Stability and Power Quality Improvement in Grid Connected System - A Review

Abstract

The modern power system is a complex network which contains of numerous generators, transmission lines, loads and transformers etc. There has been exponential increase in the power demand over the last few decades, transmission lines are loaded more than was planned. With the increased loading of long transmission lines, the problem of transient stability, after a major fault becomes a transmission limiting factor. This leads to FACTs devices being installed in the system. The scarcity of power can be met by using renewable sources like Solar Energy, Wind energy etc. The Solar Energy systems also called PV system can be used in isolated or grid connected mode. PV system has numerous benefits and its use has been increasing in recent years. Beside electricity shortage, a more vulnerable issue in modern power system is related to quality of power delivered. A good quality of power ensures smooth operations of electrical utilities. Harmonic distortion in the grid is produced by non-linear loads connected to grid. This reduces the power quality in the system.