摘要
目前的配网故障测距算法大多依靠短路迭代计算或模拟大量故障选取最匹配的故障点来实现测距功能,该类方法计算繁琐,且容易得到伪故障点,为此提出了一种基于稀疏电压幅值量测的配网故障测距方法:将故障点的正序注入电流等效为故障区域两端节点的虚拟注入电流;利用支路追加法推导了节点阻抗矩阵所含特性,证明了将节点电压方程元素取幅值的可行性,以及测点分布需要满足的条件;利用压缩感知理论求解欠定的节点电压方程,定位故障区域;求取故障区域两端节点电压和等效阻抗,实现故障测距。文中方法对测量数据无严格同步要求,所需采样频率为4 k Hz,所需故障后数据时间窗长较短(故障后25 ms)。基于33节点的多电源配电系统的仿真数据表明,文中方法仅需7个测点,即可有效定位故障区域并实现故障测距,且受故障类型、过渡电阻、负荷变化影响较小,具有一定的抗噪声能力。
Most of current distribution network fault location algorithms rely on short circuit iteration calculation or a large number of simulation with different faults to select the most matched fault points for realizing ranging function.This kind of method is cumbersome and likely to get false fault points,so a fault location method based on sparse voltage amplitude measurement is proposed.The positive sequence current injected at fault point is equivalent to the virtual injected currents at the two ends of the fault zone,and the characteristics of impedance matrix are derived with branch addition method.Taking the amplitudes of the elements in node voltage equation is proved valid and the condition of the measured point is explained.The node voltage equation is solved with compressed sensing theory to locate the fault zone.The node voltages and equivalent impedances at the two ends of the fault zone are obtained to realize ranging function.The proposed algorithm has no strict synchronization requirements for the measured data and the required data time window is short(25 ms after faults).The required sampling frequency is 4 kHz.The simulation data based on a 33-node multi-distributed power distribution system show that the proposed method only needs 7 measuring points to effectively locate the fault zone and achieve distance measurement,not affected by fault type,transition resistance and load change,and has certain anti-noise ability.
作者
贾科
董雄鹰
李论
冯涛
毕天姝
JIA Ke;DONG Xiongying;LI Lun;FENG Tao;BI Tianshu(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)
出处
《电网技术》
EI
CSCD
北大核心
2020年第3期835-845,共11页
Power System Technology
基金
国家重点研发计划资助项目(2018YFB0904104)
国家自然科学基金资助项目(51725702,51777071).
关键词
配电系统
故障测距
压缩感知
节点阻抗矩阵
电压幅值
distribution system
fault location
compressed sensing
node impedance matrix
voltage amplitude
