CN112327111A - 局部放电信号的去噪方法 - Google Patents
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Abstract
本申请涉及一种局部放电信号的去噪方法。该方法包括:通过获取局部放电信号;将所述局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号,基于145阶FIR数字滤波器可以提高运算速度,快速的识别出高斯白噪声,提高了局部放电信号的去噪效率。
Description
技术领域
本申请涉及信号处理技术领域,特别是涉及一种局部放电信号的去噪方法。
背景技术
高压设备绝缘劣化将会导致严重的短路故障,所以保障高压设备的安全,必须有效检测绝缘劣化。局部放电是高压设备绝缘劣化的主要表现形式,对其进行检测是评估高压设备绝缘状态的有效方法,局部放电信号是一种特高频信号,具有宽带或超宽带频谱,可以利用外置的特高频天线来检测,但是,局部放电信号检测现场电磁干扰严重,会导致较弱的局部放电信号淹没于严重的背景噪声中。
而目前的去噪方法有:采用基于广义S变换获取局部放电信号的二维模时频矩阵,采用区域最大能量法提取周期性窄带干扰的特征量,并通过矩阵逆向分离将周期性窄带干扰去除,在去除周期性窄带干扰后采用奇异值分解的方法抑制局部放电信号中的高斯白噪声等,但是利用奇异值分解的方法抑制局部放电信号中的高斯白噪声将非常复杂,因为奇异值分解计算过程中会涉及到大量的矩阵运算,对硬件的要求很高,且运算速度慢,导致局部放电信号的去噪效率低。
发明内容
基于此,有必要针对上述技术问题,提供一种能够提高局部放电信号的去噪效率的局部放电信号的去噪方法。
一种局部放电信号的去噪方法,所述方法包括:
获取局部放电信号;
将所述局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号。
在其中一个实施例中,所述145阶FIR数字滤波器由73个乘法器、144个加法器和144个移位寄存器构成。
在其中一个实施例中,所述145阶FIR数字滤波器的系统传递函数为:
其中,M是滤波器的阶数,br是145阶FIR滤波器的抽头系数,r是抽头系数的下标,H(z)是145阶FIR数字滤波器的系统传递函数。
在其中一个实施例中,所述145阶FIR滤波器的抽头系数包括b0~b144,分别为:
上述局部放电信号的去噪方法,通过获取局部放电信号;将所述局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号,基于145阶FIR数字滤波器可以提高运算速度,快速的识别出高斯白噪声,提高了局部放电信号的去噪效率。
附图说明
图1为一个实施例中局部放电信号的去噪方法的流程示意图;
图2为一个实施例中145阶FIR滤波器的145个抽头系数的值;
图3为一个实施例中145阶FIR滤波器的归一化幅频特性曲线;
图4为一个实施例中145阶FIR滤波器的归一化相频特性曲线;
图5为一个实施例中145阶FIR滤波器的处理流程示意图;
图6为一个实施例中仿真的局部放电信号示意图;
图7为一个实施例中对仿真的局部放电信号添加高斯白噪声后的示意图;
图8为一个实施例中通过145阶FIR滤波器进行去噪后的信号示意图;
图9为一个实施例中通过现有技术进行去噪后的信号示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本申请进行进一步详细说明。应当理解,此处描述的具体实施例仅仅用以解释本申请,并不用于限定本申请。
在一个实施例中,如图1所示,提供了一种局部放电信号的去噪方法,包括以下步骤:
步骤S220,获取局部放电信号。
其中,局部放电信号可以是通过局部放电检测仪进行高压设备绝缘状态检测时,从高压设备处采集到的信号。
步骤S260,将局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号。
其中,145阶FIR数字滤波器的系统传递函数为:
其中,M是滤波器的阶数,br是145阶FIR滤波器的抽头系数,r是抽头系数的下标,H(z)是145阶FIR数字滤波器的系统传递函数。
如图2所示,145阶FIR滤波器的抽头系数包括b0~b144,分别为:
145阶FIR数字滤波器由73个乘法器、144个加法器和144个移位寄存器构成,该145阶FIR滤波器的幅频特性如图3所示,该145阶FIR滤波器的相频特性如图4所示,计算速度为73个时钟周期,利用数字电路实现时,可以减少一倍的抽头,即减少一倍的硬件结构,硬件资源消耗不多,降低了硬件成本,且运算速度快。如图5所示,将去窄带干扰后的局部放电信号(即图5中标注的x(n))输入由73个乘法器、144个加法器和144个移位寄存器构成的145阶FIR数字滤波器进行信号处理,去除高斯白噪声,输出去噪后的局部放电信号,即,图5中标注的y(n)。
上述局部放电信号的去噪方法,通过获取局部放电信号;将局部放电信号进行周期性窄带干扰去除,获得去窄带干扰后的局部放电信号;将去窄带干扰后的局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号,基于145阶FIR数字滤波器可以提高运算速度,快速的识别出高斯白噪声,提高了局部放电信号的去噪效率。
在一个实施中,将局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号的步骤包括:将局部放电信号进行周期性窄带干扰去除,获得去窄带干扰后的局部放电信号;将去窄带干扰后的局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号。
