East Anglia THREE Offshore Windfarm Converter station


What‘s involved? East Anglia THREE will be required to construct an onshore substation to connect to the national grid transmission network. If it were to use high-voltage DC (HVDC), the substation would be required to convert the DC into AC to connect the offshore windfarm to the National Grid. If East Anglia THREE is constructed using LFAC, a substation would be required to increase the frequency to the levels within the transmission network.


As well as the substation hall(s), the substation compound would contain: • Electrical equipment, for example, power transformers and switchgear;


• Control buildings; • Access routes; and • Fencing.


The maximum dimensions of the substation compound would be 150 m (width) × 190 m (length) if using an HVDC system, and 160 m (width) × 190 m (length) if using an LFAC system. The maximum height of the substation hall would be 25 m.


The project team will be working with landscape architects to ensure the building is sympathetic to the local architecture and that a suitable planting scheme is proposed to provide screening.


Illustrative drawing of the substation compound (Source: Royal HaskoningDHV).


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