A dynamic load simulation system based on proportional-resonant control method

When a dynamic load simulation system is used to simulate load torque and inertia moment in the test of position serve systems, high precision load simulation is difficult to achieve in a wide frequency range due to the interference torque caused by movement of the system under tests. In order to improve performances of load simulations, a novel electric dynamic load simulation system based on the permanent magnet synchronous motor was proposed, in which proportional resonant control was added to the load torque loop controller. By the embedding proportional resonant controller with the corresponding frequency, the periodic interference torque can be restrained completely, and the periodic test torque can be tracked with zero steady-state error; according to the proportion relationship between position and acceleration under sinusoidal motion and combing with the proportional resonant controller, additional inertia of the system under tests can be simulated accurately. Moreover, the robustness of the proportional resonant controller in the electric dynamic load simulation system was analyzed by the theory of the internal model, and the root locus was used to design parameters of proportional resonant controllers. Simulation and experimental results of a 10Hz load simulation verify the feasibility and validity of the schemes proposed by this paper.