In this article, we investigate power-decoupling methods used in single-phase Z-source/quasi-Z-source inverters (ZSIs/qZSIs) to handle inherent double-linefrequency (2ω) power by comparing their implementation approaches and performances. Passive methods can be used to suppress 2ω ripples within the range of engineering tolerance by designing impedance networks, modifying modulation methods, or using closed-loop damping controls. Active power-decoupling methods eliminate 2ω ripples from the dc side by employing an active filter that buffers the 2ω ripple power. After we address the pros and cons of all methods, we apply a typical active method to a single-phase qZSI and a single-phase qZS matrix converter to demonstrate their high performance, promising perspectives, and potential applications.

中文翻译：

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单相 Z 源\/准 Z 源逆变器和转换器：双线频电源去耦方法和前景概述

在本文中，我们通过比较实现方法和性能来研究单相 Z 源/准 Z 源逆变器 (ZSI/qZSI) 中用于处理固有双线频率 (2ω) 功率的功率去耦方法。通过设计阻抗网络、修改调制方法或使用闭环阻尼控制，可以使用无源方法将2ω纹波抑制在工程容差范围内。有源功率去耦方法通过使用缓冲 2ω 纹波功率的有源滤波器来消除直流侧的 2ω 纹波。在我们解决了所有方法的优缺点之后，我们将典型的有源方法应用于单相 qZSI 和单相 qZS 矩阵转换器，以展示它们的高性能、前景和潜在应用。