Performance analysis of DC circuit breakers for future HVDC grids in GB

This paper analyses the performance of two different types of Direct Current Circuit Breaker (DCCB) models (hybrid and mechanical) in High Voltage DC (HVDC) networks so that the capabilities and technical specifications of DCCBs can be determined before they are adopted in future multi-terminal HVDC networks in GB. Achieving the 2050 net zero objectives, which will mean linking up to 100 GW of offshore wind to the GB system, necessitates the advancement of HVDC networks beyond the existing point-to-point connections or limited multi-terminal designs. To facilitate the development of multi-terminal HVDC networks, it is necessary to investigate and demonstrate the functionalities of DCCBs. These devices enable the selective and swift disconnection of faulty components, thereby enabling the introduction of more complex topologies and more extensive HVDC networks. The paper briefly outlines the modelling procedures for generic mechanical and hybrid DCCBs. It presents a hypothetical scenario involving a multi-terminal HVDC network, considering the prospective expansion of HVDC connections within the GB transmission system. The evaluation of DCCB performance and specifications is established through numerous simulations conducted in a real-time simulation environment involving different DC fault location and pre-fault power flow simulation scenarios.