Journal of Siberian Federal University. Engineering & Technologies / Improving the Quality of Electric Power in Power Supply Systems Based on Hybrid Transformers with a Control Algorithm Using the Wavelet Transform

Full text (.pdf)
Issue
Journal of Siberian Federal University. Engineering & Technologies. 2026 19 (6)
Authors
Bulatov, Yuri N.; Kryukov, Andrey V.; Suslov, Konstantin V.; Kizhin, Vadim V.
Contact information
Bulatov, Yuri N.: Bratsk State University (Bratsk, Russian Federation); ; Kryukov, Andrey V. : Irkutsk State Transport University (Irkutsk, Russian Federation); Suslov, Konstantin V.: Irkutsk National Research Technical University (Irkutsk, Russian Federation); National Research University «MEI» (Moscow, Russian Federation); Kizhin, Vadim V.: Bratsk State University (Bratsk, Russian Federation)
Keywords
power supply system; power quality; hybrid distribution transformer; cascade filter with wavelet transform; modeling
Abstract

In modern power supply systems (PSS), nonlinear loads are becoming more prevalent due to the widespread use of power electronics. This trend reduces power quality and requires the use of specialized devices, such as active (AHF) and passive harmonic filters (PHFs). One of the most effective ways to improve power quality indicators (PQI) in PSSs can be achieved using hybrid distribution transformers (HDTs), which perform voltage conversion and actively suppress harmonic distortion directly at the source. A HDT is a device that combines a conventional transformer and an active power converter, capable of regulating voltage and current in the network, enabling flexible compensation for voltage surges and higher harmonics. The objective of the research presented in this article was to develop a control system for AHFs in HDTs, which, unlike existing systems, is based on a cascade filter with a wavelet transform. Using computer modeling in Matlab/Simulink, the effectiveness of the proposed active harmonic compensation system for an industrial power system (PSS) including high-voltage and low-voltage electric motors was analyzed. The scientific novelty of the presented results lies in the application of an original approach to implementing the active harmonic compensation of a hybrid transformer, based on a cascade filter with a wavelet transform. A description of the HDT model with AHF and the proposed control system in d- q coordinates is provided. The obtained results confirmed its effectiveness. Compared to a PSS using standard transformers, the total harmonic distortion (THD) of voltage decreased by an average of 67 %, while the same indicator for current decreased by 8.5 times, and the unbalance factor decreased by 31 %

Pages
704–718
EDN
QVGQMW
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/159353

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