For improving the anti-interference ability of the flexible multi-state switch (FMSS) so to ensure stable DC voltage in the case of system interference

a kind of FMSS DC voltage control strategy based on linear active disturbance rejection control (LADRC) is proposed in this paper. Its control strategy can integrate the uncertain factors acting on the research object into the total disturbance of the system

and real-time tracking estimation and compensation of the disturbance so as to suppress the system interference. The FMSS is modeled by Matlab/Simulink

and the linear active disturbance rejection controller module is designed to replace the PI controller module in the voltage outer loop and the current inner loop. Under the condition of system interference

the anti-interference ability of FMSS is experimentally verified. The simulation results show that compared with the traditional PI double-loop control strategy

the LADRC-based control strategy can better deal with a variety of system interference

can effectively improve the ability of system interference suppression and maintain stability of the FMSS DC voltage.