The document describes a new methodology for optimal placement and sizing of distributed generation (DG) units in distribution networks. It involves:
1) Calculating the Tail End Nodes Voltage Deviation Index (TENVDI) by placing DG at each node to determine the optimal location with the minimum TENVDI.
2) Determining the optimal size of DG placed at the optimal location by varying the DG size and finding the size that results in minimum complex power losses.
3) The methodology is tested on IEEE 33-bus and 69-bus test systems in MATLAB. The results show reductions in losses and improvements in voltage profiles with optimal DG placement and sizing.