الفهرس 
ABSTRACT
FACTS ReviewOnly 14 pages are availabe for public view
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Abstract
ABSTRACT
The optimal power flow is a special case of power flow problem with an objective for optimizing the power system operation in terms of economic operating and securitystate. With advent of Flexible AC transmission System FACTS devices, the power system power flow can be controlled and optimized.The present thesis aims atsearching the optimal power operating points and corresponding control parameters of Flexible AC Transmission Systems FACTS devices using advanced search optimization methods. The FACTS devices are employed forenhancing thesteady, dynamic and transient-states operation of power systems.
Anoptimization method called particle swarm optimization approach is utilized to find the optimal location of UPFC in transmission lines based on minimum transmission losses. This method is applied to a 30-bus test system. The effect of the non-linear loads, the UPFC operating cost, the UPFC model and the combined use of UPFC and STATCOM,on the location of UPFC in the system isconsidered.
The effect of optimal power system parameters such as generation power output and bus voltage magnitude and its angle based on system loading maximization and production cost minimization with Flexible AC Transmission System FACTS devices is investigated. Power Flow models are presentedfor simultaneously optimizing location and parameters of different FACTS devices in sense of Production Cost minimization are presented. A Particle Swarm Optimization (PSO) Algorithm is used to solve this nonlinear programming problem. The system loadability levelisdetermined to measure the power system security and the need for connecting FACTS. The performance of the proposed optimization method is evaluated using the IEEE 30-bus power system to examine its global search with a fast convergence rate and find the optimal locations of FACTS devices in large power systems.
UPFC is incorporated in a simple power system in order to simultaneouslycontrol active and reactive power flowsand, bus voltages. Also a supplementary power system stabilizer is designed for damping power system low frequency oscillations due to small external differentdisturbances applied to power systems. Internal UPFC controllers namely Integral-Proportional IPand Proportional Integral PI controllers are designed. The internal UPFC controllers and damping power system stabilizer parameters are tuned using θ-PSO. A comparison between the action of UPFC with IP controllers and the UPFC with PI controllersbased on control specifications and stability is obtained.
Power system dynamic models for simultaneously optimizing location and parameters of UPFC based on the voltage stability index(VSI)minimizationfor transient stability studiesare presented. TheVSIis implemented in the Comprehensive Newton-Raphson load flow method. The merits of theVSI are that it relates both real and reactive power of the system. A Phase Angle Particle Swarm Optimization Algorithm is used to solve this nonlinear programming problem. Different case studiesusing the IEEE 14-bus and IEEE 30-bus systems areinvestigatedto confirm the developed algorithm effectiveness.A procedure for optimal control co-ordination design of PSSs and UPFC devices in a multi-machine power system is developed. The control coordination problem is solved through the application of constrained optimization method .The θ-PSOtechnique is applied to adjust the parameters of the controllers to achieve system stability and optimal damping over wide range of the system operating condition and/or configuration variation. The simulation results of transient stability studiesusing MATLAB R2011bare reported to prove the powerful of UPFCdevice with optimal choice of its location and parameters.