Nonlinear Robust Anti-Windup Control Design base on Precise Feedback Linearization
2019 IEEE 15th International Conference on Control and Automation (ICCA)(2019)
Abstract
For the control system of the hypersonic vehicle longitudinal dynamics model, an anti-saturation controller is implemented when the control input is over-saturated for a strong disturbance. To solve the tracking control problem of nonlinear systems with disturbance under control constraints, an anti-saturation robust controller based on feedback linearization is proposed. First, the nonlinear mathematic model is linearized via exact feedback linearization, and then the closed-loop gain designed by the robust control algorithm to tracking control with disturbance. According to the robust control theory, the better the anti-disturbance performance of the designed robust controller is, the easier the actuator will enter the over-saturation state when the aircraft is under strong disturbance. To solve this problem, an anti-saturation compensation element is designed by using the gain matrix feedback anti-saturation theory. When the actuator exceeds the saturation boundary, the compensator will modify the control output. Simulation analysis shows that the flight control system with the additional anti-saturation element can restrain the actuator over-saturation and improve the control capability under large disturbance.
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Key words
nonlinear robust anti-windup control design base,precise feedback linearization,hypersonic vehicle longitudinal dynamics model,anti-saturation controller,control input,strong disturbance,tracking control problem,nonlinear systems,control constraints,anti-saturation robust controller,nonlinear mathematic model,exact feedback linearization,robust control algorithm,robust control theory,anti-disturbance performance,designed robust controller,over-saturation state,anti-saturation compensation element,gain matrix feedback anti-saturation theory,saturation boundary,control output,flight control system,additional anti-saturation element,control capability
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