Research on optimization method of stray inductance of converter bus bar based on structure

ZHU Yifeng, ZHENG Jingle

(School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China)

Abstract: Aiming at the problem of transient high voltage caused by the stray inductance of the stacked busbar when the power switch of the high power converter was turned off, the relationship between the stray inductance of the bus bar and its structure was studied. Through Q3D software, building the modeling of common simple structures of busbars of different sizes,openings,slots and extracting inductance extraction. The relationship between the busbar structure and the stray inductance was established by analyzing the current flow path in the busbar. A low sensitivity busbar structure optimization method based on improving the current flow path was proposed. By using this method, an active power filter busbar was designed optimally, and the stray inductance of the busbar before and after optimization was measured by double pulse method. The results show that the proposed method can significantly reduce the stray inductance of the busbar, and can effectively suppress the voltage impact caused by the instantaneous power switch off.

Key words: busbar; stray inductance; converter