A Reviw on AGC of Interconnected Power System using Integral Controller

The focus on power quality problems has recently become one of the important issues in power system due to fast industrialization and extensive use of nonlinear loads with varying distortion at ac mains. Poor power factor and voltage drop at the load terminals along with other power quality problems such as harmonics, unbalanced loads have considerable effect on the other connected consumer loads. Harmonics currents produce voltage distortion at PCC (Point of Common Coupling), resonance with source impedance and excessive power losses in supply lines. There are various control algorithms in time and frequency domain for extraction of harmonics components from distorted signals. The facts devices such as STATCOM (Static Compensator) has taken a considerable lead for harmonics suppression, load balancing and reactive power compensation in PFC (Power Factor Correction) as well as ZVR (Zero Voltage Regulation) modes at PCC. The algorithm to find the optimal location of STATCOM based on particle swarm optimization (PSO) has been developed. The effect of this device on line flows and bus voltage profile has been studied by Newton-Rapshon method placing STATCOM at random location and placing them optimally with optimal ratings dictated by PSO. The effectiveness of developed algorithm has been tested on IEEE 14 bus and IEEE 30 bus systems using MATLAB 7.1.0 software. The results obtained are quite encouraging and will be useful in electrical restructuring.