引用本文: | 徐铭铭,高淑萍,常仲学,等.基于模型识别的消弧线圈接地系统单相接地选线方法[J].电力系统保护与控制,2018,46(2):73-78.[点击复制] |
XU Mingming,GAO Shuping,CHANG Zhongxue,et al.Model recognition based single-phase earthed faulty line selection method of Petersen coil grounded system[J].Power System Protection and Control,2018,46(2):73-78[点击复制] |
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摘要: |
基于模型识别的继电保护思想提出了一种消弧线圈接地系统单相接地故障选线新方法。在特征频带内将线路等效成电容模型,首先利用故障暂态信号通过最小二乘方法求解出各出线的电容初值,然后用故障稳态信号求解电容值并与电容初值比较。由于故障线路不符合所建立的电容模型,模型误差较大;健全线路基本符合所建立的电容模型,模型误差接近于0,基于此特点就可以实现故障线路的识别。该方法具有自举性,通过仿真和录波数据验证了所提方法的有效性。 |
关键词: 配电网 故障选线 模型识别 最小二乘拟合算法 |
DOI:10.7667/PSPC162117 |
投稿时间:2016-12-28修订日期:2017-03-29 |
基金项目:国家电网公司科技项目“考虑人身安全防护的配电网单相接地故障快速处理关键技术研究” |
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Model recognition based single-phase earthed faulty line selection method of Petersen coil grounded system |
XU Mingming,GAO Shuping,CHANG Zhongxue,MA Jianwei,CHEN Wei,SONG Guobing |
(State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China;School of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;Henan EPRI Electric Technology Co., Ltd., Zhengzhou 450000, China) |
Abstract: |
A new method of faulty line selection method based on model recognition for Petersen coil grounded system is presented. The equivalent circuit of every line is modeled as capacitance during fault characteristic frequency band. The initial value of capacitance is calculated by transient information through least square fitting. Then capacitance value calculated by the steady-state signal is compared with the initial value. It is found that fault line does not meet the established capacitance model and model error is large; while the sound line is basically in accordance with the established capacitance model and the model error is close to zero. Based on these characteristics, faulty line selection criteria is constructed. This method has a bootstrap characteristic. Simulation and field recording data show that the proposed method is feasible. This work is supported by Science and Technology Project of State Grid Corporation of China “Research of Key Technologies for Fast Handling of Distribution Network Single-phase Grounding Fault Considering Personal Safety Protection”. |
Key words: distribution network fault line selection model recognition least square fitting |