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Related Concept Videos

Superposition Theorem for AC Circuits01:13

Superposition Theorem for AC Circuits

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Consider encountering a circuit in a steady state where all its inputs are sinusoidal, yet they do not all possess the same frequency. Such a circuit is not classified as an alternating current (AC) circuit, and consequently, its currents and voltages will not exhibit sinusoidal behavior. However, this circuit can be analyzed using the principle of superposition.
The principle of superposition stipulates that the output of a linear circuit with several concurrent inputs is equivalent to the...
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The Power Superposition Principle01:19

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Consider a circuit with two sinusoidal voltage sources. Each one influences the circuit independently, and the superposition principle helps us understand the combined effect by adding up the responses from each source.
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Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

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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:
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The Power Flow Problem and Solution01:26

The Power Flow Problem and Solution

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Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Power in a Three-Phase Circuit01:15

Power in a Three-Phase Circuit

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Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
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A harmonic current detection algorithm for aviation active power filter based on generalized delayed signal

Yong Lu1, Bohan Li2, Guofei Teng3

  • 1School of Energy and Electrical Engineering, Chang'an University, Xi'an, 710064, China. luyong@chd.edu.cn.

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|March 27, 2025
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Summary
This summary is machine-generated.

This study introduces a new harmonic detection algorithm for active power filters in variable-frequency aircraft power systems. The proposed method offers improved accuracy and adaptability for More Electric Aircraft (MEA) applications.

Keywords:
Active power filterGeneralized delayed signal superpositionHarmonic detection methodMore electric aircraftVariable-frequency-grids

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Area of Science:

  • Electrical Engineering
  • Aerospace Engineering

Background:

  • Traditional harmonic detection methods struggle with variable-frequency grids in More Electric Aircraft (MEA).
  • Existing techniques exhibit inadequate filtering performance and poor adaptability to frequency fluctuations.

Purpose of the Study:

  • To propose a novel harmonic detection algorithm for active power filters in MEA variable-frequency grids.
  • To enhance filtering performance and adaptability to frequency variations.

Main Methods:

  • Derivation and analysis of a new filtering operator's principle, characteristics, and frequency adaptability.
  • Design of a comprehensive harmonic current detection algorithm based on the proposed operator.
  • Analysis of operator complexity and coefficient symmetry for reduced operation time.

Main Results:

  • The proposed algorithm effectively detects harmonics in complex aerospace power system current signals.
  • Experimental validation confirms superior performance, accuracy, and robustness compared to traditional methods.
  • Demonstrated practical applicability in variable-frequency grid environments.

Conclusions:

  • The developed harmonic detection algorithm addresses limitations of traditional methods for MEA.
  • The algorithm exhibits excellent accuracy, performance, robustness, and adaptability for aerospace power systems.