SOS algorithm for DG placement for loss minimization considering reverse power flow in the distribution systems

Distribution systems play a vital role in delivering power to the consumers. But, with the demand for increased power, it is considered as the weakest section in the entire power system as most of the power loss occurs in this section only. The main goal of the utility is to deliver the power of acceptable quality. Placement of Distributed Generators (DG) finds a viable solution for reducing the power loss and voltage profile improvement and hence improved reliability. Non optimal locations and sizes may lead to increased losses and bad voltage profiles. Also the optimal placement of DG should not involve in reverse flow into the slack bus. In this paper a symbiotic relation based algorithm called Symbiotic Organisms Search (SOS) algorithm is used for the optimal placement and sizing of DG's simultaneously. The performance of this proposed method is tested on IEEE 33 and 69 bus test systems and the results are presented and compared with existing methods.