Protection of Low-Voltage DC Microgrids
Protection of Low-Voltage DC Microgrids
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DOI：
10.1109/tpwrd.2009.2016622
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发表时间：
2009-04
影响因子：
4.4
通讯作者：
D. Salomonsson;Lennart Söder;Ambra Sannino
中科院分区：
文献类型：
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作者：
D. Salomonsson;Lennart Söder;Ambra Sannino
提出了一种低压直流微网保护系统的设计方案。低压直流微电网用于互连分布式资源和敏感电子负载。在设计LV DC微电网保护系统时，可以使用来自现有DC电力系统的知识。然而，在大多数情况下，这些系统使用在直流故障期间具有限流能力的并网整流器。相比之下，低压直流微电网必须通过具有双向功率流的转换器连接到交流电网，因此需要不同的保护系统设计。本文介绍了国内外现有的和正在研究的低压直流保护装置的工作原理和技术参数。此外，不同的故障检测和接地方法进行了讨论。通过仿真研究了所选保护装置和接地方式对低压直流微电网的影响。结果表明，它是可能的，使用现有的设备来保护这样的系统。高阻抗接地故障可能会出现难以检测的问题。
In this paper, a low-voltage (LV) DC microgrid protection system design is proposed. The LV DC microgrid is used to interconnect distributed resources and sensitive electronic loads. When designing an LV DC microgrid protection system, knowledge from existing DC power systems can be used. However, in most cases, these systems use grid-connected rectifiers with current-limiting capability during DC faults. In contrast, an LV DC microgrid must be connected to an AC grid through converters with bidirectional power flow and, therefore, a different protection-system design is needed. In this paper, the operating principles and technical data of LV DC protection devices, both available and in the research stage, are presented. Furthermore, different fault-detection and grounding methods are discussed. The influence of the selected protection devices and grounding method on an LV DC microgrid is studied through simulations. The results show that it is possible to use available devices to protect such a system. Problems may arise with high-impedance ground faults which can be difficult to detect.