Abstract

The Network DC project aims to advance industry readiness to deploy DC Circuit Breakers (DCCBs) and develop offshore HVDC networks. DC grid designs should have vendor-agnostic specifications for DCCBs and HVDC converters that enable staged implementation of a DC Switching Station (DCSS). This requires limiting DC fault currents to prevent blocking of already installed converters on the non-faulted parts of the DC grid. Electromagnetic transient (EMT) studies have demonstrated that a combination of mitigation options may be needed. The paper describes the problem context and current state of the art and explains each mitigation option with an assessment of effectiveness. Simulation results and analysis illustrate selected options and highlight technical challenges.

Colin FooteSuresh Rangasamy, Asif Khan , Ben Marshall, Alberto Bertinato, Hind Bekkouri, Sebastian Neira Castillo, Paul Judge, Stephen Finney, Seyed Saeid Heidari Yazdi

Presented at IET ACDC 2025