DC-side fault current estimation approach for HVDC circuit breaker sizing

Selection of the interruption capabilities HVDC circuit breakers (DCCB) requires an estimation maximum DC-side fault current and absorbed energy. However, estimating these iterating over a large range scenarios. At present, this task is performed for specific grid using extensive time domain simulations in Electromagnetic Transient (EMT)-type software. These require computational effort, especially large-scale meshed grids. In paper, alternative approach based on numerical inverse Laplace transform proposed to reduce burden DCCB parameters without need EMT simulations. The includes pre-fault conditions, stages converter response, operation detailed transmission line model. paper shows that energy DCCB, can be approximated accurately operating times within first two while upper limit quantities estimated DCCBs subsequent stages. allows investigating scenarios grids with acceptable sufficient accuracy adaptability system configuration/parameter changes.