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power systems
相关语句
  电力系统
     STUDY ON THE INTEGRATED COMPENSATION OF HARMONIC, REACTIVE AND NEGATIVE SEQUENCE CURRENTS IN POWER SYSTEMS
     电力系统谐波、无功和负序电流综合补偿的研究
短句来源
     Study on Emergency Control of Power Systems Based on On-Line Dynamic Equivalence and Energy Function Method
     基于在线动态等值和能量函数法的电力系统暂态稳定控制研究
短句来源
     Hybrid Modeling and Analysis of Power Systems
     电力系统混杂建模与分析
短句来源
     Research on Reliability Assessment Models and Algorithms of Power Systems Based on Soft Computing Theory
     基于软计算理论的电力系统可靠性评估模型与算法研究
短句来源
     Research on Reliability Assessment of Bulk Power Systems Based on Sensitivity Analysis and a Corrective Model
     大电力系统可靠性评估的灵敏度分析及其校正措施模型研究
短句来源
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  电力系统
     STUDY ON THE INTEGRATED COMPENSATION OF HARMONIC, REACTIVE AND NEGATIVE SEQUENCE CURRENTS IN POWER SYSTEMS
     电力系统谐波、无功和负序电流综合补偿的研究
短句来源
     Study on Emergency Control of Power Systems Based on On-Line Dynamic Equivalence and Energy Function Method
     基于在线动态等值和能量函数法的电力系统暂态稳定控制研究
短句来源
     Hybrid Modeling and Analysis of Power Systems
     电力系统混杂建模与分析
短句来源
     Research on Reliability Assessment Models and Algorithms of Power Systems Based on Soft Computing Theory
     基于软计算理论的电力系统可靠性评估模型与算法研究
短句来源
     Research on Reliability Assessment of Bulk Power Systems Based on Sensitivity Analysis and a Corrective Model
     大电力系统可靠性评估的灵敏度分析及其校正措施模型研究
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  “power systems”译为未确定词的双语例句
     Models and Algorithms on Optimum Maintenance Scheduling of Railway Power Systems
     铁路牵引供电系统维修计划优化模型与算法
短句来源
     Study on Voltage Security and Preventive Control of Power Systems in Degregualted Enviroments
     市场环境下的电力系统电压安全及预防控制研究
短句来源
     Discussion on Some Measures to Make Full Use of Water Resources in planning of Irrigation and Water Power Systems
     灌溉发电系统规划中充分利用水资源的若干措施
短句来源
     On-Line Control for Frequency of Interconnected Power Systems and Power Flow on Tielines
     互联系统频率及联络线功率的在线控制
短句来源
     Voltage and Reactive Power Control for Power Systems
     电力系统电压与无功控制
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  power systems
The method can be used not only to calculate FSIQ in the complex power systems with simple or multiple faults, but also to analyze and evaluate the performance of the protective relays and automatic devices based on FSIQ.
      
Simulation results show that the proposed method can improve the transient stability of power systems more efficiently than nonlinear optimal excitation control.
      
The quadratic eigenvalue problem in electric power systems
      
The application of the quadratic eigenvalue problem in electrical power systems is reviewed.
      
Self-organizing extrapolation controllers for power systems: History and prospects
      
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In this paper, the method of excitation regulation according to voltage deviation with a high coefficient of amplification is investigated, with an analysis of stability and instability regions, a study of the excellent effect of such regulation in improving the stability of electric power systems, and a discussion of the restrictions on its application imposed by the time constants of the exciter and the regulator.The effects of introducing into the regulating system the first and the second derivatives...

In this paper, the method of excitation regulation according to voltage deviation with a high coefficient of amplification is investigated, with an analysis of stability and instability regions, a study of the excellent effect of such regulation in improving the stability of electric power systems, and a discussion of the restrictions on its application imposed by the time constants of the exciter and the regulator.The effects of introducing into the regulating system the first and the second derivatives of voltage and current as regulating factors in addition to voltage deviation are also analyzed. Finally, several regulation systems are recommended for exciters with Smaller and larger time constants.

