A wide variety of AC/DC power converter topologies have been developed in order to improve the system efficiency, input power factor and system redundancy for stationary battery energy storage systems. Due to the nature of high-power batteries, there is a big voltage difference between battery terminals from the end of discharge to the high charge value. To prevent unregulated battery voltages from harming the system loads, several techniques are used in the industry. A well-known old technique named as diode dropper is simple but suffers from low efficiency. Using a DC-DC converter is more advantageous, although it increases the cost. In this paper, the use of partial power processing converters which attract interest these days has been proposed as an alternative. The proposed full bridge/push-pull series connected partial power converter has a slight modification compared to the classical one presented in the literature. A system with 22 kW power rating was designed and tested. In order to compare the results, a two-switch buck-boost converter was also designed and tested for the same conditions. The results show that the proposed converter is superior to both the two-switch buck-boost converter and other topologies in terms of efficiency and response speed. Efficiencies of 97%–99% have been attained with the proposed converter.

中文翻译：

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带充电器的固定式电池储能系统22kW全桥推挽串联部分功率变换器的设计与实现

为了提高固定电池储能系统的系统效率、输入功率因数和系统冗余，已经开发了多种 AC/DC 电源转换器拓扑。由于大功率电池的特性，从放电结束到高充电值，电池端子之间存在较大的电压差。为了防止未调节的电池电压损害系统负载，业界使用了多种技术。一种称为二极管降压器的众所周知的旧技术很简单，但效率低下。使用 DC-DC 转换器更有优势，但会增加成本。在本文中，已提出使用近来引起人们兴趣的部分功率处理转换器作为替代方案。与文献中提出的经典转换器相比，所提出的全桥/推挽串联部分电源转换器略有修改。设计并测试了一个额定功率为 22 kW 的系统。为了比较结果，还针对相同条件设计并测试了一个双开关降压-升压转换器。结果表明，所提出的转换器在效率和响应速度方面均优于双开关降压-升压转换器和其他拓扑结构。使用建议的转换器已达到 97%–99% 的效率。结果表明，所提出的转换器在效率和响应速度方面均优于双开关降压-升压转换器和其他拓扑结构。使用建议的转换器已达到 97%–99% 的效率。结果表明，所提出的转换器在效率和响应速度方面均优于双开关降压-升压转换器和其他拓扑结构。使用建议的转换器已达到 97%–99% 的效率。