Abstract
Vector control can not be well applied directly to the starting of large-power induction motors. The starting current is so large as to cause damage to power-conductors and the whole control system. A novel pre-excitation control strategy is proposed in this paper. A magnetic field is built in large power motor startup firstly, in which DC pre-excitation is adopted and the rotor flux orientation is set to coincide with the center line of motor’s one phase winding. With the completion of this pre-excitation, the control strategy is switched to the vector control. The excitation subsystem and the torque subsystem in the motor can be decoupled dynamically after this pre-excitation and vector control. The experimental results show that the motor’s starting current rises smoothly and its output torque has fast response. This control strategy is capable of reducing the motor’s starting current peak and improving the safety of induction motor’s startup.
Zusammenfassung
Die Vektorregelung kann nicht gut direkt auf das Starten von Asynchronmaschinen mit großer Leistung angewendet werden. Der Anlaufstrom ist so groß, dass die Stromleiter und das gesamte Steuerungssystem beschädigt werden. In diesem Artikel wird eine neue Strategie zur Steuerung der Voranregung vorgeschlagen. Zunächst wird beim Hochfahren eines Motors mit großer Leistung ein Magnetfeld aufgebaut, in dem eine Gleichstromvoranregung angewendet wird, die einen Rotorfluss hervorruft, der ausschließlich im Mitsystem des Stators wirkt. Mit Beendigung dieser Voranregung wird die Regelstrategie auf die Vektorregelung umgeschaltet. Nach dieser Vorerregungs- und Vektorregelung können das Erregungs-Teilsystem und das Drehmoment-Teilsystem im Motor dynamisch entkoppelt werden. Die experimentellen Ergebnisse zeigen, dass der Anlaufstrom des Motors gleichmäßig ansteigt und sein Ausgangsdrehmoment schnell anspricht. Diese Regelstrategie kann die Anlaufstromspitze des Motors reduzieren und die Anlaufsicherheit des Induktionsmotors verbessern.
Funding statement: This work is supported by National Science Foundation of China (U1704157 and 61473115), National Key Research and Development Program of China (2017YFB0306400), Scientific and Technological Innovation Leaders in Central Plains (194200510012), Science and Technology Innovative Teams in University of Henan Province (18IRTSTHN011) and China Scholarship Council.
About the authors
Pro. Bo Fan received the B. S. degree from Henan Univ. of Science and Technology, Luoyang, China, the M. S. degree from Lanzhou Univ. of Technology, Lanzhou, China, and the Ph. D. degree from Northwestern Poly-technology University, Xi’an, China, all in electrical engineering. His current research interests include the general area of power electronics and energy conversion, with particular emphasis on converter topologies, modeling, control, and applications.
Dr. Leipo Liu graduated from Henan Normal University, China in 2004. He received his M. Sc. degree from Henan Normal University in 2007 and Ph. D. degree in control theory and control engineering from Shang-hai Jiao Tong University, China in 2011. His research interests include sliding mode control, robust control and differential inclusion systems.
Pro. Zhumu Fu, obtained the Ph. D. degree in control theory and control engineering from Southeast University, Nanjing, China, in 2007. His research interests include complicated control system and new energy control systems.
Dr. Jiangtao Fu (M’94) received the B. S. degree from Nanjing University of science and technology, Nanjing, China, in 1997, the M. S. degree from Nanjing University of science and technology, Nanjing, China, in 2004, and the D. S. degree from Henan University of science and technology, Luoyang, China, in 2019, all in control engineering. He is currently an Assistant Professor in the Department of Electrical Engineering at Henan University of science and technology. His research focuses on the areas of control theory and control systems applications in vehicles, power distribution automation, and modeling and simulation of vehicles and power systems.
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