基于输出端谐振解耦的三端口直流变换器

针对三端口变换器的功率耦合问题,提出基于输出端谐振解耦的三端口变换器,通过在输出端全桥构造谐振腔来解除控制量对光伏端口和储能端口的功率耦合作用,将三端口变换器等效为2个输出并联的二端口变换器,并直接沿用二端口变换器系统的控制策略,使控制过程更加简单平滑,降低三端口变换器的控制环节设计难度。首先介绍变换器的拓扑结构,并分析电路的功率传输特性和变换器的控制稳定性;搭建输出功率500 W的实验样机,对拓扑结构和控制策略的有效性进行验证。

THREE-PORT DC/DC CONVERTER BASED ON RESONATING DECOUPLING OF OUTPUT-SIDE

According to the power coupling problem of three-port converters, a three-port DC/DC converter based on resonating decoupling of output-side was proposed. The resonant cell is constructed at the full-bridge of the output-side to remove the power coupling effect of control quantity on photovoltaic port and energy storage port. The three-port converter is equivalent to two output parallel two-port converters, and directly uses two-port converters system control strategy, which makes the control process easier and faster and reduces the design difficulty of the control links of the three-port converter. First, the topology of the converter is introduced, and the power characteristic models before and after decoupling are established, the control stability of the converter is analyzed. An experimental prototype with output power of 500 W was built to verify the effectiveness of the topology structure and control strategy.