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Prof. Ralph KENNEL,
Elektrische Antriebssysteme und Leistungselektronik,
Fakultät, TU München

Ralph M. Kennel was born in 1955 at Kaiserslautern (Germany). In 1979 he got his diploma degree and in 1984 his Dr.-Ing. (Ph.D.) degree from the University of Kaiserslautern.
From 1983 to 1999 he worked on several positions with Robert BOSCH GmbH (Germany). Until 1997 he was responsible for the development of servo drives. Dr. Kennel was one of the main supporters of VECON and SERCOS interface, two multi-company development projects for a microcontroller and a digital interface especially dedicated to servo drives. Furthermore he took actively part in the definition and release of new standards with respect to CE marking for servo drives.
Between 1997 and 1999 Dr. Kennel was responsible for "Advanced and Product Development of Fractional Horsepower Motors" in automotive applications. His main activity was preparing the introduction of brushless drive concepts to the automotive market.
From 1994 to 1999 Dr. Kennel was appointed Visiting Professor at the University of Newcastle-upon-Tyne (England, UK). From 1999 - 2008 he was Professor for Electrical Machines and Drives at Wuppertal University (Germany). Since 2008 he is Professor for Electrical Drive systems and Power Electronics at Technische Universitaet Muenchen (Germany). His main interests today are: Sensorless control of AC drives, predictive control of power electronics and Hardware-in-the-Loop systems.
Dr. Kennel is a Senior Member of IEEE, a Fellow of IET (former IEE) and a Chartered Engineer in the UK. Within IEEE he is Treasurer of the Germany Section as well as Distinguished Lecturer of the Power Electronics Society (IEEE-PELS). Dr. Kennel has received in 2013 the Harry Owen Distinguished Service Award from IEEE-PELS as well as the EPE Association Distinguished Service Award in 2015.
Dr. Kennel was appointed “Extraordinary Professor” by the University of Stellenbosch (South Africa) from 2016 to 2019 and as “Visiting Professor” at the Haixi Institute by the Chinese Academy of Sciences from 2016 to 2021.

Hardware-in-the-Loop Systems with Power Electronics -
a Powerful Simulation Tool


The application of Hardware-in-the-Loop systems has become a "hype" during the last years. Especially Hardware-in-the-Loop systems with Power Electronics (PHiL) have got in the focus of power engineers. In difference to Hardware-in-the-Loop Systems used some 20 to 30 years ago, where the main purpose was to prove the proper (signal processing) performance of the hardware included in the simulation system, modern hardware-in-the-loop systems with power electronics have a different background purpose. The hardware included in the simulation process is not a device under test, but a possibility to include real energy in the simulation.
Usual simulation programs deal with numbers and respective mathematical equations only. Any physical restriction or limitation has to be considered by a respective model. Any mistake in the modelling results in failures during simulation. The physical behavior of energy has specific characteristics and restrictions given by nature. Including real energy in the simulation process would consider these natural characteristics without the need of designing a respective simulation model.
Power electronics provide the possibility of including real energy in the simulation without losing it during the process. Shifting energy from one storage device (inductance, capacitance, etc.) to another one and feeding back the respective physical quantities to the simulation program results in a Hardware-in-the-Loop System with Power Electronics (PHiL), with real energy as part of the simulation.
This part of the seminar reports about experiences with a PHiL-System used for simulation of electrical machines for testing power electronic products.