الفهرس | Only 14 pages are availabe for public view |
Abstract Planning of electrical distribution systems is a process that alms to guarantee an adequate technical performance of the distribution system in return of a reasonable economical cost during a certain period of time. Traditional distribution system planning models were, and still are, devoted to four particular objectives, i.e.: • Optimum substation size and location. • Optimum feeder routing. • Optimum conductor sizing. • Optimum voltage level. Some models can handle the first and second objectives simultaneously, but the third and the fourth objectives are always tackled in separate and different approaches. As a result, there exists no single model that targets all the objectives of the distribution system planning problem comprehensively. This work presents a new model that addresses in a single problem formulation all of the four objectives stated before. The proposed model takes the form of a non-linear programming problem and is based on deriving new formulations for the cost functions and the constraints associated with distribution substations, cables and overhead lines. The solution procedure utilizes the classical optimization method known as the sequential quadratic programming method. Therefore, the result obtained fulfills the requirements of mathematical optimality. The presented model and the solution method are tested on a variety of distribution system planning problems and are found suitable for planning primary distribution networks in vacant areas as well as expanding existing networks. The thesis demonstrates a variety of applications such as: • Expansion of existing UGC distribution systems.• Planning of distribution UGC systems in vacant areas. • Planning of overhead distribution systems in vacant areas. At the end of the thesis, a comparison between the model introduced and the main distribution system planning models is given. The comparison points out the major advantages obtained when the new model is utilized. This thesis is arranged in five chapters, the first of which is a review of the distribution system planning models since the 1960’s. In chapter two, a new model for distribution system planning is introduced. The solution of the new model requires a sufficient knowledge of optimization techniques. Thus, chapter three was written to fulfill this requirement. In chapter four, different applications of the new model in distribution system planning are given. In addition, chapter four includes applications of the conventional models to the same problems solved by the new model for the purpose of comparison. Conclusions and recommendations for future work are given in chapter five. |