ASYNCHRONOUS START-UP STUDY ELECTRIC DRIVE WITH PARAMETRIC CONTROL

UDC 621.376.54: 621.316.722

 

Belyaev Valeri Pavlovich – PhD (Engineering), Associate Professor, Assistant Professor, the Department of Printing Equipment and Information Processing Systems. Belarusian State Technological University (220006, Minsk, Sverdlova st, 13a, Republic of Belarus). Email: beliaev@belstu.by

 

DOI: https://doi.org/10.52065/2520-6729-2024-285-1.

Key words: AC electric drive, parametric control, starting the electric drive.

For citation: Belyaev V. P. Asynchronous start-up study electric drive with parametric control. Proceedings of BSTU, series 4, Print- and Mediatechnologies, 2024, no. 2 (285), pp. 5–12 (In Russian). DOI: 10.52065/2520-6729-2024-285-1.

Abstract

The article presents aspects of the study of the start of an AC electric drive with parametric control. It is assumed that such control is determined by the phase change of the effective AC voltage on the statorwindings of the electric motor. The control is carried out either in the classical way or by PWM control. The main goal is to create a controlled start-up that ensures that the electric drive fulfils the standard values of angular and linear accelerations of the mechanical part of the process equipment to create its long-term operation. It is indicated that from a scientific (theoretical) point of view, the equipment implementing this control should be referred to as a three-phase semiconductor regulator of three-phase alternating current voltage (SRV). At the same time, in the production and commercial environment, it is positioned as a soft starter device, which is not entirely logical. It is shown what values the effective AC voltage acquires in the function of its control angle for classical phase control and on the basis of pulsewidth modulation. These dependencies are unambiguous and curvilinear with a directly proportional change in the values of the control angle. The problem of obtaining a rectilinear increasing acting voltage is raised. A mathematical solution to this problem is given. Simulation of start-up processes with a proportional change in the angle of control of the acting voltage under PWM control, directly proportional to the increase in the effective voltage under PWM control and with the classical phase method is carried out. The results showed that various regularities of changing the values of the operating voltage control angle do not bring significant advantages to the process of starting an electric drive, but add complexity to the implementation of the PRN or soft starter control system. A rational time for the introduction of the bypass function – direct connection of the stator windings of the AD stator to the phases of the supply network – has been revealed. The results of the research are illustrated by the necessary graphs, diagrams, and phase portraits of the launch process.

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20.02.2024