柔性直流配电线路能量分布差动保护

发布时间：2018-04-18 06:51

本文选题：差动保护 + 频段　；参考：《电网技术》2017年09期

【摘要】：提出了一种双端量直流线路保护算法,以保证直流配电系统安全可靠运行。通过分析直流双极短路故障差动电流频段分布,发现线路分布电容电流与故障电流的能量频段存在明显差异,利用区内故障时差动电流的能量主要分布在低频段,而区外故障时差流能量主要分布在高频段的特点,提出了基于能量分布的差动保护原理,给出了具体的动作判据与保护流程,分析了各种因素对保护的影响。仿真结果验证了所提保护算法的可行性,保护具有天然的选择性,可耐受较高过渡电阻、噪声(20d B)以及一定的同步误差(40?s),保护出口时间在3ms以内。本原理将分布电容的影响变为保护的制动量,因此区外故障时分布电容电流不会造成保护误动。
[Abstract]:A two-terminal DC line protection algorithm is proposed to ensure the safe and reliable operation of DC distribution system.By analyzing the frequency distribution of differential current in DC bipolar short circuit fault, it is found that there are obvious differences between the energy band of line distribution capacitance current and fault current, and the energy of differential current is mainly distributed in the low frequency band when the fault is used in the region.The energy distribution of time-difference flow outside the fault zone is mainly in the high frequency band. The principle of differential protection based on energy distribution is put forward, the concrete action criterion and protection flow are given, and the influence of various factors on the protection is analyzed.The simulation results verify the feasibility of the proposed protection algorithm. The proposed protection has natural selectivity, can withstand high transition resistance, noise 20 dB) and a certain synchronization error of 40wt. The protection exit time is within 3ms.In this principle, the effect of distributed capacitance is changed into the braking capacity of protection, so the distributed capacitance current will not cause protection misoperation when fault occurs outside the area.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);全球能源互联网研究院;
【基金】：国家重点研发计划基金资助项目(2016YFB0900503) 中央高校基本科研业务费基金项目(2016ZZD01) 国网公司科技项目(“柔性变电站成套设计技术研究及设备研制研究项目”)(SGRI-DL-71-15-011)~~
【分类号】：TM773

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