Bias Voltage Controlled Three-Phase Converter with High Power Factor

In rectifier systems, the compensation of reactive power accompanied with conventional line commutation is a significant problem. The most desirable and effective technique for realizing reactive power compensation is not the addition of more reactive compensators but the improvement of the converter circuit in itself. The new three-phase converter using the latter technique is proposed and discussed. It consists of a combination of the bias voltage control and the conventional phase control. The original scheme of this was presented in [1] for the single-phase type. The new three-phase converter scheme, its operation, characteristics such as power factor, harmonic contents of line current, design indexes, and experimental results are described. The new converter proposed will be suitable for large power systems.