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Abstract
The usage of power electronics in power systems is one of the key
techniques for boosting the development of microgrids. Particularly,
in the case of public lighting systems, power electronics converters
are applied to both the LED driving stage and the grid interfacing
stage. From the point of view of the grid, the latter stage usually
behaves as a high power factor (PF) load. However, recent
trends in these systems imply a manifold of different storage and
renewable energy microgeneration units connected to the DC
bus of each street lamp. All together are usually known as lighting
smartgrids. The present work aims for keeping the DC bus stable,
injecting or extracting energy whereas maintaining high PF with
respect to the AC grid. This idea is performed by means of a
power droop control that provides the current reference to the
grid-tie power converter: a bidirectional bridgeless discontinuous
conduction mode (DCM) Flyback converter. This paper defines,
explains and implements a power droop control as well as a
novel unified switching pattern for the bidirectional DCM Flyback
converter, suitable for both inverter and rectifier operating
modes. Another contribution is that the proposed switching
pattern enables for a smooth transition between these modes.
The proposed strategy provides the pulses for every switch at the
interfacing stage in the adequate sequence, thus simplifying the
design and implementation of the power and control stages. The
proposed switching pattern is validated through experimental
results.
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