In this study, a three-port DC–DC converter is proposed based on quadratic boost converter. The proposed converter contains paths to enable the flow of power from input source to load and battery. Furthermore, it makes a path available to energise the load by the battery. The proposed converter has a bidirectional path using two additional switches and two diodes. Power flows from the input source and the battery to the load in a single-stage resulting in higher efficiency. The proposed converter has three switches and two duty cycles defined. By adjusting the duty cycles, maximum input power and output voltage can be regulated based on the input source power and the battery condition. To control the proposed converter, three operation modes are defined. In order to design the control system, the proposed converter is analysed and the small-signal models are obtained. Using a decoupling network for the integrated small-signal models, separated closed-loop controllers are designed. Finally, a prototype for the proposed converter is prepared to validate feasibility and effectiveness of the proposed converter and the control method by experimental results.

中文翻译：

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基于二次升压转换器的三端口DC-DC转换器，用于独立的光伏/电池系统

在这项研究中，提出了一种基于二次升压转换器的三端口DC-DC转换器。拟议的转换器包含使功率从输入源流向负载和电池的路径。此外，它提供了一条路径来通过电池激励负载。所提出的转换器具有使用两个附加开关和两个二极管的双向路径。功率以单级从输入源和电池流向负载，从而提高了效率。提出的转换器具有三个开关和两个占空比。通过调整占空比，可以根据输入源功率和电池状况调节最大输入功率和输出电压。为了控制所提出的转换器，定义了三种工作模式。为了设计控制系统，对提出的转换器进行了分析，并获得了小信号模型。通过将去耦网络用于集成的小信号模型，可以设计分离的闭环控制器。最后，准备了所提出的转换器的原型，以通过实验结果验证所提出的转换器和控制方法的可行性和有效性。