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9
Issue
vol 63 / September, 2020
Article

DOI 10.17586/0021-3454-2020-63-8-711-719

UDC 621.3.07

MEASURING THE DERIVATIVE OF CURRENT USING A DELTA-SIGMA MODULATOR FOR SENSORLESS CONTROL OF A TRACTION ELECTRIC DRIVE

A. S. Anuchin
National Research University “Moscow Power Engineering Institute”, Moscow, 111250, Russian Federation; Head of Chair


E. O. Stolyarov
Moscow Power Engineering Institute, Department of Electric Drives;


G. L. Demidova
ITMO University, Saint Petersburg, 197101, Russian Federation; Associate professor


Y. Vagapov
Wrexham Glyndwr University, Wrexham, 1LL11 2AW, UK; Lecturer


A. A. Zharkov
Moscow Power Engineering Institute, Department of Elec-tric Drives; PhD


D. K. Surnin
Moscow Power Engineering Institute, Department of Electric Drives;


Abstract. A method of direct measurement of the derivative of current necessary to determine the induct-ances in electric motors for reliable and efficient operation of sensorless control in AC electric drives is considered. The method is based on measuring the voltage drop across a calibrated inductance installed directly in the converter power circuit. To improve the method accuracy and reduce the effects of transi-ents and interference, a delta-sigma modulator is used to measure the voltage drop. Experimental re-sults obtained for three different inductive measuring shunts are presented.
Keywords: derivative of current, electric drive, sensorless control, delta-sigma modulator, inductive shunt

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