High-Temperature Superconducting Cable Fault Location Method Based on Improved Time-Frequency Domain Reflection Method and EEMD Noise Reduction

Abstract

Aiming at the operation and maintenance requirements of the fault location of high-temperature superconducting cables, a fault location method of high-temperature superconducting cables based on the improved time-frequency domain reflection method and EEMD noise reduction is proposed. Considering the cross-term interference problem in the traditional time-frequency domain reflection method, this paper introduces the affine transformation to project the time-frequency distribution of the self-term and the cross term and further highlights the characteristic differences between the two through coordinate transformation, and the particle swarm algorithm is employed to solve the optimal stagger angle of the affine transformation. The unscented particle filter is adopted to separate the cross term, and EEMD noise reduction is introduced to solve the signal noise problem. Finally, two software programs, PSCAD and MATLAB, are employed for joint simulation to build a model of high-temperature superconducting cable. The simulation example shows that the proposed method in this paper can eliminate the cross-term interference of the traditional time-frequency domain reflection method, effectively locate the fault of the high-temperature superconducting cable, and improve the positioning accuracy.

Electro-mechanical braking system spindle unbalance axis trajectory purification and feedback method

“…In general, EEMD can provide an effective noise reduction process for the signal, making the processed signal more characteristic of the original signal than the data obtained by other methods. 13,14…”

“…In general, EEMD can provide an effective noise reduction process for the signal, making the processed signal more characteristic of the original signal than the data obtained by other methods. 13,14 This paper is built on the study of brake disc spindles with electro-mechanical brakes. In order to study the rotor imbalance fault in the brake disc spindle part of this platform while carrying out the rotation process, while using a laser displacement sensor and Cspace controller for signal acquisition work.…”