适配高渗透率DG接入配电网的幅值比较式保护

对于高渗透率分布式电源(DG)接入的配电网,提出了新型综合电流幅值比较的保护原理,通过线路两端分相全电流幅值以及正序故障电流幅值的比较进行故障定位,实现了低成本与高可靠性的兼容。并通过PSCAD搭建10 kV含分布式电源配电网模型,全面仿真了不同DG渗透率、故障位置、故障类型、过渡电阻、非同步数据等多种因素对保护原理的影响。经过理论分析和仿真,证明方案能够准确实现故障定位,利用的数据简单,耐过渡电阻能力优秀,保护配置要求低,抗同步误差强。

Amplitude comparison protection for distribution network with high permeability distributed generation

For distribution networks with high-permeability Distributed Generation (DG), this paper proposes a novel integrated current amplitude protection principle by comparing the two ends of the line full phase current amplitude and positive sequence fault current amplitude which achieves low-cost and high-reliability compatibility. The model of 10 kV active distribution network is built by PSCAD to comprehensively simulate the influence of different DG permeability, fault location, fault type, transition resistance, asynchronous data and other factors on the protection principle. After theoretical analysis and simulation, it is proved that the scheme can accurately solve the fault location problems, the data used is simple, the resistance to transition resistance is excellent, the protection configuration is low, and the ability of resisting synchronization error is strong. This work is supported by National Natural Science Foundation of China (No. 51377100) and Science and Technology Project of State Grid Shandong Electric Power Company (No. 52061216000M).