准Z源逆变器耦合电感电流纹波抑制及电热分析

准Z源逆变器拥有一个独特的阻抗网络将电源和变换电路相耦合,并具有特殊的升降压功能.电感是其阻抗网络中的核心元件,在设备中占有较大比重,使用耦合电感能显著减小其尺寸和重量.本文提出了一种耦合电感的新型设计方案以减小准Z源逆变器的输入电流纹波,重点分析了耦合电感的损耗以及温升问题,给出了磁芯与绕组损耗以及热的解析表达式.基于Ansys有限元软件搭建了多物理域联合仿真模型以及搭建了一台6 kW的准Z源逆变器样机进行仿真与试验验证.

Current Ripple Suppression and Electro-thermal Analysis of the Coupled Inductor for the Quasi-Z Source Inverters

The quasi-Z source inverter (qZSI) has a unique impedance network that couples the power supply to the conversion circuit and has a special buck-boost function. Inductors are the core components of the impedance network, which occupy a large proportion of qZSI, and thus the size and weight of the two inductors can be significantly reduced by a coupled inductor design. In this paper, a novel design of coupled inductor is proposed to reduce the input current ripple of qZSI. Then, the loss of the coupled inductor and the temperature rise are analyzed. Moreover, the analytical expressions of the loss and temperature of the magnetic core and the winding are derived. A multiphysics model using the finite element software Ansys and a 6 kW qZSI prototype were built for simulation and verification.