Projekt

Analyzing control system parameters of HVDC converters to investigate the severity of fault transients on DC cable systems at 320 kV

Udbyder

Vejleder

Sted

København og omegn

Background Information:

Modular Multilevel (MMC) type Voltage Source Converters (VSC) together with DC cable systems have been the preferred choice of HVDC transmission technology. Ever evolving converter topologies have imposed challenges on the performance of HVDC cable systems. Differences in converter control in case of faults, both AC and DC can affect the travelling wave phenomena in the cable system.

Aim of project:

To investigate different types of faults in 320 kV symmetrical monopolar cable-based MMC type VSC HVDC converter system with a focus on investigating the impacts of converter control systems on voltage and current profiles (peak value and time characteristics) during the faults on a AC and DC side.

Software tool: PSCAD™

Learning Objectives:

-          State of the art HVDC converter control system

-          Developing knowledge on international standards and recommendations, such as IEC, CIGRÉ

-          Developing/adapting PSCAD model of symmetrical monopolar cable-based multi-level VSC used in a typical offshore wind farm point-to-point interconnector with detail models of cable and converter control systems.

-          Assess the impact of converter internal & external AC faults and DC cable faults on the transient stresses on the HVDC cable.

-          Identify control parameters/schemes with a potential to affect overvoltage profiles and carry out systematic study of the parameters effects on such overvoltages.

-          Derive recommendation based on the study

Possible Study Visit

The student will be provided with an opportunity to visit the HVDC cables factory of NKT in Karlskrona, Sweden. This enable the student to receive valuable feedback from the cable experts on the cable system development, testing and manufacturing.

Points and duration of thesis: 30-35 ECTS (5-6 months)

The thesis is a collaboration between DTU ELEKTRO and DTU WIND

Supervisors:

-          (Main) Nenad Mijatovic - DTU ELEKTRO

-          (Main) Nicolaos A. Cutululis- DTU WIND

-          Jayachandra Naidu Sakamuri - DTU WIND

-          Tanumay Karmokar - NKT Sweden


I samarbejde med

NKT cables group A/S

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Kontakt

Virksomhed/organisation

DTU Elektro

Navn

Nenad Mijatovic

Stilling

Lektor

Mail

nm@elektro.dtu.dk

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OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

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Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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