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Harsh Vardhan harsh.vardhan@alstom

Performance evaluation of Phasor Measurement Units for digital substations (PMU with IEC 61850 sampled values). Harsh Vardhan harsh.vardhan@alstom.com. Objectives. Application of IEC 61850 Process Bus in Synchronized Phasor Measurements Systems

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Harsh Vardhan harsh.vardhan@alstom

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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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