Sonderkolloquium Prof. Joachim Holtz, Technical University Braunschweig / 25.11.2016

25.11.2016 von 12:00 bis 13:00

Technische Fakultät, Institut für Elektrotechnik und Informationstechnik, Kaiserstr. 2, Kiel, Raum: Geb. B Raum 101

Titel: Predictive Current Control

Abstract: Predictive Current Control – When to use?

Switching losses contribute the major portion to the total losses in medium voltage drives. Operation at extremely low switching frequency is therefore mandatory. Low harmonic current distortion can be nevertheless maintained when predictive current control is used.

Predictive current control is currently attracting the interest of many researchers. Even specific conferences are being organized on this novel topic. The predictive algorithm directly generates the firing pulses of the inverter, thus eliminating a pulsewidth modulator. A preset magnitude of the current error is permitted, defined as the magnitude difference between reference and actual current space vectors. Inverter gate pulses are generated such as to maximize the time differences between any two switching instants. This minimizes the switching frequency, and thus the switching losses. Harmonic current distortion is held at a predetemined value.

A gate pulse is generated whenever a predefined current error is exceeded. That error is computed as the difference between reference and actual current space vector. The next switching state is then determined such that maximum time elapses until the error vector exceeds its limit again. This minimizes the switching frequency and also the switching losses. Overmodulation and a smooth transition to full-wave operation produces maximum inverter output voltage. The error vector is represented here in a rotor field oriented coordinate system and different error magnitudes are permitted in the respective axes. 

About the Speaker

Joachim Holtz graduated in 1967 and received the Ph.D. degree in 1969 from the Technical University Braunschweig, Germany.

In 1969 he became Associate Professor and, and in 1971 Full Professor and Head of the Control Engineering Laboratory, Indian Institute of Technology in Madras, India. He joined the Siemens Research Laboratories in Erlangen, Germany in 1972. From 1976 to 1998, he was Professor and Head of the Electrical Machines and Drives Laboratory, Wuppertal University, Germany. He is presently Professor Emeritus and a Consultant.

His publications include 2 invited papers in the PROCEEDINGS OF THE IEEE, 17 invited papers in IEEE Journals, and 27 single-authored IEEE Journal papers. He is the recipient of 17 Prize Paper Awards, a coauthor of seven books and holds 33 patents.

Dr. Holtz is the recipient of the IEEE Industrial Electronics Society Dr. Eugene Mittelmann Achievement Award, the IEEE Industrial Applications Society Outstanding Achievement Award, the IEEE Power Electronics Society William E. Newell Field Award, the IEEE Third Millennium Medal, the Anthony J. Hornfeck Service Award, and the IEEE Lamme Gold Medal. He is a Life Fellow of the IEEE.

Dr. Holtz is Past Editor-in-Chief of the IEEE Transactions on Industrial Electronics, Distinguished Lecturer of the IEEE Industrial Applications Society and IEEE Industrial Electronics Society.

Prof. Marco Liserre

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