改进Z源逆变器的三次谐波注入控制策略

Third Harmonic Injection Control Strategy of Improved Z-Source Inverter

改进Z源逆变器与传统Z源逆变器相比具有Z源网络电容电压低、有内在的抑制启动冲击的能力等优点。但基于简单升压控制的改进Z源逆变器存在功率器件电压应力大以及Z源网络电感电流纹波大的缺陷。本文将三次谐波注入调制策略应用于改进Z源逆变器,与简单升压控制相比,能有效减小功率器件电压应力和Z网络电感电流脉动。对这两种调制策略应用于改进Z源逆变的综合性能进行了对比分析。在理论研究的基础上,通过仿真和实验验证了三次谐波注入调制策略的优点。

Compared to previous Z-source inverter topology, improved Z-source inverter has advantages such as low Z-source capacitor voltage stress and inherent inrush current limitation. This paper investigates the third harmonic injection control strategy of improved Z-source inverter. Compared to simple boost control, the third harmonic injection control can reduce the voltage stress and Z-source inductor current ripple. Theoretical analysis, simulation and experimental results are presented to demonstrate the features of the control.