摘要
通过分析影响零序有功分量选线判据有效性的原因,研究了一种新的基于零序瞬时有功的选线方法。该方法以线路瞬时功率的直流分量作为零序有功判据,具备信号幅值大、处理简单、抗干扰能力强的优点;针对线路不平衡电流对零序有功方向辨别存在的不利影响,采用零序电流变化量与零序电压变化量之间的相角作为辅助判据的解决方法,并提出了一种计算该相角的数值算法。理论分析和仿真研究证明了所提方法的正确性。
By analyzing the causes of ineffectivity in fault-line-selection problem while adopting zero-sequence active component method,a novel fault-line-selection method based on zero-sequence active power is researched in this paper.The new method calculates zero-sequence active power by identifying the DC component in feeder instantaneous power,which possesses the superiority of large signal,easy processing and high anti-interference capability.For solving the unfavorable influence in active power direction recognizing caused by unbalanced current in feeder line,an auxiliary criterion via judging the phasor angle between zero-sequence current variation and zero-sequence voltage variation is adopted in the paper.An algorithm is further presented to calculate the phase or angle.Theoretical analysis and simulation results verify the validity of proposed method.
出处
《电测与仪表》
北大核心
2010年第7期24-29,共6页
Electrical Measurement & Instrumentation
关键词
单相接地选线
零序有功
瞬时功率
不平衡电流
算法
single line grounding fault-line-selection
zero-sequence active power
instantaneous power
unbalanced current
algorithm
