Power system stability : Mode identification in the power system oscillations using wide area measurement systems

In the past few decades power system oscillation damping remains as one of the major concerns for secure and reliable operation of power systems. In response to a continual increase in demand, power systems are driven closer to their limits, especially those of transmission capacity. As such, enhancing the transfer capability, while keeping the system stable, is one of the main goals for system operators. When we transfer a bulk amount of power over a long distance through relatively weak tie lines and high gain exciters then problem of small signal oscillation occurs. These oscillations have also resulted into instability and blackouts in the power system. In this instability problem there are different frequency components which are known as modes. This paper work consist of identification of low frequency components i.e. local area and inter area modes of oscillations in two area power system and also in IEEE 39 bus system.