Engineering Simulation Analysis and Demonstration Application of Multi-terminal DC Distribution System

Based on the background of DC normal education project in the Jinji Lake core area of Suzhou Industrial Park, this paper discusses the key technologies in the practice of multi-terminal DC power distribution technology engineering. Firstly, the basic situation of Suzhou four-terminal DC project was outlined, and the key electrical equipment and its selection principle were analyzed, including the converter valves, bridge arm reactors, link transformers, and DC monitoring and protection systems. Secondly, based on the RTLAB real-time simulation platform, the simulation model of Suzhou four-terminal DC distribution system was built. Finally, based on the RTLAB simulation model, single-ended converter startup, four-terminal stable operation, active power step and reactive power step were simulated. The simulation results show that the four-terminal DC grid model has good steady state performance and active power and reactive power step response performance. It can provide reference for the future DC distribution network construction.