Research on Variable Droop Control Method for Improving Stability of Low-Voltage DC Distribution System

Low voltage multi-terminal DC system is one of the important forms of future power grids, and its commonly used control method is droop control. This article proposes a variable droop control mode based on traditional droop control and applies it to low voltage multi-terminal DC systems. Variable droop control has a larger operating boundary and better stability compared to traditional droop control. Similar to traditional droop control, the variable droop control strategy and key system parameters are closely related to the small signal stability of the system. In order to verify the stability of low voltage multi-terminal DC system based on variable droop control, this paper constructs a Small-signal model of low voltage multi-terminal DC system based on variable droop control, and uses the analysis method of dominant eigenvalue to study its stability and operating boundary. Validate through Matlab/Simulink simulation models, and compare the low voltage multi-terminal DC system based on variable droop with the low voltage multi-terminal DC system based on traditional droop. The results indicate that the variable droop control proposed in this paper has higher stability compared to traditional droop control.