| In the presence of grid voltage harmonics, an AC-DC-AC drive with conventional fundamental frequency control experiences large line current harmonics, and in the case of a minimized DC link capacitance, large DC link voltage ripple harmonics. This thesis presents and compares two control methodologies that overcome this problem and suppress the effects of grid voltage harmonics on AC-DC-AC converters with minimized DC link capacitance. The first harmonic mitigation controller is implemented via multiple synchronous frame control structure somewhat similar to those used in active power filter applications. The other harmonic mitigation controller is realized in the stationary frame with several variations to the controller via the inclusion of cross-coupling control and feedback terms. |
