APPLICATION OF GRADE ALGORITHM BASED APPROACH ALONG WITH PV ANALYSIS FOR ENHANCEMENT OF POWER SYSTEM PERFORMANCE

This paper presents an applicaton of GRADE Algorithm based approach along with PV analysis to solve multi objective optimization problem of minimizing real power losses, improving the voltage profile and hence enhancing the performance of power system. GRADE Algorithm is a hybrid technique combining genetic and differential evolution algorithms. Control variables considered are Generator bus voltages, MVAR at capacitor banks, transformer tap settings and reactive power generation at generator buses. The optimal values of the control variables are obtained by solving the multi objective optimization problem using GRADE Algorithm programmed using M coding in MATLAB platform. With the optimal setting for the control variables, Newton Raphson based power flow is performed for two test systems,viz, IEEE 30 bus system and IEEE 57 bus system for three loading conditions. Minimisation of Real power loss and improvement of voltage profile obtained are compared with the results obtained using firefly and particle swarm optimization(PSO) techniques. Improvement of Loadability margin is established through PV curve plotted using continuation power flow with the real power load at the most affected bus as the bifurcation parameter. The simulated output shows improved results when compared to that of firefly and pso techniques, in term of convergence time, reduction of real power loss, improvement of voltage profile and enchancement of loadability margin.