low-frequency oscillation 中文意思是什麼

low-frequency oscillation 解釋
低頻振蕩
  • low : adj 1 低的；淺的，矮的。 low flight 低飛。 a low temperature 低溫。 low tide [water] 低潮。 The g...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • oscillation : n. 1. 【物理學】振蕩，擺動，振動；振幅。2. 動搖，猶豫，仿徨。3. 蹣跚。4. 【無線電】發雜音。
  1. In audio, a very low frequency oscillation often resulting from a positive feedback path in an amplifier system

    在音響設備中出現的振蕩頻率極低的低頻振蕩，常因放大系統的正反饋迴路引起。
  2. Digital simulations reveal many valuable characteristics of the power system low frequency oscillation. the limit of conventional analysis and the appearance of new technique such as wams together with the advance of the nonlinear theory, require a new method for oscillation research of power grid, which can combine small and large disturbances analysis effectively

    論文指出，由於傳統小信號穩定分析方法的局限性，及動態監測設備和非線性理論等新技術與理論的迅速發展，有必要研究新的振蕩分析方法，以更加有效地揭示互聯系統小擾動、大擾動后的振蕩機理，並研究相應的控制策略。
  3. There are five parts are as follows : in part one, the concept of switching function is introduced first to establish the nonlinear mathematical model of the induction motor variable frequency speed adjustment system which is fed by a sine pulse width modulated ( spwm ) inverter and takes the effect of the main magnetic circuit saturation into consideration, then the low frequency oscillation of the system is simulated according to the model. next, from the view point of energy conversion of the inverter - induction system, a criterion for the low frequency oscillation is proposed to determine whether the system is in low frequency oscillation which is judged by whether the interval of the negative current component of the inverter input current is more than 1 / fc ( fc is the carrier wave frequency of the inverter ) or not

    首先引入開關函數概念，建立了正弦脈寬調制（ spwm ）逆變器供電異步電動機，考慮主磁路飽和時的變頻調速系統整體數學模型，模擬系統的低頻振蕩；其次從逆變器-異步電動機系統能量轉換角度出發，提出通過檢測逆變器輸入電流中負電流的間隔時間是否大於1 / f _ c （ f _ c為逆變器載波頻率）來判定系統是否出現低頻振蕩；最後的實驗結果驗證了系統低頻振蕩建模和判據的實用性和正確性。
  4. According to these theories we know the reason of the emergence of low frequency oscillation is lacking positive damping even appearing negative damping. this problem can be classified as dynamic stability

    從而得出，電力系統低頻振蕩是由於系統正阻尼不足甚至產生負阻尼而引起的，可以將其歸類為動態穩定問題。
  5. Through the deep study of f. d. demello dynamic model of electromechanical transition and synchronous generator theory, we proposed a new control strategy of excitation device that can eliminate the negative - damping phenomenon, which is directly against the cause of producing negative - damping represented as low frequency oscillation in the system

    通過深入研究f . d . demello機電暫態的動力學模型以及同步發電機理論，針對系統產生負阻尼即低頻振蕩的原因，我們提出了一種新的可消除負阻尼現象的勵磁控制策略。
  6. Finally, the rules used to design the induction motor and set the inverter v / f curve are summarized to improve the stability of the system movement in the forth part of the dissertation, three measures are brought forward to eliminate the system low frequency oscillation. the first measure adopts pulse based dead time compensation to suppress the oscillation. as second measure, considering the motor and inverter as an integration, the discontinuous space vector modulated strategy named dpwm3 is proposed for the first time to suppress the oscillation

    措施一是在總結常用死區補償方法的基礎上，提出脈沖為基礎的死區時間補償法（ pbdtc ）對死沈陽工業大學博士學位論文區進行補償，抑制系統的低頻振蕩;措施二是從逆變器與電機的機電一體化配合更加完善的角度，首次提出採用不連續空間矢量調制策略dpwm抑制系統的低頻振蕩;措施三是通過對系統中電機參數的調節，達到抑制系統低頻振蕩的目的;最後進行了實驗驗證。
  7. First a diagnostic analysis is carried out to research the frequency modulation effect that the el - nino and la - nina events has on atmospheric low - frequency oscillation ( lfo ) in the mid - high latitudes

    首先用診斷的方法，研究了el - nino和la - nina事件對中高緯大氣低頻振蕩的調頻作用。
  8. Afer presenting the classify and development of excitation, the way of designing power system stabilizer is proposed. in recent years, flexible ac transmission system attracts more and more people in academe and it presents a new effective method to damp the low frequency oscillation

    在介紹了勵磁方式的分類及發展之後，提出了附加勵磁控制設計的原則和方法；基於電力電子技術發展起來的靈活交流輸電技術近年來引起了學術界的廣泛關注，為抑制低頻振蕩提供了新的有效手段。
  9. In addition the h. kantz method is applied to analyze the time series of the motor current, the maximal lyapunov exponent calculation is realized, the criterion for the motor chaos is brought forward, the existence of chaotic phenomenon in the induction motor is verified by the characteristic exponents, which proves theoretically that the chaotic movement is one of the reasons that results in the low frequency oscillation of the induction motor system

