Due to the increasing interest on renewable
sources in recent years, the studies on integration of distributed
generation to the power grid have rapidly increased. In order to
minimize line losses of power systems, it is crucially important to
define the size and location of local generation to be placed.
Minimizing the losses in the system would bring two types of
saving, in real life, one is capacity saving and the other one is
energy saving. In this paper, our aim would be optimal
distributed generation allocation for voltage profile improvement
and loss reduction in distribution network. Harmony Search
algorithm (HSA) was used as the solving tool; the problem is
defined and objective function is introduced according to losses,
security and cost indices. The applied load flow method is based
on the equivalent current injection that uses the bus-injection to
branch-current (BIBC) and branch-current to bus-voltage
(BCBV) matrices which were developed based on the topological
structure of the distribution systems.
This method is executed on 13 bus unbalanced distribution system
and show robustness of this method in optimal and fast placement
of DG, efficiency for improvement of voltage profile, reduction of
power losses and cost.