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K.R.VADIVELU Assistant Professor, Department of EEE ,Annamacharya Institute of technology and sciences,Karakambadi, Tirupati,,Andhra Pradesh,India,+919908895631,krvadivelu@rediffmail.com DR.G.VENKATA MARUTHEESWAR, professor, Department of EEE, S.V.U.College of Engineering,Tirupati, Andhra Pradesh,India marutheswargv@gmail.com Abstract This paper presents the relevance of Improved Differential Evolution (IDE) algorithm to solve the Reactive Power Planning (RPP) problem. Minimization of total cost of energy loss and cost of VAR source installments are taken as the objectives incorporating (RPP) problem. This paper compares the success of Evolutionary Programming (EP),Differential Evolution(DE), Improved Adaptive Genetic Algorithm and New Improved Differential Evolution (NIDE) to solve Reactive Power Planning (RPP) problem incorporating FACTS Controllers like Static VAR Compensator (SVC), Thyristor Controlled Series Capacitor (TCSC) and Unified power flow controller (UPFC) considering voltage stability. With help of Fast Voltage Stability Index (FVSI), the critical lines and buses are identified to install the FACTS controllers. The optimal settings of the control variables of the generator voltages, transformer tap settings and provision and parameter settings of the SVC,TCSC,UPFC are considered for reactive power planning. The test and justification of the proposed algorithm are conducted on IEEE 30– bus system and 72-bus Indian system. The Simulation results of the proposed optimization approach is better than Evolutionary Programming and Differential Evolution(DE),Self Adaptive Differential Evolution, shows that the UPFC gives enhanced results than SVC and TCSC and the FACTS controllers diminish the system losses.

Multi Objective Optimization based optimal Reactive Power Planning Using Improved Differential Evolution Incorporating FACTS