Converters with impedance source networks combine their one-stage energy conversion with the function as buck and boost converters. Due to this fact, they are very attractive to the dc–ac applications. Many literatures have focused on the stress analysis and control enhancement of the impedance network in the dc side. For a better system design and control, the synthesis and interaction principle between the ac and dc side of the converters is required. This paper first presents small-signal modeling for the bidirectional quasi-Z-source converter by the circuit-averaging technique. Compared with previous modeling based on the shoot-through duty ratio, the modulation ratio is included for the ac-side analysis. It is revealed that the oscillation in the modulation ratio could be triggered by the ac current controller, due to the magnitude margin issue caused by the impedance network, and then instability in the impedance network can be observed, including the system input current. Based on the theoretical analysis, a design guideline for the ac current controller is provided. Experimental validation for both the model and analysis is demonstrated and the results are in good agreement with the theoretical analysis.

中文翻译：

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准Z源变换器交流电流控制器和阻抗网络的综合与设计

具有阻抗源网络的转换器将其一级能量转换与降压和升压转换器的功能相结合。因此，它们对 dc-ac 应用非常有吸引力。许多文献都集中在直流侧阻抗网络的应力分析和控制增强上。为了更好的系统设计和控制，转换器的交流和直流侧之间的综合和交互原理是必需的。本文首先介绍了通过电路平均技术对双向准 Z 源转换器进行小信号建模。与之前基于直通占空比的建模相比，交流侧分析包含调制比。结果表明，调制比的振荡可以由交流电流控制器触发，由于阻抗网络引起的幅度裕度问题，然后可以观察到阻抗网络的不稳定性，包括系统输入电流。在理论分析的基础上，提供了交流电流控制器的设计指南。证明了模型和分析的实验验证，结果与理论分析非常吻合。