一种应用于光伏并网发电系统的新型双输入DC-DC变换器
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海南省自然科学基金资助项目(517183);辽宁省百千万人才工程资助项目(20150101)


Novel Dual-input DC-DC Converter for Photovoltaic Grid-connected Power Generation System
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Hainan province natural science foundation of China(517183); Liaoning province million talents engineering project(20150101)

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    摘要:

    提出一种具有高增益低电压应力的双输入DC-DC变换器,该变换器由2个上下对称的耦合电感Boost变换器组成。具有单输入和双输入2个模式,在单输入状态下只有一个开关管工作;在双输入状态下有2个开关管工作。新型变换器可以通过改变耦合电感的匝比来提升变换器电压增益;输出端采用三电平结构使变换器开关管和二极管电压应力减小。分析了变换器在单输入和双输入模式下的工作模态;给出了变换器主要工作波形;推导了变换器电压增益,开关管和二极管电压应力,分析了漏感对变换器电压增益的影响。通过实验验证了理论分析的正确性。

    Abstract:

    A novel dual-input DC-DC converter with a high gain and a low voltage stress is proposed, which consists of two upper and lower symmetrical coupled inductor Boost converters. It has two modes, i.e., single-and dual-input, in which one and two switching tubes work, respectively. The novel converter can increase its voltage gain by changing the turns ratio of the coupled inductor. A three-level structure is used at the output terminal, thus reducing the voltage stress in the switching tube and diode. The operation modes of the converter with single- and dual-input are analyzed, and its main working waveforms are given. Its voltage gain and the voltage stress in the switching tube and diode are also derived. In addition, the influence of leakage inductance on the voltage gain of the converter is analyzed. Experimental results verified the correctness of theoretical analysis.

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李洪珠,刘飞扬,李洪璠.一种应用于光伏并网发电系统的新型双输入DC-DC变换器[J].电源学报,2022,20(2):9-16

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  • 收稿日期:2019-01-03
  • 最后修改日期:2019-02-19
  • 录用日期:2019-02-19
  • 在线发布日期: 2022-04-15