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

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。

Research of Transformer Partial Discharge Source Orientation Simulation Based on MVDR Focused Beamforming

Partial discharge(PD)is the main inducement of insulation deterioration for power transformers, so the location 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 EMC (Electro Magnetic Compatibility), 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.