Guerrero, Josep M.

English

Smart grid (SG) is usually described as a power system utilizing information and communication technology (ICT) and advanced monitoring systems to improve the grid performance and offer a wide range of additional services for the consumers. Some of the main features of such a grid are self-healing from power disturbances, efficient energy management, automation based on ICT and advanced metering infrastructures (smart metering), integration of distributed power generation, renewable energy resources and storage units as well as high power quality and reliability. In this regard, the concept of microgrid is brought to the stage as one of the main building blocks of the future SGs

    Aalborg UniversitetGuest Editorial Special Issue on Power Quality in Smart GridsGuerrero, Josep M.Published in:I E E E Transactions on Smart GridDOI (link to publication from Publisher):10.1109/TSG.2016.2634482Publication date:2017Document VersionEarly version, also known as pre-printLink to publication from Aalborg UniversityCitation for published version (APA):Guerrero, J. M. (2017). Guest Editorial Special Issue on Power Quality in Smart Grids. I E E E Transactions onSmart Grid, 8(1), 379-381. https://doi.org/10.1109/TSG.2016.2634482General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: November 29, 2020www.microgrids.et.aau.dk  Guest Editorial Special Issue on Power Quality in Smart Grids  Smart grid (SG) is usually described as a power system utilizing information and communication technology (ICT) and advanced monitoring systems to improve the grid performance and offer a wide range of additional services for the consumers. Some of the main features of such a grid are self-healing from power disturbances, efficient energy management, automation based on ICT and advanced metering infrastructures (smart metering), integration of distributed power generation, renewable energy resources and storage units as well as high power quality and reliability. In this regard, microgrid concept is brought to the stage as one of the main building blocks of the future SGs.  In the context of SG, Power Quality (PQ) has emerged as one of the most important issues. Although PQ is not a new topic in electrical systems, it deserves especial attention in modern grids mainly due to the following reasons: • Increasing application of sensitive loads and control processes in recent years • Proliferation of different nonlinear and single-phase loads which may adversely affect the PQ. • Availability of advanced metering, sensing and control functionalities in SGs which can be utilized to provide a desirable PQ level for consumers.  Thus, measurement, analysis, and compensation power quality problems (e.g. harmonics, resonances, unbalances, sags, flickers, and so on) are of great importance.   In Special Issue on Power Quality in Smart Grids, we have nine high-quality papers that cover the following four topics: • Analysis of power quality problems • Control Schemes for enhance power quality • Advances methods for power quality assessment • Synchronization techniques These topics and the papers included are explained in the following sections of this Guest Editorial.  I. ANALYSIS OF POWER QUALITY PROBLEMS In this Section, methods and analysis are proposed to assess or evaluate the power quality impact of using more power electronics systems and other smart devices into the electrical grid. The two following papers are included in this Section: • “Impact of modern electronic equipment on the assessment of network harmonic impedance,” by D. Chakravorty et Al., provides a methodology to visualize the impedance variation within a line cycle due to the power electronics switching.  Further, three indices are proposed for quantify of this impedance variation.   • “Power quality concerns in implementing smart distribution-grid applications,” by M. Bollen et Al., maps the expected power quality consequences of introducing several smart distribution-grid technologies and   applications, such as: microgrids, advanced voltage control, feeder reconfiguration and demand-side management.  II. CONTROL SCHEMES FOR ENHANCE POWER QUALITY  In order to improve the power quality in microgrids and smart grids, active power filters, inverters and other power electronics based equipment need for superior controllers. This Section includes the following four papers:   • “Design of a thyristor controlled LC compensator for dynamic reactive power compensation in Smart Grid” by C.-S. Lam et al., presents a thyristor controlled LC compensator for dynamic reactive power compensation. Compared with the traditional static var compensators, it can significantly mitigate the injection of harmonic currents. • “Power Quality Conditioning in LV Distribution Networks: Results by Field Demonstration,” by H. Hafezi et al., proposes a  new  system  solution to  improve the PQ level  in  LV  distribution  networks given by  the  use  of an  Open Unified Power Quality Conditioner. It  consists  of  a  single  or  three-phase  AC/DC power  converter  installed  at  customer  side  and  a  single/three-phase AC/DC power  converter  in  the MV/LV substation. www.microgrids.et.aau.dk  • “Using Smart Impedance to Transform High Impedance Microgrid in a Quasi-infinite Busbar,” G. Lambert-Torres et al., the  use  of  a smart impedance, an application  of  a hybrid  active power filter, is proposed to change the microgrid bus impedance forcing it to behave  as  a  quasi-infinite  bus,  without  increasing  active  power capacity  of  the  microgrid. • “Centralized Control of Distributed Single-Phase Inverters Arbitrarily Connected to Three-Phase Four-Wire Microgrids” by D. Brandao et al.,  proposes   a technique   to control  the  power  flow  among  different  phases  of  a  three-phase four-wire distribution power system  by  means  of  single-phase converters arbitrarily connected among the phases. The objective is to improve the power quality at the point-of-common-coupling of a microgrid, to enhance voltage profile through the lines, and reduce the overall distribution losses.  