具有对称辅助电路的谐振直流环节三电平软开关逆变器

发布时间：2018-06-05 20:40

本文选题：谐振 + 三电平　；参考：《中国电机工程学报》2014年27期

【摘要】：为了降低三电平逆变器在高开关频率下的开关损耗,提高其效率,提出一种具有对称辅助电路的谐振直流环节三电平软开关逆变器的拓扑结构,通过在三电平硬开关逆变器的直流环节设置对称辅助谐振电路,利用辅助电路的谐振将直流母线之间谐振电容的端电压周期性下降到零,使三电平逆变器的主开关在直流母线之间的谐振电容端电压为零时完成切换,以实现零电压开关。文中依据不同工作模式下的等效电路图,详细分析该软开关逆变器的工作过程。制作3?kW的谐振直流环节三相三电平软开关逆变器的样机,实验结果表明,逆变器的主开关和辅助开关都实现了软开关切换,效率相比于三电平硬开关逆变器有明显提高。因此所提出的拓扑结构可有效降低三电平逆变器的开关损耗,具有工程实用性。
[Abstract]:In order to reduce the switching loss of three-level inverter at high switching frequency and improve its efficiency, a kind of resonant DC link three-level soft-switching inverter with symmetric auxiliary circuit is proposed. By setting the symmetrical auxiliary resonant circuit in the DC link of the three-level hard-switching inverter, the terminal voltage of the resonant capacitor between the DC busbar is periodically reduced to zero by using the resonance of the auxiliary circuit. The resonant capacitor voltage of the main switch of the three-level inverter is 00:00 between the DC busbar to realize the zero-voltage switch. According to the equivalent circuit diagram of different working modes, the working process of the soft-switching inverter is analyzed in detail. The prototype of three-phase three-level soft-switching inverter with resonant DC link of 3?kW is made. The experimental results show that both the main switch and auxiliary switch of the inverter achieve soft-switching, and the efficiency of the inverter is much higher than that of the three-level hard-switching inverter. Therefore, the proposed topology can effectively reduce the switching loss of the three-level inverter and has engineering practicability.
【作者单位】：辽宁石油化工大学信息与控制工程学院;江苏省新能源发电与电能变换重点实验室(南京航空航天大学);
【基金】：国家自然科学基金项目(51207069) 中国博士后科学基金项目(2013M531349) 辽宁省教育厅科研项目(L2013146) 江苏省博士后科研资助计划项目(1301105C)~~
【分类号】：TM464

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