DC cable modelling and High Voltage Direct Current grid grounding system

This paper describes the influence of grounding on voltage and current transients during DC-link fault in a High Voltage Direct Current (HVDC) cable system. After presenting the topology and the modelling of the HVDC system, the paper focuses on cable parameters calculation and on propagation behavior of travelling waves during fault conditions. DC short-circuit fault is then simulated for different cable screens as well as converter station neutral points grounding impedances. The results presented in the paper provide a preliminary insight for HVDC grid protection system design.