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作为第三代半导体材料,SiC材料在禁带宽度、击穿场强、电子饱和速度、热导率等方面,比第一、二代半导体材料具有明显的优势。为了研究SiC二极管及混合功率模块在并网光伏逆变器中的应用优势,本文分析了其工作特性并开展了SiC二极管开关损耗及并网光伏逆变器转化效率的实验测试。结果表明,SiC二极管的开关损耗远低于Si二极管的,混合功率模块的恢复能耗大大降低,将其应用于并网光伏逆变器电路中可以有效提高并网光伏逆变器整机效率。
As the third generation of semiconductor materials, SiC materials have obvious advantages over the first and second generation semiconductor materials in terms of forbidden band width, breakdown field strength, electron saturation speed and thermal conductivity. In order to study the application advantages of SiC diodes and hybrid power modules in grid-connected photovoltaic inverters, this paper analyzed their operating characteristics and carried out experimental tests on the switching losses of SiC diodes and the conversion efficiency of grid-connected photovoltaic inverters. The results show that the switching loss of the SiC diode is much lower than that of the Si diode. The recovery power consumption of the hybrid power module is greatly reduced. Applying the same to the grid-connected photovoltaic inverter circuit can effectively improve the overall efficiency of the grid-connected photovoltaic inverter.