This is one of two projects about the interaction of protection systems with present and new types of power electronic converters that are used with wind, solar and HVDC infeeds. A range of problems has already been noted for some existing protection methods, regarding the converters' fault current level, phase-current balance, nonlinearity etc. The project will work on identifying future problems and proposing designs of converter control and protection algorithm that work efficiently together. This project is focused more on the converters and their control. Both projects will work closely together and give the students a strong grasp of both of these important subjects. The projects are sponsored by Swedish Energy Agency and Hitachi Energy, and will include collaboration with industry experts. This project will include simulations of different mixes of inverters in the system, with testing of how they can affect projection systems. Then there will be more focus on the grid forming converters and on what details of the control and hardware are most significant for the effect on protection systems. The ability to change inverters as well as protection systems must be investigated, to find a most effective solution.
Third-cycle subject: Electrical engineering
Supervision: Professor Xiongfei WangWhat we offer
To be admitted to postgraduate education (Chapter 7, 39 § Swedish Higher Education Ordinance), the applicant must have basic eligibility in accordance with either of the following:
In addition to the above, there is also a mandatory requirement for English equivalent to English B/6, read more hereSelection
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Target degree: Doctoral degreeInformation regarding admission and employment
Only those admitted to postgraduate education may be employed as a doctoral student. The total length of employment may not be longer than what corresponds to full-time doctoral education in four years ' time. An employed doctoral student can, to a limited extent (maximum 20%), perform certain tasks within their role, e.g. training and administration. A new position as a doctoral student is for a maximum of one year, and then the employment may be renewed for a maximum of two years at a time.Union representatives
Contact information KTH's website.Doctoral section (Students' union on KTH Royal Institute of
Contact information section's website.Application
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