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相关概念视频

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 Voltages01:30

Three-Phase Voltages

223
A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...
223
Voltage Doubler Circuit01:23

Voltage Doubler Circuit

534
A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
534
Secondary Distribution01:25

Secondary Distribution

83
Secondary distribution systems provide electrical energy at the utilization voltage levels from distribution transformers to customer meters. Typical secondary voltages in the United States include 120/240 V for residential use, 208Y/120 V for residential and commercial use, and 480Y/277 V for industrial and high-rise commercial use.
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
83
The Delta-to-Delta Circuit01:17

The Delta-to-Delta Circuit

585
In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
585

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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稳定电压源逆变器用于核设施中的敏感负载.

Marwa M Mousa1,2, Khalid F A Hussein3, Z Matter4

  • 1Electrical Engineering Department, Faculty of Engineering, Al-Azhar University, Cairo, Egypt. marwamousa78@gmail.com.

Scientific reports
|July 4, 2024
PubMed
概括

本研究介绍了光伏系统的稳定单相电压源逆变器,以确保敏感负载的纯正弦输出电压. 新的设计显著降低了总波扭曲 (THD) 并提高了效率.

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科学领域:

  • 电气工程 电气工程
  • 电力电子 电力电子 电力电子
  • 可再生能源系统可再生能源系统

背景情况:

  • 敏感负载,特别是在核设施中,需要高度稳定和纯正弦电压.
  • 现有的电压源逆变器往往难以满足严格的波扭曲和稳定性要求.
  • 光伏 (PV) 系统需要可靠的电源调节,以供应敏感的电气设备.

研究的目的:

  • 为稳定单相电压源逆变器提出了一种新的设计.
  • 为了实现光伏系统的最小总波扭曲 (THD) 的纯正正弦输出电压.
  • 为了确保敏感负载的稳定电压大小和频率,无论负载阻抗的变化.

主要方法:

  • 使用了一个H桥配置与隔热门双极晶体管 (IGBT).
  • 实施了一个控制系统,包括数字信号处理器 (DSP) 和微控制器,用于和声取消.
  • 使用脉冲宽度调制 (PWM) 与反系统测量输出电压波形,THD,频率和振幅.

主要成果:

  • 证明了电压幅度和频率的稳定,无论负载阻抗如何.
  • 达到0.5%以下的总波扭曲 (THD),接近于零.
  • 报告说,切换损失大大减少,平均逆变器效率超过95%.

结论:

  • 拟议的逆变器设计有效地提供适合敏感负载的纯正弦输出电压.
  • 先进的控制系统确保了高稳定性和最小的波扭曲,提高了功率质量.
  • 该设计提供高效率和低损耗,使其成为关键应用中的光伏系统的可行解决方案.