Abstract：A sliding mode linear self disturbance rejection control strategy was proposed to address the output

voltage fluctuations caused by sudden load changes，changes in DC bus voltage，disturbance addition，and other

disturbances in three-phase interleaved parallel DC-DC converters. Firstly，a mathematical model of three-phase

interleaved parallel DC-DC converter in the s domain was established and the principle of energy transmission

imbalance was analyzed. Then，based on the system order，appropriate observers and linear auto-disturbance

rejection controllers were designed. Furthermore，in order to improve the ability to suppress the fluctuation of the

output voltage of the system，sliding mode control was introduced to form a sliding mode linear auto disturbance

rejection control，which improves the anti-interference and rapidity of the system. Finally，multiple operating

conditions were designed to simulate and verify the new control strategy. The results show that compared with

traditional control strategies，sliding mode linear active disturbance rejection control not only has excellent voltage

fluctuation suppression ability，but also has superior steady-state operation ability and transient traversal ability，

ensuring the balance between system capability transmission.

      Key words：DC-DC inverter；linear active disturbance rejection control（LADRC）；observer；slide mode

contro（l SMC）