A soft-switched nonisolated multiport bidirectional converter is proposed for hybrid energy system applications. The proposed topology improves the efficiency and expands the applications of the conventional three-port converter (TPC) by adding a soft-switching cell and a bidirectional power flow path from output to charge the energy storage device. Moreover, soft-switching conditions for all TPC switches in all operating modes are achieved. The topology uses one inductor that is shared by all power flow paths. Thus, power conversion in all operating modes is done in a single-stage and the conduction loss is reduced. To implement the soft-switching cell, coupled inductors are used to optimize the magnetic core and volume of the converter. Various converter operating modes are presented, and design considerations are discussed. Moreover, different control system operating modes are explained and designed in detail. Finally, a converter prototype to supply a 250 W–200 V load is implemented, and the theoretical analysis is validated by the experimental results.

中文翻译：

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用于混合能源系统的软开关单电感器单级多端口双向电源转换器

一种软开关非隔离多端口双向转换器被提议用于混合能源系统应用。所提出的拓扑通过添加软开关单元和从输出到为能量存储设备充电的双向功率流路径，提高了效率并扩展了传统三端口转换器 (TPC) 的应用。此外，实现了所有操作模式下所有 TPC 开关的软开关条件。该拓扑使用一个电感器，所有功率流路径都共享该电感器。因此，所有工作模式下的功率转换都是在单级中完成的，从而降低了传导损耗。为了实现软开关单元，使用耦合电感器来优化转换器的磁芯和体积。介绍了各种转换器工作模式，并讨论了设计注意事项。而且，详细解释和设计了不同的控制系统操作模式。最后，实现了提供 250 W–200 V 负载的转换器原型，并通过实验结果验证了理论分析。