Integrated Distribution Network expansion planning and sizment DG using Intelligent Algorithm

The paper provides a new index in order to determine optimal size and location ofDG units, minimize system power loses and DG cost, optimize voltage profile andincrease voltage stability margin .In this paper, a new indicator (cost index) withthree voltage stability indicators, losses is presented with consideration of loadvariations. In each step, the size and the optimal location of DG are determined.Then an overall expression for DG size is derived as a function of the load levelby the curve fitting method. In this research, we seek to optimize or minimizelosses, maximize the margin of voltage stability, and minimize the total cost, anduse the existing formulas to write the proposed coding method in the mostcommonly written form, and the results obtained using the colonial competitionalgorithm are obtained. In fact, in this research, the cost index, the loss reduction,the voltage profile, and the voltage stability enhancement are considered as themain four-prime target. Using the use of NSGA and also the fuzzy method tonormalize the target functions (Cost function), implementation has been carriedout in the MATLAB software environment, and we have achieved the desired andacceptable results. The proposed method is used for the 34-bus and also 69-bus Test System, and the results obtained are fully and precisely presented in thefourth chapter or the chapter of the simulation results.