| A Simple Approach to Determine Noise Frequency of Boiler Drum Level |
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| 作者姓名： | 余南华 苏明 |
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| 作者单位： | Key Lab.of Power Machinery and Eng.of MOE Shanghai Jiaotong Univ.，Shanghai 200030 China，Key Lab.of Power Machinery and Eng.of MOE，Shanghai Jiaotong Univ.，Shanghai 200030 China |
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| 基金项目： | NationalNaturalScienceFoundationofChina(No.5997022)andGEEdisonAwardRe-searchGrant(No.200310) |
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| 摘 要： | IntroductionSince much of emergency shutdowns arecaused by poor drum level control in power plant,stable drum level control is critical to economic op-eration of any power plant steam generator sys-tem.The control gain setting must be reduced inorder not to respond excessively to thc drum levelerrors1].Due to the uncertainty of operating con-dition point,surface wave of drum water is stimu-lated to fluctuate frequently and subsequently tomake oscillatory disturbance signal,which is com-bined …
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| 文章编号： | 1007-1172（2006）01-0066-05 |
| 收稿时间： | 2005-09-20 |
A Simple Approach to Determine Noise Frequency of Boiler Drum Level |
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| YU Nan-hua,SU Ming.A Simple Approach to Determine Noise Frequency of Boiler Drum Level[J].Journal of Shanghai Jiaotong university,2006,11(1):66-70. |
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| Authors: | YU Nan-hua SU Ming |
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| Abstract: | This paper proposed a simple approach to determine noise frequency of boiler drum level in order to improve control performance. Based on analysis of uncertainty of drum level, the redundant oscillation component of signal, noise is ascribed to the surface wave of drum water. According to the characteristic of surface wave, a new method was proposed to determine noise's frequency band. By gradually removing the lowest frequency component of signal, the variance of remained component is calculated and observed. An apparent turning point was found and the corresponding critical frequcncy was determined. With this result a low-pass filter was designed to separate noise component. Finally validation is conducted by comparing the proposed method and conventional ones. Results show the accuracy and simpleness of the proposed method. |
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| Keywords: | boiler drum level noise cutoff frequency low-pass filter |
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