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首页> 外文期刊>Electric power systems research >A novel transmission line fault detection algorithm based on pilot impedance
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A novel transmission line fault detection algorithm based on pilot impedance

机译：基于导频阻抗的新型传输线故障检测算法

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摘要

Modern power grids that have complicated network structures and changeful operating conditions bring challenges to conventional backup protection. A novel fault detection algorithm based on pilot impedances using the synchronized data for transmission line is proposed to improve the sensitivity and reliability of the protection. The novel pilot impedances at both sides of the line are respectively defined by the fault components of positive-, negative-, zero-sequence currents and voltages. The fault judging quantities that fuse pilot impedances are given to establish the protection criterion. The blocking measures are taken to overcome the maloperation problem during power swing and open-phase operation. The proposed algorithm is extensively validated on IEEE 39 bus system and 500 kV two-machine system under various conditions, including internal and external faults, the load encroachment, open-phase operation, power swing and unsynchronized data. The simulation results on PSCAD/EMTDC illustrate that the proposed algorithm can reliably detect the faulted line under various conditions, and have good abilities to resist the fault types, transition resistance, and unsynchronized data.
机译：具有复杂的网络结构和变化的运行条件的现代电网给常规的备用保护带来了挑战。为提高保护的灵敏度和可靠性，提出了一种基于导频阻抗的故障检测算法，该算法利用传输线的同步数据。线路两侧的新型导频阻抗分别由正序，负序，零序电流和电压的故障分量定义。给出融合导频阻抗的故障判断量以建立保护标准。采取了闭锁措施来克服功率摆幅和断相运行期间的误操作问题。该算法在IEEE 39总线系统和500 kV两机系统上的各种条件下得到了广泛的验证，包括内部和外部故障，负载侵入，断相运行，功率摆幅和不同步数据。在PSCAD / EMTDC上的仿真结果表明，该算法能够在各种条件下可靠地检测出故障线路，并具有良好的抵抗故障类型，过渡电阻和不同步数据的能力。

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