Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012Table 18: Offline application of PMU dataTimeframeApplicationDescriptionCaseStudyNo.Detection of- Grid events within / other region- Type of fault viz. LG, LL, LLG, LLL, LLLGForensicanalysis offaults/gridincidents- Nature of fault (Dead short circuit or high resistance)- Time of the fault and sequence of events- Fault clearance time, probable location of fault- Summary of element on fault or otherwiseCaseStudy-6 to 19- Voltage recovery post fault clearance- Possible protection operation / misoperation- 1-phase auto reclosing in EHV transmission lineValidation of- Steady state network modelOff-linePost-dispatchanalysis ofgridoperation- Transfer Capability declaration- Simulated short circuit current- Substation disturbance record- Substation event log- Performance / utility of System Protection Scheme- Measurement cycle used in df/dt relayCaseStudy-20 to 29Computation ofCase- System inertia constant (H) using df/dtStudy-- Frequency Response Characteristics (in MW/Hz)38 to 39Detectionand analysisof oscillationsin the powersystemDetection of- Time, duration, amplitude, frequency of oscillations- Type of oscillation viz. inter area or local- Nature of oscillations viz. damped or un-damped- Modes present, their amplitude and damping factor- Coherent group of generatorsCaseStudy-30 to 37POSOCO Page 130 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20126.5 Desirable offline applications in India• Daily event trigger reporting, atypical state measurement reporting• Protection mis-operation analysis• Power System Stability Assessment• Power quality analyzer• Dynamic model validation• PSS tuning• 3D contour plot of phase angle on all-India map showing crests, troughs and nullpointPOSOCO Page 131 of 143
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Synchrophasor Initiative in India - erldc

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