基于GaN器件的双Buck逆变器共模与损耗

发布时间：2019-03-16 16:57

【摘要】：目前市场上的光伏并网逆变器结构按隔离方式来分,可分为隔离型和非隔离型,而抑制或消除共模电流是非隔离型光伏并网系统必须要解决的问题。出于在非隔离型光伏并网逆变器中抑制共模电流的目的,研制一种基于GaN器件的双Buck逆变器,该逆变器较传统全桥电路,共模电流小、效率高、控制简单。针对共模特性进行分析研究,分别对其在正常工况与死区状态的共模电流进行理论分析,并进行仿真与实验验证,得出该逆变器能够很好地抑制共模电流的结论。通过引入GaN器件来提高开关频率解决拓扑自身电感较大这一问题,并基于GaN器件对电路进行损耗分析与实验验证,实验结果与理论分析基本吻合,验证了损耗分析的正确性。该逆变器的实测最高效率高达98.63%。
[Abstract]:At present, photovoltaic grid-connected inverters in the market are divided into isolated and non-isolated inverters, and the suppression or elimination of common-mode current is a problem that must be solved in non-isolated photovoltaic grid-connected systems. In order to suppress common-mode current in non-isolated photovoltaic grid-connected inverter, a dual-Buck inverter based on GaN device is developed. Compared with the traditional full-bridge circuit, the inverter has the advantages of low common-mode current, high efficiency and simple control. Based on the analysis of common-mode characteristics, the common-mode current in normal condition and dead-zone state is analyzed theoretically, and the simulation and experimental results show that the inverter can restrain the common-mode current very well. The GaN device is introduced to improve the switching frequency to solve the problem of the large inductance of the topology itself. The loss analysis and experimental verification of the circuit based on the GaN device are carried out. The experimental results are basically in agreement with the theoretical analysis, and the correctness of the loss analysis is verified. The measured maximum efficiency of the inverter is 98.63%.
【作者单位】：北京交通大学电气工程学院;
【基金】：国家重点研发计划资助项目(2017YFB0402904)
【分类号】：TM464

【相似文献】