Title: A method for identifying weak current signals in distribution equipment based on vector control

Authors: Yalei Shang

Addresses: School of Electronic Information Engineering, Hebi Polytechnic, Hebi, 458030, Henan, China

Abstract: Power distribution devices are prone to interference from weak current circuits, resulting in low efficiency and large errors in weak current signal recognition. A method of weak current signal recognition for distribution equipment based on vector control is proposed. According to the bathtub curve operation, analyse the serial and parallel network structure of the power distribution device to determine the failure rate. STFT algorithm is used to analyse the temporal positioning ability of weak current signals, and Fourier transform algorithm is introduced to extract different characteristics of weak current signals. Transform the vector coordinates of the power distribution device and segment them. The sampling frequency of the weak current signal of the distribution device is set based on the modulated voltage space vector, and the weak current signal recognition model of the distribution device is constructed. The test results show that the method has good recognition effect.

Keywords: vector control; distribution device; weak current signal; identification method; bathtub shaped curve; STFT algorithm; frequency shift characteristics.

DOI: 10.1504/IJPEC.2023.134880

International Journal of Power and Energy Conversion, 2023 Vol.14 No.2/3, pp.244 - 260

Received: 28 Mar 2023
Accepted: 02 Jul 2023
Published online: 15 Nov 2023 *

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