本文研究了按电压偏差特大放大系数调节励磁方式的某些规律,分析了它的振荡区和稳定区的特点及其在提高系统稳定性上的优异作用;讨论了励磁机和调节器时间常数对此种调节方式的制约条件。 文中还在按电压偏差特大放大系数调节的基础上,对引入电压一次、二次导数和引入电流一次、二次导数调节的作用与调节品质进行了分析,指出了适合于具有较小和较大励磁机时间常数情况下的几种调节方式。

The author attempts to derive the transmission loss formula for a rather complicated power system having multiple load points. He has analyzed thoroughly systems of various patterns possibly obtained from network reduction, and has succeeded in expressing the total transmission loss as a sum o?those resulting from the transfer of incremental power from each source to the various load points. As a result of this, it will be possible to coordinate the incremental transmission loss with the incremental...

The author attempts to derive the transmission loss formula for a rather complicated power system having multiple load points. He has analyzed thoroughly systems of various patterns possibly obtained from network reduction, and has succeeded in expressing the total transmission loss as a sum o?those resulting from the transfer of incremental power from each source to the various load points. As a result of this, it will be possible to coordinate the incremental transmission loss with the incremental production cost individually at each source.The method of writing out directly from the network configuration the transmission loss formula is also given. An example is given for evaluating its accuracy.

作者企图从动力系统最基本的功率传送方程出发,来推导具有多个负荷中心的复杂动力系统的网损计算公式。他对等值简化后可能出现的各种结构的系统,进行了透彻的分析研究,并把系统总的网损增量最终分解为从各个电站向各个负荷中心传送负荷增量所产生的附加网损之和。由于得到这样的结果,便有可能把网损校正工作分别在各个电站上独立进行。 文中还说明了按照网络结构图形,直接写出这网损校正公式的方法,并举例说明这公式的准确程度。

Under-frequency load-shedding relays are usually installed in a district power system at the receiving end of a transmission line to restore the normal operation of generators after isolation from the main system, causing active power deficiency. Such relays are usually set to operate when the frequency falls below 48 cycles per second. However, practical operating experiences have shown that, if such power deficiency exceeds a certain limit, then the frequency may not fall below 48 cycles...

Under-frequency load-shedding relays are usually installed in a district power system at the receiving end of a transmission line to restore the normal operation of generators after isolation from the main system, causing active power deficiency. Such relays are usually set to operate when the frequency falls below 48 cycles per second. However, practical operating experiences have shown that, if such power deficiency exceeds a certain limit, then the frequency may not fall below 48 cycles per second, so that under-fretjuency relays cannot operate. In this paper, the various formulae to determine the drops of frequency and voltage are investigated, the effects of various load characteristics are discussed, and it is concluded that the voltage drop will seriously affect the drop of frequency. It is recommended that three-phase under-voltage relays -with time delay should be used in combination with under-frequency relays in a district power system with ordinary parameters, when "active power deficiency" exceeds 30-40% after isolation from the main system. The reasons for different frequency and voltage drops under various abnormal conditions in a district power system are also analyzed.

受端电力系统中一般装有低周率自动解列装置或自动减负荷装置,以便在送电线路解列后,根据有功功率缺额和周率下降情况,迅速切除一部份负荷,以恢复地区发电机正常运行。但是,实际运行经验指出:若“有功功率缺额”超过一定程度,则周率反而不能下降到48周/秒以下,因此低周率继电器不能起到应有的保护作用。本文讨论了决定周率和电压变化的公式,分析了不同负荷特性的影响,并指出了电压下降是造成周率变化不同的主要原因。通过对于典型受端系统在不同条件下周率和电压下降的计算分析,作者建议:一般受端系统在解列后“有功功率缺额”超过30~40%者,就应考虑装设三相低电压自动解列或减负荷装置,以迅速切除负荷,确保安全供电。文中还分析了同一受端系统解列后周率和电压下降有时不同的原因。

 
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