Realization/calibration of the absolute phase/phasors
| Reference number | |
| Coordinator | RISE Research Institutes of Sweden AB - SP Sveriges Tekniska Forskningsinstitut AB |
| Funding from Vinnova | SEK 970 000 |
| Project duration | August 2016 - March 2018 |
| Status | Completed |
Purpose and goal
The project provides traceability for "absolute phase angle" or "phasor" and hence calibration of phasor measurement units that meet the set accuracy requirement, ±100 ns. The PMU calibrator consists of a modified three-phase voltage and power source and a fast ADC system, 25 Msps @ 14bit MHz, synchronized to Swedish standard time. Quick sampling allows you to measure both 50 Hz signals and time references, which improves the ability to determine time errors. For signal matching, coaxial power shunts and voltage dividers and a scanner are used.
Expected results and effects
The PMU calibrator system has been built and equipped with adequate software. Its parts have been calibrated and the accuracy has been evaluated for these parts. The PMU calibrator is expected to be able to calibrate PMUs with an accuracy of 100 ns versus UTC (SP), Swedish standard time, which allows calibration of PMUs as well as other PMU calibrators with sufficient accuracy.
Planned approach and implementation
The project is based on a collaboration between the Electric Power and Energy Group, as well as the Group of Time, Frequency and Communication. One effect of the project is an increased understanding of both groups for similarities and differences in techniques for measuring signals in different frequency ranges. The project has been completed in about 1.5 years and needed some extra time to complete the project, partly because of the relatively short project period and partly due to the underestimation of lead times.