Modelling and Comparison of Different HVDC Converter Technologies

Background

With the rise in sustainable energy sources and decommissioning of conventional power plants for a low-carbon future, large-scale power systems are faced with many hurdles. High-Voltage Direct Current (HVDC) is a method of potentially easing these expected issues as this is an efficient way for bulk power transmission over long distances hence ideal for interconnections and offshore renewable integration.

The power electronics used in this application are a key component and are responsible for HVDC’s high controllability and available ancillary services. This therefore means future systems with HVDC require advanced modelling approaches which are necessary to analyse their behaviour and provide valuable information to engineers for assessment. Dynamic converter models are however, very complex and although there are many readily available power system analysis software packages, there may be some vital discrepancies between each of them. This therefore calls for a comparison of the dynamic behaviour of each of these technologies in packages such as DIgSILENT PowerFactory, PSS/E and RAMSES1.

Objectives

In this project, you will have to develop an understanding of LCC, VSC and MMC HVDC converter technologies, their dynamic behaviour and basic control. From this a reliable point-to-point test system will be developed in DIgSILENT PowerFactory, PSS/E and RAMSES to assess their behaviour and compared for any discrepancies.

Deliverables

  • Literature review of different dynamic HVDC converter models with basic control.
  • Small point-to-point test system in different power system software packages.
  • Results presenting any differences between the analysis tools.
  • All the code developed should be documented and published on GitHub under an MIT License2.

Student profile

  • Good analytical skills.
  • Good programming skills.
  • Experience with modelling and simulation of power systems.

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