Fast harmonic compensation in hybrid HVDC offshore system

Tian, Shangen and Campos-Gaona, David and Peña Alzola, Rafael and Anaya-Lara, Olimpo (2022) Fast harmonic compensation in hybrid HVDC offshore system. Journal of Physics: Conference Series, 2362 (1). 012040. ISSN 1742-6588 (

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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.


Tian, Shangen ORCID logoORCID:, Campos-Gaona, David ORCID logoORCID:, Peña Alzola, Rafael and Anaya-Lara, Olimpo ORCID logoORCID:;