Two-Stage Isolated Bidirectional DC–AC Converters With Three-Port Converters and Two DC Buses
Two-Stage Isolated Bidirectional DC–AC Converters With Three-Port Converters and Two DC Buses
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DOI：
10.1109/jestpe.2019.2936145
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发表时间：
2020-12
影响因子：
5.5
通讯作者：
Hongfei Wu;Yihang Jia;Fan Yang;Lei Zhu;Y. Xing
中科院分区：
文献类型：
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作者：
Hongfei Wu;Yihang Jia;Fan Yang;Lei Zhu;Y. Xing
提出了一种新颖的双直流母线两级结构，用于隔离式双向直流-交流功率变换。一个可变的直流环节电压加上恒定的直流环节电压的操作采用拟议的两级结构。根据直流侧电压的变化，自适应地调节其中一个直流侧电压，使DC-DC功率级始终工作在其最佳工作点。提出了新的三端口（TP）双向DC-DC转换器和TP双向逆变器/整流器（TP-BIR）的家庭来实现所提出的两级DC-AC功率转换结构。以TP-CLLC谐振变换器和T型TP-BIR构成的双向DC-AC变换器为例，验证了该结构的有效性。详细分析了TP-CLLC谐振变换器和T型TP-BIR变换器的工作原理。提出了TP-BIR的调制和控制策略，以实现两个直流母线之间的电压调节和功率分配。一个1.5千瓦的原型建立和测试，以验证所提出的解决方案的可行性和优势。
A novel two-stage structure with two dc buses is proposed for isolated bidirectional dc–ac power conversion. A variable dc-link voltage plus a constant dc-link voltage operation is adopted for the proposed two-stage structure. One of the dc-link voltages is regulated adaptively according to the variation of dc-side voltage, so that the dc–dc power stage can always work at its optimized point. New families of three-port (TP) bidirectional dc–dc converters and TP bidirectional inverter/rectifier (TP-BIR) are proposed to implement the proposed two-stage dc–ac power conversion structure. A bidirectional dc–ac converter composed of a TP-CLLC resonant converter and a T-type TP-BIR is taken as an example to verify the effectiveness of the proposed structure. Operation principles of both the TP-CLLC resonant converter and the T-type TP-BIR are analyzed in detail. Modulation and control strategies are proposed for the TP-BIR to achieve voltage regulation and power distribution between the two dc buses. A 1.5-kW prototype is built and tested to verify the feasibility and advantages of the proposed solution.