Postgraduate research opportunities

Impedance based stability studies of hybrid medium voltage DC/AC networks

The impedance-based stability analysis method is being investigated as a tool to assess the stability of grid-connected converters. This full time 3-year PhD will expand the impedance-based methods to MVDC systems considering the interactions between AC and DC systems.

Number of places

1

Funding

Home fee, Stipend

Opens

13 April 2021

Deadline

31 May 2021

Eligibility

To be considered for the project, candidates must:

·         Possess an undergraduate MEng, first-class BSc/BEng Honours or postgraduate MSc degree in Electrical/Mechanical Engineering, Physics, or similar.

·         Have a demonstrable ability to investigate research problems in an effective manner.

·         Have a strong background on power converters, control, modelling and stability.

 

Tuition fees and stipend are only fully covered for UK/EU students.

Project Details

The impedance-based stability analysis method is being investigated as a tool to assess the stability of grid-connected converters. Among other advantages, the impedance-based stability criteria allow the characterisation of a converter without knowing the control structure or the controller gains performing a frequency scan. This PhD will expand the impedance-based methods to MVDC systems considering the interactions between AC and DC systems.

 

MVDC is a promising technology to connect small to medium size offshore wind farms as well as replacing already existing congested MVAC lines. The thesis will expand the impedance method to cover the stability of hybrid AC/DC systems. In addition, the impedance method needs to linearise the converter system at its operating point. How to extend the application range of linearisation in a variable grid environment needs further research. The impedance analysis method needs to model and analyse the converter in the form of multiple input multiple-output (MIMO) system (due to dq component). Different converter control strategies will be analysed, including grid forming.

 

Working closely with researchers in the PEDEC research group, other InstEE research groups and the technical University Graz University, the successful applicant will have access to state of the art facilities including Strathclyde’s power electronics laboratories, real-time simulators and hardware-in-the-loop experimental platforms. These are further complemented by the extensive expertise across the entire InstEE team https://www.strath.ac.uk/research/subjects/electronicelectricalengineering/instituteforenergyenvironment/, and the MW-scale Power Networks Demonstration Centre (PNDC) https://www.strath.ac.uk/research/powernetworksdemonstrationcentre/ .

 

Funding Details

Funding is available for the successful candidate that will cover an annual tax free stipend and full tuition fees (if UK residents) or part fees (Non UK residents). The stipend starts at £15,285. Non UK residents should contribute around £15,000 per annum.

Supervisor

Dr Agustí Egea-Àlvarez is Strathclyde Chancellor’s Fellow (Lecturer) at the electronic & electrical engineering department and member of the PEDEC group. After some years of industrial experience he joined Strathclyde in 2018. He is a member of IEEE, IET and has been involved in several CIGRE and ENTSO-E working groups.

How to apply

Candidates should email with reference “PhD-SMVDC” a detailed CV with contact information for at least one academic referee, and a covering letter highlighting their suitability for the position, to Dr Agusti Egea-Alvarez (agusti.egea@strath.ac.uk)

The project is available for a start from June to September 2021.

If you wish to discuss any details of the projects informally, please email Dr Egea-Alvarez quoting reference “TUG PhD – PhD SMVDC”.