Power system fault diagnosis method comprehensively using electricity amount and timing sequence information

Abstract

The invention discloses a power system fault diagnosis method comprehensively using electricity amount and timing sequence information. Firstly, power-off areas before and after a fault are compared and analyzed to determine the fault area, and a suspicious element set is formed; secondly, a weighting fuzzy timing sequence Petri net model is built, and SCADA information, electricity amount information of a WAMS and the timing sequence characteristics included in the information are integrated to form the alarm information criterion, place delay restraints and the electricity amount criterion; a Gaussian function is adopted, the confidence coefficient of alarm information is obtained in combination with timing sequence reasoning, the initial confidence coefficient of the Petri net model is calculated through array calculation, and the model is solved; finally, backward reasoning is carried out according to the fault probability of an element, and protection and judgment of maloperation and motion refusal of a disconnector are carried out. The power system fault diagnosis method is high in fault-tolerant capability, can handle the phenomena of protection and maloperation / motion refusal of the disconnector and the phenomenon that an alarm is lost or wrong, and improves the accuracy and reliability of the fault diagnosis result.

Description

technical field [0001] The invention belongs to the technical field of power system safety processing, and relates to a power system fault diagnosis method that comprehensively utilizes electrical quantity and time sequence information. Background technique [0002] Power system fault diagnosis is to use the alarm information generated after the fault to timely and effectively determine the fault component, provide auxiliary decision-making for the dispatcher to quickly identify the fault, and help to remove the fault as soon as possible and restore the normal operation of the power system. Scholars at home and abroad have carried out a lot of research in this field and proposed many fault diagnosis methods. The power system fault diagnosis method based on Petri nets has been widely concerned in recent years because of its strict logic, clear physical meaning, and simple reasoning process, and some achievements have been made. The traditional Petri net consists of places, t...

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Problems solved by technology

[0007] The present invention provides a power system fault diagnosis method that comprehensively utilizes electrical quantities and timing information, and solves the problem that the existing Petri net model-based power system fault diagnosis method does not systematically utilize timing information and the initial confidence of places in the Petri net. Inaccurate problem with experience assignment

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