为解决光伏发电等新能源发电技术输出的直流电压等级较低、不能满足并网电压要求的问题,提出一种可应用于新能源发电系统的双绕组高效率高升压DC-DC变换器。在传统Boost变换器的拓扑中融入开关电容结构与磁耦合升压技术,获得高电压增益,并降低开关管电压应力。拓扑的无源钳位结构有效解决了开关管电压尖峰过高的问题,提高了能量转换效率。详细研究了所提变换器工作原理后,对元件电流、电压应力以及变换器效率进行定量计算。于实验室搭建200 W样机验证所提变换器的可行性,实测变换器最大效率为97.5％。
Abstract
In order to solve the problem that the voltage grade of photovoltaic power generation and other new energy power generation technologies is low and cannot meet the requirement of grid-connected voltage, a two-winds high efficiency high step-up DC-DC converter applicable to new energy power generation system is presented. Based on the Boost converter, switched-capacitor structure and coupled-inductor technology are used to obtain high voltage gain and reduce the voltage stress of switch. The passive clamping structure can alleviate the problem about the high voltage peak of the switch and improve the energy conversion efficiency. This paper conducts detailed analysis about the operating principle of the proposed converter, and the current stress, voltage stress of components and efficiency of the converter are calculated precisely. An experimental prototype with a rated power of 200 W was built in the laboratory, and the experimental data shows that the maximum efficiency of the converter reaches 97.5％.
关键词
DC-DC变换器 /
耦合电路 /
增益调节 /
新能源发电 /
高效率 /
输入电流连续
Key words
DC-DC converter /
coupling circuit /
gain regulation /
new energy power generation /
high efficiency /
continuous input current
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基金
山东省自然科学基金面上项目（ZR2020ME200）; 山东省研究生教育优质课程建设项目（SDYKC20113）
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