The Grounding Mode Based on the DG Interconnection Transformer and the Selection of Relevant Zero Sequence Protection Scheme
Abstract: More and more DG is interconnected through the low voltage distribution network; how to choose a protection scheme which doesn’t depend on the nature of DG, and find a reliable operation mode are a big issue faced by engineers. The rational allocation of interconnection coupling point pro-tection scheme not only can judge the system fault in time, but also at the same time can maintain the protective properties in the dynamic process of the formation of island and after the operation mode of island division in DG Island. Always keeping the fault with sufficient selectivity within the island is the problem to be solved in this study. This paper analyzed the relationship between the zero sequence current and zero sequence voltage through the selection of the grounding method of the DG interconnection transformer; the optimization of the protection scheme can realize the inhibition of zero sequence over-voltage occurring in DG interconnection and running off network, and at the same time, it can work out a set of the protection optimization scheme in view of DG in-terconnection transformer grounding system by using the zero sequence quantity as a stable cri-terion at fault time. Finally, the protection scheme of DG low-voltage interconnection is generated by the COBASE system, which is proved to be of good quality in the process of interconnection and island formation.
文章引用: 林 霞 , 李 瑶 , 李 强 , 朱新颖 , 张英彬 (2015) 基于DG并网变压器接地方式及相关零序保护方案选择。 智能电网， 5， 252-261. doi: 10.12677/SG.2015.55030
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