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相关概念视频

Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

334
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
334
Multimachine Stability01:25

Multimachine Stability

235
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
235
Generator Voltage Control01:21

Generator Voltage Control

248
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
248
The Swing Equation01:21

The Swing Equation

708
The Swing Equation is a fundamental tool in power system dynamics, especially for analyzing the behavior of generating units like three-phase synchronous generators. This equation emerges from applying Newton's second law to the rotor of a generator, encompassing factors such as inertia, angular acceleration, and the interplay between mechanical and electrical torques.
In a steady-state operation, the mechanical torque (Τm) supplied to the generator is balanced by the electrical torque...
708
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

150
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
150
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

240
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
240

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相关实验视频

Updated: Sep 18, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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使用电力分析和德宾沃森测试来检测同步发电机的脱节检测.

R A Mahmoud1, E S Elwakil2

  • 1Department of Electrical Power and Machines Engineering (PME), College of Engineering Science and Technology, Misr University for Science and Technology (MUST), 6th of October City, Giza, Egypt. ragab.mahmoud@must.edu.eg.

Scientific reports
|June 20, 2025
PubMed
概括

本研究引入了一种新的计算方法,用于检测同步发电机 (SGs) 中的发电机出步 (OOS) 条件. 先进的算法迅速识别不稳定性,防止进一步的电力网络干扰.

关键词:
德宾 沃森 统计 统计失去了同步的时间.出了步骤,走出了步骤同步发生器同步发生器不稳定的动力摇摆不稳定

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科学领域:

  • 电气工程 电气工程
  • 电力系统保护保护 电力系统保护
  • 计算智能是一种计算智能.

背景情况:

  • 同步发电机 (SG) 的分流故障可能会导致电力输出的大幅波动,导致与电网失去同步.
  • 诊断电力质量的不稳定性和区分同步和异步发电机运行对于电网稳定性至关重要.
  • 现有的保护策略可能无法充分预测或迅速检测故障后的异步 (OOS) 条件.

研究的目的:

  • 开发和验证一个智能中继策略,用于预测和检测发电机的OOS情况.
  • 在OOS事件期间识别关键电气参数的突然变化,以准确诊断故障.
  • 确保保护继电器的快速触发,以防止严重的电网干扰.

主要方法:

  • 利用计算技术作为智能继电器的基础来检测OOS事件.
  • 开发了一种保护策略,用于监测OOS签名的相位电压,电流,主动功率,反应功率和功率角度.
  • 使用电力系统模型与ATP中的真实组件数据验证了该方法,并使用MATLAB进行算法分析.

主要成果:

  • 保护策略成功识别了OOS事件,触发了触发发生器断路器的保护继电器.
  • 在稳定的同步条件下,系统保持不活跃,表明了选择性.
  • 在第二次杆滑事件发生之前,OOS条件迅速宣布,并且在稳定的功率波动期间,算法证明了强大.

结论:

  • 拟议的计算技术提供了一种有效和强大的方法来检测发电机出步条件.
  • 该策略提供保护冗余性,并准确估计不稳定时间和频率.
  • 这种智能中继方法通过快速准确地检测发电机不稳定性来提高电力系统的可靠性.