Simplified high-frequency model for AC drives

The development of simulation models that describe the high-frequency behaviour of all the components in an electrical drive, can be considered as a very useful tool. The usefulness of these models exceeds the description of the disturbances caused by the drive elements (overvoltages, bearing currents, EMI, etc.). From these models, the influence of the system elements on the disturbances can be evaluated. This paper proposes a complete model consisting of simple structures representing every drive element: motor supply cable, ground system, electrical machine, electronic converter and power line. A complete system model allows the development of mitigation techniques that take into account all the perturbations. In addition, the proposed methodology allows calculating values for the different system parameters derived from tests carried out with the converter. The results show that the model is accurate enough to describe the high-frequency drive behaviour.