Internship - dc Solid State Transformer for The
il y a 6 jours
SuperGrid Institute brings together 180 employees, of 28 different nationalities who work together within a dynamic environment in the city of Lyon. As an independent research and innovation centre, we are dedicated to developing technologies for the future power transmission system, the “supergrid”, including HVDC & MVDC technologies.
**General context**
It becomes increasingly clear that DC-DC converters could have a key role to play as enabling technology for future DC systems. The main role of the DC-DC converter is to adapt the voltage between two DC systems. However, the DC-DC converter can also provide power flow controllability and fault current blocking/limiting, and can be classified according to power flow directionality, galvanic isolation and modularity. The power flow directionality is the one of the major functional differences between a DC-DC converter in DC systems and a transformer in AC systems. The transformer is inherently bidirectional but the DC-DC converter can be designed to be either unidirectional or bidirectional. This internship will focus on bidirectional DC-DC converters suitable to interface between LVDC and MVDC systems. Isolated DC-DC converters will be considered and focusing on modular bridge topologies [2].
**Objectives / Missions**
Research of a medium voltage high ratio bidirectional DC-DC converter featuring multilevel bridge operating in quasi 2-level modulation:
- State of the art review (dual active bridge [3], flying capacitor [4], quasi 2 level modulation [5]).
- DC-DC converter topology and control - design and modelling.
- Simulations in steady state, transient and under external faults.
- Techno-economic assessment and comparison with 2-level bridge using direct series connection of SiC MOSFET [6].
- [3] R. W. DeDoncker, M. H. Kheraluwala, and D. M. Divan, “Power conversion apparatus for DC/DC conversion using dual active bridges,” US5027264A, 25-Jun-1991._
- [4] T. A. Meynard and H. Foch, “Multi-level conversion: high voltage choppers and voltage-source inverters,” in PESC ’92 Record. 23rd Annual IEEE Power Electronics Specialists Conference, 1992, pp. 397-403 vol.1._
- [5] A. Tcai, T. Wijekoon, and M. Liserre, “Evaluation of Flying Capacitor Quasi 2-level Modulation for MV Applications,” in PCIM Europe digital days 2021; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, 2021, pp. 1-7._
- [6] C. M. de Vienne, P. Lefranc, B. Asllani, P.O. Jeannin, and B. Lefebvre, “Experimental investigation of a 10 kV-70A switch with six SiC-MOSFETs in a series-connection configuration,” presented at the European Conference on Silicon Carbide and Related Materials, 2021.Master or engineering school student in the last year of his/her studies. The student must have a good knowledge in electrical engineering (power electronics and power systems). An experience with the Matlab/Simulink software is appreciated. Good proficiency in English is required.
**_ Duration : 6 months_**
**What we have to offer**
- You will be joining an institute for energy transition, a promising and stimulating field of activity,
- A young, dynamic working environment,
- Diverse, international teams (+25 nationalities),
- Contribution to meal expenses (company restaurant)
- Sports club within the company (on-site yoga, football, running, etc.)
- Use of self-service company bicycles
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