Fast harmonic compensation in hybrid HVDC offshore system

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Hybrid HVDC systems have been proposed as an alternative for nominal VSC-Based HVDC for offshore applications. Hybrid HVDC systems consist of an offshore power station composed of the connection of high-power diode rectifiers in series with a fractional power VSC-HVDC. This hybrid configuration allows large power transfer from offshore sites, with the added robustness, simplicity and efficiency of uncontrolled rectifiers. In this research, a robust and fast-acting controller, the Two Degrees of Freedom Internal Model controller (2DF-IMC), is used to control the active power filter features of the fractional-power VSC-HVDC system, resulting in a much faster overall THD reduction in the offshore AC currents in dynamic conditions (i.e. time-varying wind power) when compared with standard active power filter controllers. This improvement is the direct consequence of the fast closed-loop dynamics of the 2DF-IMC controller that do not require filtering stages. Additionally, the increased closed-loop response time did not affect the overall robustness of the control system, thanks to the enhanced disturbance rejection capabilities of the 2DF-IMC configuration.
Original languageEnglish
Article number012040
Number of pages12
JournalJournal of Physics: Conference Series
Issue number1
Early online date21 Jan 2022
Publication statusPublished - 1 Nov 2022
EventEERA DeepWind’2022 - 19th Deep Sea Offshore Wind R&D Conference - Trondheim, Norway
Duration: 19 Jan 202221 Feb 2022


  • fast harmonic compensation
  • hybrid HVDC offshore system
  • two degrees of freedom internal model controller (2DF-IMC)
  • VSC-based HVDC
  • high voltage direct current (HVDC)


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