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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 Study of Nonlinear PI-Controller with Quasi-Z-Source Derived Push-Pull Converter

Andrii Chub / Oleksandr Husev / Dmitri Vinnikov
Published Online: 2013-12-31 | DOI: https://doi.org/10.2478/ecce-2013-0018

Abstract

This paper is focused on the control issues of the quasi-Z-source derived push-pull converter with integrated magnetic elements. The proposed converter is intended for applications that require a high gain of the input voltage and galvanic isolation, i.e. power conditioning systems for renewable energy sources, such as variable speed wind turbines with direct driven permanent magnet synchronous generators. Magnitude and frequency of the output voltage of such turbines are variable due to intermittent nature of the wind power. Despite number of advantages converter has complicated dynamic behavior. Simulations showed change of stability margin depending on current operation point of the wind turbine and output load. Closed loop control system should provide fast response and stable operation in the wide range of wind speeds. Simulations showed that the conventional PI-controller with saturation cannot satisfy those requirements. Nonlinear PI-controller was derived by adding adjustment block to the conventional PI-controller. Adjustment block is drastically changing proportional and integral gains of the controller according to sign of the output voltage error. Proposed controller is compared with conventional one by means of simulation in PSIM. Simulation results prove that proposed nonlinear control system has improved regulator performance.

Keywords : DC-DC power converters; automatic voltage control; closed loop systems; control system synthesis

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About the article

Andrii Chub

Andrii Chub received the B.Sc. degree in Electronics and M.Sc. degree in Electronic Systems from Chernihiv State Technological University, Chernihiv, Ukraine, in 2008 and 2009 respectively. He is currently pursuing the Ph.D. degree in the Power Electronics Research Group at the Department of Electrical Engineering, Tallinn University of Technology. He is currently an Engineer at the Department of Electrical Engineering, Tallinn University of Technology. His research interests include dc-dc converters, dc-ac inverters, implementation of the new wide bandgap semiconductors in power converters, and control of the renewable energy conversion systems. Postal address: Department of Electrical Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia, e-mail: andrii.chub@ieee.org

Oleksandr Husev

Oleksandr Husev received the B.Sc. and M.Sc. degrees in industrial electronics from Chernihiv State Technological University, Chernihiv, Ukraine, in 2007 and 2008 respectively. He defended PhD thesis in the Institute of Electrodynamics of the National Academy of Science of Ukraine in 2012. He is senior researcher of the Department of Electrical Engineering, Tallinn University of Technology and assistant of the Department of Biomedical Radioelectronics Apparatus and Systems, Chernihiv State Technological University. He has over 40 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, applied design of power converters and control systems and application. Postal address: Department of Electrical Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia, e-mail: gsfki@ukr.net

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 currently a Head of the Power Electronics Research Group at the Department of Electrical Engineering, Tallinn University of Technology. He has authored more than 100 published papers on power converter design and development and is the holder of several patents and utility models in this application field. His research interests include switchmode 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, e-mail: dmitri.vinnikov@ieee.org


Published Online: 2013-12-31

Published in Print: 2013-12-01


Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0018.

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