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International audience; This paper compares a step by step design of a power electronicsconverter with the results obtained using a design by optimization technique, solvingall equations together. “Order one” method is privileged, in order to facilitateseeking a design optimum in a very constrained space of solutions (especially due toElectromagnetic Compatibility). Specific derivable models for each constraint andcomponent design have been used. Difficulties of these derivable formulations areunderlined, as well as the effectiveness of the method in comparison with theconventional step by step approach, especially regarding EMC.

International audience; The paper deals with the frequency modelling of EMC phenomena using equivalent circuit (with frequency perturbation sources for the modelling of the switching cells of the static converters) in the context of the sizing by optimization of EMC filters. The paper focusses on the way to obtained automatically a frequency model, including the exact computation of its jacobian, useful in the context of design by deterministic gradient optimization. It mainly focuses on selectivity (optimization contextualization) in the modelling with its interests compared to a generic modelling (without knowing with variables will be constrained in the optimization process). The approach is applied to the optimization of EMC filter for power electronics aircraft context.

International audience; This paper presents some key interactions amongconverters, which need to be taken into account when designing amodern embedded electrical grid, including a large amount ofPower Electronics based loads. A design by Optimization methodis first used to define the converter parameters. During this step,it is mandatory to account for the interaction between the inputand output EMI filters. The second step consists in designing thecontrol strategy; the paper will show that the results are largelyimproved if all converters are considered simultaneously. Finally,the stability study of the embedded network has to beinvestigated. All these interactions are studied in the example of athree phases AC network, composed of a Voltage Source Inverterand an Active Front End.

International audience

International audience; As aircraft installed electrical power continues to increase, maintaining the advantages of MEA approach highly relies on the ability to design low-weight on-board electrical network and power electronic conversion systems. However, design and integration of the power system still follow the legacy standards, where locally optimized individual components may not result in optimum system. This paper presents an attempt at exploring the advantages and barriers to integrated design where subsystem interactions are accounted for and the power system is optimized as a whole. As an example, the weight of a notional subsystem of the MEA electrical power system – consisting of a dc bus, a rectifier, an ECS, and an EMA – is studied and optimized as a function of the dc bus voltage, while taking into account the power quality, EMI, and stability constraints. Although the example follows a traditional (decoupled) design approach, the individual component modeling and design processes are formalized with similar structures, so that future system-level integrated design by optimization can be evaluated.

International audience