Power distribution network fault diagnosis method based on relay protection timing sequence information characteristics

Abstract

The invention discloses a power distribution network fault diagnosis method based on relay protection timing sequence information characteristics. According to the method, a diagnosis decision table is obtained at first by using existing fault information of a power distribution network, and an occurrence area and an occurrence moment of a fault are obtained by comparing a faulty circuit breaker,protection action conditions and diagnosis rules in the decision table. According to the power distribution network fault diagnosis method disclosed by the invention, the relationship between the lines in the complex distribution network is expressed through a preprocessing step, thereby simplifying the representation of condition attributes and decision attributes in the decision table, and solving a combined explosion problem occurring in the complex power grid fault diagnosis by using the traditional decision table; the timing sequence information characteristics represented in three-stagecurrent protection after the fault of the power distribution network are considered, and the diagnosis result of the fault occurrence moment in the fault diagnosis is supplemented; and fault diagnosis can be achieved quickly and effectively, the reliability, safety and flexibility of system operation are greatly improved.

Description

technical field [0001] The invention belongs to the application field of distribution network fault diagnosis, and in particular relates to a distribution network fault diagnosis method based on the characteristics of relay protection sequence information. Background technique [0002] In the process of power system development in my country, the construction of power generation and transmission facilities is relatively large, and the scale and technology are also very complete. Relatively speaking, the investment and improvement of the distribution network system is relatively small. The current situation of unbalanced development of the power system has caused problems of low power supply reliability and power quality, and excessive loads on distribution lines or natural disasters can easily affect normal power supply. At present, the distribution network mainly adopts the most mature SCADA system for monitoring operation and data acquisition. After anomalies or accidents...

AI Technical Summary

Problems solved by technology

Since the protection of the line and the breaking signal of the circuit breaker are generally selected as the condition attributes for fault classification, and the possible fault conditions are used as the decision attributes to establish a decision table, this method will appear when diagnosing complex distribution networks. combinatorial explosion

[0005] Based on the above analysis, the existing distribution network fault diagnosis methods are imperfect or too complicated. The former leads to simple action logic and cannot accurately describe the complex characteristics of the protection configuration and protection of the distribution network. The latter leads to low diagnostic efficiency. , practical difficulty

Simply analyze each line as an object, without considering the relationship between lines in the distribution network, which makes the diagnosis method too complicated

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