基于匹配滤波法的超高频局部放电信号检测

在强电磁干扰环境下准确获取局部放电信号是目前研究的难点。超高频局部放电过程的频散现象会影响波形匹配法消除干扰的效果，因此文中基于频谱最优匹配原则构造滤波器，以使超高频局部放电信号的能量得到增强，从而获得最大的信噪比。文中还采用改进的粒子群算法提高了优化计算的速度和可靠性。实验和分析结果均表明，在强干扰背景下，频谱最优匹配滤波法对白噪干扰和周期性窄带干扰均有较好的消噪效果，并可保持超高频局部放电脉冲的波形、幅值和极性信息。

Ultra High-Frequency Partial Discharge Detection Based on Matched Filter Algorithm

It is very difficult to make on-line sensitive ultra high-frequency(UHF) partial discharge(PD) detection in the environment with strong electromagnetic interference. The dispersion phenomenon of UHF PD process will deteriorate the effect of eliminating interference by wave matching method,so it is proposed to construct filter according to the principle of optimal mathcing of frequency spectrum to make the energy of UHF PD signal intensified,thus the maximum signal-to-noise ratio(SNR) is acquired. By use of improved particle swarm optimization(PSO) ,the speed and reliability of optimal calculation are improved. Results from experiments and analysis show that under the background of strong interference the proposed method has obvious predominance of rejecting white noise and periodic narrow-band noise,while the information of UHF PD pulse such as waveform,amplitude and polarity can be preserved.