实现输入电流连续的优化型Y源逆变器

Optimized Y-source inverter for continuous input current

传统Y源逆变器输入电流断续,同时耦合电感漏感会导致直流母线电压尖峰和电压增益的降低。为此提出了一种优化型Y源逆变器,能够实现连续的输入电流并抑制耦合电感漏感对逆变器性能的影响,降低了启动冲击电流,减小了母线电压尖峰和磁芯的尺寸。相比传统Y源逆变器,在相同的电压增益下,优化型Y源逆变器的直通占空比更低,从而增大了调制比范围,提高了输出电压波形质量。使用解析计算方法详细分析了耦合电感漏感引起的逆变器直通占空比丢失问题。最后,通过与传统Y源逆变器进行仿真和实验比较,验证了优化型Y源逆变器的优越性。

The input current of the traditional Y-source inverter is discontinuous,and the leakage inductance of the coupled inductor will cause the DC bus voltage spike and the voltage gain reduction.To address above issues,an optimized Y-source inverter is proposed,which can achieve continuous input current and suppress the impact of the leakage inductance of the coupled inductor on the inverter performance,and reduce the starting inrush current,the bus voltage spike and the magnetic core size.Moreover,compared with the traditional Y-source inverter,it applies lower shoot-through duty ratio when considering same voltage gain,which expends the modulation ratio range and improves the quality of the output voltage waveform.Besides,an analytical calculation method is adopted to thoroughly analyze the loss problem of the inverter shoot-through duty ratio caused by the leakage inductance of the coupled inductor.Finally,compared with the traditional Y-source inverters,the superiority of the optimized Y-source inverter is verified by simulation and experiment.