1. Professor Faculty of Electrical and Computer Engineering, Institute of Control Theory, Technische Universität Dresden, Dresden 01062, Germany e-mail:
2. Faculty of Electrical and Computer Engineering, Institute of Control Theory, Technische Universität Dresden, Dresden 01062, Germany e-mail:
3. Professor Faculty of Electrical Engineering and Information Technology, HTWK Leipzig University of Applied Sciences, Leipzig 04107, Germany e-mail: