Abstract: In this paper, a simple 3-bus power system model which includes a dynamic induction motor model is analyzed and simulated to study voltage collapse. Voltage collapse means the voltage of the electrical system suddenly declines to an unacceptable level. The system parameter analysis shows that the initial conditions, parameters and change of the demand of electrical can result in voltage collapse. When perturbation is applied to the system, voltage collapse can be delayed or controlled. Simulation results show the feasibility of the method.