Modeling and Performance Analysis of DPFC basedDamping Controller for Power System

Abstract

In the previous two and half decades, the electrical power demand has increased newlinedrastically although the increase of primary and secondary transmission lines and new newlinegenerating power stations are restricted due to various reasons. The modern power systems newlinenow-a-days are enforced to transmit huge amount of the electrical power, by this means newlineoperating in a much troubled situation. Under this situation, the electrical power transmission newlinebetween interconnected areas over tie the lines frequently reacts and results low frequency newlineinter-area oscillations. These oscillations constrain the power carrying capacity of the line and newlineit threatens power system security as well as limits the most effective utilization of the newlinetransmission system. Therefore, this problem has subordinated wide concern and attracted the newlineattention of the researchers. newlineIn the early days, the excitation control of the synchronous machines was the only remedy newlineavailable for controlling these oscillations. Later, power system stabilizers (PSS) were newlineestablished and added to the excitation system loop to improve the power oscillation damping. newlineOn the other hand, the power system stabilizers is generally most effective in damping local newlinemodes of oscillations but in many cases it may not be adequate to provide inter-area newlineoscillations damping. Hence there is a need to develop new and most effective method for newlinedamping inter-area modes of oscillation. newlineCurrently the power electronics based devices usually known as Flexible AC newlinetransmission system devices have been incorporated in modern power system to achieve better newlineperformance of the existing power grid. This technology uses high speed and reliable devices newlineto utilize the existing system capacities and to achieve the controllability better than newlinemechanically operated devices. As per literature survey FACTS devices such as TCSC, SVC, newlineSTATCOM and UPFC are widely preferred to damp out local modes of oscillations as well newlineas inter-area modes.