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电网技术  2015 

基于录波数据的保护安全裕度评估方法

DOI: 10.13335/j.1000-3673.pst.2015.04.035, PP. 1109-1114

Keywords: 继电保护,定值校验,故障录波,安全裕度

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Abstract:

在系统运行方式变化后,需要校验保护定值的有效性,为此提出一种利用故障录波数据进行保护定值校验的新方法。为定量刻画故障量离动作边界的远近,给出了保护安全裕度的定义,可评估保护拒动的风险。为校验线路末端故障时保护定值的有效性,利用实际录波数据先计算故障点位置、过渡电阻、故障类型以及线路两端等值电源,再计算如果该故障发生在线路末端时的故障量,最后据此计算线路末端故障时的保护安全裕度。利用PSCAD搭建了线路故障的仿真模型,以线路末端故障时的仿真结果为真值,比较了利用上述方法计算线路末端故障时的故障量与真值的误差,误差分析表明故障量幅值的相对误差不超过10%,角度误差不超过15°,证明了上述方法的有效性。

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