| Author | Viroch Sukonthakarn |
| Call Number | AIT Thesis no. ET-98-32 |
| Subject(s) | Harmonics (Electric waves)
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of
Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | In the present, harmonic distortions from the use of adjustable speed drives have a
significant impact on other system components and equipment operating within a facility
and even at other facilities on the utility distribution system. The increasing use of static
thyristor rectifiers has resulted in some unwanted side effects, one of that is the level of
harmonic voltage distortion imposed on the supply network. The current drawn from the
supply network by a thyristor rectifier is largely non-sinusoidal and contains various
harmonic currents in addition to the fundamental 50/60 Hz component. The harmonic
currents present and their respective amplitudes depend largely on the bridge configuration
and, therefore, the number of de current pulses per supply cycle. Thus the use of thyristor
drives system in an industry involving control of the voltage and speed of induction motor.
The result of these harmonic currents flowing in the supply network is to generate harmonic
voltages across the various supply impedance. This paper is presents with analytical and
experimental investigations on harmonics in the voltage and current waveforms of an
induction motor fed from Adjustable Speed Drive. A computer calculates is used to evaluate
the harmonic spectrum of a given waveform, which is obtained from the mathematical
model of a drive, which controls by PWM inverter in the stator phases of a delta-connected
induction motor. In addition, tests and measurements of torque-speed, voltage, current,
harmonics components, and all electrical power from direct an actual system in laboratory.
And then analysis of resulting experiments by separate as two parts. The first is
measurement data from input of ASp. Second is measurement data from out put of ASD or
input of an induction motors. And results compared to an analysis solution. In final of this
paper, analysis model of Induction Motor circuit by uses a computer calculates of each
harmonic distortion with non-sinusoidal voltage supply. The finally, include the simply
economics of ASD relate to induction motor. |
| Year | 1998 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Surapong C. ; |
| Examination Committee(s) | Malik, A. S. ;Yu, Cunyi; |
| Scholarship Donor(s) | Rajamangala Institute of Technology ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |