Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.7.2 Case Study-39: Computation of Frequency Response CharacteristicsSynchrophasor frequency data has been used for computation of frequency responsecharacteristics. The frequency, prior and after the event, is accurately obtained with the help ofPMU frequency data.Figure 130: Hisar frequency during generation loss of 1100MW at Khedar TPS in HaryanaFigure 130 shows the frequency recorded by Hisar PMU during event of generation loss of 1100MW at Khedar TPS in Haryana. The frequency profile indicates a generation loss. Frequency,before and after the incident, was obtained from PMU frequency plot for computation of FRC. Inthis particular event the FRC for the interconnected system is 2444 MW/Hz.POSOCO Page 126 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20126 CHAPTER 6: SUMMARY OF APPLICATION OF SYNCHROPHASORS6.1 Utilization of Synchrophasor in real-timeThe synchrophasor data is currently being used in different regions for the followingapplications:i). Situational awareness through real time monitoring of frequency, df/dt, angular separationand voltage.ii). Occurrence of transmission line tripping/ revival within a flowgate by observing:• Step change in angular separation, voltage magnitude• Step change in line current (MW & MVAR)iii). Occurrence of generator tripping by observing:• Frequency decline• Increase in df/dt• Change in angular separation• Decrease in voltage magnitudeiv). Occurrence of autoreclosure by change in df/dt.v). Occurrence of load crash/ load throw off by observing• Sustained High frequency• Sustained abnormal phase angle separation• Sustained High voltagevi). Help in subsystem synchronization during restoration by using standing phase angleseparation and phase sequenceTable 17: Real-time applications of PMU dataTimeframeApplicationDescriptionCaseStudyNo.Visualization of- Magnitude, angle of all three voltage/current phasorRealtimeEnhancingsituationalawareness- Sequence components of voltage/current phasor- Frequency & Frequency difference- Rate of change of frequencyCaseStudy-1 to 5- Angular separation between pair of nodes- 1-phase auto reclosing in EHV transmission linePOSOCO Page 127 of 143
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Synchrophasor Initiative in India - erldc

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