Super-Twisting Sliding Mode Control Design for Electric Dynamic Load Simulator

Electric dynamic load simulator (EDLS) plays a vital role in new product invention for it can be used to produce desired load torque on loaded object to test its performance and stability, which is preferred by researchers for its high speed response and high precision loading. However, conventional control methods are hard to obtain satisfactory results, for the interfere of nonlinearity and surplus torque in EDLS. In order to realize high precision loading, this paper proposes and implements a super-twisting sliding mode (STSM) control strategy for electric dynamic load simulator. The mathematical model of EDLS is built first in this paper, to establish foundation for designing the STSM controller. The finite time convergence condition of the STSM control law is presented. The STSM control law is designed based on the real-time tracking error of load torque, which can get high dynamic and high precision loading. Experimental results are provided and compared with conventional PID control strategy to validate the effectiveness of the proposed control approach.