Improved Linear Active Disturbance Rejection Control and Parameter Tuning Method for Multi-input Multi-output Coupling System
Aiming at the problems of strong coupling,complex working conditions,strong disturbance and difficult parameter adjustment in the combustion system of thermal power units,an improved linear active disturbance rejection control(ILADRC)was proposed based on the existing linear active disturb-ance rejection control(LADRC).Firstly,according to the characteristics of large time delay and large inertia in thermal power system,an inertial time delay feedforward compensator was connected in series at the control input of the linear extended state observer(LESO)of LADRC,so as to realize the synchroni-zation of LESO feedforward and feedback signals,and improve signal follow-up and disturbance suppres-sion performance;then,through the open-loop frequency domain stability analysis,the relationship be-tween system stability index and controller parameters was obtained,so that the quantitative parameter setting rules based on system stability index were deduced to simplify the parameter adjustment process.The designed ILADRC was applied to the simulation system of coupling control of bed temperature and main steam pressure of thermal power unit,and compared with proportional integral differential(PID)controller,LADRC and MLADRC.The simulation results show that the proposed ILADRC has obvious advantages in setting value follow-up and disturbance suppression,and the Monte Carlo test further proves the robustness advantage of the proposed ILADRC.
combustion systemactive disturbance rejection controllarge time delay and inertiafeed-forward compensatorMonte Carlo test
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