A Coupled-Inductor-Based Buck–Boost AC–DC Converter With Balanced DC Output Voltages
A Coupled-Inductor-Based Buck–Boost AC–DC Converter With Balanced DC Output Voltages
复制标题
DOI：
10.1109/tpel.2018.2820173
复制
发表时间：
2019-01
影响因子：
6.7
通讯作者：
Houqing Wang;Weimin Wu;Y. Li;F. Blaabjerg
中科院分区：
文献类型：
--
作者：
Houqing Wang;Weimin Wu;Y. Li;F. Blaabjerg
随着分布式发电电源的发展和直流特性负载的广泛应用，直流纳米栅越来越受到人们的关注，三端输出变换器的研究也越来越多。考虑到成本、效率以及安全性，在设计用于直流纳米网格系统的交流-直流转换器时需要解决接地配置。提出了一种三端输出的交流-直流变换器，用于基于直流纳米栅的联合接地结构。然而，对于这种类型的转换器，在不相等的直流负载的情况下，输出电压是不平衡的。提出了一种新型的利用耦合电感实现输出电压自平衡的buck-boost ac-dc变换器。通过对等效电路的分析，详细介绍了该变换器的工作原理。给出了系统在不同工作模式下的小信号模型，整个系统控制图展示了如何平衡直流输出电压。研制了220 V/50 Hz/1.5 kW样机。实验验证了耦合电感变换器的有效性。
With the development of distributed power generation sources and the widely used dc characterized loads, the dc nanogrid becomes more and more attractive and the converters with three terminal outputs are increasingly studied. Considering the costs, the efficiency, and also the safety, the grounding configuration needs to be addressed when designing the ac–dc converter for a dc nanogrid system. An ac–dc converter with three terminal outputs has been presented for the united grounding configuration based dc nanogrid. Nevertheless, for this type of converters, the output voltages are unbalanced in case of unequal dc loads. This paper proposes a novel buck–boost ac–dc converter with the capacity of output voltages self-balancing by using a coupled inductor. The operation of this converter will be presented in details through analyzing its equivalent circuits. The small signal model of the system in different working modes is given, and the whole system control diagram shows how to balance the dc output voltages. A 220 V/50 Hz/1.5 kW prototype has been developed. Experiments are carried out to verify the effectiveness of the coupled-inductor-based converter.