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

Vinay Rathore, K. Rajashekara, Anindya Ray, L. A. G. Rodriguez, Jacob A. Mueller
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引用次数: 2

Abstract

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.
用于BESS电网集成的电流馈电高增益多电平DC-DC变换器
提出了一种用于蓄电池储能系统(BESS)与配电网接口的新型高增益、多电平双向DC-DC变换器。所提出的拓扑结构在低压(LV) BESS侧采用电流馈电结构,在电池对电网模式运行期间获得高电压增益,而不需要大匝比隔离变压器。转换器的高压(HV)侧是一个由两个半桥电路组成的倍压网络,中间有一个双向开关,可以将两个桥重新配置为串联连接,以提高升压比。高压侧器件的移相调制保证了变压器泄漏电感电流的无缝换相。中间双向器件的调制占空比在电网侧直流链路上产生两倍于开关频率的多电平电压,这大大减小了滤波器的尺寸。所提出的调制策略保证了低压器件的零电流开关和高压器件的零电压开关,从而获得较高的功率转换效率。通过模态分析对该变换器的设计和运行进行了说明,并通过详细的仿真结果进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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