Journal of Research in Science, Technology, Engineering and Management (JoRSTEM) ISSN: 2456-0197 © Malla Reddy Engineering College (Autonomous) 73 A New Method for Optimal Placement of TCSC using ABC Algorithm in Power Systems Mohammad Rafee Shaik 1 , Dr. A. Srinivasula Reddy 2 1 Asst. Professor, Department of Electrical Engineering, College of Engineering Technology, Jijiga University, Jijiga, Somali Regional State, Ethiopia 2 Principal & Professor, CMR Engineering College, Hyderabad, Telangana State, India. Abstract — In power systems because of uncertainty of the load curve and transfer of power between various utilities and loads create block out situations. In these situations the Flexible AC transmission system (FACTS) controllers play an important role in power system security enhancement. As the capital cost of these controllers is high, these controllers must be placed optimally. FACTS devices can regulate the active and reactive power control as well as adaptive to voltage-magnitude control simultaneously because of their flexibility and fast control characteristics. Placement of these devices at optimal location can lead to control in line flow and maintain bus voltages at required level and so improve the voltage profile, to improve load transfer capability, decreasing the losses in the system and operate the system within stable regions. This paper proposes a systematic method for finding optimal location of TCSC to improve voltage profile of a power system with Artificial Bee Colony (ABC) Algorithm. An OPF with/without TCSC using ABC algorithm is considered for healthy conditions in simulation and compared with existing literature. Effectiveness of the proposed method is demonstrated on IEEE 30-bus test system. Keywords — ABC algorithm, FACTS devices, Optimization, TCSC, IEEE 30 bus, Voltage profile I. I N TRO DUC TION In recent years power demand has increased substantially while the expansion of power generation and transmission has been limited due to limited resources and environmental restrictions. As a consequence some transmission lines are heavily loaded and system stability becomes a power transfer limiting factor. Flexible AC transmission system (FACTS) controllers are mainly used for solving various power system steady state control problems. However recent studies reveal that FACTS controllers could be employed to enhance power system stability in addition to their main function of power flow control. It is known that the power flow through an AC transmission line is a function of line impedance, the magnitude and the phase angle between the sending and the receiving end voltages. By proper coordination of FACTS devices in the power system network, both the active and reactive power flow in the lines can be controlled. FACTS devices improves power transmission capacity, voltage profile, enhancing power system stability [5].FACTS devices include static var compensator (SVC), thyristor controlled series compensator (TCSC), unified power flow controller (UPFC) etc. Like other FACTS devices, SVC is an expensive device; therefore it is important to find the optimal location and its size in a power system, so that voltage profile may be improved effectively. In [10], optimal placement of TCSC based on reactive power spot price is discussed.In [14], a method optimal placement of TCSC for static and dynamic voltage security enhancement has been developed. This paper focuses on the placement of TCSC for improving the voltage profile and reducing the real power losses. TCSC is a series FACTS device which is designed to maintain the voltage profile in a power system conditions. In practical power systems, all buses have different sensitivity to the power system stability, some buses are more and some are less. II. TCSC M O DELLING The model of a transmission line with a TCSC connected between the buses i and j. The change in the line flows due to series reactance. The real power injection at buses i and bus j (Pi (com)) and Pj(com)can be expressed as 2 i P( ) [ cos( ) sin( )] i ij i j ij ij ij com V G VV G B    ij Δ Δ δ Δ δ (1)