The harmonic effect of different household devices considering the distortion of the network voltage

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Kiss József
Department of Electric Power Engineering

The purpose of my thesis is to gain deeper knowledge in the harmonic relationships of the absorbed current of household devices, especially in the case of ligth sources. I would like to analyze the operation of the simpliest rectifiers, the problems caused by the harmonic components of the voltage, as well as a mathematical model, that can handle the discovered connections. In closing, I would like to present my computer program, that is capable to handle the measured values, and illustrate the results.

The first part of my dissertation contains the theoretical foundations. Here we can learn about the parameters we want to measure later. With this knowledge we will be able to recontruct the network backlash of the measured consumers. I will provide a brief summary how the harmonics spread on the network and explain the emerging problems. Last but not least I will interpret the standards currently in force.

The next section of my thesis will demonstrate the measured consumers. I will classify the light sources based on their principles of operation, covering the usually created waveforms. I would like to analize the structure of some simpler rectifier circuits, as well as the harmonic components appearing in injected current.

The third part contains the results of the distortion-free power examination and the differencies between them, and the measurements powered by communal network. In the second subsection I describe a mathematical modell, that can be effective in considering the effects of the harmonic voltage in the absorbed current.

In the final part, I would like to present my computer program, that can handle the measured values and make graphs from the results. I will show its functions, and make some more examines about the effectiveness of the mathematical modell.


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