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Master–slave DC droop control for paralleling auxiliary DC/DC converters in electric bus applications

机译:主从DC下降控制,用于电气总线应用中的并联辅助DC / DC转换器

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摘要

This study reviews the causes of power losses in a DC/DC converter, relates those losses with efficiency profiles, and details different strategies for maximising efficiency when several converters are placed in parallel. The research is focused on electric bus applications, where several converters are usually connected in parallel in order to fulfil the power requirements of the bus models. In a bus, the low-voltage DC link (28 V) resembles a microgrid that has some generators (DC/DC converters), an energy storage system (lead-acid batteries) and certain loads. To share the converters' output power, a droop control is proposed. Furthermore, traditional droop control is improved by adding a master-slave control. The proposed master-slave droop control improves efficiency by more than 3% at low power with no additional hardware. Experimental results show how two 5 kW converters work in parallel using the proposed control.
机译:这项研究回顾了DC / DC转换器中功率损耗的原因,将这些损耗与效率曲线相关联,并详细介绍了将多个转换器并联时最大化效率的不同策略。该研究集中在电动总线应用上,其中通常并联连接多个转换器以满足总线模型的功率要求。在总线中,低压直流链路(28 V)类似于微电网,该微电网具有一些发电机(DC / DC转换器),一个能量存储系统(铅酸蓄电池)和某些负载。为了共享转换器的输出功率,提出了下垂控制。此外,通过增加主从控制来改善传统的下垂控制。拟议的主从下降控制可在低功率下将效率提高3%以上,而无需其他硬件。实验结果表明,使用建议的控制,两个5 kW转换器如何并行工作。

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