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电力大数据:2019,22(6):-
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一种基于虚拟阻抗的主动配电网故障区段定位方法
李莉1, 徐玉韬1, 张丽虹2, 潘波2, 熊炜2, 袁旭峰2
(1.贵州电网有限责任公司电力科学研究院;2.贵州大学电气工程学院)
A fault sectional location method for active distribution network based on virtual impedance
Li Li1, Xu Yutao1, ZhangLi-hong2, Pan Bo2, Xiong Wei2, YuanXu-feng2
(1.Guizhou Test and Research Institute,Guiyang;2.Electrical Engineering College,Guizhou University,Guiyang)
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投稿时间:2018-12-04    修订日期:2019-02-27
中文摘要: 主动配电网10kV馈线保护一般采用传统继电保护方案,但是DG的接入使得配电网网架结构变得复杂,传统的保护方法并不能满足主动配电网的保护要求。为解决现有保护方法易受系统参数和故障类型等因素的影响而不易识别单相接地故障等问题,提出一种基于虚拟阻抗的馈线分段保护配置方案,分析了基于虚拟阻抗法的故障识别原理,将电压的序分量和相应电流序分量的比值作为虚拟阻抗,通过判别虚拟阻抗的特征即可完成故障的定位。利用MATLAB/SIMULINK搭建配电网络模型,仿真结果表明基于虚拟阻抗判据能够快速准确识别各种类型的短路故障,区内故障时保护动作较快,区外故障时保护不动作,且其判别结果不会受到系统参数的影响,适用于复杂多变的主动配电网,具有较高的可靠性和选择性。
Abstract:The 10kV feeders’ protection of the active distribution network generally adopts the traditional relay protection scheme, but the access of the DGs make the grid structure of the distribution network complicated, and the traditional protection method cannot meet the protection requirements of the active distribution network. In order to solve the problem that the existing protection methods are vulnerable to factors such as system parameters and fault types, and it is not easy to identify single-phase ground faults, a virtual impedance-based feeder segmentation protection configuration scheme is proposed. The fault identification principle based on virtual impedance method is analyzed. The ratio of the voltage sequence component and the corresponding current sequence component is taken as the virtual impedance. The fault location can be completed by discriminating the characteristics of the virtual impedance. The distribution network model is built by MATLAB/SIMULINK. The simulation results show that the virtual impedance criterion can quickly and accurately identify various types of short-circuit faults. The protection action is faster when faults occur in the area, and the protection does not act when the faults occur outside the area, and the discrimination result is not affected by the system parameters, and is suitable for the complex and variable active distribution network, with high reliability and selectivity.
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基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
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