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提出一种基于模型识别的带并联电抗器输电线路三相重合闸永久性故障判别方法。该方法以选相结果为基础,以瞬时性故障π形模型为识别模型,将并联电抗器电流作为已知量,求取本端及对端线模电压和电容电流的线模分量,进而求解两端并联电抗器电流和电容电流线模分量之和。瞬时性故障时,故障模型与识别模型一致,求解值等于0;永久性故障时,故障模型与识别模型不一致,求解值不等于0。据此可以判别是否为永久性故障。电磁暂态分析程序(EMTP)仿真表明,该方法能够有效识别永久性故障,可靠实现带并联电抗器输电线路的三相自适应重合闸。
This paper presents a method of discriminating three-phase reclosing permanent fault of transmission line with shunt reactor based on model identification. Based on the results of the phase selection, the instantaneous fault π model is used as the identification model and the shunt reactor current is taken as the known quantity. The linear mode components of the voltage and the capacitor current of the local and opposite ends are obtained, and then two Sum of shunt reactor current and capacitor current line mode components. In the case of a transient fault, the fault model is consistent with the recognition model, and the solution value is equal to 0; in the case of a permanent fault, the fault model is not consistent with the recognition model and the solution value is not equal to zero. According to this can be identified as a permanent fault. Electromagnetic transient analysis program (EMTP) simulation shows that this method can effectively recognize permanent faults and reliably realize three-phase adaptive reclosing of transmission lines with shunt reactors.