hvdc 中文意思是什麼

hvdc 解釋
高壓直流輸電子工業
  1. Depend on the comprehensive analysis and study of the structure, principle, and exterior characteristic of the motor, through the methods of system modeling and digital simulation analysis, two kind of control device that work for the low voltage ( lvdc ) and the high voltage ( hvdc ) in avigation are researched respectively. point to the control technique of close - loop speed stabilization at a limited adjustment speed range, we bring out the close - loop speed control method that using the rotor position sensor indirectly measure the speed of the motor

    在全面分析了稀土永磁無刷直流電動機的結構特點、工作原理、運行方式以及外部特性的基礎上，通過系統建模和數字模擬分析，分別針對航空低壓直流（ lvdc ）和高壓直流（ hvdc ）兩種電動機構用永磁無刷電動機，在小范圍轉速連續調節下的閉環穩速控制技術進行了詳細理論研究，提出了利用轉子位置傳感器信號間接測量電機轉速進行電機轉速閉環穩速控制的策略。
  2. Commutation failure factors analysis in hvdc transmission system

    直流輸電系統中逆變器換相失敗的因素分析
  3. This paper also studies an hvdc system based on leee fbm, a svc system based on ieee fbm and a statcom system based on ieee fbm. it proves the function of supplementare subsynchronous damping controller ( ssdc ) in the above devices to mitigate ssr. it also analyzes the influence of input signal of ssdc on ssr mitigation, tdeng hvdc as an example

    在psasp小干擾線性化平臺psaspaisst上，對基於ieeefbm的hvdc系統、基於ieeefbm的svc系統和基於ieeefbm的statcom系統分別進行了ssr小干擾穩定分析，驗證了在這些裝置中安裝次同步振蕩阻尼器（ ssdc ）對r的抑制作用，並以hvdc為例，研究了ssdc輸入信號對其抑制ssr的影響。
  4. Transmission losses will be less than 7 percent, significantly less than the losses from conventional 500 - kilovolt ( kv ) high - voltage direct current ( hvdc ) transmission schemes

    電力的傳輸損失將少於7 % ，遠遠低於傳統500千伏高壓直流（ hvdc ）傳輸計劃的損失量。
  5. Hvdc is an abb innovation that transports large power loads over long distances with low losses and minimal environmental impact, requiring just two 500 kilovolt ( kv ) dc power lines to carry the same power load as five alternating current ( ac ) lines

    Hvdc技術是abb的一項創新，在長距離的傳輸中，它傳送大量的電量，而損失很低，而且對環境的影響也達到最小化，只需要兩條500千伏的直流電線就可以運載相當於五條交流電線輸送的電量。
  6. In an ac system with multiple hvdc converters, turbine generators can interact adversely with all the converters through electrical connection, which makes the subsynchronous oscillation more complicated

    並通過對含有多個直流換流站系統的電氣阻尼特性分析，驗證了該指標的有效性。
  7. This simplification principle is the foundation of the following analysis. using the test signal method, a detailed analysis of subsynchronous oscillation for a hvdc system is performed

    （ 3 ）對一個僅含有直流輸電線路的系統，採用復轉矩系數- - - -測試信號法，對其次同步振蕩特性進行了分析。
  8. From the viewpoint of electrical damping, this dissertation focus on the damping analysis of subsynchronous oscillation for different systems, such as hvdc system, hybrid ac / dc system and multiple - converter hvdc system

    目前，直流輸電技術已經在我國得到了廣泛的應用，並且在今後的幾十年中，直流輸電在我國還將有更為廣闊的應用前景。
  9. Torsional interaction exists between hvdc converters and turbine - generators, and negative electrical damping provided by hvdc may cause subsynchronous oscillation ( sso ) that can lead to turbine - generator shaft failure and electrical instability at oscillation frequencies lower than the fundamental system frequency

    高壓直流輸電（ high - voltage - direct - current - - - - hvdc ）系統與臨近同步發電機組之間存在著扭振相互作用， hvdc的電氣負阻尼作用有可能引起機組在次同步頻率范圍的扭轉振蕩。
  10. The elements of the reduced - jacobian matrix are functions of some parameters of the system. for example, effective short ratio, power base ratio, coupling impedance and load flow of the system. for single - infeed hvdc system with a parallel ac line, computer simulations using power system analysis software package ( psasp ) were performed

    用一種簡單的方法可以求得降階雅可比矩陣，由於降階雅可比矩陣的元素都是交直流混合系統中一些參數的代數函數，如有效短路比、功率基準比、連接阻抗和系統潮流等，因此，矩陣的特徵值也與這些參數相關。
  11. Dynamic modeling and nonlinear - decouple control of hvdc light system

    輕型高壓直流輸電系統的動態建模及非線性解耦控制
  12. Through the testing, the parameters of the two controllers are determined. the simulating results under faulty conditions show that the proposed controllers are effective for improving system transient stability and they make the hvdc system can operate with very weak receiving end ac system

    在故障條件下的模擬結果表明，上述兩種控制器均能有效地提高系統的暫態穩定性，而且能使系統穩定運行在受端為極弱交流系統的條件下。
  13. In this paper, a coordinated recovery strategy for multi - infeed hvdc system is proposed

    提出了一種針對多饋入直流輸電系統的協調恢復控制策略。
  14. A method based on the eigenvalue decomposition technique, known as modal analysis of multi - infeed hvdc systems

    最近，一種基於特徵值分解技術的模態分析方法，已用於交直流混合系統的電壓穩定性分析中。
  15. For multi - infeed hvdc systems, when the minimum eigenvalue of the system becomes zero, the voltage stability graph can be plotted effective short circuit ratio as function of coupling impedance

    對于多饋入hvdc系統，在最小特徵值為零的情況下，可以根據這種關系作出有效短路比?連接阻抗圖，即電壓穩定圖。
  16. The simulation results show that, with the proposed coordinated recovery strategy implemented, the recovery performance of the tested multi - infeed hvdc system has been improved a lot when compared with the conventional control strategy "

    該方法更注重直流系統兩端控制間的協調，更注重在直流系統恢復期間對其換流母線電壓的維持。
  17. Based on differential geometric theory, a novel nonlinear modulation strategy for multi - iii infeed hvdc systems to enhance the transient stability of ac system in the presence of large disturbances is presented in this paper

    針對大擾動情形，提出了一種用於改善多機交直流混合電力系統（有多條直流線路落點于其中）暫態穩定性的非線性調制策略。
  18. This dissertation proposes a new approach to nonlinear active and reactive power modulation control design for multi - infeed hvdc systems, which realizes the emergency power support to ac system in the presence of large disturbances occurred in ac system

    將己有的基於線性方法的有功及無功調制策略由單饋入直流輸電系統推廣至多饋入直流輸電系統，並提出一種非線性的有功及無功調制方法。
  19. With the increased use of hvdc transmission systems in power systems, situations have arisen and will be even more frequent in the future, where sigle - infeed hvdc system with a parallel ac line and several hvdc systems are located in close of each other

    隨著hvdc輸電系統在電力系統中投入越來越多，交直流並聯系統和多饋入hvdc系統正在逐漸增多。在這種情況下，交流系統和直流系統，不同的hvdc系統間都將存在相互作用。
  20. This dissertation focuses on the application of the fast controllability of hvdc systems to realize emergency power support to its connected ac system in the presence of large disturbances occurred in ac system, and more emphasis is given to the control strategies concerned with multi - infeed hvdc systems

    利用直流輸電系統的快速可控性，實現對交流輸電系統的緊急功率支援，其本質就是研究在大擾動發生后應對直流系統採取何種控制策略。
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