This study presents the cascaded variable structure control approach with respect to the non-minimum phase nature of the DC–DC Z-source converter (ZSC). The method is based on the sliding mode control technique for output voltage regulation. The control-to-output transfer function of the ZSC contains a right-half-plane (RHP) zero in continuous conduction mode. The RHP zero, obtained by a linearised small-signal model, results in frequency response limitation. In this case, the converter output voltage control should be studied regarding to the RHP zero effect. To alleviate this effect and enhance the dynamic performance, the cascaded sliding mode control method is proposed. The cascaded sliding mode controller guarantees asymptotically minimum phase stability as well as robustness against input voltage variation and load resistance uncertainty. The capability and effectiveness of the proposed control method are supported by experimental results.

中文翻译：

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使用级联滑模控制器缓解右半平面对Z源转换器输出电压调节的零影响

本研究针对DC-DC Z源转换器（ZSC）的非最小相位特性，提出了级联可变结构控制方法。该方法基于用于输出电压调节的滑模控制技术。ZSC的控制到输出传递函数在连续传导模式下包含一个右半平面（RHP）零。通过线性化小信号模型获得的RHP零会导致频率响应限制。在这种情况下，应针对RHP零效应研究转换器的输出电压控制。为了减轻这种影响并增强动态性能，提出了级联滑模控制方法。级联滑模控制器可确保渐近最小的相位稳定性以及针对输入电压变化和负载电阻不确定性的鲁棒性。