信道强干扰下特高压换流站监测信号输出降噪  

Noise reduction of monitoring signal output of UHV converter station under strong channel interference

作　　者：李康伟 宋明 刘畅 LI Kangwei;SONG Ming;LIU Chang(Ultra High Voltage Construction Branch,State Grid Corporation of China,Beijing 100052,China)

机构地区：[1]国家电网有限公司特高压建设分公司,北京100052

出　　处：《电子设计工程》2025年第7期136-139,144,共5页Electronic Design Engineering

基　　金：国家电网有限公司科技项目资助(5246XY240015)。

摘　　要：电磁干扰、环境干扰等因素致使特高压换流站监测信号中包含着大量的噪声信息,其会导致信号失真或掩盖有效信号,威胁特高压换流站的稳定运行,故提出信道强干扰下特高压换流站监测信号输出降噪方法。深入分析信道强干扰对监测信号的影响,通过去直流分量与带通滤波器分别剔除背景噪声、频率不符噪声,以此为基础,融合小波变换降噪算法与遗传算法,优化小波变换降噪算法参数,实现监测信号降噪。测试结果显示,应用设计方法后降噪监测信号信噪比为62.59 dB,均方根误差为0.11 dB,充分证实了设计方法监测信号降噪性能更强,有助于保证特高压换流站的稳定运行。Factors such as electromagnetic interference and environmental interference result in a large amount of noise information in the monitoring signal of ultra high voltage converter stations,which can cause signal distortion,mask effective signals,and threaten the stable operation of ultra high voltage converter stations.Therefore,a noise reduction method for the output of ultra high voltage converter station monitoring signals under strong channel interference is proposed.In depth analysis of the impact of strong channel interference on monitoring signals,background noise and frequency mismatch noise are removed by removing DC components and bandpass filters,respectively.Based on this,wavelet transform denoising algorithm and genetic algorithm are integrated to optimize the parameters of wavelet transform denoising algorithm and achieve denoising of monitoring signals.The test results show that after the application of the design method,the signal to noise ratio value of the noise reduction monitoring signal is 62.59 dB,and the root mean square error value is 0.11 dB,which fully confirms that the design method has stronger noise reduction performance in monitoring signals and helps to ensure the stable operation of the ultra high voltage converter station.

关 键 词：特高压换流站 输出降噪 信道强干扰 监测信号 信噪比 

分 类 号：TN02[电子电信—物理电子学]