DC voltage control and stability analysis of PWM-voltage-typereversible rectifiers
Verdelho, P.; Marques, G.D.
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 2, Apr 1998 Page(s):263 - 273
Digital Object Identifier 10.1109/41.681225
Summary:A PWM voltage rectifier has useful characteristics on its DC and
AC sides. On its DC side, a DC-link unidirectional voltage is obtained
and bidirectional power transfer capability is possible by reversing the
flow direction of the DC-link current. On its AC side, near sinusoidal
current waveforms and AC four-quadrant operation can be obtained,
leading to high-quality power being exchanged between the power
converter and the mains. The use of AC filters becomes unnecessary. The
rectifier DC voltage must be regulated to a constant value. In this
paper, three solutions for the DC voltage control are presented. In the
first solution, the DC voltage is controlled by acting upon the
quadrature component of the power converter fundamental Park's voltages
with relation to the mains voltages. Slow responses are necessary
because of stability reasons. Also, load power variations produce both
active and reactive power variations in the power converter AC side. To
improve the DC voltage response, a second control solution is presented.
The power converter currents in Park's coordinates must be controlled.
The DC voltage is controlled by controlling the direct Park's current
component and, thus, acting only on the active power of the converter AC
side. Faster responses are achieved. In this case, load power variations
do not produce reactive power variations in the converter AC side. The
third control solution is a simplified version of this last one.
Experimental results from a 2 kVA IGBT-based prototype showing good
system dynamic performance are presented
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