A method and system for state monitoring of on-load tap-changers based on information fusion

Abstract

The invention discloses an on-load tap-changer state monitoring method and system based on information fusion, belonging to the field of electric power technology, including: obtaining an effective vibration signal of an on-load tap-changer in an operating state to be tested; adopting phase space reconstruction Obtain the phase point distribution trajectory and vectorized phase point distribution coefficient of the effective vibration signal in the phase space; use the vectorized phase point distribution coefficient and multidimensional Gaussian membership function to obtain the membership degree corresponding to the operating state to be measured and each fuzzy set Selecting the operating state corresponding to the maximum degree of membership is the operating state to be tested; the present invention uses the vectorized phase point distribution coefficient under each operating state as the feature information library of each operating state, and establishes that the eigenvalues ​​of multiple channels can be processed simultaneously The three-dimensional Gaussian fuzzy set membership function can effectively identify normal state and multiple fault states. Compared with the existing monitoring method based on single channel, it has high information utilization rate and strong anti-interference ability, especially the recognition rate is greatly improved.

Description

technical field [0001] The invention belongs to the field of electric power technology, and more specifically relates to a method and system for monitoring the state of an on-load tap changer based on information fusion. Background technique [0002] With the rapid development of the power industry, it has become an inevitable trend to carry out condition monitoring and intelligent management of important power equipment. The on-load tap-changer is a key component of the on-load tap changer. It adjusts the number of coil turns to change the transformation ratio of the transformer through the switching action, thereby avoiding large fluctuations in the system voltage level and ensuring safe and reliable operation of the system. The key role of the on-load tap changer makes the on-load tap changer an important power transmission and distribution equipment in the power system to stabilize the load center voltage, adjust the active and reactive power flows, and enhance the flexi...

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Problems solved by technology

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a method and system for monitoring the status of on-load tap-changers based on information fusion, aiming to solve the problem of using a single channel analysis in the existing on-load tap-changer status monitoring methods. The problem of obtaining incomplete switchgear information and poor recognition of the state of the on-load tap-changer

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