Research on ADRC controller design for three-phase UPS with multi-disturbances

This study focuses on detailed analysis of disturbance for three-phase uninterruptible power supply (UPS) in reality, as well as design of active-disturbance rejection controller (ADRC) and simulation of the corresponding model with multi-disturbances. Parameters of LC-filter will change with UPS operation. Also, UPS not only has pure resistive load, but also resistive-inductive load, and sometimes even non-linear load. The authors take the above disturbance of uninterruptible power supply into consideration at the beginning. Then, according to the above analysis of disturbances, a mathematical model with disturbance term is established. After, the active-disturbance rejection controller is designed to depress the disturbances from internal part and external part. Finally, the corresponding simulation is conducted in order to verify the precision of modelling and the effectiveness of ADRC control strategy.