A novel modular fault limiting strategy for LVDC distribution networks

To enhance fault handling capacity for low-voltage DC distribution networks and mitigate the detrimental effects of faults on converter apparatus, this research introduces an innovative fault suppression and handling strategy. The proposed strategy entails the integration of multi-port fault limiting modules (FLM) with DC circuit breakers (DCCBs) and conversion systems, such as DC transformers, thereby enhancing the system’s current and voltage regulation. This integration facilitates the use of more economical DCCBs while improving the fault-ride-through capabilities of the conversion equipment. Under normal operating conditions, the FLM is circumvented to reduce system disturbances. In the event of a fault, the FLM is engaged to curtail fault currents and preserve voltage stability. The validity of the proposed method is confirmed by constructing equivalent modules within PSCAD/EMTDC and conducting comprehensive simulations across a variety of fault scenarios.