Title: Power fluctuation suppression method of medium voltage distribution system based on time-frequency filtering

Authors: Xinying Cheng; Jixue Xing; Fangmiao Zhao; Liu Tong

Addresses: Department of Power Supply Service Command Center (Distribution Network Control Center), State Grid Yingkou Power Supply Company, Yingkou, 115000, China ' Department of Power Supply Service Command Center (Distribution Network Control Center), State Grid Yingkou Power Supply Company, Yingkou, 115000, China ' Department of Power Supply Service Command Center (Distribution Network Control Center), State Grid Yingkou Power Supply Company, Yingkou, 115000, China ' Department of Power Supply Service Command Center (Distribution Network Control Center), State Grid Yingkou Power Supply Company, Yingkou, 115000, China

Abstract: In order to improve the power fluctuation suppression efficiency of a power system, a power fluctuation suppression method of medium voltage distribution system based on time-frequency filtering is proposed in this paper. Firstly, Fourier transform is used to convert the signal between time domain and frequency domain. Secondly, the signal features are discretised by Gaussian kernel function to realise signal filtering. Then, the power fluctuation characteristics of medium voltage distribution system are obtained by two-dimensional Fourier transform of fuzzy function. Finally, the proportional integral is introduced to construct the open-loop transfer function to adjust the system power fluctuation and suppress the power fluctuation of medium voltage distribution system. The experimental results show that this method can improve the efficiency of power fluctuation suppression. The maximum peak to average power ratio of medium voltage distribution system is 9.1%, and the power fluctuation suppression time of distribution system is 22 ms.

Keywords: time frequency filtering; current decoupling; time frequency analysis; ambiguity function; two-dimensional Fourier transform.

DOI: 10.1504/IJPEC.2022.128198

International Journal of Power and Energy Conversion, 2022 Vol.13 No.2, pp.156 - 169

Received: 02 Jun 2022
Accepted: 03 Oct 2022
Published online: 11 Jan 2023 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article