Analyse und Bewertung leitungsgebundener Emissionen der Elektromagnetischen Verträglichkeit in Umrichtern und Erstellung eines Simulationsmodells zur Verifikation

Document Type
Doctoral Thesis
Issue Date
Issue Year
Gospos, Robert

Aim of this thesis is the development of virtual simulation models of converters to be used during the design process. Therefore, the electromagnetic interference emission (EMI) of three converter generations of one converter topology in the complete drive system is investigated. Structural and functional major interference sources and appropriate actions for interference elimination are defined and described in the thesis and integrated in the simulation models. In the simulation model of the most recent converter generation, the actions for interference elimination are then deliberately designed independent of the hardware. That means, they eliminate interferences to the same amount but in a potentially more cost-efficient way than today’s filters. The result of this simulation model is implemented and verified in real hardware. This thesis is divided into five parts. In the first section fundamentals of conducted EMI emissions are discussed. Here, the sources of electromagnetic interferences and their propagation are introduced. This is based on the theory of signals of periodic and non-periodic signals. They are analyzed in time and frequency domain by Fourier analysis and Fourier integral. In the second part, the valid generic standards and product standards for power electronics and limits, frequency ranges, environments, testing devices and testing methods are described. In the third part, the maximum interference sources in the converter are identified and described. The presentation of alleged interference sources in the converter complete this part. The preparation of the simulation models presents the fourth part of this thesis. Here, the modelling of the individual electrical schematics of the converter is described, which are relevant for the spectrum. All components including their parasitic effects are explained and described. Each interference source is reduced in its propagation through corrective actions. The interference sources are illustrated by a graphical comparison between simulation and measurement of the real hardware. In the final part of this thesis, the insights gained on suitable interference elimination provisions are integrated into the simulation model of the most recent converter generation – independent of the hardware. There is a focus on choosing the provisions so that they cost the same or even less than today’s provisions. The result of the simulation is implemented in the hardware in order to cross-check the results through measurement. In the future, the simulation model may be used for new converter development. This way, the dimensioning of the necessary interference elimination provisions can be done efficiently before or during the design phase. This enables the virtual laying-out of interference elimination provisions instead of verifying them in the real hardware through tests. This saves time, prevents expensive hardware redesigns and might facilitate the reduction of components and therefore make them more cost-efficient.

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