Evaluation method of transformer fault accumulative effect based on distribution network topology model

Abstract

The invention discloses a transformer fault cumulative effect evaluation method based on a topological model of a power distribution network. The transformer fault cumulative effect evaluation method comprises the following steps of: depending on batch processing of a transient simulation program and a short-circuit current calculation program of simulation software PSD-BPA, completing a transformer cumulative effect evaluation function of the power distribution network by setting up a topological model of the power distribution network, calculating electric parameters and operation modes of the topological model of the power distribution network and the practical power distribution network, modifying the operation mode of a main network and a transient steady file, and setting up an end bus short-circuit fault simulation model of the power distribution network and a short-circuit calculation method; and, after the end bus of the power distribution network is failed, calculating short-circuit current flowing through a transformer via a transformer short-circuit fault current cumulative effect calculation model, superposing the short-circuit current with a cumulative effect initial value so as to obtain a transformer short-circuit fault current cumulative effect value, finally, outputting a result to perform graphical display, and performing evaluation. By means of the transformer fault cumulative effect evaluation method disclosed by the invention, condition early-warning and equipment overhaul preference strategies are provided for power distribution network equipment; and thus, the transformer fault cumulative effect evaluation method has good application prospects.

Description

technical field [0001] The invention relates to the technical field of electric power automation, in particular to a transformer fault accumulation effect evaluation method based on a distribution network topology model. Background technique [0002] The evaluation of cumulative effect of transformer equipment failure in distribution network refers to the evaluation of the cumulative effect of the through-circuit short-circuit current flowing on transformer equipment and the impact of overload current on equipment when short-circuit faults or overcurrents occur repeatedly in the distribution network for a long time. The calculation method is to traverse all the fault paths based on recursive operation, and complete the establishment of distribution network topology model and topology conversion; based on the historical fault data of distribution network, a batch calculation model of short-circuit current and overload current is established, Calculate its impact on the assess...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the large number of outgoing lines in the distribution network in the prior art, and its structure is mostly tree-type and ring-type. The topology modeling of the distribution network is very complicated, the amount of calculation data is huge, and the power distribution network is not used. Problems of Rapid Assessment for Assessment of Cumulative Effects of Network Transformer Equipment Faults

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