CUSTOMIZED INTERLINE POWER FLOW CONTROLLER FOR VOLTAGE PROFILE IMPROVEMENT AND POWER LOSS MINIMIZATION OF TRANSMISSION LINE (CASE STUDY: SOUTHERN REGION FROM SHASHEMENE TO BUKULUGUMA TRANSMISSION SYSTEM)

Abstract

An electrical system is a collection of components that are used to supply, transmit, and consume electricity. Transmission lines effectively transfer the electricity produced by different power plants. Nevertheless, the generated electricity is not entirely supplied to customers because of voltage drop and power loss. Uncontrolled bus voltage profile caused problems for industries that were developing quickly. Interline power flow controller (IPFC) is a type of flexible AC transmission system (FACTs) devices applicable to reduce power loss and enhance voltage profiles of the transmission networks from Shashemene to Bukuluguma transmission system. Load flow analysis on nine buses were performed by Newton Raphson load flow analysis technique using MATLAB R2016a. The analysis showed that out of nine buses four buses are out of voltage limit. On the system as a whole, there has been a loss of 8% real power and 10.42% MVAr reactive power, or 7.322MW and 4.530 MVAr, respectively. To minimize the loss problems, grey wolf optimization (GWO) techniques were proposed to search optimal place and size of interline power flow controller (IPFC), placed on bus 5, and sized 27MVAr. GWO techniques are compared with Antlion optimization, but GWO gives a good performance. After analysis data 4 buses bus number 4, 7, 8, and 9 are out of permissible values, the remaining buses are within acceptable limits. GWO techniques suggest implementing the lowest voltage stability index bus. After installing IPFC in optimal power flow place the network problem is improved by GWO 6.1% and ALO 3.9%, the lowest case voltage profile improved from 0.937pu to 0.978pu and 59.7% of active power and 40% of reactive power are saved. Finally, the reduction result suggest that the recommended approach is operative to regulate all buses voltage magnitudes within the NEC and IEEE permissible boundary and to minimize power loss considerably