Synchrophasor Initiative in India - erldc

SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012Table 13: Frequency oscillation modes with HVDC Bhadrawati power order 900 MWSl.NoWestern RegionFrequencyofdifferentmodes ofOscillation1 1.953Magnitude ofOscillation from FFT0.001501Bhadrawati-Sl.NoSouthern RegionFrequencyofdifferent Magnitude of Oscillation from FFTmodes ofOscillationRaipur1 0.097Hyderabad Salem Bengaluru0.097 - 0.0012721.953 - 0.000362 2.9290.00251 0.00241 0.002390.097 0.00131 -3 11.816 0.00062 - 3 0.78120.00067 0.00061 0.00070.7812 0.0002264 10.156 0.00052 0.000192 4 4.10160.00040 0.000281 0.00051.953 - 0.000228 -5 11.816 - 0.000149 5 1.953 0.00040 - 0.000370.7812 0.00032 - 11.816 - 0.000220 -0.7812 0.00032 -12.109 - - 0.00025Spectral analysis using FFT was also done to analyze the low frequency oscillations atBhadrawati. It was observed that there is a significant change in the magnitude of theoscillations when the power flow in HVDC link is 900 MW towards SR.• From PMU data of WR it can be inferred that 1.953 Hz mode of oscillation is presentalong with inter –area oscillation of 0.7812 Hz mode.• From PMU data of SR it can be inferred that possibly exciter mode 2.929 Hz and Intra-Plant mode (1.929 Hz) of oscillations are found to be significant along with Inter-Areamode 0.7812 Hz.• No exciter mode of oscillation is observed on WR side.• Torsoinal mode of oscillation (11.816 Hz) is present on both sides with very lowamplitude.• Magnitude of Intra-Plant mode (1.953Hz) decreases drastically while moving fromBhadrawati end to Raipur end in WR.• The intraplant mode can be named as South-West Mode –I(SWM-I) for future reference.POSOCO Page 119 of 143