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在分析带并联电抗器输电线路单相故障特点的基础之上,提出一种利用参数识别原理的单相自适应重合闸永久性故障识别方法。该方法以恢复电压阶段的瞬时性故障π型等效模型为参数辨识模型,将并联电抗器电感和中性点小电抗电感参数作为辨识参数,利用电感参数求解值与真实值的差异来区分永久性故障和瞬时性故障。瞬时性故障情况下,故障模型与求解模型一致,电感求解值与实际值差异很小;永久性故障情况下,故障模型与求解模型不一致,电感求解值与实际值差异明显。该方法判别原理简单可靠,仅利用单端电气量,且不需要长数据窗滤波,理论上不受低频振荡分量的影响。大量ATP仿真表明,该文判别方法能够快速识别永久性故障,能够用于带并联电抗器输电线路的快速单相自适应重合闸。
Based on the analysis of single-phase fault characteristics of transmission line with shunt reactors, a permanent fault identification method of single-phase adaptive reclosing using parameter identification principle is proposed. The method takes the π-type equivalent model of the instantaneous fault in the restoration phase as the parameter identification model, takes the shunt reactor inductance and the neutral point small reactance inductance as identification parameters, and uses the difference between the inductance and the real value to distinguish the permanent Sexual and transient faults. Under the transient fault condition, the fault model is consistent with the solution model, and the difference between the inductance solution value and the actual value is small. In the case of permanent faults, the fault model is inconsistent with the solution model, and the difference between the inductance solution value and the actual value is obvious. The principle of this method is simple and reliable, only using single-ended electrical quantities, and does not require long data window filtering, theoretically unaffected by low-frequency oscillation components. A large number of ATP simulations show that the proposed method can identify permanent faults quickly and can be used in fast single-phase adaptive reclosing of transmission lines with shunt reactors.