© 2019 JETIR February 2019, Volume 6, Issue 2 www.jetir.org (ISSN-2349-5162) JETIRAB06101 Journal of Emerging Technologies and Innovative Research (JETIR) www.jetir.org 559 Reduction of Losses in Ten Bus Distribution System Using STATCOM K. Balaji Nanda Kumar Reddy 1 , Dr. V. C. Veera Reddy 2 , Dr. V. Chandra Jagan Mohan 3 1 Research Scholar(Part Time), Rayalaseema University, Kurnool, AP, India 2 Professor, Department of Electrical and Engineering, Sri Padmavati Mahila University-Tirupati 3 Professor, Department of EEE, Institute of Aeronautical Engineering, Hyderabad ABSTRACT STATCOM is capable of improving the voltage of weak buses in distribution systems. This paper deals with Design, Modeling and Simulation of Ten Bus System using Matlab Simulink. The Ten Bus Distribution (TBS) Systems with and without STATCOM are modulated, Simulated and the results are presented here. The Simulation Results indicate that the real power loss and reactive power loss are reduced by introducing multiple numbers of STATCOMs. The STATCOMs are introduced at the weak buses and the reduction in losses was observed. 1 Introduction The traditional steady state stability studies and transient stability take into account the active power flow P and power angle δ and generally assume constant receiving and sending end bus voltage. The reactive power flow Q and voltage fall during heavy current flow is neglected. This approach could not explain the several black-outs in USA, Europe, Japan etc. during the last quarter of the twentieth century. The blackouts were due to voltage collapse. During voltage collapses, the bus voltage starts falling and as a result power transfer P through the transmission line starts reducing resulting in ultimate voltage collapse and loss of system stability of entire network. That’s why voltage stability studies have received more attention and have acquired a vital place in power system studies. Voltage collapse phenomena take place where reactive power management is inadequate. The application of power electronics in the electric power transmission plays an important role to make the system more reliable, controllable and efficient [1]. Due to deregulation, environmental legislations and cost of construction, it is becoming increasingly difficult to build new transmission lines. Thus it is essential to fully utilize the capacities of the existing transmission system. The Flexible AC Transmission System (FACTS) has become a popular solution to our large/over extended power transmission & distribution system. FACTS devices are proving to be very effective in using the full transmission capacity while increasing power system stability, transmission efficiency and maintained power quality and reliability of power system. These devices are mainly based on either voltage source converter (VSC) or current source converter (CSC) and have fast response time. As an important member of FACTS devices family, STATCOM has been at the centre of attention and the subject of active research for many years. STATCOM is a shunt connected device that is used to provide reactive power compensation to a transmission line. This controller can either absorb or inject reactive power whose capacitive or inductive current can be controlled independent to the AC line voltage. Thus, STATCOM can enhance the transmission line load ability by extending the MW margin and improves the oscillation of voltage transients through efficient