Institute of Automatic Control Łódź, November 22-24, 2017
kosene @

Plenary session

Plenary lecture „Advanced control methods of DC/AC and AC/DC power converters – look-up table and predictive algorithms” will be given by prof. Andrzej Sikorski

AC/DC/AC converters (back-to-back converters), as a whole, are used to connect induction motors of adjustable drives and also wind or water turbines renewable energy sources with the grid. In recent years a growing interest has been observed in AC/DC converters connecting DC voltage systems to the grid. This is due to their advantages such as availability of a bidirectional power flow and the unity power factor. AC/DC converters are widely used especially to connect different types of renewable energy sources, such as photovoltaic cells or fuel cells to the grid. The dependences describing the direction and speed of current vector change (the grid or IM stator current vector), caused by each voltage vector of the converter, enables the analysis and synthesis of look-up table direct torque and flux control of an induction motor fed by a DC/AC inverter as well as the direct power control of an AC/DC converter cooperating with the grid. The alternative nonlinear control approach is based on Model Predictive Control methods for AC/DC and DC/AC converters. Proposed control algorithms DPC-3V and DTC-3V belong to ICS-MPC methods. They are based on current error vector minimization criteria. The converter output set voltage vector is reproduced by SVM that provides the advantages typical for linear methods, i.e. constant switching frequency and low grid current or torque ripples. In transient states, they provide maximum dynamics comparable to the fastest nonlinear control methods. New FCS-MPC method for the voltage source rectifier with input LCL filter, similar to ICS-MPC will be presented. Differential equations describing the converter and the load are used to predict the direction and the rate of changes of the converter current and the filtering capacitor voltage vectors. Predicted values are used to define errors for every output voltage vector, which allows us to find the minimal value of the cost function. It results in choosing an optimal voltage vector and controlled quantities error mini-mization.

Prof. Andrzej Sikorski earned his M.Sc., Ph.D. and D.Sc. degrees in electrical engineering from Bialystok University of Technology, Bialystok, Poland, Warsaw University of Technology, Warsaw, Poland and Poznan University of Technology, Poznan, Poland in 1980, 1989 and 2000, respectively. In 2011 he was honored a distinguished professorship in technical sciences by the President of the Republic of Poland. From 1994 to 2003, he headed up the Power Electronic Division and from 2008 to 2016 he chaired the Department of Power Electronics and Electric Drives of Faculty of Electrical Engineering Bialystok University of Technology. In 2016 Professor Sikorski was elected a Vice-Rector for Scientific at Research Bialystok University of Technology. Since 2003 he is a member of Section of Power Electronics and Electrical Drives of Committee on Electrical Engineering Polish Academy of Sciences and since 2013 he was elected to Committee on Electrical Engineering PAS. Professor Sikorski is renowned for his sound knowledge in power electronics, specializing in control of power electronics inverters applied in drives and power system.

Updated: 7.06.2017