time harmonics 中文意思是什麼
time harmonics
解釋
時間諧波-
Firstly, in spherical coordinate system, the sovp formulation for the time - harmonic electromagnetic fields of the current dipole in conductive infinite - space is derived, using reciprocity theorem and transforming relations between special functions. then, selecting appropriate coordinate system, using superposition principle, the boundary - value problem of modified magnetic vector potential on the problem of a time - harmonic current dipole in spherical conductor is solved and analytical solution is obtained. finally, by means of the addition formulas of legendre polynomial and spherical harmonics function of degree n and order 1, the analytical solution in spherical coordinate system specially located is transformed into that in spherical coordinate system arbitrarily located
首先利用特殊函數間的轉化關系和互易定理推導得到了無限大導體空間中球坐標下時諧電流元電磁場的二階矢量位形式：然後利用疊加原理，選擇合適坐標系，求解了導體球中時諧電流元的修正磁矢量位邊值問題，得到了問題的解析解；最後依據不同坐標系下電磁場解的轉化原理，藉助勒讓德多項式和n次1階球諧函數的加法公式，將坐標系特殊安放時的電磁場解析解變換到坐標系一般安放時的解析解，給出了球內電場和球外磁場的並矢格林函數。 -
The time harmonics can be considered as voltages of higher frequencies applied to the windings.
時間諧波可以看作是施加在繞組上的較高頻率的電壓。 -
The way of taking one nth out of capacitor ' s the first harmonic capacitive reactance as its nth harmonic impedance is verified whit the data from tang7c. according to the approximately estimating method, the first harmonic impedance of 220kv system is calculated. on the basis of the models, this paper gives the harmonic equivalent circuit of substation and gives the b ( n ) function of the harmonic time n. when the capacitors has different combination, b ( n ) ' s value will also change, with the inputting local measurement data, the paper studies the series and parallel resonance at the substation, and deduces that the reason the capacitor ' s fuse of tang6c is frequently interrupted is that its capacitor current contains a large number of 5th harmonics, and that the reason the discharging pt of tang7c capacitor being exploded is also that the 7th and 9th harmonic currents are amplified
據此，對該站進行了串聯諧振分析和並聯諧振分析，並結合測試數據和有關變電站的運行記錄，指出了導致該站電容器湯6c頻繁燒保險的主要原因是5次諧波電流含量偏高，引起湯7c放電pt爆炸也是因為7次和9次諧波電流被放大。針對這些導致湯陰變電站補償電容器故障的原因，提出了相應的諧波治理措施，包括針對湯6c電容器5次諧波電流含量偏高的原因，提出了停運湯6c電容器或者通過把湯sc電容器的部分容量併入湯6c電容器（湯sc其餘部分停運）以增加湯6c諧波承受能力的措施;針對# 2變低壓側7次和9次諧波電流被放大的現象，提出了在湯7c電容器上加裝一定百分比的串聯電抗器的措施。 -
According to the analysis and compare of all the methods of harmonics analysis in the power system, this paper introduces an adaptive sampling harmonic analysis method adapted to realization of precise real time harmonic analysis
為了更好的滿足實時性和精確性兩方面的要求，本文採用了一種自適應調整采樣率的諧波分析法。 -
Traditional energy meter can cause errors under the condition of harmonics due to its structural characters, and at the same time harmonic loads take in foundational power and send out harmonic power. this paper proposes a new way and realizes accuracy and fair energy metering
傳統的電能表在諧波存在下由於自身的結構特性會產生誤差，就此進行分析提出了新的電能計量方法，應用虛擬儀器技術實現了準確、公平、合理的電能計量。 -
The researching intention of this paper is to establish a high precise and real time harmonics measuring system
本論文研究的方向是建立一個高精度實時諧波測量系統。 -
As a real time harmonics measuring device, it is important that it can real time measure various harmonics accurately
作為一種實時的諧波測量系統要求既能精確的測量各次諧波，又具有較高的實時性。 -
