基于倍频采样的两相交错并联三电平双向直流变换器功率均衡解耦控制策略

A decoupled power-balancing control strategy for the two-phase interleaved parallel three-level bidirectional DC-DC converter is proposed in this paper, and the use of current sensors is effectively reduced. By analyzing the working principle of topology, an equivalent two-level analysis method under the two-phase interleaved parallel topology is obtained. On this basis, a decoupled power-balancing control strategy based on total current time-sharing and frequency-doubling sampling is proposed to fully decouple the voltage regulation of the converter from the current-balancing control between phases. In addition, the four channels of current sampling required by the conventional balance control are reduced to two channels, which simplifies the control structure. A small signal model based on the equivalent topology is established, and the specific design scheme of the controller parameters is given. Finally, the proposed control strategy is verified by a physical experiment.