A novel power factor control scheme for high-power GTO current-source converter

A novel power factor control scheme for high-power gate-turn-off thyristor current-source power converters is proposed in this paper. Using both feedforward and feedback control techniques, the proposed scheme guarantees that the input power factor of the power converter can be kept at unity or a maximum achievable value. Another feature of this scheme is that it is parameter insensitive, that is, variations in the line and load impedance or changes in the filter capacitor size will not affect the process of tracking the maximum input power factor. No parameters in the control scheme should be adjusted to accommodate such variations or changes. Simulation and experimental results are provided to verify the operating principle of the scheme.