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Controllable Network Transformer (CNT)
A Controllable Network Transformer is a small AC converter augmented with an existing load tap changing transformer with a small AC converter to simultaneously provide dynamic control of bus voltage magnitudes and phase angles over a meaningful control range with no additional energy storage elements. The converter includes two AC switches, a small filter capacitor and an inductor where the 2 switches are initially controlled with fixed duty cycles D and (1-D). For voltage magnitude control, the commonly used pulse width modulation technique can be applied. For voltage phase angle control, the concept of "DualVirtual Quadrature Sources" is used.
Controllable network transformers provide dynamic control of bus voltage magnitude and phase angles as well as line currents.
 IEEE. URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=04592291
Key Technology Area:
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