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Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
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Improved Active Harmonic Current Elimination Based on Voltage Detection.

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Summary
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This study introduces an improved resistive active power filter (R-APF) algorithm for mitigating harmonics in power systems. The novel integral-decoupling control effectively reduces harmonic currents, outperforming traditional methods.

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering
  • Control Systems

Background:

  • Increasing use of power electronic equipment causes harmonic distortions in residential distribution systems.
  • Distributed Generation (DG) interfacing converters are key for harmonics mitigation.
  • Existing methods like Active Resonance Damper (ARD) and Harmonic Voltage Compensator (HVC) have limitations.

Purpose of the Study:

  • To address the stability issues and limited effectiveness of traditional ARD algorithms.
  • To propose a novel improved resistive active power filter (R-APF) algorithm.
  • To provide design guidelines for the new R-APF algorithm.

Main Methods:

  • Development of an improved R-APF algorithm utilizing integral-decoupling control.
  • Analysis of closed-loop poles' trajectory for parameter design guidelines.
  • Computer simulations to validate the algorithm's performance.

Main Results:

  • The proposed R-APF algorithm effectively mitigates load harmonic currents.
  • The integral-decoupling control enhances performance compared to traditional ARD.
  • Stability issues associated with traditional ARD are overcome.

Conclusions:

  • The novel R-APF algorithm offers superior harmonic mitigation in distribution systems.
  • Integral-decoupling control is a promising approach for active power filtering.
  • The study provides a robust solution for power quality improvement.