Research on Active Disturbance Rejection Control of High-pressure Electro-pneumatic Servo Valve Based on NSGA-II Parameter Tuning

The spool of the high-pressure electro-pneumatic servo valve (HESV) is subjected to transient and steady gas flow force during operation, and there is unknown disturbance in the valve spool position control. In order to improve the position control accuracy and anti-disturbance ability of the valve spool, the mathematical model of HESV is established, and the linear ADRC (Active Disturbance Rejection Control ) for the position closed-loop control of the spool of HESV is presented. Meantime, in order to improve the dynamic and static performance of the control system, a multi-objective genetic algorithm NSGA-II (Non-dominated Sorting Genetic Algorithm with Elite Strategy) is used to optimize the control parameters of ADRC with three objective functions from the aspects of rise time, overshoot and energy minimum. Finally, the control simulation study of HESV is carried out, and compared with the traditional PID. The simulation results show that with parameters set by NSGA-II, ADRC has good control performance and anti-disturbance ability for the control of the valve spool position.