针对现有的技术缺陷,提出一种高电压增益的单级逆变电路,利用直流侧改良倍压单元和逆变侧直通状态,实现交流输出电压受耦合绕组匝数比和直通占空比的双自由度调节,在小直通占空比时能够获得高升压比。分析新拓扑的工作模态、各元件之间的电压和电流关系以及比较三相桥式逆变器总开关功率。在此基础上,分析寄生参数条件下逆变器升压比与效率之间的关系。最后,搭建850 W实验样机进行验证,实验结果与理论分析和仿真结果一致,验证所提逆变器的正确性和可行性。
Abstract
Aiming at the existing technical defects, this paper proposed a high-boost single-stage inverter（VMC-qZSI）, which uses voltage multiplier units of DC-link and shoot-through state of inverter-link to realize dual degree of freedom adjustment of the AC output voltage by the coupled-inductor turns ratio n and shoot-through duty cycle D. A high voltage gain can be obtained when the D is small. The working mode of the new toplogy, voltage and current relationship between each component, and the comparison of the total switching power of three phase bridge type inverters are, described. On this basis, the relationship between the boost ratio and the efficiency of the inverter under the parasitic conditions is deduced. An 850 W prototype was built in the laboratory to verify the validity of the proposed inverter. Experimental results prove the validity and feasibility of the proposed inverters.
关键词
光伏 /
逆变器 /
效率 /
准Z源 /
拓扑 /
高电压增益
Key words
photovoltaic /
inverters /
efficiency /
quasi-Z-source /
topology /
high gain
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