Synchrophasor Initiative in India - erldc
Synchrophasor Initiative in India - erldc
Synchrophasor Initiative in India - erldc
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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.6.3 Case Study-31: Low frequency oscillations <strong>in</strong> NEW grid on 30-Nov-2011Low frequency oscillations were observed <strong>in</strong> NEW grid at 22:09:34 to 22:14:40 on 30th Nov2011. It was learnt that there was an event at Rihand Stage-II power station <strong>in</strong> the morn<strong>in</strong>ghours of 30th Nov 2011 when the Digital Control System (DCS) of both the 500 MW unitscrashed (a software crash). Due to Software crash<strong>in</strong>g of DCS <strong>in</strong> stage-II, Unit-1 and Unit-2tripped at 10:20 hrs.After reload<strong>in</strong>g of software, Rihand Stage-II Unit-1 was synchronized at21:34 hrs. From 2209 hours, hunt<strong>in</strong>g from 30 MW to 250 MW observed for five m<strong>in</strong>utesapparently due to control system problem.Figure 98: Low frequency oscillations <strong>in</strong> Dadri frequencyFigure 98 shows the frequency plot. It can be seen that low frequency oscillations wereobserved at all the eight locations i.e. oscillations were propagated <strong>in</strong> the entire NEW grid.POSOCO Page 102 of 143
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