二极管箝位型三电平变换器关断尖峰电压吸收电路分析  

Analysis on Methods for Suppressing Turn off Peak Voltage of Diode Clamped Three level Converter

作　　者：尚扬 王永生 魏超 黄海宏[2] SHANG Yang;WANG Yongsheng;WEI Chao;HUANG Haihong(State Grid Lu’an Electric Power Supply Company,Lu’an 237000,China;School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]国网安徽省电力公司六安供电公司,安徽六安237000 [2]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电器与能效管理技术》2023年第11期23-27,34,共6页Electrical & Energy Management Technology

摘　　要：详细分析了二极管箝位型三电平变换器中功率器件关断尖峰电压产生的原因,探讨了工程上抑制关断尖峰电压的各种方法,并重点分析了常用的尖峰电压吸收电路使用注意事项。结果表明,传统的RCD电压尖峰吸收电路应用在三电平电路中,存在状态转换时若死区时间不足会产生瞬时短路电流的问题,对功率电路造成威胁,采用简化的RC吸收电路较为合适。最后通过仿真对上述分析进行了验证。The causes of the turn off peak voltage of power devices in diode clamped three-level converters is analyzed.The various methods of suppressing the turn off peak voltage in engineering is discussed.Then,the matters needing attention in the use of commonly used peak voltage absorbing circuits is emphatically analyzed.The analysis results show that when the traditional RCD voltage peak absorption circuit is applied to three-level circuits,there is a problem of generated instantaneous short circuit currents if the dead time is insufficient during state transition,which poses a threat to the power circuit.Therefore,it is more appropriate to use a simplified RC absorption circuit.Finally,the above analysis is verified by simulation.

关 键 词：三电平变换器 关断尖峰电压 分布电感 RC缓冲电路 

分 类 号：TM46[电气工程—电器]