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Variable Frequency Transformer (VFT) is a controllable bi-directional transmission device that can transfer power between asynchronous networks. It avoids both HVDC link and FACTS based power transmission control system. Basically, it is a rotatory transformer whose torque is adjusted in order to control the power flow. In this paper, a simulated model of VFT is used as a controllable bidirectional power transmission device that can control power flow through the connected asynchronous power systems. A simulation model of VFT and its control system models are developed with MATLAB and a series of studies on power flow through asynchronous power systems are carried out with the model. The response characteristics of power flow under various torque conditions are discussed. The voltage, current, torque and power flow plots are also obtained.