DC protection for a multi-terminal HVDC network including offshore wind power, featuring a reduced DC circuit breaker count

Parker, Max A. and Holliday, Derrick and Finney, Stephen J. (2019) DC protection for a multi-terminal HVDC network including offshore wind power, featuring a reduced DC circuit breaker count. The Journal of Engineering, 2019 (17). pp. 4511-4515. (https://doi.org/10.1049/joe.2018.8149)

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Abstract

Large offshore wind farms located far from shore, as are being planned or built in the North Sea, will require high-voltage DC (HVDC) transmission to shore, and multi-terminal HVDC could offer further benefits. Currently proposed methods to protect against faults in the DC network are based on extremely fast-acting DC circuit breakers located on all cable ends, leading to high cost. A method is proposed based around discharging the DC network to isolate the fault, which drastically reduces the circuit breaker requirement, while making use of the inherent current-limiting behaviour of the wind turbines. The validity of this approach is demonstrated in simulation.

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