基于先导发展模型的输电线路绕击跳闸率计算

发布时间：2018-10-15 12:21

【摘要】：雷电绕击是影响电力系统安全稳定运行的关键因素之一,现有输电线路雷电绕击分析模型对先导起始和发展过程的描述较为简化。为此,根据正极性上行先导起始和发展机理,提出了用于单根导线和分裂导线的上行先导起始判据,并提出了1种考虑背景电位变化贡献的流注空间电荷计算方法,在此基础上建立了绕击跳闸率计算模型和自适应算法,最后对我国典型的500 kV线路的绕击特性开展了仿真研究。计算结果表明,低电压等级时该模型得到的先导起始时刻与Rizk判据和临界半径判据基本一致,500 kV输电线路绕击跳闸率平原地区为0.012次/(100 km·a),山地地区为0.211次/(100 km·a),与我国运行经验相符。绕击跳闸率自适应算法与原有方法相比,在同样精度下所需计算时间更短。
[Abstract]:Lightning wound failure is one of the key factors affecting the safe and stable operation of power system. For this reason, according to the mechanism of the initiation and development of the positive uplink lead, a criterion for the initiation of the uplink guide for single and split conductors is proposed, and a new method for calculating the space charge of streamer is proposed, which takes into account the contribution of background potential changes. On this basis, the calculation model and adaptive algorithm of tripping rate are established. At last, the simulation of the typical 500 kV transmission line in China is carried out. The results show that, The initial leading time obtained by the model at low voltage level is basically consistent with that of Rizk criterion and critical radius criterion. The tripping rate of 500 kV transmission lines in plain area is 0.012 times / (0.211 times / (100 km a),) in mountainous area of 100 km a), is consistent with the operation experience in China. Compared with the original method, the calculation time of the adaptive algorithm is shorter than that of the original method.
【作者单位】：清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室;广州供电局有限公司电力试验研究院;
【基金】：国家自然科学基金(51577098)~~
【分类号】：TM75;TM863

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