架空输电线路长间隙交流电弧不规则运动引发动态阻抗突变的机理研究

项目名称： 架空输电线路长间隙交流电弧不规则运动引发动态阻抗突变的机理研究

项目编号： No.51507058

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 孙秋芹

作者单位： 湖南大学

项目金额： 21万元

中文摘要： 架空输电线路长间隙交流电弧发展过程中常发生不规则运动现象，如阳极弧根跳跃、阴极弧根激发、弧柱短路和旋转等。电弧不规则运动易导致电弧电流和电压发生突变，影响燃弧的稳定性。本项目针对长间隙交流电弧不规则运动引发电弧动态阻抗突变的现象率先开展理论探索与技术创新研究。建立长间隙交流电弧试验系统，采用先进光学、电学同步测量方法，获得电弧的运动轨迹和关键状态参量，研究电弧不规则运动瞬时的动态演化规律。将光滑粒子流体动力学方法引入到电弧不规则运动的建模中，分析SPH方法在模拟电弧不规则运动现象中的数值计算问题，并从核函数的形式、光滑长度、粒子间距等方面对其进行优化，形成一套针对长间隙交流电弧运动的仿真方法。对比实验数据和仿真结果，从微观角度定量研究长间隙交流电弧不规则运动时的电流、电压变化，揭示电弧不规则运动引发动态阻抗突变的机理。

中文关键词： 长间隙交流电弧；不规则运动；动态阻抗；光滑粒子流体动力学；光学测量

英文摘要： The irregular motion of long AC arc of overhead transmission lines, such as anode arc root jumping, cathode arc root excitation and short circuit and rotation of arc column, is a common phenomenon in a power system. The irregular motion of AC arc would lead to a sudden change of the arc voltage and current, resulting in the instability of the arcing process. This objective of this proposal is to study the phenomenon of sudden change of arc impedance, which is caused by the irregular arc motion. Firstly, the experimental setup equipped with advanced optical and electrical instrument which are triggered by the same signal, is established for the long AC arc. The arc trajectory and the critical physical property of the arc are acquired and the evolutionary of the irregular arc motion are investigated. The smoothed particle hydrodynamics (SPH) method is introduced to the area of the irregular arc motion, and the issues related to the SPH in numerical simulation is discussed in detail. A series of the optimized simulation method regarding to the irregular arc motion is achieved. By comparison with experimental results, the applicability of the SPH is verified. From the perspective of micro, the influence of the irregular arc motion on the arc voltage and current is quantitatively studied and the mechanism of the sudden change of the arc impedance is finally illustrated.

英文关键词： Long AC Arc;Irregular Motion;Dynamic Impedance;Smoothed Particle Hydrodynamics;Optical Measurement