數(shù)據(jù)采集外文翻譯(文件)
【正文】 irst measured the measured signal, the sampling interval period T Δ T = T/N (N for week of sampling points), Thus the count value determined timer,Use timing interrupt way realization synchronous sampling. The advantage of this method is no hardware synchronous circuit, simple structure .This topic will be the eventual realization of access to embedded systems，the realization of the power measurement and monitoring,monitoring system to meet the electricity network,intelligence requirement,it promote the development of remote monitoring services,bringing a certain degree of effectiveness.On the fundamental reactive current and harmonic current detection, there are mainly 2 ways: First, the instantaneous reactive power theory based method, the second is based on adaptive cancellation addition, there are other nonmainstream approach, such as fast Fourier transform method, wavelet transform.Instantaneous power theory based on the method of offensive principles are: a threephase current detection and load phase voltage A, the coordinate transformation, twophase stationary coordinate system the current value, calculate the instantaneous active and instantaneous reactive power ip iq,then after coordinate transformation, threephase fundamental active current, with the final load current minus the fundamental current, active power and harmonic currents are fundamental iah, ibhi, ich.From:Principles of Data Acquisitio 數(shù)據(jù)采集目前，我國高校公寓管理正在向著正規(guī)化、市場化發(fā)展，在不斷提高學生方便用電的同時，用電事故頻有發(fā)生，雖然部分高校公寓已經(jīng)安裝了電能計量監(jiān)控系統(tǒng)，但這些系統(tǒng)普遍存在著監(jiān)控程度低、計費精度不高、電費均分、網(wǎng)絡程度低等諸多端。數(shù)據(jù)采 集技術廣泛引用在各個領域。采集的數(shù)據(jù)大多是瞬時值，也可是某段時間內(nèi)的一個特征值。數(shù)據(jù)采集含義很廣，包抱對面狀連續(xù)物理量的采集。其次,總線兼容型數(shù)據(jù)采集插件的數(shù)量不斷增大,與個人計算機兼容的數(shù)據(jù)采集系統(tǒng)的數(shù)量也在增加。本文采用基于加窗插值的FFT算法分析系統(tǒng)諧波，提高了各項電能質量參數(shù)的準確性。信號經(jīng)過互感器、運放送入A/D轉換器，利用DSP的多通道緩沖串口（McBSP）與A/D相連，進行數(shù)據(jù)的采集和運算。六通道同時采樣，同時轉換，分時傳輸，有效地減少了由于采樣時間不同而產(chǎn)生的相位誤差。非同步采樣的影響：在實際測量時很難做到同步采樣和整數(shù)個周期截斷，因此出現(xiàn)了影響測量準確性的頻譜泄漏問題。但是FF
試題試卷相關推薦
鄂ICP備17016276號-1