The Research Of The Evaluation Method Of Mid-Voltage Distribution Network

Distribution network is an important section which connects the customers and the power supplier. The evaluation of a distribution network provides the reliable basis for the power network planning and construction in the future, which is meaningful for the practice.This article brings forward a scientific, comprehensive, and systemic evaluation index system, considering synthetically the reliability, economic quality, power-supply ability, power quality, and short-circuit current level of the power network, and establishes a integrative evaluation index by means of Analytic hierarchy process(AHP) to evaluate a distribution network systemically. As to all these evaluation indexes, this article applies the power flow analysis technology, the theory and method of distribution network reliability analysis, the cost-profit analysis theory, and the computer technology to compute these indexes by the means of FEA, considering many impact factors, such as comprehensive consideration of the network structure, operation manner, the fault and maintenance impact of devices (transmission line, bus, main transformer, switchers and so on) and the supply load transfer under the condition of fault. Practical use of this system shows its availability which suits the work of evaluation better.On the other hand, we choose some electrical parameter to optimize, such as the setting position and number of the switch, the setting number and capacity of the distribution transformer in the ring network connection, and so on. By computing these optimization results, we can provide some directive opinions for the projects.