III. ADVANCES METHODS FOR POWER QUALITY ASSESSMENT   The assessment of power quality through smart meters and phasor measurement units is a new powerful tool in smart grids. Two relevant papers are included in this Section:  • “Syncretic use of smart meters for Power Quality monitoring in emerging networks” by M. Albu et al., proposes  an  alternative  PQ-framed  aggregation algorithm  to  be  implemented  in  smart  meters. In  this  way  smart  metering  can become enabler  of  real-time voltage control required in active distribution grids. • “A Fast Harmonic Phasor Measurement Method for Smart Grid Applications” by S. Jain et al.,  proposed a parametric method, estimation  of  signal  parameters  using  rotational  invariance technique has been used to   estimate   harmonic phasors applied to the IEEE Std. C37.118.1 for synchrophasors.  IV. SYNCHRONIZATION TECHNIQUES Finally, the synchronization of power electronics converters in microgrids is crucial to reconnect those small grid systems to the smart grids, and presented in the following paper: • “Synchronization of power inverters in islanded microgrids using an FM-modulated signal” by I. Patrao et al., a synchronization technique is proposed based on frequency modulation to be transmitted thus being robust against noise. The demodulation is performed with low computational load to synchronize the grid-forming power electronics converters of a microgrid.  ACKNOWLEDGMENT The Guest Editor would like to thank the IEEE Transactions on Smart Grid journal and their supporting IEEE societies, the authors, the reviewers, and the Guest Editors: Hirofumi Akagi (Tokyo Institute of Technology, Japan), Jesus Doval-Gandoy (Universidad de Vigo, Spain), Ehab El-Saadany (University of Waterloo, Canada), Mahmud Fotuhi-Firuzabad (Sharif University of Technology, Iran), Marcelo Godoy-Simões (Colorado School of Mines, USA), Tzung-Lin Lee (National Sun Yat-sen University, Taiwan), Mehdi Savaghebi (Aalborg University, Denmark). He is also grateful to Jianhui Wang, TSG Editor-in-Chief and Ms Cheryl Koster, TSG Editorial Assistant for their constant help and support.    Josep M. Guerrero (S’01-M’04-SM’08-FM’15) received the B.S. degree in telecommunications engineering, the M.S. degree in electronics engineering, and the Ph.D. degree in power electronics from the Technical University of Catalonia, Barcelona, in 1997, 2000 and 2003, respectively. Since 2011, he has been a Full Professor with the Department of Energy Technology, Aalborg University, Denmark, where he is responsible for the Microgrid Research Program (www.microgrids.et.aau.dk). From 2012 he is a guest Professor at the Chinese Academy of Science and the Nanjing University of Aeronautics and Astronautics; from 2014 he is chair Professor in Shandong University; from 2015 he is a distinguished guest Professor in Hunan University; and from 2016 he is a visiting professor fellow at Aston University, UK, and a guest Professor at the Nanjing University of Posts and Telecommunications. His research interests is oriented to different microgrid aspects, including power electronics, distributed energy-storage systems, hierarchical and cooperative control, energy management systems, smart metering and the internet of things for AC/DC microgrid clusters and islanded minigrids; recently specially focused on maritime microgrids for electrical ships, vessels, ferries and seaports. Prof. Guerrero is an Associate Editor for the IEEE TRANSACTIONS ON POWER ELECTRONICS, the IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, and the IEEE Industrial Electronics Magazine, and an Editor for the IEEE TRANSACTIONS on SMART GRID and IEEE TRANSACTIONS on ENERGY CONVERSION. He has been Guest Editor of the IEEE TRANSACTIONS ON POWER ELECTRONICS Special Issues: Power Electronics for Wind Energy Conversion and Power Electronics for Microgrids; the IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS Special www.microgrids.et.aau.dk  Sections: Uninterruptible Power Supplies systems, Renewable Energy Systems, Distributed Generation and Microgrids, and Industrial Applications and Implementation Issues of the Kalman Filter; the IEEE TRANSACTIONS on SMART GRID Special Issues: Smart DC Distribution Systems and Power Quality in Smart Grids; the IEEE TRANSACTIONS on ENERGY CONVERSION Special Issue on Energy Conversion in Next-generation Electric Ships. He was the chair of the Renewable Energy Systems Technical Committee of the IEEE Industrial Electronics Society. He received the best paper award of the IEEE Transactions on Energy Conversion for the period 2014-2015, and the best paper prize of IEEE-PES in 2015. In 2014, 2015, and 2016 he was awarded by Thomson Reuters as Highly Cited Researcher, and in 2015 he was elevated as IEEE Fellow for his contributions on “distributed power systems and microgrids.”    

Guest Editorial Special Issue on Power Quality in Smart Grids

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Guest Editorial Special Issue on Power Quality in Smart Grids

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