Capability Chart is a general well known engineering tool, extensively used in different fields. In this paper they are preliminarly applied to offshore wind farms to evaluate the TAP (transmissible active power) with long AC cables. The tool is even more useful with floating offshore projects with longer distance and wide combinations of dynamic and static cables. Nowadays Floating offshore wind has the potential to unlock resource areas at water depths up to 800 m, where the wind blows stronger and 'almost uninterrupted' and therefore the floating case is relevant. By introducing a single-phase modelling of the export cable based on the transmission matrix, it is possible a computational plot of TAP at a unity power factor as a function of the export cable length. This algorithm is completely general and it is here applied including hybrid combinations (static, dynamic, different cross-sections of the three-core cables, connection between submarine and land cable) up to the Point of Common Coupling to the Grid (PCC). Then, the capability charts developed by the Laboratory of Electric Energy Transmission of Padova University to assess the loadability of any AC transmission line (and consequently also of insulated cables) belonging to the meshed grid are generalized to take into account the voltage magnitude/reactive power capability constraint of the wind turbines.
Loadability of AC Export Cables in Off-Shore Wind Farms by Means of Power-Flow-Based Capability Charts
Benato R.
;Sanniti F.;
2025
Abstract
Capability Chart is a general well known engineering tool, extensively used in different fields. In this paper they are preliminarly applied to offshore wind farms to evaluate the TAP (transmissible active power) with long AC cables. The tool is even more useful with floating offshore projects with longer distance and wide combinations of dynamic and static cables. Nowadays Floating offshore wind has the potential to unlock resource areas at water depths up to 800 m, where the wind blows stronger and 'almost uninterrupted' and therefore the floating case is relevant. By introducing a single-phase modelling of the export cable based on the transmission matrix, it is possible a computational plot of TAP at a unity power factor as a function of the export cable length. This algorithm is completely general and it is here applied including hybrid combinations (static, dynamic, different cross-sections of the three-core cables, connection between submarine and land cable) up to the Point of Common Coupling to the Grid (PCC). Then, the capability charts developed by the Laboratory of Electric Energy Transmission of Padova University to assess the loadability of any AC transmission line (and consequently also of insulated cables) belonging to the meshed grid are generalized to take into account the voltage magnitude/reactive power capability constraint of the wind turbines.
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