Electrical power quality is becoming intensity concerned from both electric utilities and customers. Voltage fluctuation is a major power quality problem as it has a significant impact on both the equipment and production environment. This work describes the voltage control technique of mitigation of voltage fluctuations and clearing fault using distribution static synchronous compensator (DSTATCOM).The test system used is Egyptian native power distribution system. A simulation was done using MATLAB/Simulink software.

Flexible Alternating Current Transmission Systems (FACTS) devices have been suggested as an efficient solution for regulating bus voltage and controlling in power flow in electrical power networks, which leads to improve stability and reduce the loss of electrical power. Suitable location and the appropriate size of these devices can lead to control line flow and maintain the voltage at each bus at the desired level and so recover system security. This paper shows comparison study between two techniques from artificial intelligent techniques to determine location and optimal size of FACTS devices based on power losses, voltage division and system over load. Also, in this paper a comparison between multi-and single objective function to find the optimal location and optimal size of SVC has been carried out. The proposed algorithms are simulated annealing and particle swarm optimization and are tested on modified IEEE 30-bus power system for optimal allocation of Static VAR Compensator (SVC) as a kind of FACTS devices and results are presented.

Enhancement the performance of electrical power system network became essential for increasing the realiability of power transmission during any disturbance and variations. One of these variations is series compensation in heavily loaded transmission lines which affects directly the Distance Relay (DR) settings. This paper provides control system architecture to cover the setting and coordination of protection scheme based on DIgSILENT power factory program with practical representation of interactive control system by using SIMATIC manger, and WinCC programs. Applied scheme makes protection system more reliable with optimal tripping time.

<em><span>Power Quality is becoming intensity concerned from both electric utilities and customers. Voltage Flicker is a major power quality problem as it has a significant impact on both the equipment and production environment. This work describes the voltage control technique of reduction of voltage flicker and clearing fault using Distribution Static Synchronous Compensator (DSTATCOM). The test system used is IEEE 9-bus distribution system clarified the optimal location of DSTATCOM by using Artificial Neural Network. A simulation was done using MATLAB/Simulink software.</span></em>

Recently improvement of automation systems for electrical power system network became essential for increasing the realiability of power transmission during any disturbance. In a substations the setting of Distance Relays (DRs) are set manually which depends on human experience which may be led to undesirable operation. Any power transmission system may subjected to shortens and loss of adjusting its protection setting, DRs in protection systems are responsible for protected a High voltage transmission lines from short circuit, power swing, and load encroachment, A proposes automation system architecture is introduced to cover the setting and coordination of protection scheme based on DIgSILENT power factory, SIMATIC manger, and WinCC programs.