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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.
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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
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Dynamic Voltage Restorer (DVR) with a novel robust control strategy.

Saeed DaneshvarDehnavi1, Cesar Negri1, Stephen Bayne1

  • 1Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.

ISA Transactions
|April 23, 2021
PubMed
Summary
This summary is machine-generated.

A new control strategy using an Uncertainty and Disturbance Estimator (UDE) enhances Dynamic Voltage Restorer (DVR) performance. This improves power quality by robustly compensating for grid voltage disturbances and harmonics.

Keywords:
Dynamic Voltage Restorer (DVR)Hardware-In-the-Loop (HIL)OPAL-RTSensitive loadUncertainty and Disturbance Estimator (UDE)Voltage phase jump compensationVoltage sag compensation

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering

Background:

  • Modern electrical equipment is sensitive to power quality issues like voltage sags, swells, imbalances, and harmonics.
  • Dynamic Voltage Restorers (DVRs) are cost-effective solutions for protecting sensitive loads from voltage distortions.

Purpose of the Study:

  • To propose a novel control strategy for DVRs to enhance their robustness and stability.
  • To effectively compensate for grid voltage disturbances and other power quality issues.

Main Methods:

  • A control strategy based on Uncertainty and Disturbance Estimator (UDE) was developed.
  • Lyapunov stability theory was used to analyze and validate the control system's stability.
  • Simulations in MATLAB/Simulink and Hardware-In-the-Loop (HIL) validation with OPAL-RT were performed.

Main Results:

  • The proposed UDE-based control strategy demonstrated robustness and improved DVR response.
  • The system showed fast transient response and effective harmonic rejection.
  • Validation confirmed the controller's effectiveness under diverse conditions and real-time scenarios.

Conclusions:

  • The novel UDE control strategy offers a robust, stable, and simplified solution for DVRs.
  • It effectively mitigates power quality issues caused by grid voltage distortions.
  • The approach provides excellent performance without complex transformations or tuning.