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相关概念视频

Load-frequency control01:28

Load-frequency control

126
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...
126
Multimachine Stability01:25

Multimachine Stability

141
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:
141
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

95
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
95
Control System Problem01:21

Control System Problem

108
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
108
Maximum Power Transfer01:16

Maximum Power Transfer

231
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
231
Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

646
The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
646

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Updated: Jun 7, 2025

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization
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由SDN控制的多用户NOMA-OFDM VLC系统基于资源分配算法.

Yongxin Wang, Jianhang Li, Chengju Hu

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    概括
    此摘要是机器生成的。

    我们为可见光通信系统开发了一种新的资源分配算法. 这种方法通过根据用户需求分配比特来提高性能,而不仅仅是信号强度,优于旧方法.

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    科学领域:

    • 光电学和光子学的光电子学和光子学.
    • 无线通信技术无线通信技术
    • 网络资源管理 网络资源管理

    背景情况:

    • 可见光通信 (VLC) 系统使用LED提供高速无线数据传输.
    • 非直角多重接入 (NOMA) 提高了共享通信通道的频谱效率.
    • 资源分配算法 (RAA) 对于优化多用户系统的性能至关重要.

    研究的目的:

    • 为多用户NOMA-OFDM VLC系统引入一种新的资源分配算法 (RAA).
    • 解决传统RAA的局限性,优先考虑具有更强通道收益的用户.
    • 增强系统的公平性和适应动态用户需求和道条件的适应性.

    主要方法:

    • 为NOMA-OFDM VLC系统开发了一个新的RAA.
    • 设计了一个软件定义网络 (SDN) 控制的VLC系统,具有实时信号生成.
    • 在实验设置中使用基于场可编程门阵列 (FPGA) 的发射器验证了RAA.

    主要成果:

    • 拟议的RAA基于分配与需求比特的比率动态分配比特,避免强有力的用户偏差.
    • 使用双用户NOMA-OFDM系统的实验结果实现了115-191 Mbit/s的吞吐量.
    • 该系统表现出动态适应不断变化的数据需求和用户道响应.

    结论:

    • 新型RAA在NOMA-OFDM VLC系统中显著优于传统RAA.
    • 性能优势在不同的数据需求,接收角度和用户距离上是一致的.
    • 拟议的算法为VLC网络提供了一个更公平,更强大的资源分配策略.