基于门极阻容补偿网络的IGBT串联均压方法

发布时间：2018-06-06 02:15

本文选题：IGBT串联 + 门极阻容网络　；参考：《电工技术学报》2017年04期

【摘要】：针对IGBT串联应用中关断过程均压问题,对IGBT的关断过程进行了详细分析,总结出影响IGBT关断过程的核心等效电路和计算公式。在此基础上提出一种基于门极补偿阻容网络的IGBT串联均压方法,推导出增加门极阻容补偿网络后串联IGBT动态电压不均衡度和关断时间影响的计算公式,并提出门极阻容网络参数的选取原则。建立基于Lumped Charge方法的IGBT半物理数值模型,对IGBT门极阻容补偿网络进行仿真验证。给出了实际测试工况下的补偿网络参数,建立IGBT串联均压实验系统,进行多种电压、电流工况下的实验验证。仿真和实验表明:该方法可以有效控制串联IGBT的延迟时间和动态电压上升速率的差异,在母线电压为2 000V和关断峰值电流为1 500A时,采用该控制方法可将串联IGBT的动态尖峰电压不均衡度由14.4%降至6.3%。
[Abstract]:Aiming at the problem of voltage equalization in IGBT series application, the turn-off process of IGBT is analyzed in detail, and the core equivalent circuit and calculation formula that affect the turn-off process of IGBT are summarized. On this basis, an IGBT series voltage equalization method based on gate compensated resistive and capacitive network is proposed, and the calculation formula of dynamic voltage imbalance and turn-off time of series IGBT after increasing gate resistive and capacitive compensation network is derived. The selection principle of gate pole resistive network parameters is also proposed. The half-physical numerical model of IGBT based on Lumped charge method is established, and the simulation of IGBT gate pole resistive compensation network is carried out. The compensation network parameters under the actual test conditions are given, and the IGBT series voltage sharing experimental system is established, which is verified by experiments under various voltage and current conditions. Simulation and experiments show that this method can effectively control the difference of delay time and dynamic voltage rise rate of series IGBT, when the bus voltage is 2 000 V and the off peak current is 1 500 A. Using this control method, the dynamic peak voltage imbalance of series IGBT can be reduced from 14.4% to 6.3%.
【作者单位】：西安许继电力电子技术有限公司;许继集团有限公司;
【分类号】：TN322.8

【相似文献】