An Analytical Approach for Optimal DG Placement in Distribution Network Contaminated With Harmonics

This paper has proposed an analytical approach to determine the optimal size and location of a distributed generation unit in a distribution network to minimize the power loss in the network. The suggested method is applicable irrespective of whether harmonic sources are present in the network or not. The analytical methods available in the existing literature are suitable only when no harmonic source is present. The main strength of the proposed method, however, lies in its capability of finding near optimal solutions with very little computational effort even when harmonic sources are present in the network. The method utilizes the concept of B- coefficient loss formula. The conventional method for determining the B-coefficients are not only computation intensive but it is also not applicable for harmonic polluted network. An indirect method is introduced in this work which determines the B-coefficients with very small amount of computation. The proposed method is tested on IEEE 33- bus radial distribution network with the load data suitably modified to incorporate different degrees of nonlinearity. The DG has been assumed to be interfaced with the network through 6-pulse inverter. The test results demonstrate the efficacy of the proposed method for distribution network containing harmonic sources.