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Related Concept Videos

Power Factor Correction01:20

Power Factor Correction

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The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
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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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Generator Voltage Control01:21

Generator Voltage Control

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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,...
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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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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...
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Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

74
Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
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Discrete-time Fourier transform01:26

Discrete-time Fourier transform

216
The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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High dynamic-range dimming control for CFMO-OFDM-based VLC systems utilizing a grouped direct current scheme.

Tao Li, Hongyu Chen, Maoren Wang

    Optics Letters
    |December 24, 2024
    PubMed
    Summary

    This study introduces a new dimming control for visible light communication (VLC) using spectrally efficient clipping-free multilayer optical orthogonal frequency division multiplexing (CFMO-OFDM). The novel method enhances dimming range, flexibility, and performance for LED-based systems.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Solid-State Lighting

    Background:

    • Visible Light Communication (VLC) systems leverage Light-Emitting Diodes (LEDs) for simultaneous illumination and data transmission.
    • Flexible and energy-efficient lighting control is crucial for modern VLC applications.
    • Existing dimming methods for OFDM-based VLC systems face limitations in dynamic range and complexity.

    Purpose of the Study:

    • To propose a novel dimming control scheme for spectrally efficient clipping-free multilayer optical orthogonal frequency division multiplexing (CFMO-OFDM) based VLC systems.
    • To achieve high dynamic-range dimming control for LEDs while maintaining communication performance.
    • To enhance flexibility and reduce implementation complexity compared to existing methods.

    Main Methods:

    • A novel dimming control scheme is proposed for CFMO-OFDM VLC systems.
    • Time-domain CFMO-OFDM signals are grouped based on frequency-domain subcarrier distribution.
    • A periodic grouped direct current (DC) signal is flexibly added to the CFMO-OFDM signals for dimming control.

    Main Results:

    • The proposed scheme demonstrates a higher dimming range compared to classical asymmetrical hybrid optical OFDM (AHO-OFDM) and DC bias-based dimming methods.
    • Superior bit error rate (BER) performance is achieved.
    • The scheme offers improved flexibility and lower implementation complexity.

    Conclusions:

    • The novel dimming control scheme effectively enhances dimming capabilities in CFMO-OFDM VLC systems.
    • This approach provides a promising solution for flexible and energy-efficient LED lighting with integrated communication.
    • The proposed method outperforms existing techniques in terms of dimming range, flexibility, complexity, and BER.