基于CLC调谐半波长输电线路边界特性的纵联保护  

Pilot protection based on boundary characteristics of CLC tuned half-wavelength transmission line

作　　者：束洪春[1] 唐玉涛 张宇[1] 韩一鸣 代月 薄志谦 SHU Hongchun;TANG Yutao;ZHANG Yu;HAN Yiming;DAI Yue;BO Zhiqian(State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection,Protection and Control Jointly,Kunming University of Science and Technology,Kunming 650500,China;Faculty of Resources Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学省部共建智能电网故障检测与保护控制协同创新中心,云南昆明650500 [2]昆明理工大学国土资源工程学院,云南昆明650500

出　　处：《电力自动化设备》2023年第4期1-9,共9页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51977102);云南省重大科技专项计划项目(202002AF080001)。

摘　　要：当发生线路内部故障时,调谐电路与线路连接处线路侧测点采集的故障电流高频成分丰富;当发生线路外部故障时,线路侧测点采集的电流高频成分较小,借此特性构造一种基于调谐电路边界特性的半波长输电线路边界特性的方向元件。对于调谐电路,利用其无故障模型,将模拟电流波形进行比较匹配,若匹配成功,则说明调谐电路内部无故障,否则调谐电路内部有故障。将方向元件与调谐电路保护结合构成其纵联保护方案,此纵联保护无需双端数据同步。大量RTDS实时数模混合测试表明,该纵联保护方案全线长范围内有效,不受电流互感器饱和的影响,具有较好的鲁棒性。When the fault occurs inside the line,the fault current collected at the line-side measuring point at the connection between the tuned circuit and the transmission line is rich in high-frequency components.When the external fault occurs,the high-frequency components collected from the line-side is in scarcity,this boundary characteristic is used to construct a directional element for half-wavelength transmission line.For the tuned circuit,the simulated current waveform is matched with the measured waveform using its faultless model,and if the match is successful,there is no fault inside the tuned circuit,otherwise,there is a fault inside the tuned circuit.The combination of the directional element and the tuned circuit protection constitutes its pilot protection scheme without the need of double-end data synchronization.A large number of RTDS real-time digital-analog hybrid tests show that the pilot protection scheme is effective over the full line length range and is not affected by current transformer saturation,and has good robustness.

关 键 词：调谐电路 半波长输电 边界特性 方向元件 纵联保护 

分 类 号：TM77[电气工程—电力系统及自动化]