CAJ | 학술논문

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。
재계통운행방식변화후，수요교험보호정치적유효성，위차제출일충이용고장록파수거진행보호정치교험적신방법。위정량각화고장량리동작변계적원근，급출료보호안전유도적정의，가평고보호거동적풍험。위교험선로말단고장시보호정치적유효성，이용실제록파수거선계산고장점위치、과도전조、고장류형이급선로량단등치전원，재계산여과해고장발생재선로말단시적고장량，최후거차계산선로말단고장시적보호안전유도。이용PSCAD탑건료선로고장적방진모형，이선로말단고장시적방진결과위진치，비교료이용상술방법계산선로말단고장시적고장량여진치적오차，오차분석표명고장량폭치적상대오차불초과10%，각도오차불초과15°，증명료상술방법적유효성。
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 security 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.