Комп'ютерна модель трифазного регульованого асинхронного електропривода із широтно-імпульсним перетворювачем
Abstract
UDK 621.3.067
COMPUTER MODEL OF THREE-PHASE regulated asynchronous electric drive with PWM CONVERTER
I. Golodnyi, A. Sanchenko
In previous works shows that for low-power asynchronous electric adjustable at cost advantage with semiconductor voltage converters. The disadvantage of such devices is that they generate in a power voltage pulses and harmonics. Power quality depends on the way management converters. To confirm this position in MatLab created models of single-phase asynchronous electric adjustable [2] of voltage converters with different control algorithms and a comparative analysis of the spectral composition of the output voltage (load voltage). This paper examined the possibility of building a three-phase electric komp'ternoyi model for regulation of the output voltage on the principle of pulse-width converter [3].
Aim of paper - to improve the quality of the output voltage harmonic composition of semiconductor converters controlled three-phase asynchronous electric drive.
Materials and research methods. Research phase semiconductor voltage converter with pulse width control conducted using the theory of electrical circuits sinusoidal and non-sinusoidal periodic current and computer modeling system MatLab.
Research results. To analyze the output voltage waveform created a computer model of a three-phase voltage converter with pulse width control (Fig. 1).
As a part of the power unit transformer is three-phase power supply Three Phase Source, in which each phase is on active-inductive load RL and AC voltages AC Voltage, three phase diode bridge Universal Bridge. RL and blocks AC Voltage simulated resistance, inductance and EMF stator windings of the motor. In the circle constant voltage diode bridge is on power transistor IGBT, which serves as a key for switching on and off of the power circle.
Fig. 1. Model-phase voltage converter with pulse-width control
Manage transistor unit carried Pulse Generator, which is given switching frequency and time of the on state of the transistor.
The remaining blocks models are auxiliary and are used to determine the instantaneous values of voltage and current to the load.
The results of the three-phase voltage converter shown in Fig. 2. The voltage at block zero AC Voltage asked.
Fig. 2. Oscillograms instantaneous values of voltage (top) and current (bottom) the load
As seen from the waveforms sine wave output voltage of the converter with pulse-width controlled cut with the period consisting of the on time and off state of the power transistor. Thus created a model of a three-phase voltage converter operable and plays the specified parameters output voltage of the motor. In addition, the switching transistor works because of the inductance of the load having reverse voltage pulses in the power circle, you need to consider when choosing the elements of power electronic converter.
Conclusions
The model three-phase elektroprivod regulated on the basis of pulse-pulse transformer voltage models specified shape of the output voltage of the converter.
In the study of this converter is necessary to not only analyze the spectral composition of the output voltage, but also consider the reverse pulse voltage switching transistor key.
References
Голодний І. М. До питання регулювання швидкості малопотужного асинхронного електропривода / І. М. Голодний, О. В. Санченко // Науковий вісник Національного університету біоресурсів і природокористування України. Серія «Техніка та енергетика АПК». – К., 2011. – Вип. 166, ч. 4. – С. 64–70.
Голодний І. М. Порівняльний аналіз на моделі в MatLab гармонічного складу вихідної напруги електронних перетворювачів з різними способами керування при роботі на активне навантаження / І. М. Голодний,О. В. Санченко // Вісник Харківського технічного університету ім. П. Василенка. Технічні науки. Вип. 129 «Проблеми енергозабезпечення та енергозбереження в АПК України». – Х. : ХНТУСГ, 2012. – С. 74–78.
Регульований електропривод. : підруч. для студ. вищ. навч. закладів] / І. М. Голодний, Ю. М. Лавріненко, В. В. Козирський та ін. ; за ред. І. М. Голодного. – К. : Компринт, 2015. – 509 с.
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