DYNAMIC STABILITY ENHANCEMENT IN MULTIMACHINE POWER SYSTEMS BY DIFFERENT FACTS DEVICE

Modern Power system are becoming increasingly stressed due to increasing demand of electricity and restriction on new transmission network .This effect of power network is that transmission power loss increases and decreasing power transmission capability of network. And also stability of synchronous alternator is lost. There are electronic based FACTS (Flexible AC Transmission system) devises is established to enhance the power transmitting capacity. A major important function of FACTS devises is to enhanced power transmission capacity of power system network without increasing power generation capacity of power system. Because system voltage is inversely proportional to transmission loses. Hence system voltage increases by connecting different FACTS devises in the system then overall loses of power transmission reduces. Stability enhancement is also important function of FACTS devises. In this paper we analyses the performance of different power system stabilizer at the time of fault occur in the power transmission network, and comprised the performance of different FACTS controller that which one is best for technical point of view.