A Current-fed High Gain Multilevel DC-DC Converter for BESS Grid Integration Applications

被引:2
|
作者
Rathore, Vinay [1 ]
Rajashekara, Kaushik [1 ]
Ray, Anindya [2 ]
Rodriguez, Luciano A. Garcia [2 ]
Mueller, Jacob [2 ]
机构
[1] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77004 USA
[2] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA
关键词
Bidirectional DC-DC converter; current-fed topology; power electronic interface; multilevel converter; BESS; renewable energy; DC/DC CONVERTER; ENERGY-STORAGE;
D O I
10.1109/APEC42165.2021.9487339
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
This paper presents a new high gain, multilevel, bidirectional DC-DC converter for interfacing battery energy storage systems (BESS) with the distribution grid. The proposed topology employs a current-fed structure on the low-voltage (LV) BESS side to obtain high voltage gain during battery-to-grid mode of operation without requiring a large turns ratio isolation transformer. The high-voltage (HV) side of the converter is a voltage-doubler network comprising two half-bridge circuits with an intermediary bidirectional switch that re-configures the two bridges in series connection to enhance the boost ratio. A seamless commutation of the transformer leakage inductor current is ensured by the phase-shift modulation of HV side devices. The modulating duty cycle of the intermediary bidirectional devices generates a multilevel voltage of twice the switching frequency at the grid-side dc link, which significantly reduces the filter size. The presented modulation strategy ensures zero current switching (ZCS) of the LV devices and zero voltage switching (ZVS) of the HV devices to achieve a high power conversion efficiency. Design and operation of the proposed converter is explained with modal analysis, and further verified by detailed simulation results.
引用
收藏
页码:1964 / 1970
页数:7
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