Article,

VFT Application for Asynchronous Power Transfer

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ACEEE Int. J. on Control System and Instrumentation, (February 2013)

Abstract

The variable frequency transformer (VFT) developed recently is a flexible asynchronous ac link which is used to transfer power in-between asynchronous power system networks. The first VFT was installed at the Langlois substation, which interconnects the New York (USA) and the Hydro-Québec (Canada) systems. Basically, it is a rotary transformer whose torque is externally adjusted in order to control the power transfer. In the paper, a simulated model of VFT is present, which is used as a controllable bidirectional power transmission device that can control power transfer through the asynchronous power system networks. A digital simulation model of VFT and its control system are developed with MATLAB Simulink and a series of studies on power transfer through asynchronous power system networks are carried out with this model. M oreover, the response characteristics of power transfer under various torque conditions are discussed. Further voltage, current, torque and power transfer plots are also obtained. Thus, the VFT concept and its advantages are verified by simulation results.

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