Power system parameters in electric facilities with nonlinear loads

The quality of electric power at solid mineral mines in the arctic regions of Russia is analyzed. It is shown that regarding stand-alone power supply systems, an important component of calculation and prediction of electric power quality is determination of an impedance frequency characteristic. The dependences of the harmonic resistance of a power system on the parameters of the nonlinear electric load with a direct current component represented by a capacitance element are obtained; the dependences characterize the resonance phenomena and confirm the need to make allowance for such elements in the estimate of the power system parameters. The increase in the nonlinear load raises the error of estimate of the harmonic resistance in the system relative the conventional presentation of a power system as an inductive impedance. The results of computer-aided modeling of the harmonic resistance in a power network with an incidental harmonic generator at different parameters of the nonlinear electric load, which are proved on a laboratory scale, are described. The incidental harmonic generator can be a thyristor governor used in the mining industry for the gentle start of electric motors and for the active load management. The experimental measurements of a frequency response in a power network at a laboratory and training center with the entrance transformer capacity of 400 kVA are presented.

Skamyin A. N., Dobush V. S., Shklyarskiy Y. E., Vasilkov O. S. Power system parameters in electric facilities with nonlinear loads. MIAB. Mining Inf. Anal. Bull. 2024;(6):88–104. [In Russ]. DOI: 10.25018/0236_1493_2024_6_0_88.

The study was supported by the Russian Science Foundation, Grant No. 21-79-10027, https://rscf.ru/project/21-79-10027.

A.N. Skam'in¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: skamin_an@pers.spmi.ru, ORCID ID: 0000-0001-7738-7539,
V.S. Dobush¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: dobush_vs@pers.spmi.ru, ORCID ID: 0000-0002-9401-5638,
J.E. Shkljarskij¹, Dr. Sci. (Eng.), Professor, e-mail: shklyarskiy_yae@pers.spmi.ru, ORCID ID: 0000-0001-8803-9898,
O.S. Vasilkov¹, Assistant, e-mail: vasilkov_os@pers.spmi.ru,
¹ Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

A.N. Skam'in, e-mail: skamin_an@pers.spmi.ru.

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