Electrical Power System Loadability Enhancement With The Implementation Of FACTS Devices

Due to the ever-growing power demand,power transmission is continuously operating near to its limits.But the power systems should be operated within their thermal and voltage limits.Otherwise,the system may confront a complete blackout.To handle this condition,the existing power transmission system cannot be relied on and distinct methods of operating the system are needed.Establishing more new power lines can be a solution but it isn't always affordable or satisfactory.It has economic or environmental constraints.If the transmission system is regulated efficiently then a greater part of produced power could be supplied to load.This increase in power system structure needs the stability,flexibility and robust control over the system parameters to efficiently supply load and meet rapidly increasing demands.The power system has to be flexible to tackle with any sort of sudden expansion or contraction in the generation,transmission,distribution,and consumption in an effective way.This requires flexible operation conditions and flexible AC transmission system(FACTS)devices are offering such a flexible control since the 90s and these devices are well known controlling devices today.They are micro-controller based devices using power electronics in their operation.These microcontroller-based devices are well suited for increasing loadability of transmission lines,reactive power compensation,voltage profile improvement along with other electrical parameters in a power network.In this thesis,the control ability of the FACTS devices SSSC(Static series synchronous compensator),TCSC(Thyristor control series compensator)to improve the power transfer capability(PTC)of the transmission lines is investigated.The midpoint compensation technique using TCSC for reliability improvement is proposed to increase the surge impedance loading and maintain steady voltage profile throughout the system.The detailed investigation on series FACTS device SSSC and TCSC has also been carried out to sustain stability following a fault transient.The results determined that the transient stability of the power network is exceptionally afflicted by SSSC and TCSC.It is also analyzed that the power system stability increases more with TCSC in two machine 3 bus system.Simulations are carried out in MATLAB/Simulink environment.An optimal fuzzy PID controller based on fuzzy logic(FL)and genetic algorithm(GA)for TCSC with dual TCRs is proposed and designed considering system impedance.The simulations results revealed that the speed of response and operational flexibility of optimal fuzzy PID controller are substantially enhancedThe ETAP is used to build a model of 132 KV/11 KV sub network with total 34 number of buses test system located in substation Bahawalpur Punjab Pakistan,the amount of voltage drop in the system has been analyzed.Then,the location and capacity of SVC are determined.The loadability(transmission capacity)of power system is greatly increased and bus voltage is guaranteed to be within the allowable range with the given method.