基于微分方程算法的光伏并网联络线故障定位方法研究  

Analysis on the tie-line fault location method based on the differential equation algorithm for the photovoltaic power plant when connecting to power system

作　　者：彭博 张彩萍[2] Peng Bo;Zhang Caiping(Zhengzhou Electric Power College,Zhengzhou 450000,China;Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]郑州电力高等专科学校,河南郑州450000 [2]北京交通大学,北京100044

出　　处：《可再生能源》2021年第10期1401-1406,共6页Renewable Energy Resources

摘　　要：光伏电机出力具有间歇性和波动性等特点,其短路故障特性与传统发电机有较大区别,对光伏并网联络线故障定位的动作性能有较大影响。文章提出了一种基于微分方程算法的故障定位方法,该方法首先利用微分方程算法构建故障暂态过程,然后采用二阶巴特沃斯低通滤波器对测量电压和电流进行处理,并采用故障点电压重构算法,提高了故障距离迭代的正确性和快速性。仿真结果表明,相比传统距离保护中的故障定位方法,所提出的光伏并网联络线故障定位方法的整体性能更好,可较好地满足大型光伏电站并网后电力系统安全稳定运行的要求。The output power of photovoltaic power generators are quite intermittent and fluctuate,whose characteristics are quite different from the traditional generators.These characteristics would bring up a big problem on the tie-line fault location when connecting to power system.This manuscript proposed a fault location method based on the differential equation algorithm.Firstly,the transient process is established through solving the differential equation.Then,the measured voltage and current are refined through second order Butterworth low pass filter.By using the fault voltage re-constructing method,the correctness and rapidity of the iterative calculation results of fault distance can be promoted.The simulation results demonstrate that the better performance of the proposed fault location method than the traditional methods,which can better effectively meet the safety requirements when large-scale photovoltaic power station is connected to power system.

关 键 词：光伏 故障定位 微分方程算法 电压重构 仿真分析 

分 类 号：TK51[动力工程及工程热物理—热能工程] TM933[电气工程—电力电子与电力传动]