Synchrophasor Initiative in India - erldc

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SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012Challenges facedThe journey with synchrophasors has been a roller-coaster ride full of exhilaration andexcitement. The pilot project has revealed several challenges that need to be addressed duringsubsequent initiatives. The areas where major challenges were faced are stated below:• Philosophy for placement of PMUs – strategic vis-a-vis optimal• Validation of the accuracy/quality of synchrophasor data• Adequacy of communication infrastructure• Customization of real-time and offline displays• Intelligent alarms for alerting the operator against grid events in real-time• Real time tools to further enhance the situational awareness in control centre• Innovative tools to tag grid events to the synchrophasor data• Seamless integration of synchrophasor data in SCADA/EMS displays• Data retention/storage policy for Indian conditions (Trigger based or 100%storage)• Data retrieval from the historian• Analytical tools for performing in depth post dispatch analysis• Interaction between utility, academia and application developersSuggestions and scope for future workFew suggestions with regard to scope for future work are listed below:• Ramp up all activities related to synchrophasor initiativeo Integrate regional pilot projects at the national levelo Identify possible solutions to suitably address the challenges facedo Formulate policy for retention and storage of synchrophasor datao Ensure compliance to relevant standardso Deploy Common Information Modelo Establish Quality of Service (QoS) norms for Indian conditionso Develop tailor made displays and customized applications for real-time andoffline to facilitate comprehension of high speed, voluminous datao Determine thresholds and operating limits from historical datao Develop intelligent alarms to alert the operators in real-timePOSOCO Page 10 of 143
SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 2012• Explore application of synchrophasor data ino Adaptive protection and controlo Dynamic model validationo Tuning of Power System Stabilisers (PSS)o Real time dynamic stability analysiso Enhanced state estimationo Transmission planning and generation sitingo Calibration of instrument transformers• Capacity building for improving comprehension/interpretation of synchrophasorso Create a library of grid incidents and events characterized in phasor datao Establish a policy / mechanism for sharing synchrophasor datao Institutional mechanism for collaboration between industry and academiaConclusionThe synchrophasor technology has brought about a paradigm shift from state estimation to statemeasurement. The experience with synchrophasor pilot projects in India has been enriching andhighly rewarding. Though the application of synchrophasor data is still in a nascent stage inIndia, it has facilitated building an understanding of the technology. The gestation and paybackperiod of investment in synchrophasors very small compared to the benefits. It is desirable thatadequate PMUs are installed to capture the information from each and every bay in an EHVsubstation. The possibility of installing PMUs at the LV side of generators and FACTS devicesmay be explored because it might facilitate monitoring the performance of generating units andFACTS controllers under system dynamics. In fact PMUs could become a part of the totalsubstation package.The population of Phasor Measurement Units is likely to grow. Considering the technologicalfuture innovations it would be important to take care of issues related to scalability andinteroperability. Customized applications of synchrophasors in the operation and well asplanning domain need to be quickly developed. Based on the historical information of loadangles, the operational limits in respect of line loadability and angular separation of 30 degreebetween adjacent substations as specified in transmission planning criteria could be reviewed.All-India load angle contour could be used as an input for planning transmission line betweentwo areas or siting a generating station. In the operational time domain, there is a need fordeveloping customized applications to realize the potential of the technology particularly in viewof its utility for large scale integration of renewable energy sources and reliable operation of thelarge synchronous pan India/SAARC grid.POSOCO Page 11 of 143
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