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相关概念视频

Control of Power Flow01:30

Control of Power Flow

316
There are several methods to control power flow in power systems:
316
Load-frequency control01:28

Load-frequency control

257
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...
257
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

206
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
206
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

286
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
286
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

178
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
178
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

148
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
148

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相关实验视频

Updated: Sep 12, 2025

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

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Published on: February 14, 2025

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基于阻抗成型的稳定控制方法,用于直流微电网的前补偿.

Xiaojuan Zhang1,2, Bo Jing3, Yuan Wang4

  • 1College of Mechanical Engineering, Xijing University, Xi'an, China. hansi-321@163.com.

Scientific reports
|August 8, 2025
PubMed
概括
此摘要是机器生成的。

一种新的前控制方法通过塑造储能单元阻抗来稳定直流微电网. 这种方法可以防止充电期间的振荡不稳定,确保可靠的系统运行和最小的电压偏差.

关键词:
恒定功率单元是一个常量功率单元.料前期补偿的补偿金.阻抗成形 阻抗成形负阻抗特征 负阻抗特征稳定的稳定性 稳定的稳定性

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科学领域:

  • 电气工程 电气工程
  • 控制系统 控制系统
  • 电力电子 电力电子 电力电子

背景情况:

  • 在DC微电网中的双向转换器在充电时表现出负阻抗.
  • 这种负阻抗特征可以降低系统稳定性并导致振荡不稳定.
  • 现有的方法可能无法充分解决DC微电网储能中的稳定性问题.

研究的目的:

  • 提出和验证一种新的前补偿控制方法,以提高直流微电网的稳定性.
  • 为了减轻充电过程中储能单元负阻抗特征引起的振荡不稳定性.
  • 为了确保稳定的系统运行,并最大限度地减少DC微电网中的稳定状态电压偏差.

主要方法:

  • 实施基于阻抗成型的前补偿控制策略.
  • 在当前前向前输入循环中设计一个传输函数,以确保总线电压如下.
  • 选择一个合适的时间常数来实现所需的端口阻抗特性 (在振荡频率附近的正电阻,在低频率下负电阻).

主要成果:

  • 拟议的控制方法有效地重塑了储能单元的端口阻抗.
  • 模拟和半物理测试证实了系统稳定性边际的增强.
  • 实现了稳定的系统运行,稳定状态电压偏差最小.

结论:

  • 进料前置补偿控制方法成功解决了DC微电网充电中的负阻抗问题.
  • 这种方法确保了系统的稳定性,并提高了整体性能.
  • 这种方法为DC微电网中稳定的储能集成提供了可行的解决方案.