Journal ArticleDOI
A Two Degrees of Freedom Resonant Control Scheme for Voltage-Sag Compensation in Dynamic Voltage Restorers
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TLDR
In this paper, a two-degree-of-freedom (2DOF) control scheme for voltage compensation in a dynamic voltage restorer (DVR) power circuit is presented.Abstract:
This paper presents a two degrees of freedom (2DOF) control scheme for voltage compensation in a dynamic voltage restorer (DVR). It commences with the model of the DVR power circuit, which is the starting point for the control design procedure. The control scheme is based on a 2DOF structure implemented in a stationary reference frame ( $\alpha \text{--}\beta$ ), with two nested controllers used to obtain a passband behavior of the closed-loop transfer function, and is capable of achieving both a balanced and an unbalanced voltage-sag compensation. The 2DOF control has certain advantages with regard to traditional control methods, such as the possibility of ensuring that all the poles of the closed-loop transfer function are chosen without the need for observers and reducing the number of variables to be measured. The use of the well-known double control-loop schemes that employ feedback current controllers to reduce the resonance of the plant is, therefore, unnecessary. A simple control methodology permits the dynamic behavior of the system to be controlled and completely defines the location of the poles. Furthermore, extensive simulations and experimental results obtained using a 5-kW DVR laboratory prototype show the good performance of the proposed control strategy.read more
Citations
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Proceedings ArticleDOI
A Single Feedback Current Control Design Technique for LCL Grid-Connected Inverters Based on Pole Allocation in the Frequency Domain
Uziel Santos de Araujo,Joao Raphael Souza Martins,André Pires Nóbrega Tahim,Darlan A. Fernandes,Jose Renes Pinheiro,Fabiano F. Costa +5 more
TL;DR: A polynomial-based pole-placement technique for designing high-order current controllers of LCL grid-connected inverters that provides stability robustness and suitable dynamic response for a broad range of the grid parameter variation.
Journal ArticleDOI
2DOF-based current controller for single-phase grid-connected voltage source inverter applications
Francisco Javier López-Alcolea,Emilio J. Molina-Martinez,Alfonso Parreño Torres,Javier Vázquez,Pedro Roncero-Sanchez +4 more
TL;DR: In this paper , the authors proposed a discrete-time control scheme for the current injected into the grid by a single-phase voltage source inverter (VSI) that attenuates the switching harmonics present in the output waveform of the inverter.
Journal ArticleDOI
A new-fangled controlling structure for mitigating voltage sag using the dvr
TL;DR: This paper intends to develop a new controlling algorithm, namely, Synchronous Reference Theory (SRF), for voltage sag mitigation, and its primary considerations are to moderate the voltage sag, analyze the imbalance cutting-edge source voltage, and reduce the harmonic content.
Modeling and simulation of grid connected hybrid pv-wind power system using battery and smes based dvr with improved power quality features
TL;DR: In this article, a new Dynamic Voltage Restorer (DVR) topology has been proposed, where the capacity of the voltage source inverter and values of the link filter is small that will improve the compensation capabilities for voltage harmonic, swell and voltage sag mitigation under various fault conditions.
Book ChapterDOI
Dynamic voltage restorer controlled per independent phases for power quality sags-swells mitigation under unbalanced conditions
TL;DR: In this paper , a two-level, three-phase voltage-source converter is employed to alleviate power quality sags-swells under unbalanced/balanced grid conditions, employing a dynamic voltage restorer controlled per independent phases.
References
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