This paper summarized the basic steps and processes of urban distribution network planning. It used genetic algorithm with strong global optimization ability for medium voltage distribution network substation outlet to make optimization calculation, and then formed radiation type of power supply network. According to the radial network structure, considering the limitation of the outlet of substation standby capacity and reliability constraint conditions, to meet the situation of minimum investment cost, determined the connection mode of distribution network and contact line direction. This paper adopts an actual distribution network planning project of Tianjin as an example, according to the load forecasting results, determine the connection mode of distribution network and contact line direction, the results meet the reliability, economy and other requirements.
