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Application of α-β-γ filtering to real-time atmosphere methane concentration measurement

Chinese Physics B 2006年第6期15卷 1379-1383页

作者：阚瑞峰刘文清张玉钧刘建国陈东王敏 Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

A real time α-β-γ filtering technique is applied to the monitoring of atmosphere CH4 based on a tunable diode laser spectrum system operating at 1.654μm. This technique is developed for improving the sensitivity and precision of CH4 concentration measurement with slow concentration change. The effectiveness of this technique is evaluated by performing CH4 concentration measurement and using it to monitor the varying methane level in the atmosphere. It was proved that signal noise ratio enhancement factor is 4.25. The comparison between this filter and moving average is also included in this article. It indicates the advantage of the α-β-γ real time filter.

关键词： tunable diode laser absorption spectroscopy multi-pass cell harmonic detection

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Absorption measurements for highly sensitive diode laser of CO2 near 1.3μm at room temperature

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Chinese Physics B 2005年第3期14卷 482-486页

作者：邵杰张为俊高晓明宁利新袁怿谦 LaboratoryofAtmosphericOptics AnhuiInstituteofOpticsandFineMechanicsChineseAcademyofSciencesHefei230031China EnvironmentalSpectroscopyLaboratory AnhuiInstituteofOpticsandFineMechanicsChineseAcademyofSciencesHefei230031China

Fifteen new absorption lines were observed when studing CO2 absorption spectroscopy by wavelength modulation technique with a distributed feedback lase. The overtone spectra of CO2 around 1.3μm and the corresponding spectral parameters (i.e. positions, intensities, self-broadening coefficients) are presented. The intensity of the weakest line detected is 2.25163×-27cm-1/(molecule·cm-2) at the pressure of 667Pa, with a corresponding absorption of 3.88×10-8.

关键词： absorption spectroscopy wavelength modulation harmonic detection

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Lifting Wavelet Transform Based Adaptive Filter for Active Power Filters

Lifting Wavelet Transform Based Adaptive Filter for Active P...

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第二十七届中国控制会议

作者： Liu Hui,Liu Guohai,Shen Yue School of Electrical and Information Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,P.R.China

This paper presents a new harmonic measurement scheme on lifting wavelet transform based adaptive filter（LWTAF） for active power filters（APFs） .As one of methods to build second-generation wavelets,lifting wavelet transform（LWT） can be easy to achieve in time domain for its original bit location *** could lessen calculation complexity and depress course due to its particular structure,compared with first generation wavelet algorithm（WT） .Then the performance of the LWTAF is studied and the harmonics detection working schematic of LWTAF is *** can abstract harmonic components effective and follow up the transient component more quickly than adaptive filter（AF） .The simulation results validate the conclusion above.

关键词： Active power filters (APFs) harmonic detection Lifting wavelet transform based adaptive filter (LWTAF)

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harmonic Current Adaptive Predictable Based on Variable Step Size LMS Algorithm Used in APF

Harmonic Current Adaptive Predictable Based on Variable Step...

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第32届中国控制与决策会议

作者： Xifeng Guo Haoran Jiang Di Zheng Wenzhuo Cong Shiwei Jiang Shenyang Jianzhu University of School of information and control engineering

In the process of harmonic current detection of active power filter,considering dynamic response ability and the drawback of static accuracy in the traditional fixed step size LMS detection method,proposed a improved adaptive variable step LMS harmonic current detection *** the history error data to regulate the step *** the algorithm was used to detect the harmonic current in *** results of simulation show that,the method is more advanced both in detection accuracy and dynamic response,and has a fast dynamic response and high detection accuracy.

关键词： Active Power Filter Adaptive prediction algorithm Variable step size algorithm harmonic detection

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An Overview on harmonic Suppression

An Overview on Harmonic Suppression

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第30届中国控制与决策会议

作者： Youjie Ma Faping Hong Xuesong Zhou Zhiqiang Gao Key Research Laboratory for Control Theory ＆ Applications in Complicated Systems Tianjin University of Technology

due to the use of a large number of power electronic equipment in the power system and the increase of nonlinear load, harmonic power quality problems become more and more complex. As one of the most important contents in the research of power quality, the harmonic of power system attracts more and more attention. This paper expounds the main reasons and the harms of harmonic, and analyses some methods of harmonic detection and suppression. Hybrid active power filter is an important way to control harmonic and improve power quality, According to the current research of harmonic suppression at home and abroad, the main development trend of harmonic suppression is analysis.

关键词： power system harmonics harmonic detection harmonic suppression hybrid active power filter

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