-sequencefrom the negative-sequence signal in the frequencydomain and to eliminate the zero-sequence signal. The secondstage is a prefilter that mitigates noise and interference, thusrelaxing the filtering requirements of the following stage. Thesuitability of a linear-phase FIR filter is shown and a comparisonof single and multistage designs is presented. On the third stage,a digital state-space-based extension of a synchronous referenceframe-phase-locked loop is used for tracking of amplitude,phase, frequency, and rate of change of frequency. It is shownthat a phase predictor inside the loop is required. The fourthstage is a compensation algorithm which takes into account thenarrowband nature of the input signal to perform an accuratecompensation of the filter effects on the signal of interest.Analytical properties of the system are then presented, providinginsight into the main factors that affect global performance.Finally, a strict evaluation of the system is presented forboth M and P class PMU.