Synthesis of the methods of research of stability of the electric drive “thyristor voltage converter – induction motor

Authors

DOI:

https://doi.org/10.15587/1729-4061.2016.71496

Keywords:

induction motor, thyristor converter, open-loop system, stability, transfer function

Abstract

In the open-loop systems of electric drive (ED) «Thyristor voltage converter − induction motor (TVC−IM) on the working section of mechanical characteristics, in some cases, the oscillations of the output values can be recorded. Such unstable modes are considered to be a negative phenomenon, which may limit the use of ED and is subject to detailed study.

The transfer function of electromagnetic part of an induction motor was determined, which characterizes the transient function of an electromagnetic torque. It is proved that for different motors the character of the changes in the torque varies, the necessity of selecting specific components of electromagnetic torque was substantiated. Based on the received transfer function, the synthesis of computational−analytical method of the study of the stability of the open-loop system of electric drive of TVC−IM was conducted. The analysis of stability was carried out with different induction motors of one series based on a simplified method by simulations and experiments. The assessment of the impact of different factors on the stability was made, namely: the IM parameters, load torques, the values of the angles of switching valves and initial electromagnetic conditions. It is shown that the study of the ratios of time constants of transient function of electromagnetic torque of IM and electromechanical time constants allows forecasting the possibility of the occurrence of oscillations. The analysis of influence of schematic configurations of pulse-phase systems of control of the TVC on the character of unstable modes was carried out.  The results of this work make it possible to qualitatively and quantitatively characterize a mode of oscillations of TVC−IM, while also to determine the area of possible unstable performance, as well as to attempt to eliminate the preconditions to the occurrence of oscillability.

Author Biographies

Andrew Boyko, Odessa national polytechnic university Shevchenko ave., 1, Odessa, Ukraine, 65044

Doctor of Technical Science, Associate Professor, Director

Institute of Electromechanics and Energy

Oleksandr Besarab, Odessa national polytechnic university Shevchenko ave., 1, Odessa, Ukraine, 65044

PhD, Associate Professor, Head of Department

Department of electrosupply and power management 

Vladimir Semeniuk, Odessa national polytechnic university Shevchenko ave., 1, Odessa, Ukraine, 65044

Doctor of Technical Science, Professor

Department of lifting and transport and robotics equipment

Elena Naydenko, Odessa national polytechnic university Shevchenko ave., 1, Odessa, Ukraine, 65044

PhD, Associate Professor

Department of electromechanical systems, computer–controlled

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Published

2016-06-23

How to Cite

Boyko, A., Besarab, O., Semeniuk, V., & Naydenko, E. (2016). Synthesis of the methods of research of stability of the electric drive “thyristor voltage converter – induction motor. Eastern-European Journal of Enterprise Technologies, 3(2(81), 15–25. https://doi.org/10.15587/1729-4061.2016.71496

Issue

Vol. 3 No. 2(81) (2016): Information technology. Industry control systems

Section

Industry control systems

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Copyright (c) 2016 Andrew Boyko, Oleksandr Besarab, Vladimir Semeniuk, Elena Naydenko

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