Optimal Design of KVAr Based SVC for Improvement of Stability in Electrical Power System

Shunt Flexible AC Transmission System (FACTS) devices, when placed at the mid-point of a long transmission line, of Electrical Power System plays an important role in controlling the reactive power flow to the power network and hence both improves the system voltage fluctuations and transient stability. In this paper, a new intelligent design of KVAr based SVC controller has been proposed to control the per unit voltage of transmission line and SVC to keep it within a particular regulation in adverse conditions of loading. The effectiveness of the proposed controllers is demonstrated on a 2-machine system. Results obtained show improvement in the overall system voltage stabilization characteristics using the proposed method. Single Machine Infinite Bus (SMIB) system with SVC located at the terminal of generator has been considered to evaluate the proposed SVC and controllers. The coefficients of an SVC controller have been optimized by a simple analytical technique. Finally the system with proposed controllers is simulated for the special disturbance in the transmission line, and then the dynamic responses have been presented. The simulation results show that the system composed with recommended controller has outstanding operation in fast damping of oscillations of power system for SVCs of modern power systems.

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