Increase in Steady-State Power-Transfer Capacity Using TCSC

Power system engineers are currently facing challenges to increase the power transfer capabilities of existing transmission system. The Flexible AC Transmission Systems (FACTS) technology with relatively low investment, compared to new transmission or generation facilities, allows the industries to better utilize the existing transmission lines. FACTS controllers in the deregulated electricity market allow the system to be used in more flexible way with increase in various stability margins. The FACTS controllers clearly enhance power system performance, improve quality of supply and also provide an optimal utilization of the existing resources. Thyristor Controlled Series Compensator (TCSC) is a key FACTS controller and is widely recognized as an effective and economical means to enhance power transfer capability. In Deregulating power systems, Available transfer capability (ATC) determination and calculation Are important for efficient and competitive utility operation. The thesis aims to present reliable method to meet the requirements by developing a Newton-Raphson based load flow calculation through which control settings of TCSC can be determined for the prespecified power flow between the lines. The proposed method keeps the NRLF algorithm intact and needs little modification in the jacobian matrix. A MATLAB program has been developed to calculate the power flow and losses between the lines. Also the program for ATC Calculation has been developed. To find out the optimal location of TCSC a sensitivity index is calculated. The case studies have been performed on IEEE 6 bus and 39 bus system to show that the proposed method is effective. The test results for IEEE 6 bus and 39 bus system are obtained which shows the losses between the lines, and the Available Transfer Capability of the lines without and with incorporation of TCSC. It can be concluded that after the incorporating of TCSC the losses of the lines reduces. The Available Transfer Capability of the system can be enhanced by implementing the TCSC.