Effect of optimal allocation of multiple DG and D-STATCOM in radial distribution system for minimising losses and THD

The expansion of power system has led to the increase of Distributed Generation (DG) to fulfil the increase in the load demand. The DG opted has led to the increase in the losses and voltage imbalance due to improper allocation. Rapid increase in nonlinear loads in our daily life has introduced the power quality problems in the power system in terms of harmonics. In this paper, the optimal placement of multiple DG and Distribution Static Compensator (D-STATCOM) in a radial distribution system is carried out which results in the reduction of line losses as well as Total Harmonic Distortion (THD). The optimal location of DG and D-STATCOM is determined by stability index. The optimal size of DG and D-STATCOM is determined using variation technique by increasing the size in steps. The load flow analysis and harmonic flow analysis is carried out on IEEE 34 bus system having the harmonic sources injected as current sources.