Research on Fault Detection Scheme for Hybrid LCC-MMC System

Compared with AC distribution network, DC distribution network has economic and technological advantages in many fields, but the access of high-density distributed power brings a huge challenge to the fault detection of the distribution network. The power electronic equipment contained in the DC distribution network is susceptible to the impact of inrush current, and a fast fault detection solution is urgently needed. In addition, influencing factors such as line distributed capacitance, synchronization error, and noise interference reduce the reliability of traditional fault detection schemes. A detection scheme based on wave impedance Minkowski distance is proposed to improve the existing technology. The program uses the Minkowski distance measurement to measure the correlation of wave impedance, and then identify internal and external faults. Theoretical analysis and simulation results show that the detection scheme based on Minkowski distance has high reliability and obvious advantages.