Modeling and Optimization of Bus-bar Local Stray Inductors in Converter

Abstract

Abstract Taking a two level inverter laminated bus as the research object, a mathematical model of local stray inductance is established. The ANSYS Q3D finite element simulation software is used to extract the self-inductance and mutual inductance of local stray inductances in laminated bus-bars. The equivalent local stray inductance is calculated according to the stray inductance mathematical model. The size and generation factors of the local stray inductance of the bus-bar are analysed, and the bus-bar structure is improved. By reducing the local stray inductance between the bus capacitors to IGBT module, the operational status of the converter circuits of the power converter is effectively improved. A double pulse test circuit is built to extract the local stray inductance of the bus-bar before and after optimization. The experimental results show that the improved bus-bar stray inductance is obviously reduced, the correctness of the theoretical analysis is verified, and it is helpful to optimize the bus-bar structure.