其中,可以采用基于广义S变换获取局部放电信号的二维模时频矩阵,采用区域最大能量法提取周期性窄带干扰的特征量,并通过矩阵逆向分离将周期性窄带干扰去除。周期性窄带干扰主要是由电力系统的高次谐波、无线通信等产生干扰信号。
为了检验本发明方法对局部放电信号的去噪效果,仿真了如图6所示的一个指数衰减信号和一个双指数振荡衰减信号。该信号添加高斯白噪声后形成信噪比3dB时的加噪信号,如图7所示。将如图7所示的加噪信号经过本申请的局部放电信号的去噪方法中的145阶FIR数字滤波器进行去除高斯白噪声,输出去噪后的信号,如图8所示。可以看出,通过本申请局部放电信号的去噪方法中的145阶FIR数字滤波器,进行滤波后的输出对噪声抑制明显,且可以明显辨别出指数衰减信号和双指数振荡衰减信号的波形。
利用现有技术小波去噪对如图7所示的信号进行处理,其输出结果如图9所示。从图9可以看出,该方法同样对噪声抑制明显,且可以明显辨别出指数衰减信号和双指数振荡衰减信号的波形。对比图8和图9可以看出,图9对噪声的高频成分衰减较多,波形比较干净,但是对局部放电信号的波形分辨能力和图8是差不多的。同时,对信噪比的改善能力图8和图9也是差不多。通过图8和图9的对比,可以看出,本申请的去噪性能和其它方法是近似的,但是本申请的硬件实现复杂度和计算速度比其它方法具有优势。
应该理解的是,虽然图1的流程图中的各个步骤按照箭头的指示依次显示,但是这些步骤并不是必然按照箭头指示的顺序依次执行。除非本文中有明确的说明,这些步骤的执行并没有严格的顺序限制,这些步骤可以以其它的顺序执行。而且,图1中的至少一部分步骤可以包括多个子步骤或者多个阶段,这些子步骤或者阶段并不必然是在同一时刻执行完成,而是可以在不同的时刻执行,这些子步骤或者阶段的执行顺序也不必然是依次进行,而是可以与其它步骤或者其它步骤的子步骤或者阶段的至少一部分轮流或者交替地执行。
以上实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本申请构思的前提下,还可以做出若干变形和改进,这些都属于本申请的保护范围。因此,本申请专利的保护范围应以所附权利要求为准。
Claims (4)
1.一种局部放电信号的去噪方法,其特征在于,所述方法包括:
获取局部放电信号;
将所述局部放电信号输入145阶FIR数字滤波器去除高斯白噪声,获得去噪后的局部放电信号。
2.根据权利要求1所述的方法,其特征在于,所述145阶FIR数字滤波器由73个乘法器、144个加法器和144个移位寄存器构成。
4.根据权利要求3所述的方法,其特征在于,所述145阶FIR滤波器的抽头系数包括b0~b144,分别为:
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101282322A (zh) * | 2008-03-05 | 2008-10-08 | 中科院嘉兴中心微系统所分中心 | 一种应用于无线中程传感网物理层的内插数字滤波器装置 |
CN104539258A (zh) * | 2014-12-25 | 2015-04-22 | 电子科技大学 | 一种低功耗数字fir滤波器 |
CN106936406A (zh) * | 2017-03-10 | 2017-07-07 | 南京大学 | 一种5并行快速有限冲击响应滤波器的实现 |
CN111147410A (zh) * | 2019-12-31 | 2020-05-12 | 南京信息职业技术学院 | 一种低信噪比下数字基带信号均衡方法 |
CN111239565A (zh) * | 2020-02-26 | 2020-06-05 | 国网陕西省电力公司电力科学研究院 | 基于分层式去噪模型的充油套管局部放电脉冲信号处理方法及系统 |
-
2020
- 2020-10-21 CN CN202011131217.8A patent/CN112327111A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101282322A (zh) * | 2008-03-05 | 2008-10-08 | 中科院嘉兴中心微系统所分中心 | 一种应用于无线中程传感网物理层的内插数字滤波器装置 |
CN104539258A (zh) * | 2014-12-25 | 2015-04-22 | 电子科技大学 | 一种低功耗数字fir滤波器 |
CN106936406A (zh) * | 2017-03-10 | 2017-07-07 | 南京大学 | 一种5并行快速有限冲击响应滤波器的实现 |
CN111147410A (zh) * | 2019-12-31 | 2020-05-12 | 南京信息职业技术学院 | 一种低信噪比下数字基带信号均衡方法 |
CN111239565A (zh) * | 2020-02-26 | 2020-06-05 | 国网陕西省电力公司电力科学研究院 | 基于分层式去噪模型的充油套管局部放电脉冲信号处理方法及系统 |
Non-Patent Citations (3)
Title |
---|
周润景等编著: "《数字信号处理的SYSTEMVIEW设计与分析》", 31 January 2008, 北京航空航天大学出版社 * |
汪昺粲等: "局部放电超声信号监测及数字降噪", 《机械制造与自动化》 * |
黄新波等: "箱式变电站智能监测装置设计", 《中国电力》 * |
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