Planning of power system operation for reduction of system loss using series power flow controller devices involving PSO optimization technique

Abstract

This work presents a planning of power system operation for reducing total real power loss (TRPL) using series power flow controller (SPFC) in the in selected transmission lines of a power system.  To identify the transmission lines suitable for placements of SPFC devices, sensitivity relations among the power through lines and TRPL are used. For this purpose, power loss sensitivity factor (PLSF) is derived to relate the change in TRPL to the change in power flow (CPF) through the lines of a power system. Then the lines having significant values of PLSF are considered for the introduction of SPFC devices to reduce TRPL. Utilizing the PLSF and their relation to the change in TRPL, the necessary optimal values of CPF for the selected lines are obtained by using Particle Swarm Optimization (PSO) technique. Incorporating the optimal values of CPF for the lines considered for introduction of SPFC devices, a load flow analysis with SPFC (LFAWSPFC) is carried out, to estimate the state variables of SPFC devices, namely voltage magnitude and phase angle. To show the effectiveness of the proposed method, simulations were performed on standard IEEE 118 bus and it is found that the TRPL has been reduced to 2.5151 p.u. from 3.0851 p.u., also improve bus voltages of the system with the implementation of SPFC devices in the selected sensitive lines. Further, the cost analysis related to installation of SPFC devices and saving due to reduction of TRPL is also presented.