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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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2255-9159
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Simulation of Grid Connected Three-Level Neutral-Point-Clamped qZS Inverter using PSCAD

Carlos Roncero-Clemente / Enrique Romero-Cadaval / Oleksandr Husev / Dmitri Vinnikov / Serhii Stepenko
Published Online: 2013-05-11 | DOI: https://doi.org/10.2478/ecce-2013-0002

Abstract

This paper is focused on a single-phase three-level neutral-point-clamped quasi-z-source inverter when it is operating being connected to the electrical grid. A control strategy for injecting current synchronized in phase with the voltage at the point of common coupling has been proposed and studied. It is achieved by means of controlling the output voltage between branches adjusting the output current by using a d-q frame and the analysis of the output filter. The control strategy generates the reference to be used in the modulation technique and it has been validated with and without shoot-through switching states. A method to calculate the minimum value of the shoot-through duty cycle is also explained in order to assure the proper control of the injected current when the input voltage is less than peak value of the grid voltage. It is an important feature because 3L-NPC qZSI due to its possibility of boosting input voltage in a single stage would operate better than a traditional inverter, for instance in photovoltaic applications when the value of irradiance is decreased. The presented results have been obtained using PSCAD/EMTDC as a simulation tool.

Keywords : Computer simulation; power system simulation; PSCAD; pulse width modulation inverters; voltage control

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About the article

Carlos Roncero-Clemente

Carlos Roncero-Clemente (S’08) received the B.Sc. and M.Sc. degrees in electrical engineering from University of Extremadura, Spain, in 2006 and 2008, respectively, where he is currently working toward the Ph.D. degree. His Ph.D. thesis is devoted to the research and development of controls for inverters. He is currently with the Power Electrical and Electronic Systems (PE&ES) Research Group (http://peandes.unex.es). His research interests are power electronics in the power system, power quality, active power filters, renewable energy sources control, and smart grid. Postal address: Universidad de Extremadura, Campus universitario, Escuela de Ingenierías Industriales, Laboratorio C2.7, Avda. de Elvas, s/n 06006, Badajoz, Spain.

Enrique Romero-Cadaval

Enrique Romero-Cadaval (SM’10) was born in Villafranca de los Barros, Badajoz, Spain, in 1968. He received the M.Sc. degree in electronic industrial engineering from ICAI, Universidad Pontificia de Comillas, Madrid, Spain, in 1992 and the Ph. D. degree from the Universidad de Extremadura, Badajoz, Spain, in 2004. He is a full Professor in power electronics at the Universidad of Extremadura, Badajoz, Spain. He is currently with the Power Electrical and Electronic Systems (PE&ES) Research Group (http://peandes.unex.es). His research interests are power electronics in the power system, power quality, active power filters, renewable energy sources control, smart grids, and electrical vehicles. Postal address: Universidad de Extremadura, Campus universitario, Escuela de Ingenierías Industriales, Laboratorio C2.7, Avda. de Elvas, s/n 06006, Badajoz, Spain.

Oleksandr Husev

Oleksandr Husev received the B.Sc., M.Sc. in industrial electronics and the Ph.D. degrees from Chernihiv State Technological University, Chernihiv, Ukraine, in 2007, 2008 and 2012 respectively. He is an assistant of the Department of Industrial Electronics, Chernihiv State Technological University and currently cooperates with the Department of Electrical Engineering, Tallinn University of Technology. He has over 20 publications and is the holder of several patents. His research interests are in control systems for power electronic converters based on a wide range of algorithms, including modeling, design, and simulation. Postal address: Chernihiv State Technological University, Shevchenko street 95, Chernihiv 14027, Ukraine.

Dmitri Vinnikov

Dmitri Vinnikov received the Dipl.Eng, M.Sc. and Dr.Sc.techn. degrees in electrical engineering from Tallinn University of Technology, Tallinn, Estonia, in 1999, 2001 and 2005, respectively. He is presently a Senior Researcher in the Department of Electrical Engineering, Tallinn University of Technology. He has authored more than 100 published papers on power converters design and development and is the holder of several Utility Models in this application field. His research interests include switch mode power converters, modeling and simulation of power systems, applied design of power converters and control systems and application, and development of energy storage systems. Postal address: Department of Electrical Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.

Serhii Stepenko

Serhii Stepenko received the B.Sc. and M.Sc. degrees in electronics from Chernihiv State Technological University, Chernihiv, Ukraine, in 2010 and 2011 respectively, where he is currently working toward the PhD degree. His PhD thesis is devoted to intelligent regulation in energy efficient voltage converters. He is an assistant at the Department of Industrial Electronics, Chernihiv State Technological University and currently cooperates with the Department of Electrical Engineering, Tallinn University of Technology. He has 16 publications including papers in the international conferences proceedings, Ukrainian scientific journals and articles indexed by IEEE Xplore, Scopus and Google Scholar databases. His research interests are in power electronics, intelligent regulation and electrical systems based on renewable energy sources. Postal address: Chernihiv State Technological University, Shevchenko street 95, Chernihiv 14027, Ukraine.


Published Online: 2013-05-11

Published in Print: 2013-04-01


Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0002.

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