The subject inducts digital time division technology ( pwm ), which is more advantageous at the accuracy and the predigest of hardware than simulant multiplication. what they call measuring power energy reasonably is that measuting except harmonics power energy fed back power. yet it realizes reasonable measurement of power energy which measures by base wave ac parameters method base on digital time division
本課題引入了數字時分割（ pwm ）脈寬調制技術，在測量的準確性、硬體電路的簡化等方面都比模擬乘法器具有較高的優越性。所謂合理的計量電能，就是不計非線性負載回饋給電網的負的諧波電能，而採用基於數字時分割的基波交流參數測量的方法，真正實現了電能的合理計量。 -
Non - periodical time function consists of time harmonics with continuous frequency spectrum
非周期時變由連續頻譜之弦波所構成。 -
Active power filter ( apf ) is an advanced power electronic device ， which can be used for compensating harmonics, reactive power and negative sequence current. compared with conventional compensation devices, active power filter has advantages of real - time and accuracy
有源電力濾波器是一種新型諧波、無功補償裝置，和傳統的補償裝置相比，有源電力濾波器具有很大的優勢：可以對諧波、無功以及負序電流實現實時、準確的補償。 -
At the same time, with the rapid development of electric power industry, stabile power quality issues, such as voltage fluctuation and flicker, frequency fluctuation, harmonics, have increasingly captured considerable attention from utility companies and their customers
同時，隨著電力工業的快速發展，穩態電能質量問題如電壓波動、頻率波動、諧波等，已經引起了足夠的重視。 -
The paper, for the harmonics detection method used in power system, presents an sampling method based on frequency multiplication phase - locked. through phase - locked loop to track the power wave, which not only reduces the affect of spectrum leakage to the harmonics analysis, but also realizes quick. accurate and, real - time measurement
本論文主要針對電力系統中採用的諧波測量方法而提出的一種基於鎖相倍頻採集方法，通過鎖相環對電力波形進行實時跟蹤，既解決了頻譜泄漏對諧波測量精度的影響，又實現了快速的，準確的，實時性的測量。 -
From theoretical analysis, we know the existing demodulation methods have limitations as following : one is that the subtraction of the two signals frequencies will display as the result of demodulation when we demodulate two time - domain adding signals without modulating information ( fault information ) ; the other one is that aliasing phenomenon will occur as a result of getting absolute value, detection or square in the process of generalized demodulation analysis, such phenomenon will result in some superfluous frequency composition on the frequency spectrum, which will puzzle the detec tion of mechanical vibration. if the sampling frequency is selected from a suitable range, the aliasing phenomenon will be avoided ; the last one is that aliasing frequencies will be produced in zoom demodulation analysis because this algorithm cannot employ digital low - pass filtering to avert the folding frequencies of higher harmonics in the process of zoom sub - sampling
現有的解調分析方法存在以下三種局限性：將不包括調制信息（故障信息）的兩時域相加信號，也以其頻率之差作為解調信號而解出；廣義檢波濾波解調分析中，由於取絕對值、檢波或平方過程可能產生混頻效應，在解調譜中表現為無法分析的頻率成分，並由此推導出避免這種混頻現象的采樣頻率的選取范圍，從根本上避免此類誤診斷的產生；幾種細化解調分析新演算法中，因為無法在細化分析的選抽時進行數字低通濾波，有可能會出現調制頻率的高次諧波成分發生頻率混疊而反折到低頻部分的現象。 -
The pictures of probabilistic characteristic in both sides of impendence matching balance transformers are drawn, and probabilistic density figures are also given. the simulation model of shaoshan 4 electrical tractor is raised, at the same time facing the restriction of probabilistic method, the paper raised that using monte carlo simulation absorbed harmonics currents of the model of electrical tractor and simulated the superposition of low harmonics currents. through compared with real time data, the monte carlo simulation can be confirmed, and the breakthrough point of restriction of using probabilistic method is discussed
