Sliding mode controller of hydraulic generator regulating system based on the input/output feedback linearization method

• The nonlinear hydraulic generator regulating system (HGRS) model is studied.
• This kind of HGRS system considers the external disturbances and system uncertainty.
• The input/output feedback linearization method is used to establish the relationship.
• Sliding mode controller (SMC) is applied to adjust the orbit output of HGRS system.
• PID controller is employed to the adjustment process in HGRS system as a comparison.

An input/output feedback linearization method based sliding mode control strategy is proposed for the hydraulic generator regulating system (HGRS) with external disturbance and system uncertainties to enhance its response. Based on the input/output feedback linearization method, the relationship between reference output and control output is established. Then a sliding mode controller is designed to reject the influence of external disturbance and system uncertainties on the system performance and compelled the current dynamic output exponentially stabilized at their reference states. In order to eliminate the inherent harmful chattering phenomenon of sliding mode controller, a high-slope saturation function is used to replace the discontinuous sign function in the sliding mode manifold design. Several simulations with respect to the dynamic analysis of HGRS system without controller, fixed point stabilization, periodic orbit tracking and robustness test against random noises have been carried out to test the effectiveness of the proposed controller technique. The results show that the proposed sliding mode controller improves the nonlinear HGRS system performance with an accurate precision and a shorter time in all cases.