A three-phase interleaved high step-up bidirectional DC–DC converter is proposed, which can achieve three times the voltage gain of the traditional three-phase interleaved boost converter only by adding two capacitors. The proposed converter has the characteristics of low switch voltage and current stresses, low output voltage ripple, automatic voltage-balancing and current-sharing abilities. Compared with the traditional interleaved switching strategy, a 180° interleaved switching strategy is proposed, which is more suitable for the proposed converter by widening the working duty cycle range. Closed dual-loop control is used to regulate the output voltage of the converter. The parameter determining the method of the closed-loop controllers based on the Bode diagram is described in order to control the high-order converter. Operating principle, modelling, steady-state analysis, voltage-balancing and current-sharing ability analysis and closed-loop design of the converter are studied in more detail. Finally, experimental verification and efficiency measurements are implemented by a 300 W, 24 V input to 230 V DC bus prototype, which proved that the proposed converter is more suitable than the traditional three-phase interleaved boost converter for some applications where requiring about six to ten times the voltage conversion ratio.

中文翻译：

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三相交错式高升压双向DC-DC转换器

提出了一种三相交错式高阶升压双向DC-DC转换器，仅需增加两个电容器即可达到传统三相交错式升压转换器的三倍电压增益。拟议的转换器具有低开关电压和电流应力，低输出电压纹波，自动电压平衡和均流能力的特点。与传统的交错开关策略相比，提出了一种180°交错开关策略，通过扩大工作占空比范围，它更适合于所提出的转换器。闭环双回路控制用于调节转换器的输出电压。描述了根据伯德图确定闭环控制器方法的参数，以便控制高阶转换器。工作原理，对转换器的建模，稳态分析，电压平衡和均流能力分析以及闭环设计进行了更详细的研究。最后，通过300 W，24 V输入至230 V DC总线原型实现了实验验证和效率测量，这证明了该转换器比传统的三相交错式升压转换器更适合某些应用，这些应用需要大约6到6 V的功率。电压转换率的十倍。