低感设计对变流器电容纹波电流影响分析与优化

在大功率变流器产品的设计应用过程中，因母排杂散电感的不匹配导致变流器模块支撑电容纹波电流有效值偏大，电容长期工作在超额状态以致损坏。针对上述问题，根据变流器模块不同母排结构建立相对应的数学模型，分析了支撑电容电流偏大的根本原因。通过试验的方法测量提取不同母排结构的杂散电感以指导后续母排的设计。根据理论分析提出了通过优化母排设计、改善控制算法来减小母线支撑电容纹波电流。最后，基于某一变流器平台，通过测量不同试验条件下电容电流纹波，对比分析试验数据以验证所提改进措施的有效性。

Analysis and Optimization of Influence of Low Inductance Design on Capacitor Ripple Current of Converter

In the design and application of the high power converter products, the root mean square (RMS) ripple current of the support capacitor of the converter module is too large, resulting from the mismatch of stray inductance of the busbar, and the capacitor works in excess state for a long time, resulting in damage. In view of the above problems, the corresponding mathematical model according to the different busbar structures of the converter module is established, and the root cause of the large support capacitor current is analyzed. The stray inductors of different busbar structures are measured and extracted by experiments to guide the design of subsequent busbar. According to the theoretical analysis, it is proposed to reduce the ripple current of bus support capacitor by optimizing the bus bar design and improving the control algorithm. Finally, based on a converter platform, the capacitive current ripple under different experimental conditions is measured, and the experimental data are compared and analyzed to verify the effectiveness of the proposed improved measures.