PSCAD/EMTDC-based simulations for fault analysis and fault identification in 380V ring DC systems

摘要

With an increasing number of DC driven components in power networks, the introduction of 380V DC distribution grids appears to be a valuable option. Besides all positive aspects of DC systems (e.g. high efficiency, the absence of reactive power, etc.), system protection represents the major challenge which needs to be clarified for DC systems. Advanced AC protection equipment's and methodologies are not sufficient in DC environments. In the current research, fault analysis of 380V DC-Microgrid was performed using PSCAD software. Fault behavior was tested with the application of faults at different locations. All components were connected to the grid through two smart switchgears' which incorporated current and voltage sensors. The recorded data were analyzed and current derivatives were identified as the most crucial parameters for fault detection. Based on that, a credit point concept was set up to filter derivative oscillations in regular operating conditions and to standardize fault indicating values.