Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012It is evident from above plots that oscillations are clearly captured when the HVDC power orderis increased to 900MW and oscillations are prominently observed at Bhadrawati end. From theavailable literature on Power System, oscillations observed can be broadly classified as:• Electromagnetic Oscillation (Typically of the order of kHz)• Electromechanical Oscillation (Typically of the order of .2- 46 Hz)The above scenario exposed the following possibilities:• Oscillations generated by the HVDC Link due to inadequate damping by HVDC ControlSystem.• Inter-Area Oscillations.• Intra-Plant Oscillations in Western Region.• Intra-Plant oscillations in Southern Region.PMU plots of second scenario (inter-area oscillations) were further analysed to identify themode of low frequency oscillation.Figure 113: R phase voltage at Bhadrawati showing frequency of oscillationsPOSOCO Page 112 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012Figure 114: R phase voltage at Raipur showing frequency of oscillationsAbove plots indicate presence of low frequency oscillations of 1.923 Hz which falls under thecategory of Intra-Plant Mode of Oscillations.Oscillations reported from NTPC Ramagundam may be reflected in HVDC Bhadrawati West-Bus indicates that these oscillation were not damped out by the existing HVDC controllers(Thyristor firing angle control) and may have their origin in SR. Moreover no other generator inSR has reported oscillations during the corresponding period. This strengthens the possibility ofIntra-Plant mode (1.2 Hz to 2.1 Hz) of Oscillations originating from NTPC Ramagundam.Further based on the analysis of PMU data at WRLDC the following observability status can beestablished.SUGGESTIONS FOR CONTROLLABILITY• As the oscillations seems to be originating on account of intra-plant oscillations atRamagundam, it is suggested to take up tuning of PSS at Ramagundam at the earliest.This is all the more relevant in view of the proposed trial synchronization of NEW Gridwith SR Grid planned in July’12.• Damping controllers which are normally provided at HVDC Bipole stations may beproposed for HVDC B2B Bhadrawati which will help to address inadequate damping.POSOCO Page 113 of 143
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Synchrophasor Initiative in India - erldc

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