Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012Figure 93: Oscillations in Hisar Bawana flowFigure 91, 92, 93 shows the PMU plots for frequency, 400kV Hisar bus voltage and 400kVHisar-Bawana power flow. One of four outgoing lines from Jhakri complex had tripped on 16 thJuly 2011 at 4:28 hrs and the SPS operation got delayed by around 10 seconds. Oscillationswere observed for around 10 seconds when the flow on the remaining three evacuating lineswas around 800MW. Upon operation of SPS after 10 seconds i.e., tripping of units at KarchamHydro station (frequency dip) the oscillations died down. Hence PMU data validated the transfercapability and installation of SPS for reliable evacuation of power from the Jhakri-Baspa-Karcham generation complex.POSOCO Page 98 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.6.2 Case Study-30: Oscillation with single ckt of 765 kV Tehri-Meerut D/CTehri HEP had reported that oscillations were observed at their station whenever only one out ofthe two circuits of the 765kV Tehri-Meerut line (charged at 400 kV) is in service and thegeneration at Tehri HEP exceeded 700 MW.Figure 94: Connectivity diagram of Tehri Hydro stationFigure 94 shows the connectivity diagram of Tehri Hydro station in Northern regionAn exercise was carried out on 3rd Feb 2011 from 11.25 hrs to 11.35 hrs to examine theoscillation phenomenon and ascertain the loadability of the line. Unit # 4 of Tehri HEP wassynchronized at 11:25 Hrs of 03rd February 2011. The 765 kV Tehri-Koteshwar-Meerut ckt#1was out of service and only 765kV Tehri-Meerut ckt # 2 was in service. Generation at Tehri HEPwas increased to increase the power flow of this line upto 1050 MW. The synchrophasor datawas analyzed for the event.POSOCO Page 99 of 143
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Synchrophasor Initiative in India - erldc

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