A Calculation Method of Distribution Network Fault Parameter Sensitivity Based on Fault Incidence Matrix

Abstract

The invention provides a method for calculating the fault parameter sensitivity of a power distribution network based on fault incidence matrixes. The method comprises the following steps: in view ofa connecting relationship between a power distribution network branch and a load node, analyzing an influence type of a branch component fault on the load node, and constructing three types of fault correlation matrixes; creating a fault parameter vector, a node load demand vector and a node power user number vector, and performing matrix algebra operation on the three types of fault correlation matrixes and the fault parameter vector, the node load demand vector and the node power user number vector to obtain a reliability index calculation formula of the power distribution network; and figuring out the partial derivation of different fault parameters of the reliability index calculation formula of the power distribution network to obtain the sensitivity of the different fault parameterson the reliability index of the power distribution network. By adoption of the method provided by the invention, the frequent adjustment of the fault parameters and the repeated calculation of the reliability index in a reliability analysis process can be avoided, and the calculation efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of power distribution, and in particular relates to a method for calculating the sensitivity of distribution network fault parameters based on a fault correlation matrix. Background technique [0002] The distribution network directly supplies power to power users, which has a significant impact on the reliability level of power users. With the development of society, the reliability requirements of power users are constantly increasing. Therefore, accurately locating the weak link that affects the reliability of the distribution network, and then taking targeted reliability improvement measures has become an important task for the reliability evaluation of the distribution network. [0003] In order to find the weak link in the reliability of distribution network, the sensitivity of different fault parameters must be analyzed to quantify the influence of different fault parameters of various components in ...

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Problems solved by technology

However, the current research on sensitivity calculation using the direct derivation method is mainly concentrated in the analysis of the reliability index of the large power grid. Since the structure and operation mode of the distribution network and the large power grid are different, the calculation of the reliability index must take into account various protection equipment Therefore, there is no concise and unified analysis and expression method of reliability index at present, which brings certain difficulties to the reliability analysis of distribution network.

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