| 引用本文: | 刘海涛,徐旖旎,刘艳梅,罗国敏,熊雄,孙丽敬,季宇.基于Daniel趋势检验的柔性直流配电网纵联保护方案[J].电力自动化设备,2022,42(9): |
| LIU Haitao,XU Yini,LIU Yanmei,LUO Guomin,XIONG Xiong,SUN Lijing,JI Yu.Pilot protection scheme based on Daniel trend test for flexible DC distribution network[J].Electric Power Automation Equipment,2022,42(9): |
|
| 摘要: |
| 柔性直流配电网的低阻尼特性与开关器件的弱耐流能力之间的矛盾日益尖锐，给继电保护带来了严峻挑战。为此，提出一种基于Daniel趋势检验的柔性直流配电系统纵联保护方案，提取信号低频带数据信息，通过正、负极电压的Spearman秩相关系数状态值之和判别故障极；利用线路两侧电流的Spearman秩相关系数状态值乘积识别故障区域。仿真结果表明，所提保护方案能够可靠识别故障，且具备较强的耐受过渡电阻能力和抗噪声能力。 |
| 关键词: 配电网 故障特性 趋势检验 线路保护 故障识别 |
| DOI：10.16081/j.epae.202204006 |
| 分类号:TM77 |
| 基金项目:国家电网有限公司总部科技项目(5400-201917156A-0-0-00) |
|
| Pilot protection scheme based on Daniel trend test for flexible DC distribution network |
|
LIU Haitao1, XU Yini1, LIU Yanmei2, LUO Guomin2, XIONG Xiong1, SUN Lijing1, JI Yu1
|
|
1.State Grid Shanghai Energy Interconnection Research Institute Co.,Ltd.,Shanghai 201213, China;2.School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
|
| Abstract: |
| The contradiction between the low damping characteristics of the flexible DC distribution network and the weak current withstand capability of the switching devices is becoming increasingly acute, which brings severe challenges to the relay protection. For this reason, a pilot protection scheme based on Daniel trend test for flexible DC distribution system is proposed. The low-frequency data information of the signal is extracted, and the faulty pole is identified by the sum of the state values of the Spearman rank correlation coefficients of the positive-and negative-pole voltages. Then, the product of the state value of the Spearman rank correlation coefficients of the current on both sides of the line is used to identify the fault area. Simulative results show that the proposed protection scheme can reliably identify faults, and has strong ability to withstand transition resistance and noise. |
| Key words: distribution network fault characteristics trend test line protection fault identification |
