On
varying population size and number of iterations for 30-bus system, the results
obtained are shown in Fig 2. It is clear
from Fig 2 that a small population size of 20 and itmax 20 gives optimal solution while there is no variation in
solution quality as number of iterations is increased for population size 20. It
is also evident from Fig 2 that as size of population increases from 30-40 and
onwards, it takes more number of iterations for optimal solution. Similar
pattern is observed for increase in number of iterations for a given population
size as solution is not improving while it increases computational burden Therefore
a small population size is considered as good option for quality solution for
30-bus test system. In this paper, a small population size and less number of
iterations converge to a quality solution because of LIA. In LIA the solution
obtained after given number of iteration from FA is considered as input and is
incremented in small steps and the solution is modified precisely. Therefore
for 30-bus test system, population size of 20 and itmax of 20 is considered for comparison and validity of suggested
algorithm. It is also evident from Fig 2
that loadability lie in a narrow range of 277.79 MW to 280.34 MW for various
population size and number of iterations because of LIA which modifies load on PQ buses one by one till there is scope
of load addition.