Voltage Level Optimum Option in Power Distribution Network Planning

Selection of the voltage level is the most crucial issue in the power distribution network planning,especially in the mid-long term power distribution network planning.In this paper,the authors firstly establish the functional relationship between voltage level and investment,operation cost.According to the principle of cost minimization,optimization on voltage levels is progressed to illustrate that the "Geometric Mean" principle is a special case among the method mentioned in this paper.Furthermore,based on the function of investment and operation cost established above,optimization on the voltage level sequence is carried out.Finally,with a distribution network case in Shanghai as an example,feasibility of the voltage level based on the above-mentioned optimization is demonstrated,and it is proved that the method is effective and valid.