基于MVDR聚焦波束形成的变压器局部放电源的定向仿真研究  

Research of transformer partial discharge source orientation simulation based on MVDR focused beamforming

作　　者：祁帅涛 郭海涛[1] 王睿[1] 高鹏飞[1] 杜喆[1] 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电测与仪表》2015年第4期112-117,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(41076060)

摘　　要：局部放电是电力变压器绝缘劣化的主要原因,研究局部放电定位对提高电网的安全运行至关重要,研究局部放电的定位首先要明确局部放电的定向。文章提出了一种基于最小方差信号无畸变响应(MVDR)聚焦波束形成的方法,对变压器单个局部放电源定向进行仿真研究,将MVDR方位估计与聚焦波束形成相结合,在定向方面与常规的聚焦波束形成(CBF)相比较,分辨率升高,旁瓣级有明显降低,"混叠"效应的影响更小,该方法还具有抗电磁干扰能力强、系统稳定性好、能够进行现场实时监测等优点。最后通过对该方法的空间谱仿真证明其正确性和有效性。Partial discharge（ PD） is the main inducement of insulation deterioration for power transformers, so the lo-cation of partial discharge is crucial to the safe operation of power grid .Location of partial discharge should first clarify the orientation of partial discharge.This paper presents a focused beamforming method based on the minimum variance distortion-less response signal （ MVDR） to simulate the location of single partial discharge source of transformer, the integration of MVDR orientation estimation and focused beamforming has higher resolution and lower side-lobe level than the conventional focusing beam forming （ CBF） in locating and the aliasing effect can be reduced.The present method also has strong ability of anti-electromagnetic interference, good system stability and it can carry out real-time monitoring.In the end of this paper, the correctness and validity of the present method has been proved by spatial spectrum simulation.

关 键 词：局部放电定向 最小方差信号无畸变响应 聚焦波束形成 近场 

分 类 号：TM41[电气工程—电器]