ABSTRACT

Solid-state transformer has been a major area of research in recent years because of its multifunctionality as compared to conventional low-frequency transformers. Bidirectional isolated dual-active bridge is an important component in power electronic transformer. When conventional control scheme such as single-phase shift and dual-phase shift are used, they have high current stress and thus reducing the system efficiency because of high circulating power. Furthermore, they have high $dv/dt$ across switches, with only one or two degrees of freedom. It confines its ability to regulate power flow. In this paper, a new T-type dual-active bridge with symmetrical configuration is proposed, having five degrees of freedom which not only improves its ability to regulate power flow, but also reduces $dv/dt$ across switches due to increase in voltage levels, and has lesser current stress. It reduces the circulating power which improves the efficiency of system. Detailed analysis to establish the relation between controllable variables with current and power flow is given in this paper. Performance of the proposed converter has been verified via simulation and experimental results.

摘要

固态变压器因其与传统低频变压器相比的多功能性而成为近年来的主要研究领域。双向隔离双有源电桥是电力电子变压器中的重要元件。当使用单相移和双相移等传统控制方案时，它们具有高电流应力，从而由于高循环功率而降低系统效率。此外，它们具有高$dv/d吨$跨开关，只有一两个自由度。它限制了其调节功率流的能力。本文提出了一种具有五个自由度的对称配置的新型 T 型双有源桥，不仅提高了其调节潮流的能力，而且降低了$dv/d吨$由于电压电平的增加而跨开关，并且具有较小的电流应力。减少循环功率，提高系统效率。本文给出了建立可控变量与电流和潮流之间关系的详细分析。所提出的转换器的性能已通过仿真和实验结果得到验证。