Journal ArticleDOI
A Demodulation-Based Technique for Robust Estimation of Single-Phase Grid Voltage Fundamental Parameters
TLDR
A robust technique for the single-phase grid voltage fundamental amplitude, frequency, and phase angle estimation under distorted grid conditions based on a demodulation method tuned at a fixed frequency, which is less affected by dc offset, can provide faster frequency estimation, and also avoids interdependent loop, trigonometric, and inverse trig onometric functions operation.Abstract:
This paper proposes a robust technique for the single-phase grid voltage fundamental amplitude, frequency, and phase angle estimation under distorted grid conditions. It is based on a demodulation method tuned at a fixed frequency. It does not have stability issue due to an open-loop structure, does not require real-time evaluation of trigonometric and inverse trigonometric functions, and also avoids the use of look-up table. It can provide accurate estimation of the single-phase grid voltage fundamental parameters under dc offset and harmonics. When compared with a frequency adaptive demodulation technique, the proposed one is less affected by dc offset, can provide faster frequency estimation, and also avoids interdependent loop, trigonometric, and inverse trigonometric functions operation. Simulation and experimental results are presented to verify the performance of the proposed technique.read more
Citations
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Journal ArticleDOI
A True Open-Loop Synchronization Technique
Saeed Golestan,Ana Vidal,Alejandro G. Yepes,Josep M. Guerrero,Juan C. Vasquez,Jesus Doval-Gandoy +5 more
TL;DR: The aim of this paper is to develop a true OLS technique without any need for the calculation of sine and cosine functions, which is undesirable from the computational standpoint, particularly when the implementation with low-cost digital signal processors is intended.
Journal ArticleDOI
An Improved Hybrid Prefiltered Open-Loop Algorithm for Three-Phase Grid Synchronization
Anant Kumar Verma,Raj Kumar Jarial,Pedro Roncero-Sanchez,Mohan Rao Ungarala,Josep M. Guerrero +4 more
TL;DR: A robust three-phase grid synchronization technique has been proposed for rapid detection of fundamental frequency, phase, and amplitude and a novel two consecutive samples based frequency estimator is developed for fast detection of the fundamental frequency.
Journal ArticleDOI
A novel control strategy for grid connected distributed generation system to maximize power delivery capability
Doğan Çelik,Mehmet Emin Meral +1 more
TL;DR: A novel control strategy to maximize power delivery capability of the grid connected inverter interfaced distributed generation (DG) systems and an improved positive and negative sequence extractor (PNS) is proposed to separate sequence components for use in the reference current generator.
Journal ArticleDOI
Complex-Coefficient Complex-Variable Filter for Grid Synchronization Based on Linear Quadratic Regulation
TL;DR: The real coefficient is extended to a complex one leading to acomplex coefficient CVF (CC-CVF), and the filter performance of CVF for extracting the harmonics is significantly improved and linear quadratic regulation is employed to design the complex coefficients to achieve a better dynamic performance.
Journal ArticleDOI
Correlation-Averaging Methods and Kalman Filter Based Parameter Identification for a Rotational Inertial Navigation System
TL;DR: Results show that the estimation accuracy of installation errors is at 10 arcsec levels, which indicates that said errors are estimated accurately using the RINS output initially obtained under dynamic conditions.
References
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Overview of Control and Grid Synchronization for Distributed Power Generation Systems
TL;DR: An overview of the structures for the DPGS based on fuel cell, photovoltaic, and wind turbines is given and the possibility of compensation for low-order harmonics is discussed.
Journal ArticleDOI
A Stationary Reference Frame Grid Synchronization System for Three-Phase Grid-Connected Power Converters Under Adverse Grid Conditions
Pedro Rodriguez,Alvaro Luna,R.S. Munoz-Aguilar,Ion Etxeberria-Otadui,Remus Teodorescu,Frede Blaabjerg +5 more
TL;DR: A new grid synchronization method for three-phase three-wire networks, namely dual second-order generalized integrator (SOGI) frequency-locked loop, based on two adaptive filters, is presented, able to perform an excellent estimation of the instantaneous symmetrical components of the grid voltage under unbalanced and distorted grid conditions.
Journal ArticleDOI
Comparison of Three Single-Phase PLL Algorithms for UPS Applications
Rubens M. Santos Filho,P.F. Seixas,Porfírio Cabaleiro Cortizo,Leonardo A. B. Tôrres,AndrÉ F. Souza +4 more
TL;DR: The developed models proved to accurately represent the PLLs under real test conditions and are presented, providing a refined method for performance evaluation and comparison.
Journal ArticleDOI
Distributed Generation: Toward a New Energy Paradigm
Josep M. Guerrero,Frede Blaabjerg,Toshko Zhelev,Kas Hemmes,Eric Monmasson,Samir Jemei,M.P. Comech,R. Granadino,J.I. Frau +8 more
TL;DR: In this article, the authors discuss distributed generation which is emerging as a new paradigm to produce on-site highly reliable and good quality electrical power and present the DG systems as a suitable form to offer highly reliable electrical power supply.
Journal ArticleDOI
Coordinated Control of Grid-Connected Photovoltaic Reactive Power and Battery Energy Storage Systems to Improve the Voltage Profile of a Residential Distribution Feeder
TL;DR: Results show that reactive compensation from PV inverters alone is sufficient to maintain acceptable voltage profile in an urban scenario, whereas coordinated PV and BES support is required for the rural scenario (high-resistance feeder).