基于VPC-EMTR理论的直流配电网故障选线  

Fault Line Selection in DC Distribution Network Based on VPC-EMTR Theory

作　　者：张希鹏 邰能灵[1] 范春菊[1] 郑晓冬[1] 黄文焘[1] ZHANG Xipeng;TAI Nengling;FAN Chunju;ZHENG Xiaodong;HUANG Wentao(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《高电压技术》2020年第5期1730-1739,共10页High Voltage Engineering

基　　金：国家自然科学基金(51877135);国家重点研发计划(2016YFB0900601,2017YFB0903201)。

摘　　要：为了精确识别直流配电网故障线路,缩小失电范围,并降低支节点附近故障选线盲区,提出了基于变相位系数–电磁时间反转(variable phase coefficient-electromagnetic time reversal,VPC-EMTR)的多端故障选线方法。该方法根据配电网拓扑和线路参数建立了无损镜像线路网络,利用测量点处的时间反转后的1模电流在无损镜像网络中建立电流源,并计算该线路网络中每一点处的假想故障的故障电流有效值,最大有效值所处线路即为故障线路。该方法设置各镜像支路的相位系数与其长度呈高斯分布函数关系,使得支节点附近的故障测距结果偏移至线路中间处。同时,该方法利用最少测量点二次计算故障选线结果,减少了多余测量点对选线结果的影响,保证了故障选线结果的可靠性。在理论上对该方法进行了证明,并在PSCAD中建立了“手拉手”型多端直流配电网络来验证该方法的有效性,仿真结果表明:基于VPC-EMTR的多端故障选线法的选线结果准确,能够减少支节点附近选线的盲区。In order to select a fault line in DC distribution network precisely,reduce the blackout area and the blind area of fault line selection near the branch nodes,a variable phase coefficient-electromagnetic time reversal(VPC-EMTR)-based method for fault line selection is proposed in distribution network.A lossless mirror network is established according to the topology and parameters of the distribution.The measured 1-mode currents are time reversed and set as the current sources at the terminals of each mirror line.The RMS value of the assumed fault current in the mirror network is calculated,and the peak value of all RMS values appears in the fault line.In the method,the relationship between the phase coefficient and the length for each line is set as a Gaussian distribution function,thus the fault location results near the branch nodes move to the middle part of the line.The result of fault line selection is then recalculated,which can decrease the effects from the redundant measured currents and ensure the reliability of the results.The proposed theory is proved correct in this paper.A hand-in-hand DC distribution network is simulated in PSCAD to verify the effectiveness of the proposed method.The simulation results show that the results of fault line selection based on the EMTR method with multiple observers are precise.The blind area of fault line selection method can be reduced by using the VPC.

关 键 词：变相位系数 电磁时间反转 无损镜像线路网络 故障选线 最少测量点 假想故障 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM721.1