Wide area backup protection method based on fault voltage ratio and multi-information fusion

Abstract

A wide area backup protection method based on a fault voltage ratio and a multi-information fusion provided by the invention comprises the following steps: (1) detecting a fault area of wide area protection; (2) obtaining a fault probability of a line according to the fault voltage ratio; (3) obtaining a fault probability of the line according to the multi-information fusion method; and (4) obtaining a synthetical fault probability of the line through weighting and synthesizing the fault probability in the step (2) and the fault probability in the step (3). According to the invention, the wide area protection is able to have a good motion performance in complex conditions, with a high fault tolerance.

Description

Technical field [0001] The invention relates to a wide-area backup protection method based on fault voltage ratio and multi-information fusion. Background technique [0002] The structure of the power grid is becoming more and more complex. The traditional backup protection based on local measurement information has long delays and difficult adjustments, making it difficult to adapt to flexible changes in the grid structure; and when power flow transfer occurs, it is difficult to distinguish between overload and internal faults in the line, which may easily lead to cascading trip accidents . In recent years, wide-area measurement technology has made certain developments, and wide-area protection has also attracted widespread attention from power researchers. [0003] Nowadays, the main protection of high-voltage power grid generally adopts pilot protection, which is simple to set, has high accuracy of action, fast speed and is not affected by load transfer, while wide-area informa...

AI Technical Summary

Problems solved by technology

[0006] The range of wide-area information collection is large, and it is difficult to achieve the precise anti-interference measures of traditional protection devices. Due to device or channel failures in transmission information, protection information may be missing or incorrect. Therefore, wide-area protection has a certain impact on fault tolerance. higher requirements

Moreover, the wide-area backup protection cannot have good operating performance under complex working conditions such as high-impedance grounding, fault switching, and non-full-phase operation.

The existing technology only studies the fault tolerance of wide-area protection or the action performance of protection under complex working conditions, and does not consider improving the fault tolerance of protection while improving the action performance of protection under complex working conditions; or improving protection in complex working conditions. Study the fault tolerance of protection when operating performance under working conditions

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