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A new combined method in active filter design for power quality improvement in power systems.

ISA transactions·2011
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Adaptive filter design based on the LMS algorithm for delay elimination in TCR/FC compensators.

Rahmat Allah Hooshmand1, Mahdi Torabian Esfahani

  • 1Electrical Engineering Department, University of Isfahan, Isfahan, Iran. hooshmand_r@yahoo.com

ISA Transactions
|January 4, 2011
PubMed
Summary

A new adaptive filter method using least mean square (LMS) algorithms improves Thyristor Controlled Reactor/Fixed Capacitor (TCR/FC) compensator performance. This enhances response time and power quality for systems with variable loads like electric arc furnaces.

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering
  • Control Systems

Background:

  • Thyristor Controlled Reactor/Fixed Capacitor (TCR/FC) compensators are crucial for reactive power compensation and power quality improvement.
  • Performance degradation occurs due to response delays in conventional TCR/FC systems.
  • Nonlinear and time-varying loads, such as electric arc furnaces (EAFs), exacerbate power quality issues like voltage fluctuations and harmonics.

Purpose of the Study:

  • To propose a novel method for eliminating response delay in TCR compensators.
  • To enhance the overall performance and responsiveness of TCR compensators.
  • To improve power quality in systems with challenging load conditions.

Main Methods:

  • Development of a new control method employing adaptive filters (AF).
  • Implementation of the least mean square (LMS) algorithm for adaptive filter design.
  • Substitution of fixed capacitors with band-pass LC filters within the TCR/FC compensator.
  • Testing the proposed design on a realistic steel complex system model with EAF loads.

Main Results:

  • The proposed adaptive filter method effectively eliminated response delay in the TCR/FC compensator.
  • Significant improvement in the compensator's performance was observed.
  • The system demonstrated enhanced capability in mitigating power quality phenomena caused by EAFs.
  • Simulation results confirmed the efficacy of the adaptive filter control strategy.

Conclusions:

  • The novel adaptive filter-based control method offers an efficient solution for TCR/FC compensator delay issues.
  • This approach leads to superior reactive power compensation and power quality enhancement.
  • The method is particularly effective for mitigating issues arising from nonlinear and time-varying loads.