一种光伏电站送出线路自适应距离保护方法

发布时间：2018-06-24 10:43

本文选题：光伏电站送出线路 + 过渡电阻　；参考：《电测与仪表》2017年20期

【摘要】：针对光伏电站送出线路光伏电站侧距离保护受过渡电阻影响的问题,提出一种自适应距离保护方法。分析比较了过渡电阻对传统双侧电源线路和对光伏电站送出线路距离保护的影响不同原理,根据过渡电阻影响距离保护测量阻抗偏移相量图的几何关系推导出了一种新的自适应保护判据,该判据加入了自适应整定系数,且自适应整定系数仅依赖于附加阻抗倾斜角的获得。通过公式推导获得了倾斜角与故障线路两侧电流幅值比和相位差的函数关系,从而提出一种光伏电站送出线路自适应距离保护方法。最后,在Dig SILENT/Power Factory软件中仿真对比了传统距离保护和改进距离保护下不同故障类型下光伏电站侧距离保护动作情况。仿真分析结果显示,所提方法极大地改善了过渡电阻对光伏电站送出线路距离保护的影响,从而验证了所提方法的可行性。
[Abstract]:To solve the problem that the side distance protection of photovoltaic power station is affected by the transition resistance, an adaptive distance protection method is proposed. The influence of transition resistance on the distance protection of the traditional double-side power supply line and the output line of photovoltaic power station is analyzed and compared. A new adaptive protection criterion is derived according to the geometric relation of the impedance offset phasor diagram of the distance protection measurement affected by the transition resistance. The adaptive tuning coefficient is added to the criterion. The adaptive tuning coefficient only depends on the slope angle of the additional impedance. The relationship between the angle of tilt and the ratio of current amplitude to amplitude and phase difference on both sides of the fault line is obtained by the formula derivation, and an adaptive distance protection method for the output line of the photovoltaic power station is proposed. Finally, the performance of side distance protection of photovoltaic power station under different fault types under traditional distance protection and improved distance protection is simulated and compared in Dig SILENT / Power Factory software. The simulation results show that the proposed method greatly improves the influence of the transition resistance on the distance protection of the transmission line in the photovoltaic power station, thus validating the feasibility of the proposed method.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：中央高校基本科研业务费专项资金资助项目(2017MS098)
【分类号】：TM615;TM773

【相似文献】