Study on Full Bridge LLC Resonant Converter Based on LADRC in Marine DC Power Supply System

In this paper, we investigate the use of a full bridge LLC resonant converter with linear active disturbance rejection control to improve the power density, conversion efficiency, and voltage regulation rate of marine DC power supply. To balance the design difficulty and accuracy of the LADRC scheme, the system order is reduced from three to two. The design process for third-order line expansion state observer and linear state error feedback is also derived. Meanwhile, the LESO's stability is evaluated by investigating the convergence of the observational error. To verify the effectiveness of the LADRC scheme, Simulations and experiments are conducted in the paper, the results demonstrated that the marine dc power achieves faster transient response speed and smaller output ripple when using the LADRC scheme instead of a PI controller.