Research on Comprehensive Quantitative Evaluation Method of the Operation Mode of Urban Distribution Network

In order to make a quantitative comprehensive evaluation of the operation mode of the urban distribution network, this paper proposes a method which uses the economy of Lagrangian function to determine the weights of the evaluation indexes. This method uses Lagrangian function to establish the comprehensive quantitative evaluation model which uses the security, economy and reliability indexes as the constraints, uses different objective functions according to different demand, and is based on a united dimension. This method uses the principle that the Lagrange multipliers of the nonlinear programming represent the influence degree of the corresponding constraints on the objective function, and then uses the Lagrangian function as the result of the evaluation. The result of a numerical example proves that this method can make evaluation of the operation mode of the distribution network, which proves the effectiveness and rationality of the method.