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Simulation and Analysis of a Power Supply Circuit for Frequency Inverter Controlled AC-Induction Motors

Stemmann, Meike (2009) In MSc Theses
Department of Automatic Control
Abstract
For variable-frequency drives, the most common way to apply the desired power to an electrical motor is using PWM modulated signals. Due to high-frequency components, those signals give rise to reflections in the motor cables, radiated noise around the cables and acoustic noise in the motor. In order to avoid those problems, NFO Drives AB develops and produces an alternative to PWM modulation called sinus switch for use with AC induction motors. The sinus switch can produce sinusoidal signals at its output, so that no high-frequency components are transmitted over the motor cables. To extend the range of powers the sinus switch can be used for, to reduce ripple on the output voltage and to reduce the range of switching frequencies used, an... (More)
For variable-frequency drives, the most common way to apply the desired power to an electrical motor is using PWM modulated signals. Due to high-frequency components, those signals give rise to reflections in the motor cables, radiated noise around the cables and acoustic noise in the motor. In order to avoid those problems, NFO Drives AB develops and produces an alternative to PWM modulation called sinus switch for use with AC induction motors. The sinus switch can produce sinusoidal signals at its output, so that no high-frequency components are transmitted over the motor cables. To extend the range of powers the sinus switch can be used for, to reduce ripple on the output voltage and to reduce the range of switching frequencies used, an idea has been developed about how to extend the sinus switch by connecting several modules in parallel. In this thesis, a simulation model of the sinus switch is developed and implemented in Matlab/Simulink. This simulation model is expanded to simulate the sinus switch with parallel modules. A solution to a synchronization problem arising with this extension is being tested and modified successfully. The overall functioning of the extended sinus switch is tested using a DC motor as a load as an example. The simulation shows the expected behavior. Furthermore, the performance concerning parameter inaccuracies and the stability concerning inaccurate solutions to the synchronization problem are analyzed. (Less)
Please use this url to cite or link to this publication:
author
Stemmann, Meike
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
MSc Theses
report number
TFRT-5844
ISSN
0280-5316
language
English
id
8847568
date added to LUP
2016-03-17 09:56:19
date last changed
2016-03-17 09:56:19
@misc{8847568,
  abstract     = {For variable-frequency drives, the most common way to apply the desired power to an electrical motor is using PWM modulated signals. Due to high-frequency components, those signals give rise to reflections in the motor cables, radiated noise around the cables and acoustic noise in the motor. In order to avoid those problems, NFO Drives AB develops and produces an alternative to PWM modulation called sinus switch for use with AC induction motors. The sinus switch can produce sinusoidal signals at its output, so that no high-frequency components are transmitted over the motor cables. To extend the range of powers the sinus switch can be used for, to reduce ripple on the output voltage and to reduce the range of switching frequencies used, an idea has been developed about how to extend the sinus switch by connecting several modules in parallel. In this thesis, a simulation model of the sinus switch is developed and implemented in Matlab/Simulink. This simulation model is expanded to simulate the sinus switch with parallel modules. A solution to a synchronization problem arising with this extension is being tested and modified successfully. The overall functioning of the extended sinus switch is tested using a DC motor as a load as an example. The simulation shows the expected behavior. Furthermore, the performance concerning parameter inaccuracies and the stability concerning inaccurate solutions to the synchronization problem are analyzed.},
  author       = {Stemmann, Meike},
  issn         = {0280-5316},
  language     = {eng},
  note         = {Student Paper},
  series       = {MSc Theses},
  title        = {Simulation and Analysis of a Power Supply Circuit for Frequency Inverter Controlled AC-Induction Motors},
  year         = {2009},
}