SVPWM控制时双向Z源逆变器电容电压纹波分析

Z源逆变器在SPWM简单控制时的电容电压纹波在整个负载周期内是恒定的,而在SVPWM控制下,电压纹波会随着电压矢量相位变化而变化,故电压纹波的求解更为复杂。本文的研究证明,Z源电感取值较大,电容的电压纹波与电感值无关。但是,如果电感取值较小,那么电压纹波与电感值是相关的。分析了双向Z源逆变器在SVPWM策略下的关键电感值和电容电压纹波,仿真和实验结果验证了理论分析的正确性。

Analysis of Capacitor Voltage Ripple for Bi-Directional Z-Source Inverters Based on SVPWM

With simple SPWM strategy, the capacitor voltage ripple of Z-source inverters keeps constant. However, the voltage ripple is related to the phase angle of reference vector under SVPWM, so its derivation is complex. It is considered if the inductance of Z-source is large the capacitor voltage ripple is traditionally independent of the inductance, while if it is small, the capacitor voltage is related to the inductance. The critical inductance and capacitor voltage ripple are also derived in this paper. Simulations and experimental results have verified these theoretical findings.