AC Electronic Load Based on ESO and Improved Sliding Mode Compound Control
Aiming at the problem of poor input current tracking accuracy and weak disturbance rejection a-bility of load analog unit in energy-fed AC electronic load,this paper studies a compound control strategy based on extended state observer(ESO)and improved sliding mode control.In order to weaken the chat-tering problem of sliding mode control,a new reaching rate is proposed according to the respective advan-tages of power reaching rate and exponential reaching rate,and an improved sliding mode controller is de-signed to reduce the chattering when the current is stable.At the same time,the extended state observer is used to observe the circuit parameter perturbation and external disturbance and compensate the sliding mode control rate.Finally,the simulation results show that compared with the traditional PI control,the proposed control method has better current tracking ability and anti-interference ability.
three-phase PWM rectifiersliding mode controlextended state observer
万方数据
维普
