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

Abstract

The modern power system contains complex circuitry involving transmission lines, generators, loads and transformers etc. As the power demand has increased exponentially over the last few decades, transmission lines are nowadays overloaded. The transmission capacity is limited majorly due to problem of transient stability, which arises due to the increased loading of long transmission lines. A severe fault on this system may cause instability. 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. Non-linear loads in the grid produce harmonic distortion in the grid. This reduces the power quality in the system. Good Power Quality is immensely important for both industrial and domestic sectors. In this paper a review of Power Quality problems and FACTs devices is discussed.