Control of a Three-Phase to Single-Phase Back-to-Back Converter for Electrical Resistance Seam Welding Systems
Simon Kissling,
Elie Talon Louokdom,
Frédéric Biya-Motto,
Bernard Essimbi Zobo,
Mauro Carpita
Affiliations
Simon Kissling
Development of Power Electronics Systems (DEPsys), Route du Verney 20B, 1070 Puidoux, Switzerland
Elie Talon Louokdom
Laboratory of Electronics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
Frédéric Biya-Motto
Laboratory of Electronics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
Bernard Essimbi Zobo
Laboratory of Electronics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
Mauro Carpita
Département des Technologies Industrielles (TIN°), Haute école spécialisée de Suisse occidentale (HES-SO), University of Applied Sciences of Western Switzerland, Route de Cheseaux 1, CH-1401 Yverdon-les-Bains, Switzerland
DC link back-to-back converters are widely used in industrial applications. This interest comes from their power factor unity capability on the utility grid and to maintain regulated output parameters, thanks to the decoupling between the grid and the load side. In this paper, a 150 KVA prototype of DC link back-to-back converter for electrical resistance seam welding applications is described. The focus of the paper is on the control strategy developed to absorb constant power from the three-phase utility grid. The key idea is to allow the voltage on the DC bus to vary in order to avoid the propagation at the input side of the pulsed power required by the load. An estimation procedure of the load parameters is presented too. The effectiveness of this control scheme has been proved by simulations and tests.
