| Abstract |
This paper describes the first part of the steady-state
simulation results of a project aiming at the further
development of unidirectional three-phase rectifiers. The
main goals of this project are to reduce the line current
harmonics and to be able to adjust the DC-link voltage. The
component count and cost are also taken into consideration.
Simulated rectifier topologies are the conventional 6-pulse
rectifier, single-switch boost-rectifier, three-switch (half
bridge) boost-rectifier and single-switch buck-boost
rectifier. These topologies are designed to operate at 50kW
rated power so that the total harmonic line current
distortion is within the limits stipulated in the technical
report IEC 61000-3-4. The DC-link voltage in the active
topologies is set at 650V. Constant duty-cycle open loop
control is applied at a switching frequency of 3.5kHz. On
the basis of the simulation results, the power losses and
voltage and current ratings of the components needed in the
main circuits and filters are determined. With the help of
these results, the four rectifier topologies are compared. |
