为使光伏、燃料电池等新能源发电系统输出稳定的高直流电压,提出一种双开关准Z源耦合电感高增益非隔离型DC/DC变换器。该变换器在传统准Z源结构基础上增加一个开关管和二极管组成双开关准Z源结构,利用耦合电感和开关电容单元实现变换器在更低占空比下的高电压增益,具备高电压增益、输入电流连续、开关管和二极管电压应力低、输入输出共地的优点。详细分析变换器拓扑的工作原理、稳态性能以及参数设计,并与其他相关的准Z源结构的DC/DC变换器进行对比。最后搭建一个120 W的实验样机,实验结果验证了理论分析的正确性与可行性。
Abstract
A high gain quasi-Z-source DC/DC converter with double-switch and coupled inductor is proposed to output high DC voltage stably in photovoltaic, fuel cell and other new energy power generation systems. Based on traditional quasi-Z-source structure, an extra switching tube and diode are added. Coupled inductance and switching capacitance unit are used to achieve high voltage gain at lower duty cycle. The converter possesses numerous advantages, including a high voltage gain, continuous input current, reduced voltage stress on switching tubes and diodes, and common input and output. The operating principle, steady-state performance and parameter design of the converter are analyzed in detail, and compared with other quasi-Z-source high-gain DC/DC converters. Ultimately, a prototype delivering 120 W is constructed to demonstrate the validity of the theoretical analysis.
关键词
DC/DC变换器 /
拓扑 /
耦合电路 /
光伏发电 /
高增益 /
准Z源
Key words
DC/DC converters /
topology /
coupling circuit /
photovoltaic power /
high gain /
quasi-Z-source
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基金
国家自然科学基金（61374153; 52377209）; 江苏省研究生科研与实践创新计划（SJCX23_0133）
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