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Publication

Multirate Modeling and Simulation of Pulse-width Modulated Power Converters

Book - Dissertation

Power converters are used in applications where an adaptation of the frequency or the voltage or current level is necessary. Examples are power adapters for electronic equipment and frequency converters for electric drives. Both in industry as well as in domestic applications, numerous power converting units are applied. As energy efficiency and electromagnetic compatibility become increasingly relevant, the simulation of these devices gains importance because of its ability to study and predict power losses and electromagnetic field radiation in early stages of the design. The converters investigated in this work use power transistors to periodically switch on and off the input power and by this control the root-mean-squared (rms) output power. The switching leads to a ripple component in the output voltage, which brings about a computationally expensive conventional transient simulation as a very fine resolution is needed to resolve the ripples properly. The objective of this research is to achieve an efficient and accurate simulation of power converters and the devices they supply by using a recent concept called Multirate Partial Differential Equation (MPDE). The MPDE approach splits the problem solution according to its inherent time scales and treats them using different solution procedures. A-priori known properties of the solution, e.g. periodicities, can also be exploited. Linear and nonlinear models, combinations of different model fidelities and multi-phase power converters will be investigated.
Publication year:2019
Accessibility:Closed