Research on Power Information Hybrid Simulation Technology of DC Distribution Network Based on Multi-terminal Flexible DC

The multi-terminal flexible DC distribution network can realize the power supply of distributed power supply and the flexible operation of multiple DC loads, which is an important development direction of the future DC distribution network. The coordinated control and communication coordination of each converter station and multi-converter is the key to the safety and stability of DC distribution network. Therefore, in view of the physical information coupling characteristics of multi-terminal flexible DC systems, considering the coordinated control stability characteristics and information interaction capabilities between multi-terminal flexible converter stations, a master-slave control strategy based on multi-site cooperative communication is proposed. Then, combined with the real-time power simulation system RT-LAB and the network simulation tool OPNET, a power information hybrid real-time simulation platform for multi-terminal flexible DC distribution network is constructed to analyze the power information interaction process in different communication environments and its application to DC distribution network. Finally, with the Suzhou Four-Terminal Flexible DC Network Project as an example, the effectiveness of the proposed coordinated control strategy and power information hybrid simulation platform is verified by setting network communication congestion and delay in typical scenarios such as fault-locking and DC load disturbance of the master-slave converter station.