在光伏发电系统中,为实现高增益直流母线电压并网需求,提出一种新型高升压耦合电感DC-DC变换器。通过耦合电感匝比和开关占空比双重调节,提升变换器的高升压能力。利用无源钳位回路对开关器件实现电压钳制,通过耦合电感的漏感吸收开关器件开关瞬间的电流脉冲,有效减小开关器件开关损耗和脉冲冲击,提高了变换器使用寿命。开关管电压应力低、本征占空比小,开关损耗小,有利于提升变换器效率。对变换器工作原理和具体模态进行分析,推演了各器件应力和选型依据。结合仿真和实验对比,验证了新型高升压耦合电感DC-DC变换器的理论正确性。
Abstract
A novel high-boost coupled inductor DC-DC converter is proposed to meet the requirement of high gain DC bus voltage grid-connection in photovoltaic power generation system. The high voltage boost capability of the converter is improved by double adjustment of the coupling inductor turn ratio and switch duty ratio. The active clamping circuit is used to clamp the voltage of the switching device, and the leakage inductance of the coupling inductor is used to absorb the instantaneous current pulse of the switching device, which can effectively reduce the switching loss and pulse impact of the switching device, and prolong the service life of the converter. The switching tube voltage stress is low, the duty cycle is small, the switching loss is small, which is beneficial to improve the efficiency of the converter. The working principle and specific modes of the converter are analyzed, and the stress and selection basis of each device are deduced. The theoretical correctness of the novel DC-DC converter with high boost coupling inductor is verified by simulation and experimental comparison.
关键词
光伏发电 /
增益调节 /
耦合电路 /
DC-DC变换器 /
钳位回路
Key words
PV powewr /
gain regulation /
coupling circuit /
DC-DC converter /
clamping circuit
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参考文献
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基金
山东省自然科技基金面上项目（ZR2020ME200）; 山东省研究生教育优质课程建设项目（SDYKC20113）
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