An IGBT based series power flow controller for multi-terminal HVDC transmission

Senthooran Balasubramaniam, Jun Liang, Carlos E. Ugalde-Loo

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

51 Citations (Scopus)


Increased offshore wind penetration has raised the need of multi-terminal high-voltage direct-current (MTDC) grids. An MTDC system will enable cross-border energy exchange where the excessive energy can be transferred between countries, increasing the functionality and reliability of the network. However, as the number of terminals and branches increases, power flow management becomes a challenge. To improve reliability and efficiency, power flow needs to be rescheduled between terminals. This can be achieved by introducing a power flow controller (PFC). In this paper, an insulated-gate bipolar transistor based series PFC is proposed. A PFC is basically a low power rated controllable voltage source connected in series with a DC line. It enables the regulation of grid power flow via a small series voltage injection. A four-terminal MTDC system is modelled using Simulink/ SimPowerSystems to test the impact of the proposed device. This is analysed under two different control strategies for the voltage source converter-based terminals; namely, master-slave and voltage droop control. Simulation results show that the PFC is capable of enhancing the system performance by suitably redirecting the power flow at the point of connection. Moreover, the results clearly illustrate that the converter control modes effectively affect the power flow in the MTDC grid.

Original languageEnglish
Title of host publicationProceedings of the Universities Power Engineering Conference
PublisherIEEE Computer Society
ISBN (Electronic)9781479965571
Publication statusPublished - 23 Oct 2014
Externally publishedYes
Event49th International Universities Power Engineering Conference, UPEC 2014 - Cluj-Napoca, Romania
Duration: 2 Sept 20145 Sept 2014

Publication series

NameProceedings of the Universities Power Engineering Conference


Conference49th International Universities Power Engineering Conference, UPEC 2014
Abbreviated titleUPEC 2014


  • DC line
  • H-bridge
  • high-voltage direct-current
  • insulated-gate bipolar transistor
  • multi-terminal high-voltage direct-current grid
  • power flow controller
  • voltage source converter

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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