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Interconnecting two HVDC links using non-isolated DC/DC Converter

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  • Full or part time
    Prof D Jovcic
  • Application Deadline
    Applications accepted all year round
  • Self-Funded PhD Students Only
    Self-Funded PhD Students Only

Project Description

High Voltage Direct Current (HVDC) technology has been recognized as a solution for long-distance bulk-power transmission, asynchronous AC systems interconnections, interconnection of different regions requiring submarine and underground cables, and transmission of offshore wind power to shore.

Interconnecting existing HVDC links and developing DC grids are becoming very attractive when multiple HVDC systems are being installed in close proximity. This enhances the operating flexibility and power security of the interconnected DC system compared with the multiple point-to-point HVDC links and reduces the total power loss and total transmission assets. The market participation and power flow interchange between different TSOs (transmission system operators) also become more flexible.

DC/DC converters are the vital components to interconnect the existing point-to-point HVDC systems with different voltage levels and different control strategies. The converters can be taught as DC-transformers which the voltage stepping up and/or down capability. The can also provide other features such as power flow control and DC fault isolation which are very important in DC grids.

There are two main types of DC/DC converters for HVDC applications; isolated and non-isolated. Each of them has its own advantages and disadvantages compared to the other one. The non-isolated DC/DC converters can be usually developed with lower cost and smaller footstep (very appealing in offshore platforms) but at the cost of no galvanic isolation.

This PhD project includes:
- Literature survey on different types of DC/DC converters and especially on non-isolated DC/DC converters
- Selection of one type of non-isolated DC/DC converter based on some performance indices (such as cost, size, isolation, reliability, complexity and application)
- Selection of two nearby HVDC links to be connected using DC/DC converter
- Designing of an optimal DC/DC converter (Electrical and Control design) based on the two HVDC link data
- Modelling and simulation of the overall system including the two HVDC links and the DC/DC converter
- Developing a small-scale lab model of the converter (optional)

Candidates should have (or expect to achieve) a UK honours degree at 2.1 or above (or equivalent) in Electrical Engineering.

It is essential that the successful applicant has a background in Electrical Engineering with a knowledge of modelling and control.


• Apply for Degree of Doctor of Philosophy in Engineering
• State name of the lead supervisor as the Name of Proposed Supervisor
• State ‘Self-funded’ as Intended Source of Funding
• State the exact project title on the application form

When applying please ensure all required documents are attached:

• All degree certificates and transcripts (Undergraduate AND Postgraduate MSc-officially translated into English where necessary)
• Detailed CV

Informal inquiries can be made to Dr A Jamshidi Far ([Email Address Removed]) with a copy of your curriculum vitae and cover letter. All general enquiries should be directed to the Postgraduate Research School ([Email Address Removed])

Funding Notes

This project is advertised in relation to the research areas of the discipline of Electrical Engineering. The successful applicant will be expected to provide the funding for Tuition fees, living expenses and maintenance. Details of the cost of study can be found by visiting THERE IS NO FUNDING ATTACHED TO THIS PROJECT.

Related Subjects

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FTE Category A staff submitted: 38.60

Research output data provided by the Research Excellence Framework (REF)

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