三电平变换器无感母排设计

Non-inductive Busbar Design for Three-level Converter

为了抑制大功率三电平变换器关断过电压的产生,从减小连接线路杂散电感出发,对无感叠层母排结构合理设计。首先,根据三电平变换器的拓扑结构和工作原理,阐述产生尖峰电压的四种强迫换流回路。然后,基于电磁场理论,提出回路面积最小化的无感母排设计原则,并应用到三电平防爆变换器中。实验结果表明,所用无感母排设计方法合理,有效抑制器件关断过电压,提高系统工作可靠性。

In order to suppress the generation of shutoff overvoltage in three-level converter, this paper designs a structure of non-inductive laminated busbar reasonably according to reducing stray inductance in connection circuit. First of all, based on the topology and working principle of three-level converter, four forced commutation circuits generating peaking voltage are analyzed. Then, under the electromagnetic field theory, basic principles of a non-inductive busbar structure are proposed by minimizing loop area. These principles are applied to the three-level explosion-proof converter. The experimental results show that the design method of laminated busbar is reasonable, and can effectively suppress shutoff overvoltage of power devices, which provides design ideas and reference value for application of laminated busbar.