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Performance Evaluation of PMU with IEC 61850 Sampled Values

Explore the application and testing of Phasor Measurement Units with Sampled Values in digital substations, assessing performance under various scenarios and real system measurements.

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Performance Evaluation of PMU with IEC 61850 Sampled Values

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  1. Performance evaluation of Phasor Measurement Units for digital substations(PMU with IEC 61850 sampled values) Harsh Vardhan harsh.vardhan@alstom.com

  2. Objectives • Application of IEC 61850 Process Bus in Synchronized Phasor Measurements Systems • Assembly and testing of a PMU using Sampled Values (SV) for acquiring data • Presentation and discussion of test results for "PMU with SV“ under different scenarios • Real electrical system measurements at low voltage (MedFasee Project) • under Normal system operation • under disturbance • Laboratory tests

  3. The Digital Substation PMU with SV

  4. The Merging Unit • IEC 61850-9-2LE sampled values (SV) and IEC 61850-8-1 GOOSE interface • Operates with protection profiles (80 samples/cycle) and measuring (256 samples/cycle) • Sampling stability guaranteed by hardware • Synchronization via Ethernet PTPv2 or via IRIG-B • Use of VLANs and priority tags (802.1Q)

  5. IEEE C37.118.1-2011 definitions • TVE (Total Vector Error): • FE (Frequency Error): • RFE (Rate of Change of Frequency Error):

  6. Assessment Standards - Dynamic Testing • Delay time: • Transition delay of the measured variables • Response time: • Errors stabilization time Source: IEEE C37.118.1-2011

  7. Test System • Architecture: • Comparison of Synchrophasors measured by the "PMU with SV" and the “conventional PMU” • System under normal operation conditions • System under disturbance

  8. Measurements - Normal System Operation 0.01% 0.31 deg

  9. Measurements - Normal System Operation 1.7mHz

  10. Measurements - Under Disturbance

  11. Measurements - Under Disturbance

  12. Measurements - Under Disturbance

  13. Laboratory Tests • Rates: 20 FPS 60 FPS • Class M • limits: IEEE C37.118.1-2011 C37.118.1a IEEE-2014 • Steady state test: Change Frequency, and Angle Module • Dynamic test: Step magnitude and Angle • MU SV profiles: Protection Profile (PP) – 80 samples/cycle Measuring profile (PM) - 256 samples/cycle Architecture

  14. Laboratory Tests Frequency range: 55 Hz to 65 Hz (1 Hz steps)

  15. Laboratory Tests Magnitude and angle Variations: 10% to 120% Vn 10% 200% In Observation: Larger TVEs found at lower current levels (10% In).

  16. Laboratory Tests Magnitude and angle Variations - 20 FPS:

  17. Laboratory Tests Magnitude and angle Variations - 60 FPS:

  18. Key Findings • Feasibility of using MU in SMSF • The "PMU with SV" reproduced faithfully the Synchrophasors measured by “conventional PMU” in various power system operating conditions and in laboratory tests. • The measurement profile (PPC 256) proved the most suitable for use with PMUs • Larger TVEs found at lower current levels (10% In). • PMUs using SV (IEC 61850-9-2LE) allows the calculation of Synchrophasors from optical Instrument Transformers • Since 02/2014 the Synchrophasors at the "UFSC" point in the SMSF BT MedFasee project are measured by a "PMU with MU"

  19. Thank You! Questions?

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