Intelligent electrical-network fault diagnosis method based on multilevel feedback adjustment

Abstract

The invention provides an intelligent electrical-network fault diagnosis method based on multilevel feedback adjustment. The method comprises the steps that historical switching information and electrical quantity attribute information of different devices in an electrical network when the electrical network has faults are stored in a historical fault information base; electrical quantity information of the devices in the electrical network is obtained when the electrical network has faults; diagnosis at the rough identification level is carried out according to the obtained electrical quantity information of the devices in the electrical network, and suspected fault elements are determined in a minimal breaking zone defining method based on the equivalent network to form a candidate set of the suspected fault elements; diagnosis at the fuzzy decision making level is carried out; diagnosis at the accurate positioning level is carried out; and according to results of three levels of fault diagnosis, intersection elements are obtained from suspected fault element sets E1 and E2 to finally determine a diagnosis result of fault elements. The electrical network with faults is analyzed at different levels according to the different sources of the multi-source fault information and the obtaining and processing difficulty of different type of information, and different types of fault information is fully utilized and information is complementary to improve the accuracy of fault diagnosis.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a smart grid fault diagnosis method based on multi-level feedback adjustment. Background technique [0002] In recent years, with the vigorous construction of the smart grid, the scale of the grid has continued to expand and its structure has become increasingly complex, and the requirements for the safety, stability and reliability of the power system and the continuity of power supply have also increased. In the branch of the smart grid, fault diagnosis is the most basic function of the smart grid. If the fault cannot be dealt with in time, it will bring serious losses. A fast and effective grid fault diagnosis method is the strong point of the development of the smart grid. backing. After a fault occurs, the relay protection device configured in the power system will act to send an alarm to the circuit breaker to remove the fault area a...

AI Technical Summary

Problems solved by technology

However, these methods have certain defects. Some methods are limited to a single information source, and some methods are more complex. The most important thing is that they do not have certain versatility in power grids of different sizes.

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