基于电流幅值比的有源配电网自适应差动保护原理  

Adaptive Differential Protection Principle for Active Distribution Network Based on Current Amplitude Ratio

作　　者：高岩 李永丽 陈晓龙 赵自刚 王强 任江波 GAO Yan;LI Yongli;CHEN Xiaolong;ZHAO Zigang;WANG Qiang;REN Jiangbo(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;State Grid Hebei Electric Power Co.,Ltd,Shijiazhuang 050000,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]国网河北省电力有限公司,石家庄050000

出　　处：《电力系统及其自动化学报》2021年第2期1-7,共7页Proceedings of the CSU-EPSA

基　　金：国家电网有限公司总部科技资助项目(适应灵活可控源荷接入的新型城市电网继电保护关键技术研究及应用)。

摘　　要：随着分布式电源在配电网中渗透率的不断提高,电流差动保护可能会出现灵敏性的问题。首先对线路两侧故障电流幅值的关系进行分析,然后根据此特性提出了基于电流幅值比的自适应电流差动保护原理,该原理采取了在不同故障位置时具有不同制动系数值的方法。通过理论分析及Matlab/Simulink仿真验证可知,该原理可在保证区外故障不误动的同时,有效地提升了区内故障时的动作灵敏性,具有较强的工程实际意义。As the penetration of distributed generations in distribution network continues to increase,the sensitivity of current differential protection may appear.In this paper,the relationship between the fault current amplitudes on both sides of the line is analyzed,based on which an adaptive current differential protection principle is proposed on the basis of current amplitude ratio.Under this principle,different braking coefficients are adopted at different fault locations.Through theoretical analysis and Matlab/Simulink simulations,it is found that the proposed principle can effectively improve the sensitivity of action under fault within the zone while ensuring that there is no maloperation under out-of-zone fault,showing strong practical significance in engineering.

关 键 词：配电线路 差动保护 故障分量 自适应 

分 类 号：TM77[电气工程—电力系统及自动化]