    應用h . kantz方法對電機電流信號的時間序列分析，實現了最大李亞普諾夫指數的具體演算法，提出了電機出現混沌運動的判定根據，通過特徵指數驗證了異步電動機現象的存在，從理論上說明混沌運動是異步電動機系統產生低頻振蕩的原因之一。第三部分深入研究了系統低頻振蕩的主要影響因素。
  10. In the course of the low phase noise research, by integrating many aspects, using recent accomplishments, i come up with my method and theory, that by comprehending and controlling subcircuit of oscillator ' s resonator, can let us know exactly their working states. using this method and theory, combining the vco circuit of this subject, i deduce and demonstrate particularly the reason of low frequency oscillation, and come up with the measure of avoiding it. this makes design and producing vcos can avoid the disturbing of low frequency oscillation, and improve the features of vcos. at later process of debugging vco, using this method makes the vco achieves very good working state

    在低相噪研究中，綜合了各方面的情況，運用了當今低相噪vco的研究成果，並提出了自己的對諧振電路結構進行總體把握，從而準確得知電路的工作狀態的思想和理論。運用此方法，在論文中結合本vco電路拓撲結構，詳細推導和論證了低頻振蕩產生的原因，並提出了避免發生低頻振蕩的措施。使低相噪vco的設計及調試能免於低頻振蕩的干擾，從而有利於提高vco的各項指標。
  11. By means of eigen - analysis, this paper presented the careful research for the damping characteristic of low frequency oscillation in power system

    本文基於特徵值分析法，對電力系統低頻振蕩的阻尼特性問題進行了深入的研究。
  12. At the same time, this paper gived a great deal of simulation research for the total damping of system and the damping of electromechanical mode of the system using a useful tool in power system - ssat ( small signal analysis tool ). the conclusions provide the important reference for the suppression of low frequency oscillation and stable operation in power system

    並利用一種有效的電力系統專用工具? ssat （ smallsignalanalysistool ）對系統總阻尼以及系統的機電模式阻尼問題進行了大量的模擬研究。所得結論對于電力系統低頻振蕩的抑制以及電力系統穩定運行具有重要的參考價值。
  13. The dynamic simulating system used to do the research of governor control had been established by the device. the dynamic simulating tests of gahc used on steam turbine and hydro turbine had been done with the device. the tests were three phases short circuit, restoring synchronous operation and restraining low frequency oscillation in three - machines system

    利用該裝置對gahc在汽輪發電機和水輪發電機上的控制進行了以下動模實驗：單機無窮大系統中三相短路故障實驗和發電機發生失步故障后的再同步實驗、三機無窮大系統中抑制低頻振蕩的動模實驗。
  14. This paper carry out power system post - stability analysis with eurostag. this paper determine the state after low frequency oscillation according to the relation between oscillation frequency of low frequency oscillation and eigen value of small signal analysis, which is derived from a great deal of simulation projects. cai xiaoling ( power system and its automation ) directed by prof

    利用eurostag進行電力系統后穩定分析，針對低頻振蕩引起的后穩定問題，通過大量模擬研究了小擾動特徵值分析結果和大擾動振蕩頻率之間的關系，並據此判斷系統發生低頻振蕩失穩后的狀態，為將來進行后穩定后續分析打好基礎。
  15. The angle measurement technology based on gps is introduced briefly. simulation with matlab and psasp, and the validity of prony method based on wide - area measurement through gps for power system low frequency oscillation is shown in this paper. 3

    簡要介紹了基於gps的功角測量技術和prony分析方法，提出利用基於廣域測量的prony方法分析電力系統低頻振蕩的思想，並利用psasp和matlab工具大量的模擬計算驗證了基於gps廣域測量系統的prony方法在研究低頻振蕩問題上的有效性。
  16. The power spectral analysis is performed for daily 500hpa height field data in the mid - high latitudes of the northern hemisphere from 1950 to 1996. the results show that : ( 1 ) intensity of low - frequency oscillation in winter is stronger than that in summer

    應用1950 - 1996年北半球中高緯逐日500hpa高度場資料進行功率譜分析，得出： （ 1 ）夏季低頻振蕩較弱，冬季低頻振蕩較強。
  17. ( 6 ) the results of the stream function field of quasi - resonance three waves transforming with time evolving make sure further that the low - frequency oscillation exists in extratropical latitude, which has greater corresponding relationship with the wave oscillation obtained from the combination of the basic flow, the number of three waves and amplitude

    （ 6 ）在準共振三波流函數場隨時間變化的試驗結果中，進一步證實了中高緯大氣存在較好的低頻振蕩，且與相應的基流、三波波數和振幅組合所得的波動振蕩有較好的對應關系。
  18. Lfo low frequency oscillation

    低頻振蕩信號
  19. Power system is a complex dynamic system. this paper concentrates on the research of power system low frequency oscillation based on angle measurement technology

    電力系統是一個復雜的動態系統，其振蕩穩定問題一直是電力系統研究的熱點問題。
  20. And the pss is utilized to damp the low frequency oscillation in power system of chongqing three gorges water conservancy and electric power co. this method was proved to be effective in practice

    結合三峽水利電力公司電網的具體情況採用了pss來抑制系統的低頻振蕩，經實踐證明效果顯著。
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