Power balance control technique of the modular three-phase ac to dc converter with fast transient response

This paper presents a power balance control technique for a modular three-phase ac to dc converter with nearly unity power-factor and fast transient response. The power balance control technique is used to obtain the three-inductor current compensator, thus, resulting in the output impedance and audio susceptibility become zero, that is, the output voltage of the converter presented in this paper is independent of variations of the dc load current and the source voltage. To improve the dynamic performance, minimal total harmonic distortion in the source current and inductor currents sharing, a proposed control method is employed in the voltage feedback loop. The proposed procedure of analysis is simple and effective. The implementation of this control circuit uses only analog circuitry. Simulation and experimental results are presented to verify the feasibility of the control strategy.