Reactive Power of Asynchronous Electric Drives with Semiconductor Converters

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Yuliia Kovalova
Victor Kovalov
Irina Shcherbak


The purpose of the article is to obtain a ratio for determining the reactive power of induction motors when powered by semiconductor converters. The task is to determine the dependence of reactive power on control parameters of the converters. The research method used is computer simulation of electric drive based on Fryze power theory for non-sinusoidal currents. The result is the obtained expression for the calculation of reactive power, which takes into account the rated idle current of the motor with sinusoidal power supply and the type of converter, due to introducing special coefficients. Numerical values of the latter, depending on the control parameter, are obtained on computer models with their subsequent approximation. The scientific novelty of the research is in the further development of Fryze power theory in the direction of decomposition of non-sinusoidal current components using computer models. The practical significance is the obtained expression for determining the reactive power of an asynchronous electric drive with a thyristor voltage converter, on the basis of which the capacity of compensating capacitors is calculated to increase its energy efficiency.

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How to Cite
Kovalova, Y., Kovalov, V., & Shcherbak, I. (2021). Reactive Power of Asynchronous Electric Drives with Semiconductor Converters. Lighting Engineering & Power Engineering, 60(1), 9–14. Retrieved from
Power Engineering
Author Biographies

Yuliia Kovalova, O. M. Beketov National University of Urban Economy in Kharkiv

Ph.D., Associate Professor, Department of Urban Power Supply Systems and Power Consumption

Victor Kovalov, National Technical University “Kharkiv Polytechnic Institute”

Ph.D., Associate Professor, Department of Automated Electromechanical Systems

Irina Shcherbak, O. M. Beketov National University of Urban Economy in Kharkiv

Ph.D., Assistant, Department of Urban Power Supply Systems and Power Consumption


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