Дослідження електромагнітних процесів трифазного асинхронного електропривода з тиристорним регулятором напруги

І. М. Голодний, О. Ю. Синявський, О. В. Санченко

Анотація


 

INVESTIGATION OF ELECTROMAGNETIC PROCESSES OF THREE-PHASE ASYNCHRONOUS ELECTRIC DRIVE WITH TYRRISTOR VOLTAGE REGULATOR

 

I. Golodnyi, A.Yu. Sinyavsky, A. Sanchenko

 

Introduction. For the regulated electric induction often used semiconductor voltage converters, in particular thyristor regulators, which in the technical literature little attention is paid to research performance. This is due to the complexity or high cost of such research. With the development of computer simulation appeared opportunity to deepen the study of various electric characteristics and compare the results with actual data real electric ventilation installation with the station management "Klimatyka 1".

Analysis of recent researches and publications. For low-power asynchronous motors with short-closed rotor relatively easy to adjust the speed of change in voltage on the stator, as they are soft on mechanical characteristics of working. The most simple and cheap for the specified regulation is amplitude voltage regulators with fan electric load.

Purpose – to reduce the time and costs of studies regulated asynchronous electric Assisted by computer simulation and verification of the adequacy of the results obtained in computer models of the real results of controlled electric ventilation installation.

The materials and methods of research. The analysis of electromagnetic processes regulated electric drive with thyristor voltage regulator was conducted using the theory of the electric and statistical methods of processing the results of research on the physical and computer models in the system MatLab.

The results of the research. For the study of electromagnetic processes regulated three-phase asynchronous electric developed his model, which consists of an induction motor AIRP80 A6U2 with high-resistance rotor winding, which causes increased slip at nominal moment, high starting torque and low starting current multiplicity. This engine is currently under load fan speed control allows for a wide range of voltage fed.

Three-phase thyristor voltage regulator consists of three single-phase regulators, each with its own control system. Timing signals sawtooth voltage of each phase through blocks Voltage Measuretment 1, Voltage Measuretment 2 and 3 Voltage Measuretment enter the relevant control systems thyristors. To facilitate the use of model power thyristor units phases A and B and their respective control systems grouped into subsystems Subsystem, Subsystem1, Subsystem2, Subsystem 3.

Block Gain, Product 1, Constant Product 2 and 2 to set up fan motor load (the time changes are not taken into account).

Thyristor opening angle for all phases is set Constant block 1.

The model has a set of virtual instrumentation that allow energy research, adjusting, electromechanical, electromagnetic characteristics. In particular for the study of electromagnetic characteristics used blocks: measuring instantaneous values of current and voltage output thyristor controller – a virtual oscilloscope Scope 1, analysis of the spectral composition of current and voltage performed using 1 Scope block using block Powergui.

To compare the results to a computer model with a digital oscilloscope and digital multimeter Vellman DMK-32 studies were conducted on a laboratory bench regulated electric axial fan VO-7,1M engine AIRP80A6U2. Line voltage on the electric motor changed by using voltage thyristor converter station "Klimatyka-1" pulse-phase control.

Investigation of electromagnetic processes both the model and on the laboratory bench performed at steady state of the electric drive.

As seen in Figure thyristor working, because of the presence of inductance in the load, closes with some delay when current flows through it reaches zero. The shape of the curve is the current failure of the top of the sine wave. This is because in this part off one phase. If we consider the shape of the voltage curve, with the figure shows that the phase Off voltage is zero. Potential voltage formed enabled the other two phases. That creates a bias voltage to the phase windings of the motor.

Simulated current curve has gaps in the current top of the sine wave. The curve of current laboratory stand more distorted, compared with modeled. This is because the model does not account for distortions caused by external pathogens.

The range of output voltage contains all odd harmonics. The range is also odd current harmonics other than the third and multiples of it.

3 High voltage harmonic dominates in the process of reducing the output voltage, it is close to the main and, Um (1) <150 V, even higher than the primary.

By analyzing the spectral composition of the current it can be said that the first higher harmonic 5, it dominates and distorts the most current form. Maximum 5 harmonica takes a value of output voltage at 130 V.

 

Conclusions and perspectives

Research has found that working thyristor, with the presence of inductance in the load, closes with some delay when current flows through it reaches zero. On Off phase voltage is zero. Potential voltage formed enabled the other two phases. That creates a bias voltage to the phase windings of the motor.

The range of output voltage contains all odd harmonics. 3 High voltage harmonic dominates in the process of reducing the output voltage, it is close to the main and, Um(1) <150 V, even higher than the primary.

The shape of the curve is the current failure of the top of the sine wave. This is because in this part off one phase.

The range of current has odd harmonics other than the third and multiples of it. The first higher harmonic 5, it dominates and distorts the most current form. Maximum 5 harmonica takes a value of output voltage at 130 V.


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Посилання


Golodnyi, I. M. ed. (2015). Adjustable Electric [Rehulovanyi elektropryvod] – K.: Ltd. "ZP "Komprynt ". – 509.

Glazenki, T. A., Khrisanov, V. I (1983). The semiconductor system of low power asynchronous electric pulse [Napivprovidnykovi systemy impulsnoho asynkhronnoho elektropryvodv maloiu potuzhnosti]. – L .: Energoatomisdat, Leningrad. dep-tion. – 170.

German-Galkin S. G. (2002). Power Electronics: Laboratory work on the PC: [Sylova elektronika: laboratorni roboty na PK]. – St. Petersburg: CROWN print. – 304.


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