Influence of active inductor–capacitor filter on amplitude–frequency characteristic of resonant mode power supply in industry

The modern systems of power supply in the mining industry get equipped with the increasingly more members with the nonlinear voltage–current characteristics. One of such members is a variable frequency drive. Its operation distorts the current–voltage curves, i.e. the power grids of mines experience harmonic distortions. These distortions adversely affect other electric equipment which operates concurrently with nonlinear consumers in the form of reduction of life of the equipment, and degradation of its operational data and energy performance. Higher harmonics have the worst impact on capacitor units for reactive power compensation because of potentiality of resonance in power network. There are known engineering solutions to reduce harmonic voltage distortions in networks down to admissible values, such as compensating filters. However, joint operation of active filters and capacitors in case of resonant modes worsens compensation capacity of the filters. For this reason, the authors of the article examine the influence exerted by an inductor–capacitor filter, set at the outlet of an active filter, on the amplitude–frequency characteristic of an industrial power supply system with a view to eliminating resonance and improving compensation capacity of the filter. The implemented research finds out that parameters of the passive–active inductor–capacitor filter should be tuned out of the initial resonance frequency, but in the range of higher amplitudes of the amplitude–frequency characteristic, and the harmonics adjoining the initial resonance, it is necessary to undertake stepwise adjustment of the inductance and active resistance of the filter, which complicates shifting of the resonance frequency. The operation algorithm of the passive–active inductor–capacitor filter enables smoother adjustment of the reactive power in conformity with the requirement of the load center.

Serikov V. A., Sychev Yu. A., Kostin V. N., Haidar Samet Influence of active inductor–capacitor filter on amplitude–frequency characteristic of resonant mode power supply in industry. MIAB. Mining Inf. Anal. Bull. 2025;(7):170-183. [In Russ]. DOI: 10.25018/ 0236_1493_2025_7_0_170.

V.A. Serikov¹, Cand. Sci. (Eng.), Assistant of Chair, e-mail: Serikov.va@bk.ru, ORCID ID: 0000-0002-2863-000X,
V.N. Kostin, Cand. Sci. (Eng.), Assistant Professor, Leading Specialist, SC «City Center for Expertise», 192102, Saint-Petersburg, Russia, e-mail: kostin_vn@mail.ru,
Yu.A. Sychev¹, Dr. Sci. (Eng.), Assistant Professor, e-mail: ya_sychev@mail.ru, ORCID ID: 0000-0003-0119-505X, 
Haidar Samet, Dr. Sci. (Eng.), Professor, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran, e-mail: hsamet@gmail.com, ORCID ID: 0000-0003-1367-3872,
¹ Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

V.A. Serikov, e-mail: Serikov.va@bk.ru.

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