无漏电流高效可靠三电平双Buck并网逆变器

发布时间：2018-04-16 12:37

本文选题：并网逆变器 + 漏电流　；参考：《中国电机工程学报》2014年09期

【摘要】：漏电流降低了非隔离型并网逆变装置的安全性和可靠性。已有研究通过将双极性调制全桥逆变器或半桥逆变器三电平化解决该问题。提出基于三电平双Buck逆变器的新思路,并重点研究其中的三电平双Buck全桥电路。该拓扑是将双Buck半桥逆变器中的输入均压电容用一个工频开关的桥臂取代得到,使得对地寄生电容电压在半周期内保持不变,有效地抑制漏电流至几乎可以忽略的程度。同时,该拓扑保持了双Buck电路无桥臂直通、体二极管不工作等特点,又降低了器件电压应力,使得桥臂输出变为单极性调制波。通过与各种无漏电流结构的综合比较可知,该拓扑除在器件总量上比H5结构多一个功率管外,在有源器件数量、通态电流经过器件数量、高频开关器件数量、是否需要均压控制等方面,均有一定优势,有助于降低系统复杂度,提高可靠性与变换效率。仿真与实验验证了上述分析。
[Abstract]:Leakage current reduces the safety and reliability of the non-isolated grid-connected inverter.This problem has been solved by three-level bipolar modulation full-bridge inverter or half-bridge inverter.A new idea based on three level double Buck inverter is proposed, and the three level double Buck full bridge circuit is studied.The topology is obtained by replacing the input voltage equalizing capacitor in the double Buck half-bridge inverter with the bridge arm of a power frequency switch, which makes the parasitic capacitance voltage to the ground remain unchanged during the half-cycle, and effectively reduces the leakage current to a degree that is almost negligible.At the same time, the topology keeps the characteristics of double Buck circuit, such as no straight through of the bridge arm, no operation of the body diode, and reduces the voltage stress of the device, which makes the output of the bridge arm become a unipolar modulation wave.By comparing with various leakage free current structures, it can be seen that the topology has one more power transistor than H5 structure in the total device amount, the number of active devices, the number of on-state current passing through the devices, the number of high-frequency switching devices, and the number of high-frequency switching devices.It is helpful to reduce the complexity of the system and improve the reliability and conversion efficiency.The above analysis is verified by simulation and experiment.
【作者单位】：南京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(50907033) 江苏省科技支撑计划(BE2012170)~~
【分类号】：TM464

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