Abstract:
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Future grids will consist of large scale of integration of
both renewable and other distributed energy sources. Therefore,
advanced power electronics converters for critical loads will be
needed in order to enhance power quality, and to ensure proper
and secure operation of future grids. These power converters must
be able to provide intelligent power management as well as
ancillary services. This paper proposes a solid state transformer
(SST) which consists of medium frequency transformer and threelevel
flying capacitor (FC) topology for intelligent power
management. It is tested under various grid events such as voltage
excursions, phase jumps and frequency variations. Moreover, it is
tested against load disturbances such as load transients and nonlinear
loads. The SST enhances power quality compatibility and
provides good isolation of perturbances between the grid and the
loads. The SST is also able to deliver ride through capabilities,
which can isolate short term disturbances from the grid to the
loads and vice-versa. The Power quality enhancement features are
validated under various source and load conditions using
computer simulation. |