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相关概念视频

Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

209
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...
209
Generator Voltage Control01:21

Generator Voltage Control

139
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,...
139
Multimachine Stability01:25

Multimachine Stability

150
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:
150
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

135
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...
135
Control of Power Flow01:30

Control of Power Flow

263
There are several methods to control power flow in power systems:
263
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

367
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
367

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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
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基于虚拟同步机战略的光伏电源注入控制

Miguel Albornoz1, Jaime Rohten2, José Espinoza1

  • 1Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
概括
此摘要是机器生成的。

光伏电源注入现在可以支持电网电压和频率稳定. 一个新的虚拟同步机器控制策略可以提高功率质量,而不需要昂贵的储能系统.

关键词:
太阳能发电输入电源的使用方法同步转换器是一个同步转换器.虚拟同步机是一个虚拟的同步机.

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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
  • 电力质量 电力质量 电力质量

背景情况:

  • 随着光伏 (PV) 集成的增加,由于变化和缺乏惯性,电网电力质量面临挑战.
  • 太阳能光伏源,特别是在配电系统和微电网中,会导致电压和频率的偏差.
  • 现有的电网形成控制通常需要昂贵的电压源或储能.

研究的目的:

  • 使用虚拟同步机 (VSM) 控制来设计光伏注入系统.
  • 为电网提供电压和频率支持.
  • 为了提高功率质量,而无需额外的硬件成本.

主要方法:

  • 实施了对光伏系统的VSM控制策略.
  • 适应最大功率点跟踪 (MPPT) 用于电压参考生成.
  • 集成下降频率控制器用于主动电源注入.
  • 通过模拟和实验测试验证了战略.

主要成果:

  • 证明了成功的光伏电源注入,同时提供电压支持.
  • 展示了有效的频率调节能力.
  • 证实了VSM控制战略在提高电网稳定性方面的可行性.

结论:

  • 拟议的VSM控制策略有效地支持电网电压和频率.
  • 这种方法可以提高光伏源的电力质量,而不会增加系统成本.
  • 该研究验证了整合可再生能源的成本有效解决方案.