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首页> 外文期刊>International journal of circuit theory and applications >Three-phase step-up/step-down isolated dc-dc converter with wide-range duty cycle for low dc renewable energy sources applications
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Three-phase step-up/step-down isolated dc-dc converter with wide-range duty cycle for low dc renewable energy sources applications

机译：具有宽占空比的三相升压/降压隔离式DC-DC转换器，适用于低dc可再生能源应用

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摘要

Renewable sources of low voltage are an important resource in power generation systems. Many provide high output current at low voltage, as the photovoltaic modules and fuel cells systems, therefore, become more popular considering the safety requirements. In this paper, a novel current-fed three-phase dc-dc converter with high-frequency isolation transformer is proposed. This one has the main features as high dc voltage gain, reduced switches count, minimize the volume of the output/input filters, the frequency ripple of the input current and output voltage are three times higher than the switching frequency, best losses distribution and reduced stresses in the circuit. Moreover, it operates with wide-range duty cycle, the soft-start can be used, which allows the input current and the output voltage to be started gradually. Operating with a duty cycle of 1/3 and 2/3, the input current ripple is canceled. The proposed converter is studied qualitatively and quantitatively, being presented the operation principle in continuous and discontinuous conduction mode, dc voltage gain in each operation mode, and the voltage and current stresses for the power components sizing. To validate the operation of the proposed converter, the laboratory design example and experimental results are presented to demonstrate the performance and validate the claims of the converter for wide load variation. Experimental results are presented for a 4-kW prototype, operating in R2 region for continuous conduction mode. Additionally, experimental results in R1 and R3 regions are obtained.
机译：可再生的低压电源是发电系统中的重要资源。考虑到安全性要求，许多光伏组件和燃料电池系统会在低压下提供高输出电流，因此越来越受欢迎。本文提出了一种新型的带高频隔离变压器的电流馈电三相dc-dc转换器。它的主要特点是：高直流电压增益，减少开关数量，最小化输出/输入滤波器的体积，输入电流和输出电压的频率纹波是开关频率的三倍，损耗分布最佳并降低电路中的压力。此外，它以宽范围的占空比工作，可以使用软启动，从而允许逐渐启动输入电流和输出电压。以1/3和2/3的占空比工作，输入电流纹波被消除。对提出的转换器进行了定性和定量研究，介绍了连续和不连续导通模式下的工作原理，每种工作模式下的直流电压增益以及功率分量的电压和电流应力。为了验证所提出的转换器的操作，给出了实验室设计实例和实验结果，以证明其性能并验证针对宽负载变化的转换器要求。给出了一个4 kW原型的实验结果，该原型在R2区域中以连续传导模式运行。此外，获得了R1和R3区域的实验结果。

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