Document Type : Original Article
Electrical Engineering Department, Engineering Faculty, Razi University, Kermanshah, Iran
Department of Electrical Engineering, Razi University, Kermanshah
faculty of electrical engineering,university of razi,kermanshah,iran
The accuracy of the load-frequency control (LFC) system depends on the accuracy of models used for the components that affect the frequency response. In the conventional LFC system, the frequency-sensitive loads, including induction motors, are simply modeled by the load-damping coefficient. The purpose of this paper is to obtain the fifth-, third- and first-order induction motors models for applying in the LFC system. Also, in this paper, the performance and accuracy of these models on the frequency response in a small-scale stand-alone microgrid are compared. In addition, the effect of system and motor parameters on the frequency response characteristics are investigated. The simulation results point out that the commonly used constant load-damping coefficient model cannot always appropriately reflect the impact of the induction motors on the frequency response. In addition, it is shown that a constant load-damping coefficient cannot present an accurate model for all induction motors when a significant disturbance has occurred in the low-inertia microgrids.