Comprehensive assessment method of power distribution network operation mode, and system

Abstract

The invention provides a comprehensive assessment method of a power distribution network operation mode. The method comprises the following steps: selecting a main index and a plurality of sub indexes from a plurality of preset assessment indicator systems, and building an assessment model comprising an objective function and constraint conditions; performing transformation on the assessment model based on the lagrange function, and calculating lagrange multipliers corresponding to the various sub indexes; and building a result assessment function based on the assessment model after the transformation, introducing the lagrange multipliers corresponding to the various sub indexes as weighted values corresponding to the various sub indexes to the result assessment function, obtaining a plurality of result assessment values, and determining an operation mode, which corresponds to the minimum in the result assessment values, for being the best. The embodiment of the invention is implemented, indexes related to operation of a power distribution network are fully considered, the comprehensive assessment function is built by utilizing the lagrange function in nonlinear programming, subjective factors incorporated in the assessment process are reduced to the maximum extend, an assessment result is more reasonable, and expandability is possessed.

Description

technical field [0001] The invention relates to the technical field of power system distribution networks, in particular to a method and system for comprehensive evaluation of distribution network operation modes. Background technique [0002] According to statistics, the vast majority of user power outages are caused by faults in the distribution network. Therefore, as a link in the power system that is directly connected to users, the distribution network has the most direct impact on the reliability of power supply for users. Conduct a comprehensive evaluation of the power grid operation mode, judge whether the evaluated distribution network meets the relevant requirements of all aspects of the power system, and measure the specific degree of the distribution network to meet the requirements, and then use the technical evaluation results to guide the planning, construction, and maintenance of the distribution network. Retrofit and run. [0003] The key to the comprehensi...

AI Technical Summary

Problems solved by technology

The core idea of ​​Analytic Hierarchy Process is to decompose complex problems by establishing a clear hierarchical structure. This method has strong flexibility, integrity and comprehensiveness, and can effectively deal with the internal relationship and mutual independence between evaluation indicators. However, Its main disadvantage is that when the information is incomplete, pairwise comparisons will lead to inaccurate and inconsistent judgments.

[0007] 3. Complicated calculation and poor resolution

The fuzzy comprehensive evaluation method uses the degree of membership to describe the intermediate degree of the difference, which better solves the problems of the uncertainty of the original data and the ambiguity of the evaluation criteria in the comprehensive evaluation, but the calculation scale of this method is usually large and complex. In some cases, it will appear super blurred, poor resolution, and even cause the evaluation to fail

[0008] 4. The evaluation execution period is long and the evaluation results may not be reliable

The Delphi method makes full use of the experience and knowledge of experts, and finally tends to a consistent result. However, since each evaluation requires multiple rounds of investigations on expert opinions, it consumes more manpower and material resources, and the implementation period is longer. The results lack rigorous scientific analysis, and to a certain extent, there is a tendency to follow the trend

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