摘要
基于行波固有频率的故障定位方法无需检测行波波头即可实现故障定位,该方法应用于多分支输电线路时,由于线路结构复杂,使得固有频率主成分的提取存在较大困难。提出一种基于行波固有频率的多分支输电线路故障定位方法。首先,应用VMD算法将故障行波信号分解为多个模态分量,经MUSIC算法得到相应模态下的频谱图,从各模态频谱图中提取出反应故障距离的固有频率主成分。然后,根据各端测点的计算故障距离与已知线路长度之间的关系,确定出故障区间,进而得到最终的故障距离。EMTDC仿真结果表明,该方法能够克服频谱混叠对固有频率主成分提取的影响,并可以准确判定故障区间,定位结果不受故障距离、故障类型以及故障电阻的影响,具有良好的适应性和较高的定位精度。
The fault location method based on traveling wave natural frequencies can accurately de-termine the fault position without identifying the intial-traveling wave front. Due to the complexity of power network structure , it is difficult to extract the dominant component of traveling wave natural frequency for multi-terminal transmission lines. A fault location method for multi-terminal transmission lines based on traveling wave natural frequency was presented in this paper. Firstly, the fault signal was decomposed into multiple modal components by VMD algorithm, and the spectrums of corresponding modes were obtained by using MUSIC algorithm. Then, the natural frequency components reflecting fault distances were extracted from the spectrums. According to the relationship between calculated fault distance and the line length, the fault interval was identified, and the final fault distance was determined accurately. EMTDC simulation results show that this method can effectively overcome the influence of spectrum aliasing, and identify the fault interval quickly. Moreover, the results of fault location are not affected by fault position, fault type and fault resistance. Thus, the presented method possesses better adaptability and higher precision.
出处
《电力科学与技术学报》
CAS
北大核心
2016年第3期65-72,共8页
Journal of Electric Power Science And Technology
基金
中央高校基本科研业务费专项资金(2014xs74)
