On Disturbance Rejection of Load Simulator Using Model-based ESO

To increase the suppression rate of surplus torque of load simulator, this paper proposes a high-performance model-based extended state observer(ESO) to estimate the total disturbance and compensate the system as the nominal model of actual system. First the third-order model-based ESO is designed for a class of second-order systems in which the model information is used in ESO structure to improve performance. And a parameter tuning method with better noise suppression ability and observation performance, instead of the classic pole-placement method, is used to obtain accurate disturbance observation, which can effectively enhance the surplus torque suppression ability of the load simulator. Furthermore, experiments on actual load simulator are conducted to verify the effectiveness and superiority of this method.