Similarly, an iterative process is carried for 118 bus and 300 bus test systems which results population size of 30 and itmax 30 for 118-bus test system. While for 300-bus test system, it is found that a population size of 30 and itmax 40 gives promising results. With increase in population size beyond 30 and itmax 40 in 300-bus test system does not improve the solution rather computational time increases.