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This paper presents a dynamic model of asynchronized generator (ASG) for transient stability studies. With this dynamic model, ASG can be represented in various levels of detail, ranging from the constant flux linkage model to the six-order model with a representation of field circuits, damper windings and field saturation. The model proposed has been implemented in a time domain transient simulation program based on the Newton method and trapezoidal integration rule. The WECC 9-bus 3-machine system is used as a base case and modified to simulate multimachine power systems including ASGs. Transient stability of the system is examined and compared using the following three cases: (i) including synchronous generators only, (ii) including ASGs only, and (iii) including both synchronous and asynchronized generators. Simulation results demonstrate that ASGs in power systems can greatly improve transient stability of the overall system.