Ground Fault Analysis and Grounding Design Considerations in DC Microgrids

D. Jayamaha, N. Lidula, A. Rajapakse
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引用次数: 7

Abstract

Low voltage DC microgrids (DCMGs) are future power systems to meet the increasing energy demand and solve problems caused by conventional power systems. Although DCMGs have some clear advantages over AC microgrids, several DCMG issues are still open for study. DCMG system grounding is such an issue, and realizing a suitable grounding scheme would accelerate the integration of DCMGs to the utility network. To design suitable grounding and protection scheme for DCMGs, it is important to determine transient and steady state ground fault characteristics of the system. In this paper ground faults with different grounding configurations are simulated (PSCAD/EMTDC) and results are analyzed to identify grounding configurations and ground fault detection schemes, which enables reliable fault detection and uninterrupted supply to the loads.
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直流微电网接地故障分析及接地设计考虑
低压直流微电网(DCMGs)是满足日益增长的能源需求和解决传统电力系统所带来问题的未来电力系统。尽管DCMG与交流微电网相比有一些明显的优势,但DCMG的一些问题仍有待研究。DCMG系统接地就是这样一个问题,实现合适的接地方案将加快DCMG与公用事业网络的融合。确定系统的暂态和稳态接地故障特征是设计合适的接地和保护方案的关键。本文通过对不同接地配置(PSCAD/EMTDC)下的接地故障进行仿真,并对仿真结果进行分析,确定接地配置和接地故障检测方案,实现可靠的故障检测和对负载的不间断供电。
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