| 引用本文: | 李娟,高厚磊,弓新月,孔祥平,高磊.一种用于配电网故障数据自同步的故障时刻检测方法[J].电力系统保护与控制,2018,46(4):92-98.[点击复制] |
| LI Juan,GAO Houlei,GONG Xinyue,KONG Xiangping,GAO Lei.A novel fault instant detection scheme for fault data self-synchronization method in distribution network[J].Power System Protection and Control,2018,46(4):92-98[点击复制] |
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| 摘要: |
| 配电网故障数据自同步算法以故障发生时刻为基准，不依赖于外部对时装置，不受数据通信传输路径与通信信道延时的影响，可以在较低成本的情况下实现故障数据的同步。而精确的故障发生时刻检测是实现故障数据自同步的关键。为此提出了适用于故障数据对时同步的故障时刻精确检测方法。该方法首先利用故障信号构造Hankel矩阵，对故障信号进行分解，得出细节信号，最后结合模极大值法求解故障数据的奇异点，即故障发生时刻。仿真结果表明，该方法可以有效降低因故障检测延时不同导致的同步误差，且具有较高稳定性。 |
| 关键词: 电流差动保护 对时同步 故障时刻 Hankel矩阵 |
| DOI：10.7667/PSPC170142 |
| 投稿时间：2017-02-06修订日期：2017-05-30 |
| 基金项目:国家电网公司科技项目“适应高渗透率分布式电源接入的配电网继电保护技术研究”;国网江苏省电力公司科技项目“基于多源信息的配网高效故障定位技术研究与示范应用” |
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| A novel fault instant detection scheme for fault data self-synchronization method in distribution network |
| LI Juan,GAO Houlei,GONG Xinyue,KONG Xiangping,GAO Lei |
| (State Grid Jiangsu Electric Power Co., Ltd.Research Institute, Nanjing 211103, China;Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University, Jinan 250061, China) |
| Abstract: |
| In distribution network, fault data self-synchronization method which takes the fault instant for reference can realize fault data self-synchronization without external time identifying facility, which makes a low investment. And it is also little affected by data communication channel or channel time delay. However, the precise detection of fault instant relates to the self-synchronization error directly. Therefore, a fault instant detection scheme for fault data self-synchronization method in distribution network is proposed. In this scheme, fault data is used to form Hankel matrix and Singular Value Decomposition (SVD) is used to decompose signals. In this way, detail signals reflecting singularity can be gained. And then singular point, i.e. fault instant, can be obtained by modulus maximum method. The simulation results verify that this scheme proposed can effectively reduce synchronous error caused by different delay of fault detection and has a high stability. This work is supported by Science and Technology Project of State Grid Corporation of China “Study on the Relay Protection Techniques in Distribution Network with High Permeability of Distributed Generation” and Science and Technology Project of State Grid Jiangsu Electric Power Co., Ltd “Research and Demonstration of Fault Location Technology with High Efficiency based on Multi-source Information”. |
| Key words: current differential protection time synchronization fault instant Hankel matrix |
