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相关概念视频

Generator Voltage Control01:21

Generator Voltage Control

638
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, use...
638
Turbine-Governor Control01:17

Turbine-Governor Control

933
Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
933
Wind Turbine Machine Models01:24

Wind Turbine Machine Models

562
In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is...
562
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

750
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...
750
Load-frequency control01:28

Load-frequency control

623
Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
623
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

487
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
487

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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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使用基于人工神经网络的非线性后退控制器提高风力驱动PMSG的性能.

Abdelfattah Dani1, Zineb Mekrini1, Mhamed El Mrabet1

  • 1Industrial Systems Engineering and Energy Conversion Team, FSTT, Abdelmalek Essaadi University, Tetouan, Morocco.

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概括

本研究介绍了使用永磁同步发电机 (PMSG) 的风能转换系统 (WECS) 的混合控制策略. 与传统方法相比,这种新的方法提高了能量收集,并减少了电流/扭矩波纹.

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科学领域:

  • 电气工程 电气工程
  • 可再生能源系统可再生能源系统
  • 控制理论 控制理论

背景情况:

  • 越来越多的风能需求需要先进的控制策略来有效发电.
  • 永磁同步发电机 (PMSG) 是现代风能转换系统 (WECS) 的关键组件.
  • 优化对WECS的控制对于电网稳定性和最大限度地提高能源产量至关重要.

研究的目的:

  • 为基于PMSG的WECS提出一种新的混合控制策略.
  • 在波动的风速下提高能源采集效率.
  • 为了减少电流和扭矩的波动,并改善PMSG电流的总波扭曲 (THD).

主要方法:

  • 一种混合控制策略,结合非线性倒退方法和人工神经网络.
  • 对于系统稳定性的利亚普诺夫理论.
  • 在 MATLAB/Simulink 中实现和模拟以验证性能.

主要成果:

  • 电磁扭矩波动比率显著减少,从32.95%降至19.43%.
  • 定子电流的总波扭曲率 (THD) 从20.87%大幅降低至14.88%.
  • 与传统的面向现场控制 (FOC) 相比,其表现优越.

结论:

  • 拟议的混合控制策略为WECS提供了更好的可靠性和效率.
  • 这种先进的控制方法有效地减轻PMSG电流中的波纹和THD.
  • 这些发现支持在现实世界WECS中实际应用这一策略.