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Experimental discussions on operating frequencies of a bidirectional isolated DC-DC converter for a battery energy storage system

机译:电池储能系统双向隔离式DC-DC转换器工作频率的实验讨论

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This paper presents a high-efficiency bidirectional isolated dc-dc converter for a battery energy storage system connected to the grid. It discusses the design of the converter, an optimal operating frequency range, and the optimal dead times for a 6-kW, full-bridge, bidirectional isolated dc-dc converter with focus on improving converter efficiency. This paper also provides a power-loss breakdown of the dc-dc converter at the rated power. The optimal frequency range of the dc-dc converter is defined by making its frequency-dependent loss equal to its frequency-independent loss. The optimal dead time is defined by one-fourth of the resonant period. The maximum efficiency of the dc-dc converter operating at 4 kHz is measured at 98.1% during battery charging and at 98.2% during battery discharging. The converter maintains a high efficiency of more than 97% in a wide range of power transfer.
机译:本文提出了一种用于连接到电网的电池储能系统的高效双向隔离式DC-DC转换器。它讨论了转换器的设计,最佳工作频率范围以及6kW全桥双向隔离式DC-DC转换器的最佳死区时间,重点是提高转换器效率。本文还提供了额定功率下DC-DC转换器的功耗损失。通过使其与频率有关的损耗等于其与频率无关的损耗,来定义dc-dc转换器的最佳频率范围。最佳死区时间由谐振周期的四分之一定义。在电池充电期间,以4 kHz工作的DC-DC转换器的最大效率为98.1%,在电池放电期间为98.2%。该转换器可在各种​​功率传输范围内保持97%以上的高效率。

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