This paper presents a Genetic Algorithm (GA)-
based method to determine the location and size of DG sources in
distribution systems using single DG placement algorithm for
determining the locations at first. Then, the GA is utilized to determine
the global sizes of DG sources which minimize single- or
multi-objective function related to these systems. The influence of
active- and reactive-power injection on the sizing and placement
of DG sources is investigated. The predictions of the proposed
method as regards the sizing and placement of DG sources are
compared with those obtained before using particle swarm optimization
at steady weather conditions.