This paper proposes a high-gain dc–dc converter with common ground utilizing a Z-source network for low voltage solar photovoltaic (PV) applications. This converter features a common ground and a high output–input voltage conversion factor at a low duty cycle. These converters find their most common application in grid-tied or stand-alone solar photovoltaic systems, particularly those with low output voltages that must be increased to the required level. The presented converter operating duty ratio is within 0–0.5 and maintains similar voltage stress on Z-network components since it employs the conventional Z-source configuration. The presented converter provides a common ground between source and load, unlike conventional Z-network converter. A type-2 closed-loop voltage controller and state–space average model evaluate the converter’s dynamic behavior for reliable and steady performance. A laboratory hardware prototype of 250 Watts is built and low gate signals are generated by using a ARM cortex M4 Microcontroller (STM32F407VGT6). The experimental results confirm that the proposed converter, with a gain of 10.46 and a power of 250 Watts, has a maximum efficiency of around 93%. The experimental results validates the effectiveness of the proposed converter under both constant and shifts in amounts of solar irradiation.

中文翻译：

---

适用于太阳能光伏应用的具有公共接地的高增益 Z 源升压 DC-DC 转换器

本文提出了一种采用 Z 源网络的共地高增益 DC-DC 转换器，用于低压太阳能光伏 (PV) 应用。该转换器具有公共接地和低占空比下的高输出输入电压转换系数。这些转换器最常见的应用是并网或独立太阳能光伏系统，特别是那些输出电压较低、必须提高到所需水平的系统。所提出的转换器工作占空比在 0-0.5 范围内，并且由于采用传统的 Z 源配置，因此在 Z 网络组件上保持类似的电压应力。与传统的 Z 网络转换器不同，所提出的转换器在电源和负载之间提供了公共接地。 2 型闭环电压控制器和状态空间平均模型可评估转换器的动态行为，以实现可靠且稳定的性能。构建了 250 瓦的实验室硬件原型，并使用 ARM Cortex M4 微控制器 (STM32F407VGT6) 生成低栅极信号。实验结果证实，所提出的转换器增益为 10.46，功率为 250 瓦，最高效率约为 93%。实验结果验证了所提出的转换器在太阳辐射量恒定和变化的情况下的有效性。