Analysis of a Multilevel Dual Active Bridge (ML-DAB)DC-DC Converter Using Symmetric Modulation

Electronics

C. L. Pechacek¹  H. Krishnaswami¹  M. A. Moonem¹  R. Hernandez¹ 

[1] The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA;

关键词: dual active bridge;    DC-DC multilevel converter;    neutral point clamped (NPC);    symmetric modulation;    soft-switching;   

DOI  :  10.3390/electronics4020239

来源: DOAJ

【 摘 要 】

Dual active bridge (DAB) converters have been popular in high voltage, low and medium power DC-DC applications, as well as an intermediate high frequency link in solid state transformers. In this paper, a multilevel DAB (ML-DAB) has been proposed in which two active bridges produce two-level (2L)-5L, 5L-2L and 3L-5L voltage waveforms across the high frequency transformer. The proposed ML-DAB has the advantage of being used in high step-up/down converters, which deal with higher voltages, as compared to conventional two-level DABs. A three-level neutral point diode clamped (NPC) topology has been used in the high voltage bridge, which enables the semiconductor switches to be operated within a higher voltage range without the need for cascaded bridges or multiple two-level DAB converters. A symmetric modulation scheme, based on the least number of angular parameters rather than the duty-ratio, has been proposed for a different combination of bridge voltages. This ML-DAB is also suitable for maximum power point tracking (MPPT) control in photovoltaic applications. Steady-state analysis of the converter with symmetricphase-shift modulation is presented and verified using simulation and hardware experiments.

【 授权许可】

Unknown