Four-wire current-regulated PWM voltage converter
Verdelho, P.; Marques, G.D.
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 5, Oct 1998 Page(s):761 - 770
Digital Object Identifier 10.1109/41.720333
Summary:Shunt active power filters are connected in parallel with the
electricity supply network. If the AC mains has a neutral conductor, it
is desirable to compensate the mains harmonic currents zero-sequence
components. This can be achieved with a four-wire pulsewidth modulation
voltage converter connected to the AC mains. In this case, the
three-phase and the neutral AC currents must be controlled. A
generalization of the space-vector-based current controller in the
αβo coordinate system is presented in this paper. With this
current controller, all the current harmonic systems of positive,
negative, and zero sequence can be injected by the converter and, thus,
compensated on the AC mains. The system is also useful to compensate
unbalanced currents of fundamental frequency. A useful benefit of this
system is that it is possible to control the converter four-wire
currents with equal hysteresis errors. Simulation and experimental
results are presented
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