D2-01_26 OPERATIONAL EXPERIENCE OF REAL TIME OSCILLATION MONITORING SYSTEM IN INDIA

(IN) SUMMARY Small signal stability problem in power systems has remained a concern for power engineers in India for the past several decades. The power transfers have also become more unpredictable as the consumption and availability of power is linked to weather patterns. This skew in loadgeneration scenario throughout the country has been a major contributing factor for instability phenomena in power systems including oscillations. It is important to detect these poorly damped or growing oscillations in the early stages of the disturbance to initiate appropriate damping controls. The wide spread implementation of Synchrophasors across the power grid made it possible to observe and analyze system-wide dynamic phenomena in real-time. An automatic real-time Oscillation Monitoring System is illustrated for extracting the modal information and mode shape of electromechanical oscillations while they are still emerging in the real power system. The Oscillation Monitoring System includes two separate algorithms called damping monitor Engine and Event Analysis Engine for analysing ambient data and postdisturbance data respectively. This paper summarizes the operationl experience of the first real time Oscillation Monitoring System(OMS) in India at the Power Grid Corporation of India Limited (PGCIL) Southern Regional Load Despatch Centre (SRLDC). A real time oscillation monitoring system has already been implemented in real-time at SRLDC and it is being tested and tuned. The results are illustrated with several actual PMU recordings from SRLDC. Different control strategies are also explored to damp out inter-area oscillations when the Oscillation Monitoring System detects poorly damped oscillations.