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In a deregulated electricity market it may always not be possible to dispatch all of the contracted power transactions due to congestion of transmission corridors. In a competitive electricity market, congestion occurs when transmission network is unable to accommodate all of the desired transactions due to the violation of system operating limits. Congestion relief can be handled using FACTS device such as TCSC, where transmission capability will be improved. Based on reduction of total system reactive power loss optimal location for the placement of these devices. Congestion management by Transmission Line Relief (TLR) sensitivity method was also examined for IEEE 9 bus system. The approach for this problem was carried out with the help of Power World Simulator software.

Increased electric power demand in a deregulated power system causes transmission lines to be driven beyond their transfer limits and causes violation of their limits which results to over load of lines. Available Transfer Capability (ATC) of a transmission system is a measure of unutilized capability of a system at a given time. The computation of ATC is very important to operate the transmission system more secure and the paper focuses on increasing the power transfer capability using FACTS devices like TCSC (Thyristor Controlled Series Capacitor), TCPAR (Thyristor Controlled Phase Angle Regulator), SVC (Static Var Compensator).These FACTS devices are optimally placed on transmission system using Sensitivity approach method. The proposed method is to enhance the ATC on Modified IEEE-14 bus system Using Power World Simulator17 software.

The need for the enhancement of the Transfer Capability in a deregulated power system is very essential in the power market. Available Transfer capability (ATC), and Total Transfer capability (TTC), enhancement ensures to increase the Transfer capability in a power system. Improvement of the TTC and ATC depends upon the placement of the FACTS device; sensitivity approach is used to locate the optimal location to place FACTS device. However enhancement of ATC and TTC with voltage analysis is very essential, this helps us to estimate the security of the system which is very crucial when the performance of the system is the major criteria. Repeated power flow program is used to calculate the voltage constrained ATC and TTC. Transfer capability and voltage analysis proposed in this paper are simulated in the power world simulator software.

In the present day world power system deregulation is at its full stretch. In this deregulated environment there is a clear need for adequate computation of ATC which is currently being given at most importance. The insertion of FACTS devices in electrical systems seems to be a promising strategy to enhance ATC. In this paper, the viability and technical merits of boosting ATC using TCSC are analyzed. The methods used for determining ATC are linear methods, which are based on MVA loading of the system considering system thermal limit constraints, neglecting bus voltages and static collapse. Power Transfer Distribution Factors, commonly referred to as PTDFs, express the percentage of a power transfer that flows on a transmission facility. They are used to determine the maximum ATC that may be available across the system without violating line thermal limits. The effect of reactive power flows in line loading is not considered in linear ATC which is a major limitation. This paper describes a fast algorithm to incorporate this effect. In this paper the line post transfer complex flow is estimated based on exact circle equation and then ATC is evaluated using active power distribution factors. The effectiveness of the proposed method is successfully demonstrated on IEEE 30-Bus system.