DOI 10.17586/0021-3454-2019-62-6-576-584
UDC 681.5.015.8
PARAMETRIC IDENTIFICATION OF A SERVO DRIVE MODEL WITH DEADTIME-TYPE NONLINEARITIES
Wroclaw University of Science and Technology, Department of Electrical Machines, Drives and Measurements;
S. Y. Lovlin
ITMO University, Saint Petersburg, 197101, Russian Federation; Associate Professor
M. . Tsvetkova
ITMO University; student
A. A. Abdullin
ITMO University, Saint Petersburg, 197101, Russian Federation; Associate Professor
A. G. Mamatov
ITMO University, Saint Petersburg, 197101, Russian Federation; Assistant
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Abstract. An approach to automatic identification of electrical parameters of a servo drive and a PWM inverter, based on least squares method, is proposed. It is noted that existing methods of parametric identification of servo drives use a linear mathematical model of the object and do not consider nonlinearity, due to the "dead time" and the voltage drop on the power switches of the converter. The output voltage of the PWM inverter is significantly distorted due to these features, which deteriorate the identification results. The proposed identification method uses a model that considers the deadtime effect and the voltage drop on the converter power switches. The new method is shown to enable a higher accuracy of parameter estimation than the method with linear servo drive model.
Keywords: identification, servo drive, dead time, PWM - inverter, least squares method
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