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Load-frequency control01:28

Load-frequency control

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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...
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Multimachine Stability01:25

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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.
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Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

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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.
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Control System Problem01:21

Control System Problem

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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.
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Maximum Power Transfer

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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.
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Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

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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.
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Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization
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SDN-controlled multi-user NOMA-OFDM VLC system based on a resource allocation algorithm.

Yongxin Wang, Jianhang Li, Chengju Hu

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    Summary
    This summary is machine-generated.

    We developed a new resource allocation algorithm for visible light communication systems. This method improves performance by allocating bits based on user demand, not just signal strength, outperforming older methods.

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    Area of Science:

    • Optoelectronics and Photonics
    • Wireless Communication Technologies
    • Network Resource Management

    Background:

    • Visible Light Communication (VLC) systems offer high-speed wireless data transmission using LEDs.
    • Non-Orthogonal Multiple Access (NOMA) enhances spectral efficiency in shared communication channels.
    • Resource Allocation Algorithms (RAAs) are crucial for optimizing performance in multi-user systems.

    Purpose of the Study:

    • To introduce a novel Resource Allocation Algorithm (RAA) for multi-user NOMA-OFDM VLC systems.
    • To address the limitation of conventional RAAs that prioritize users with stronger channel gains.
    • To enhance system fairness and adaptability to dynamic user demands and channel conditions.

    Main Methods:

    • Developed a novel RAA for NOMA-OFDM VLC systems.
    • Designed a software-defined-network (SDN)-controlled VLC system with real-time signal generation.
    • Validated the RAA using a Field-Programmable Gate Array (FPGA)-based transmitter in experimental setups.

    Main Results:

    • The proposed RAA dynamically allocates bits based on the ratio of allocated to demanded bits, avoiding strong-user bias.
    • Experimental results with a two-user NOMA-OFDM system achieved throughputs of 115-191 Mbit/s.
    • The system demonstrated dynamic adaptation to changing data demands and user channel responses.

    Conclusions:

    • The novel RAA significantly outperforms conventional RAAs in NOMA-OFDM VLC systems.
    • Performance benefits are consistent across varying data demands, receiving angles, and user distances.
    • The proposed algorithm offers a more equitable and robust resource allocation strategy for VLC networks.