為了有效模擬機車在運行中所產生的諧波電流，本文在matlab的平臺空間中建立了韶山4型電力機車的模擬模型，導入到matlab運算程序中，對低次諧波電流疊加進行模擬，從而證實了蒙特卡羅模擬法仍然是目前較為可靠可行的方法，同時討論了在電牽引系統中針對低次多諧波源疊加使用基於中心極限定理的概率分析方法必須使用相關參數進行修正，即需要和電力機車的帶電運行方式有機的結合在一起。 -
Equipment of power quality dynamic compensation control realization can be either digital or analogical. the advantage of digital compensation control ( dcc ) is that it can compensate harmonics to a precision level and is independent of the surrounding environment. but dcc need high - speed real - time chips to deal with digital signal processing, so it has high price
電能質量動態補償裝置的控制是影響電能質量動態補償裝置的性能的重要因數，電能質量動態補償裝置的諧波補償主要有數字補償控制和模擬補償控制兩種，數字補償的優點是可以對電網諧波的補償達到很精確的程度，不容易受到外界運行環境的影響，但是要求運行速度很高的實時數字信號處理器，因此造價較高，模擬補償控制對硬體要求比較嚴格。 -
Apf control realization can be either digital or analogical. the advantage of digital compensating control ( dcc ) is that it can compensate harmonics to a precision level and is independent of the surrounding environment. but dcc needs high - speed real - time chips to deal with digital signal processing, so has high price ; analog compensating control ( acc ) demands hardware very rigidly
數字補償控制的優點是可以對電網諧波的補償達到很精確的程度，不容易受運行環境改變的影響，但是要求運算速度很高的實時數字信號處理晶元，因此造價較高；模擬補償控制對硬體的要求比較嚴格。 -
In addition, according to the characteristics of wavelet packet transform and that of conjugate quadrature filter bank, we bring forward the ameliorated arithmetic of wavelet packet. the amplitude of time - varying harmonics can be measured accurately through the ameliorated arithmetic
另外我們結合小波包分解和正交鏡像對稱濾波器的特點，提出了小波包的改進演算法，利用該演算法可對時變諧波信號的幅值進行比較精確的分析。 -
In chapter 3, a new method for real - time harmonics cancellation based on frequency shifting principle is deduced
第三章提出了一種基於移頻思想的實時諧波消去演算法。 -
Fault feature in stator current is extracted by singularity detection of signals with half - complex wavelet transform and it can be helpful to the real - time detection of motor fault. harmonics caused by the fault of motor is detected accurately with real - time harmonics cancellation method. steady state current and starting current in stator are analyzed with real - time harmonics cancellation method and the improved harmonic wavelet separately, after that the feature component of rotor fault can be detected successfully
採用半復小波變換對電機定子電流進行奇異性檢測，提取故障突變信號，有助於電機故障的實時診斷；通過實時諧波消去法檢測定子故障引起的高次諧波電流；採用改進的實時諧波消去法精確提取電機穩態電流中的轉子斷條故障特徵分量；為了進一步提高轉子斷條故障診斷精度，利用改進的諧波小波對電機起動電流進行時頻分析，提取轉子斷條故障特徵。 -
According to the present actual underground power system which neutral point is grounded through arc suppression coil in many supper big shaft, the development history and present situation of synthetic protection system used in hv flameproof switchgear are reviewed, and on the basis of analyzing the problems existed in high voltage flameproof switchgear, the selective leakage protective method based on the detecting harmonic direction of zero sequence current as well as the value of zero sequence voltage is proposed in this paper, and at the same time, harmonics extracting schematic and transforming circuit are also designed
本文深入系統地研究了基於intel80c196kb單片機控制的6kv防爆開關綜合保護系統，主要內容如下：針對大型及特大型礦井供電系統中性點普遍採用消弧線圈接地方式的現狀，回顧了國內外礦用高壓防爆開關保護系統的發展歷史，分析了目前國內高壓饋電開關保護系統所存在的問題，提出了「基於零序電壓基波啟動，五次諧波功率方向比較」的選擇性漏電保護原理，設計了相應的五次諧波提取電路和功率方向鑒別電路。
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