INVESTIGATION OF ELECTROMAGNETIC PROCESSES OF THE ELECTRON KEY SNUBERN UNIT VOLTAGE REGULATOR

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INVESTIGATION OF ELECTROMAGNETIC PROCESSES OF THE ELECTRON KEY SNUBERN UNIT VOLTAGE REGULATOR

Journal Title: Machinery and Energetics - Year 2018, Vol 0, Issue 283

Abstract

Introduction. For a regulated asynchronous electric drive, semiconductor voltage converters, in particular thyristor regulators, are often used, for which technical literature does not pay much attention to the study of performance. This is due to the complexity or high cost of conducting such studies. With the development of computer simulations, it was possible to deepen the research of various characteristics of the electric drive and compare the results with the actual data of the real electric drive of the ventilation unit with the control station "Climate-1". Analysis of recent research and publications. In previous studies it has been shown that for a controlled low-power asynchronous electric drive, the cost of semiconductor voltage transducers is prevalent. The disadvantage of such devices is that they generate voltage pulses and higher harmonics in the supply network. The quality of the electricity depends on the way of controlling the converters. To confirm this position in MatLab, models of single-phase and three-phase controlled asynchronous electric drives with regulation of the output voltage based on the principle of pulse-width converter. The purpose of the research is to improve the harmonic composition of the output voltage of the semiconductor converters of an adjustable three-phase asynchronous electric drive. Materials and methods of research. The research of a three-phase semiconductor voltage converter with pulse-width control was carried out using the positions of the theory of electric circuits of sinusoidal and nonsinusoidal periodic current and computer simulation in the MatLab system. The results of the research. To study the work of the snubber circle of the power transistor key and the choice of its parameters, the model of the three-phase semiconductor converter with pulse-width control is taken as the basis. In the power block of the converter there is a three-phase power supply Three-Phase Source, in each phase of which is active-inductive load RL, three-phase diode bridge Universal Bridge. The RL blocks (R = 48 Ohm, L = 0.0197 H) simulate the active resistance and inductance of the stator winding AИРП80-A6У2 for the axial fan VO-F-5.6A. The IGBT power transistor, which serves as the key for switching on and off the power circuit, is turned on in the DC voltage range of the diode bridge. The operation of the transistor is controlled by a Pulse Generator unit, which specifies the switching frequency and the on-time state of the transistor. Previous studies of electromagnetic processes in a power electronic key without a snubber circle found that the voltage pulse in the power circuit of the converter reaches UIPP = 60 kV. One of the simplest RC-snubbers is used to reduce the value of the pulse voltage. Calculation of the active resistance and the capacity of the snoring unit is calculated approximate. According to the results of the research, it was found that the use of the snubber allowed to reduce the voltage pulse when the electronic transistor switch was switched off from 60 kV to 1.1 kV. Conclusions and perspectives. The results of the research on the computer model of electromagnetic processes in the circle of the power electronic key showed that at the active-inductive load (R = 48 Ohm, L = 0.0197 H), which corresponds to the winding data of the electric motor АИРП80-А6У2, the voltage pulses reach 60 kV. In practice, the calculation of parameters of the elements of the snubber is carried out approximate, whose results can be corrected by computer simulation. The selected snubber parameters (RS = 150 Ohm, CS = 0.3 μF) give the ability to reduce the voltage pulse to 1.1 kV when switching the transistor key. In this case, the composition of higher harmonics is not violated, but their effect in the percentage to the main decreases.

Authors and Affiliations

І. М. Голодний, О. В. САНЧЕНКО

Keywords

EP ID EP388983
DOI -
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