摘要
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。
To verify the relay settings after the operation mode of power systems is changed, a new method based on fault recording data is proposed. A relay gecurity margin is defined, through which the risk of relay refusal tripping can be evaluated and the distance between fault measures and relay tripping edges can be quantified. In order to verify the relay settings when a fault happens at the end of protection range, firstly the fault location, transient resistance, fault type and equivalent sources at the both ends of line are calculated using actual fault recording data; then the measures when the fault happens at the end of line are computed; finally the relay security margins for the fault are calculated based on the measures. A simulation model for the line fault is built by PSCAD, and taking the simulated results as true values the errors between the fault measures calculated by the proposed method and the true values are compared. The analysis of errors indicate that the relative errors for magnitudes are less than 10% and the degree errors are less than 15 degree, which demonstrates the proposed method is valid.
出处
《电网技术》
EI
CSCD
北大核心
2015年第4期1109-1114,共6页
Power System Technology
基金
国家高技术研究发展计划(863计划)资助项目(2012AA050803)
国家电网公司新一代智能变电站专项资助(JBB17201200396)~~
关键词
继电保护
定值校验
故障录波
安全裕度
relay protection
setting verification
fault recording
security margin
