Electronic voltage transformer state monitoring method based on recursive principal component analysis

Abstract

An electronic voltage transformer state monitoring method based on recursive principal component analysis comprises the following steps: acquiring a secondary output voltage of an electronic voltage transformer, and standardizing the secondary output voltage; solving a covariance matrix of the standardized data; calculating the number of principal elements so as to segment a feature matrix; and establishing an initial offline PCA model of the electronic voltage transformer, and calculating a statistical magnitude and a control threshold thereof. If the offline PCA model judges that the operation state of the electronic voltage transformer is normal within a sampling time k, a recursive principal component analysis method is used in a sampling time period k+1, and the operation state of theelectronic voltage transformer is recognized by monitoring the statistical magnitude so as to judge whether the operation state of the electronic voltage transformer is abnormal or not. When the statistical magnitude exceeds the control threshold, it is considered that the electronic voltage transformer is abnormal; otherwise, it is considered that the operation is normal. The method is used formonitoring the state of the electronic transformer, adapts to the normal operation state, and can monitor the abnormal phase in the operation process in time.

Description

technical field [0001] The invention belongs to the technical field of fault discrimination and state monitoring, and proposes an electronic voltage transformer state monitoring method based on recursive principal component analysis. Background technique [0002] As an important metering device in the power system, the voltage transformer's accuracy and stability are necessary guarantees for the safe and reliable operation of the power system. Especially with the development of digital substations and smart grids, electronic voltage transformers have been widely used due to their advantages such as wide dynamic range, wide measurement frequency bandwidth, and digital output. However, because it is an emerging technology, the failure rate of electronic transformers hanging on the grid for trial operation is significantly higher than that of traditional transformers, which requires appropriate methods to judge the status of electronic transformers. In the field, offline calib...

AI Technical Summary

Problems solved by technology

However, it requires long-term parallel operation of standard transformers. At this time, how to ensure the performance of standard transformers is a problem; and for online monitoring of multiple transformers, multiple standard transformers need to be operated in parallel at the same time, which greatly increases operating costs. , not applicable in engineering

Images