新能源场站并网联络线纵联零序方向保护的整定研究  

The setting of zero sequence directional pilot protection for a grid tie-line of a new energy station

作　　者：梁振锋[1] 马龙 桂小智 潘本仁 王晓卫 LIANG Zhenfeng;MA Long;GUI Xiaozhi;PAN Benren;WANG Xiaowei(Xi'an University of Technology,Xi'an 710054,China;State Grid Jiangxi Electric Power Research Institute,Nanchang 330000,China)

机构地区：[1]西安理工大学,陕西西安710054 [2]国网江西省电力有限公司电力科学研究院,江西南昌330000

出　　处：《电力系统保护与控制》2023年第13期82-90,共9页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52177114);国网江西省电力有限公司科技项目资助(52182020008H)。

摘　　要：提出了新能源并网联络线零序方向纵联保护的整定方法。考虑了新能源场站的各种主变联结组别,包括YNd、YNdd、YNynd接线方式,推导了并网联络线区内与区外接地故障时线路两侧零序测量阻抗表达式。结果表明:并网联络线区内接地故障时,主变采用YNd、YNdd联结组别的新能源场站侧零序测量阻抗与联结组别有关,而主变采用YNynd联结组别的新能源场站侧零序测量阻抗与联结组别和系统运行方式有关。据此给出了新能源并网联络线零序正方向元件和反方向元件最大灵敏角和动作区的整定方法。PSCAD/EMTDC仿真结果表明,各种故障情况下的零序阻抗角与分析结论一致,零序方向纵联保护能够正确可靠动作。A new energy grid tie-line zero-sequence directional pilot protection setting method is proposed.Considering various connection groups of main transformers in new energy stations,including YNd,YNdd,YNynd connection types,the expressions of zero-sequence measured impedance on both sides of the line are derived when ground faults occur inside and outside the grid tie-line.The results show that the zero-sequence measurement impedance of the new energy station side of the main transformer with YNd,YNdd connection types is related to the main transformer connection group when the grounding fault occurs in the grid tie-line area.The YNynd connection type is related to the main transformer connection group and the system operation mode.Based on the results,the setting method of the maximum sensitive angle and action zone of the zero-sequence positive and negative directional elements of the new energy grid tie-line is given.PSCAD/EMTDC simulation results show that the zero-sequence impedance angle is consistent with the analysis conclusion in various fault conditions,and the zero-sequence directional pilot protection can operate correctly.

关 键 词：新能源场站 零序方向纵联保护 并网联络线 零序阻抗角 变压器联结组别 

分 类 号：TM773[电气工程—电力系统及自动化]