Linearization Approach for Modeling Power Electronics Devices in Power Systems

Power electronics devices are extensively used in renewable energy resources, modern power grids, and industrial facilities. In this paper, a linearization approach is proposed as a generic dynamic modeling method for power electronics devices in power systems. The associated control system is included in the modeling. This approach can be readily used for renewable energy resources, such as wind turbines and solar photovoltaic systems, and for power electronics devices in power systems, such as variable frequency drives (VFDs). The developed dynamic models are suitable for power systems dynamic studies. To demonstrate the effectiveness of the proposed approach, the dynamic load model of a system, consisting of a voltage source inverter type low-voltage six-pulse VFD and an induction motor, is developed in this paper, and a sample motor drive system is provided as a case study to verify the accuracy of the developed dynamic load model.