Analysis of AC/DC mutual interaction in low voltage multi-terminal DC system under fault state

Low voltage multi-terminal DC system is one of the essential network structures to access a large portion of distributed energy in and improve the system reliability and capacity of power supply. The system stability has attracted widespread attention. This paper describes the representative system structure, and constructs the coordinated schemes of system control like master-slave control mode and droop control mode. On this basis, the impact of AC faults on DC network is analyzed under different control strategies. A MATLAB/Simulink simulation model is established for example verification, and the corresponding test platform is built for experimental verification. The research in this paper can provide an effective method to analyze the interaction of low voltage system with multiple ports, and this method can be used to design and integration test of system control strategies.