基于电压内积的带并联电抗器输电线路单相自适应重合闸

发布时间：2018-10-12 09:34

【摘要】：针对带并联电抗器的超高压输电线路,提出一种基于电压内积的单相自适应重合闸实现方案。在线路发生单相接地故障且故障相两端断路器跳开后,求出健全相电压和与故障相端电压的内积为始化内积,健全相电压和与故障相端电压一阶导数电压的内积为补偿内积。对于永久性故障,经短暂态后,始化内积小于补偿内积,两内积曲线不会出现交点。对于瞬时性故障,在二次电弧初始阶段,始化内积小于补偿内积;随着电弧电阻增加,始化内积逐渐增加,补偿内积逐渐减小,两内积曲线出现交点;在恢复电压阶段,两内积呈低频振荡曲线且相位相差90°,并相互交错再次出现交点。基于上述现象,通过两内积曲线是否出现交点来区别永久性和瞬时性故障,并当出现第二个交点时可以确定瞬时性故障已进入恢复电压阶段。该方法不需要整定,在断路器单相跳开后启动判据,实现简便,不需要频域计算、不受低频振荡分量的影响。EMTP仿真和实际录波数据验证了其正确性和可行性。
[Abstract]:A single-phase adaptive reclosing scheme based on voltage inner product is proposed for UHV transmission lines with parallel reactors. After the single-phase grounding fault occurs on the line and the circuit breaker at both ends of the fault phase jumps, the inner product of the perfect phase voltage and the terminal voltage of the fault phase is obtained as the initial inner product, and the inner product of the sound phase voltage and the first derivative voltage of the fault phase voltage is the compensated inner product. For the permanent fault, the initial inner product is less than the compensated inner product after the transient state, and the intersection of the two inner product curves will not appear. For transient faults, at the initial stage of secondary arc, the initial inner product is less than the compensated inner product; with the increase of arc resistance, the initial inner product increases gradually, the compensated inner product decreases, and the curve of the two inner products intersects. The two inner products show low frequency oscillation curve and the phase difference is 90 掳, and the intersecting points appear again. Based on the above phenomenon, the permanent and transient faults are distinguished by whether there are intersection points in the two inner product curves, and when the second intersection occurs, it can be determined that the transient fault has entered the stage of recovery voltage. The method does not need to be set, and it is easy to realize, and does not need to be calculated in frequency domain, and is not affected by the low frequency oscillation component. The correctness and feasibility of the method are verified by EMTP simulation and actual recording data.
【作者单位】：湖南大学电气与信息工程学院;湖南省电力公司科学研究院;
【基金】：国家自然科学基金(51677060) 国家电网公司研究开发项目(5216A313500N)资助
【分类号】：TM75

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