Definition of Optimal Structure of Power Network

The purpose of the paper is to form a method for finding the optimal structure of the power network. For the basic criteria of the required method the maximum simplicity, versatility and objectivity are assumed. The properties of existing power grids of various countries and the methods of their analysis and design were analyzed. The research is based on the method of relative comparative assessments. In the paper a set of particular optimization criteria was substantiated, which objectively characterize the power network. These criteria include a complex assessment of the length, an energy assessment, a wires mass assessment and a reliability assessment. A complex length assessment consists of total length assessment of power lines and assessment of total lengths ratio of power lines to conventionally low and high voltages. The overall reliability coefficient of the power supply was proposed to use as a reliability criterion. This factor conventionally represents the level of duplication of power supply in terms of free power and transmission capacity of the power lines. The algorithm for determining the values of partial criteria was considered. The partial optimization criteria were combined using the complex additive criterion. The example of finding the optimal structure of a local distribution power network was given. As variants for the structures of the power network, the schemes of a looped, a trunk passage, a trunk-radial and a trunk with branch were used. In accordance with the method of relative comparative assessments, it was found, that the looped type is optimal.