The output voltage of renewable energy sources is influenced by environmental conditions. To compensate for the variations of voltage, a buck–boost power conditioning system can be used. This article presents a full-bridge single-inductor-based buck–boost inverter. Its output voltage can be greater or lower than the input voltage depending on the controllable duty ratio. This inverter features bidirectional and reactive power flow operations with no high-frequency common-mode voltage. The unique feature of the proposed inverter is using a single inductor in the power train, which enhances the power density. Moreover, only two switches can operate at high frequency. This enables the inverter to be made with the high efficiency and simple circuit configuration. Based on the proposed full-bridge inverter, a novel cascaded buck–boost inverter is also presented. It retains all the benefits of the proposed full-bridge inverter. The theoretical analysis of the proposed full-bridge inverter is first explained in detail. It is then extended to a cascaded inverter. Thereafter, the practical effectiveness of the proposed inverters is verified with the experimental tests by implementing the hardware prototypes of 110 V_rms, 60 Hz, and 500 W for full-bridge single-inductor-based buck–boost inverter, and 220 V_rms, 60 Hz, and 1000 W for the cascaded inverter.

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基于全桥单电感器的降压-升压逆变器

可再生能源的输出电压受环境条件的影响。为了补偿电压的变化，可以使用降压-升压电源调节系统。本文介绍了一种基于全桥单电感器的降压-升压逆变器。根据可控占空比，其输出电压可以高于或低于输入电压。该逆变器具有双向和无功潮流操作，无高频共模电压。所提出的逆变器的独特之处在于在动力系统中使用单个电感器，从而提高了功率密度。此外，只有两个开关可以在高频下工作。这使得逆变器能够以高效率和简单的电路配置制造。基于所提出的全桥逆变器，还介绍了一种新颖的级联降压-升压逆变器。它保留了建议的全桥逆变器的所有优点。首先详细解释所提出的全桥逆变器的理论分析。然后将其扩展为级联逆变器。此后，通过实现 110 V 的硬件原型，通过实验测试验证了所提出的逆变器的实际有效性_rms、60 Hz 和 500 W 用于基于全桥单电感器的降压-升压逆变器，220 V _rms、60 Hz 和 1000 W 用于级联逆变器。