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Related Concept Videos

Fault Types01:18

Fault Types

57
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
57
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

65
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
65
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

101
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
101
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

134
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:
134
Bus Impedance Matrix01:24

Bus Impedance Matrix

86
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
86
Series R—L Circuit Transients01:22

Series R—L Circuit Transients

75
In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
75

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Related Experiment Video

Updated: May 12, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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High resistance fault detection in DC microgrid using Hilbert Huang transform and vector-based ensemble optimized

H K Prashanth Kumar1, Ritesh Dash1, K Jyotheeswara Reddy1

  • 1School of Electrical and Electronics Engineering, REVA University, Bangalore, India.

Scientific Reports
|May 9, 2025
PubMed
Summary

This study introduces a novel Long Short-Term Memory (LSTM) and Hilbert-Huang Transform (HHT) model for advanced fault detection in DC microgrids. The LSTM-HHT approach significantly improves accuracy, especially for challenging high-resistance faults.

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Signal Processing

Background:

  • DC microgrids are increasingly adopted, requiring robust fault detection.
  • Traditional methods like FT and DFT struggle with non-stationary signals and high-resistance faults.

Purpose of the Study:

  • To develop and evaluate an advanced fault detection mechanism for DC microgrids.
  • To overcome limitations of traditional methods in detecting high-resistance faults.

Main Methods:

  • Integration of Long Short-Term Memory (LSTM) networks with the Hilbert-Huang Transform (HHT) model.
  • Implementation and testing using MATLAB Simulink in simulated DC microgrid environments.

Main Results:

  • The proposed LSTM-HHT approach significantly enhances fault detection accuracy and reliability.
  • Demonstrated effectiveness in accurately detecting and localizing challenging high-resistance faults.

Conclusions:

  • The LSTM-HHT model offers a more resilient and intelligent solution for DC microgrid fault detection.
  • This research supports the integration of renewable energy and the development of safer, more stable microgrids.