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Victor Dos Santos has defended his thesis on Conducted electromagnetic emissions

On 7th March 2019, Victor Dos Santos has defended his thesis. Awarded by INP Toulouse, his work was supervised by Laplace and IRT Saint Exupéry.
The high quality and the relevance of Victor’s thesis contributed to get significant results as a part of Integration project.

Thesis Subject

“Conducted electromagnetic emissions modeling in adjustable speed motor drive systems. Parametric studies and optimization of an inverter and filters under EMC constraints.”

Awards

Victor work Thesis has been considered as outstanding by the jury and has been submitted to 2019 Léopold Escande award. 

About this thesis

Over the last decades, aircraft manufacturers have not ceased to increase the electrical power on board aircrafts. This intensification of the use of electricity, in order to rationalize the secondary energies of the aircraft, lays the foundation for the concept of the More Electric Aircraft (MEA). One of the counterparts to increasing the number of the electrical loads is that they must operate in the same electromagnetic environment, which creates compatibility issues. This discipline has been treated so far at the end of the development of a system, before the stage of certification and aircraft integration. Taking into account these constraints from the design phase, via the estimation of conducted and radiated electromagnetic disturbances by simulation, significant time and costs savings could be achieved by reducing the test phases.

The first step of this research project is the implementation of a modeling approach suitable with optimization processes. It is then essential to take into account all subsystems that form the electromechanical drive, namely the LISNs, the cables, the power converter and the electric motor. The modeling approach chosen is of the direct type ; it consists of representing the electromechanical chain in the common mode base by two ports networks. This generic model allows us to estimate common mode currents directly in the frequency domain at different locations.

Besides, one of the main challenges associated to MEA is thus to drastically increase the power density of electrical power systems, without compromising on reliability. The development of new Wide Bandgap (WBG) semiconductor technologies made of Silicon Carbide, can significantly increase efficiency, performance and power density of adjustable speed electrical power drive systems. Nevertheless, due to their higher switching speed and voltage overshoot, WBG semiconductors used in power converters of an electromechanical chain may have some drawbacks when it comes to Electro-Magnetic Interference. Understanding the switching behavior of WBG components is necessary in order to keep switching speed and overvoltage at a reasonable level. In this PhD thesis, we ensure that the introduction of this emerging technology does not lead to a regression of performance at system level.

Once we establish the conducted emissions models, different filtering solutions have been used: external and internal passive filters. An optimization dedicated to the resolution of a multi-objectives problem (mass, losses) and multi-constraints (quality, stability, EMC, thermal, etc.) in order to minimize the mass of the converter is accomplished. Sensitivity studies led to the identification of the design variables which have the biggest impacts on conducted emissions. This tool allows the optimal sizing of the inverter’s components (power module, heat sink, common mode and differential mode filters, close control parameters). The results obtained thanks to the use of a genetic algorithm make it possible to develop trend curves for an inverter sizing.

INTEGRATION PROJECT

Optimization of the electromechanical chain by increasing electrical system power density, and reducing the weight of all components by working on 3-D power module integration, converter architecture, and motor iron losses.

Jury

Jean-Luc SCHANEN Rapporter Professor at G2ELab, Grenoble INP
Eric LABOURE Rapporter Professor at GEEPS, University Paris Sud
Françoise PALADIAN Examiner Professor at Institut Pascal
Christian VOLLAIRE Examiner Professor at Ampère, Central School Lyon
Bruno SARENI Thesis director Professor at LAPLACE, Toulouse INP
Nicolas ROUX Co-thesis director Lecturer at LAPLACE, Toulouse INP
Bertrand REVOL Examiner Lecturer (HDR), SATIE, ENS Paris Saclay
Jean-Pierre CARAYON Invited Engineer at IRT Saint Exupéry (Liebherr Aerospace secondment)

Related Publications

Victor Dos Santos, Bernardo Cougo, Bruno Sareni, Nicolas Roux, Bertrand Revol and Jean-Pierre Carayon“Trade-off between Losses and EMI Issues in Three-Phase SiC Inverters for Aircraft Applications.”
EMC 2017 (Electromagnetic Compatibility, Signal and Power Integrity), Washington, USA (2017)

Victor Dos Santos, Nicolas Roux, Bertrand Revol, Bruno Sareni, Bernardo Cougo and Jean-Pierre Carayon“Unshielded Cable modeling for Conducted Emissions Issues in Electrical Power Drive Systems.”
EMC Europe 2017, Angers, France (2017)

Bernardo Cougo, Victor Dos Santos, Alaa Hilal and Duc-Hoan Tran: “Trade-off between Losses and EMI Issues in Three-Phase SiC Inverters for More Electrical Aircrafts.”
MEA 2017 (More Electrical Aircraft), Bordeaux, France (2017)

Bernardo Cougo, Jean-Pierre Carayon, Victor Dos Santos, Alaa Hilal and Thibaut Billard“Impacts of the use of SIC semiconductors in actuations systems.”
R3ASC’16 (Recent Advances in Aerospace Actuation Systems and Components), Toulouse, France (2016)