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电站锅炉声学测温中时间延迟估计的仿真研究.pdf

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第 27卷 第 11期 中 国 电 机 工 程 学 报 Vol.27 No.11 Apr. 2007 2007年 4月 Proceedings of the CSEE ?2007 Chin.Soc.for Elec.Eng. 文章编号:0258-8013 (2007) 11-0057-05 中图分类号:TK31 文献标识码:A 学科分类号:470?20 电站锅炉声学测温中时间延迟估计的仿真研究 沈国清 1,安连锁 1,姜根山 1,梁亚园 2,张达勋 2 (1. 电站设备状态监测与控制教育部重点实验室(华北电力大学),北京市 昌平区 102206; 2. 张家口发电厂,河北省 张家口市 075133) Simulation of Time Delay Estimation in Acoustic Pyrometry in Power Plant Boiler SHEN Guo-qing1, AN Lian-suo1, JIANG Gen-shan1, LIANG Ya-yuan2, ZHANG Da-xun2 (1.Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education,Changping District, Beijing 102206, China; 2. Zhangjiakou Power Plant, Zhangjiakou 075133, Hebei Province, China) ABSTRACT: In order to acquire the accurate transmitted time of sound wave in power plant furnace in acoustic pyrometry, the time delay estimation (TDE) of weak sound signal under the condition of strong noise is studied. Spectral analysis and statistic analysis of the background noise in furnace, acquired from a power plant boiler in China, are done. The result shows that the background noise in furnace is dominated by the combustion noise with center frequency from 250 to 1000 Hz and with Gaussian-like distribution. The disadvantages of some traditional methods of TDE are shown. A new TDE method based on high-order cumulant is given. The acquired background noise in furnace is added to signal with exponential distribution. One hundred Monte-Carlo simulation tests of TDE are done based on the ML cross-correlation method and high-order cumulant method respectively under different signal noise ratio (SNR). The result shows that the influence of correlated Gaussian noise can be restrained from the non-Gaussian signal based on the third-order cumulant method even under poor SNR. It is useful to the measurement of transmitted time of sound wave in acoustic pyrometry and to the sound source location of fou
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