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# Light & Engineering 28 (2)

Volume 28
Date of publication 04/13/2020
Pages 85–88
Dependence of Current Harmonics of Greenhouse Irradiators on Supply Voltage L&E 28 (2) 2020
Articles authors:

Nadezhda P. Kondratievа, Prof., Dr. of Tech. Sc. In 1978, she graduated from Chelyabinsk Institute of Mechanization and Electrification of Agriculture. At present, she is a Head of the Chair of Automated Electric Drive Izhevsk State Agricultural Academy (IzhGSHA). She has its own science school in the field of agricultural lighting and developing of energy saving lighting technologies for agricultural enterprises is her field of interests. Also, she has got the title of “Honorary Worker of Higher Vocational Education of Russian Federation”

Abstract:
The article describes the results of the study concerning the effect of the voltage level on current harmonic composition in greenhouses irradiators. It is found that its change affects the level of current harmonics of all types of the studied greenhouse irradiators. With decrease of nominal supply voltage by 10 %, the total harmonic distortion THDi decreases by 9 % for emitters equipped with high pressure sodium lamps (HPSL), by 10 % for emitters with electrode-less lamps and by 3 % for LED based emitters. With increase of nominal supply voltage by 10 %, THDi increases by 23 % for lighting devices equipped with HPSL, by 10 % for irradiators with electrode-less lamps and by 3 % for LED based emitters. Therefore, changes of supply voltage cause the least effect on the level of current harmonics of LED based emitters and then the emitters with electrode-less lamps. Change of the level of supply voltage causes the greatest effect on the level of current harmonics of HPSL based irradiators. Mathematical models of dependence of THDi on the level of supply voltage for greenhouse emitters equipped with LED, electrode-less lamps and HPSL lamps were formulated. These mathematical models may be used for calculations of total current when selecting transformers and supply cable lines for greenhouse lighting devices, for design of new or reconstruction of existing irradiation systems of greenhouse facilities, and for calculation of power losses in power supply networks of greenhouse facilities during feasibility studies for energy saving and energy efficiency increasing projects.
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