PROJECT TITLE :

Load Model for Medium Voltage CascadedH-Bridge Multi-Level Inverter Drive Systems - 2016

ABSTRACT:

Medium voltage drives (MVDs) are commonly employed in high-power applications and show significant impact on the general system dynamics because of their large size and high power demand. Although detailed switching models for MVDs can be engineered using MATLAB/Simulink, such models cannot be employed in large-scale simulation software for Power System dynamic studies. To solve this drawback, the dynamic load model for the medium voltage cascaded H-bridge multi-level inverter drive and induction motor systems, that is suitable for power system dynamic studies, is proposed in this paper. Analytical formula of the model is presented. The model includes the aggregated effect of an MVD, an induction motor, and their Control System, and thus, it will accurately represent the dynamic responses of the motor drive system under disturbances. Each voltage and frequency dependence are considered in the model. The accuracy of the model is verified by a case study. A sensitivity study is conducted to guage the impact of the model parameter variation on dynamic response characteristics. The developed load model will be readily inserted in the big-scale power system simulation software for power system dynamic studies.