On-load tap-changer state monitoring method and system based on information fusion

Abstract

The invention discloses an on-load tap-changer state monitoring method and system based on information fusion, and belongs to the technical field of electric power, and the method comprises the steps:obtaining an effective vibration signal of an on-load tap-changer in a to-be-detected operation state; obtaining a phase point distribution track and a vectorized phase point distribution coefficientof the effective vibration signal in a phase space by adopting a phase space reconstruction technology; solving the membership degree of the to-be-measured operation state corresponding to each fuzzyset by using the vectorized phase point distribution coefficient and a multi-dimensional Gaussian membership function; and selecting an operation state corresponding to the maximum membership degreeas a to-be-tested operation state; according to the invention, the vectorized phase point distribution coefficient under each operation state is used as a characteristic information base of each operation state; the three-dimensional Gaussian fuzzy set membership function capable of simultaneously processing characteristic values of multiple channels is established, a normal state and multiple fault states can be effectively identified, and compared with an existing monitoring method based on a single channel, the information utilization rate is high, the anti-interference capability is high,and particularly, the identification rate is greatly improved.

Description

technical field [0001] The invention belongs to the field of electric power technology, and more specifically, relates to an on-load tap changer state monitoring method and system 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 turns of the coil 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 flexibilit...

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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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