Generalized Architecture of a GaN-Based Modular Multiport Multilevel Flying Capacitor Converter
Generalized Architecture of a GaN-Based Modular Multiport Multilevel Flying Capacitor Converter
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DOI：
10.1109/tpel.2023.3269800
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发表时间：
2023-08
影响因子：
6.7
通讯作者：
M. Elrais;Md. Safayatullah;I. Batarseh
中科院分区：
文献类型：
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作者：
M. Elrais;Md. Safayatullah;I. Batarseh
提出了一种基于通用氮化镓（GaN）的模块化多端口多电平飞行电容器结构。换句话说，采用吸引飞电容多电平（FCML）设计和全桥展开电路来开发适合各种应用的多端口多电平变换器体系结构。每个模块都可以设计成包含交流和直流端口的任意组合，通过DC- DC和DC- AC电源转换路径连接。这些转换路径是FCML拓扑结构，可以设计成任意数量的级别；直流到交流路径包含全桥展开电路。三个端口和四个端口开环控制的两个示例原型验证了这种通用架构。具有两个直流端口和一个交流端口的单模块3 kw三端口四电平原型实现了11.6英寸（4.8英寸× 4.3英寸× 0.56英寸）的紧凑尺寸和258.6 W/in3的高功率密度。这三个端口通过dc - ac和dc - dc路径连接，分别达到了98.2%和99.43%的峰值效率。交流端口电压和电流的总谐波畸变分别为1.26%和1.23%。由于GaN开关，它工作在120 kHz的高开关频率下，并且由于FCML的频率倍增效应，它的实际频率（电感的纹波频率）为360 kHz。四端口原型包含三个直流端口和一个交流端口，并取得了类似的高数字的优点。本文介绍了两种高效率、功率密度高、尺寸小的原型机的实验结果，并强调了该体系结构的潜力。模块数量、端口和级别的选择取决于应用程序及其规格；因此，这种提出的广义结构可以作为各种感兴趣的应用的参考设计方法。
This article proposes a generalized gallium nitride (GaN)–based modular multiport multilevel flying capacitor architecture. In other words, the attractive flying capacitor multilevel (FCML) design and the full-bridge unfolding circuit are employed to develop a multiport multilevel converter architecture that fits various applications. Each module can be designed to contain any combination of AC and DC ports connected through DC-to-DC and DC-to-AC power conversion paths. These conversion paths are FCML topologies that can be designed with any number of levels; the DC-to-AC paths incorporate the full-bridge unfolding circuit. Two example prototypes with open-loop control, three-port and four-port, have verified this generalized architecture. A single-module 3-kW three-port four-level prototype with two DC ports and an AC port has achieved a compact size of 11.6 in3 (4.8 in × 4.3 in × 0.56 in) and a high power density of 258.6 W/in3. The three ports are connected through DC-to-AC and DC-to-DC paths that have achieved peak efficiencies of 98.2% and 99.43%, respectively. The total harmonic distortion of the AC port's voltage and current are 1.26% and 1.23%, respectively. It operates at a high switching frequency of 120 kHz because of the GaN switches and has an actual frequency (inductor's ripple frequency) of 360 kHz thanks to the frequency multiplication effect of the FCML. The four-port prototype contains three dc ports and an AC port and achieved similar high figures of merit. These experimental results of the two prototypes of high efficiency, power density, and compact size are presented in this article and highlight this architecture's promising potential. The choice of the number of modules, ports, and levels depends on the application and its specification; therefore, this proposed generalized structure may serve as a reference design approach for various applications of interest.