RBR Control Strategy for the Closing Process of Intelligent Electromagnetic Contactor

Based on the run-by-run (RBR) control method, this paper studies the closing process of electromagnetic contactor. The purpose of this work is to control the contact bounce and closing time without changing any structure of the contactor. We focus on the speciality of the RBR method applied to the contactor by using the repetitive functioning of electromagnetic contactor. Based on this, the RBR control optimization mathematical model of contactor's closing process was constructed, a complete control flow was proposed and the excitation current and its action time were set. The model does not depend on the specific parameters of the contactor and is highly versatile. The loss function for evaluating the historical operation information of contactor was introduced, which automatically optimize process model and adjust control decisions, and the coil current closed-loop reference sequence of the closing process is iteratively solved, changes the limitations that contactor online operating depends on off-line parameters. In order to make control strategy not limited to an optimal solution, taking into account the uncertainty caused by time-varying, interference, during the operation of the contactor, the decision vector candidate matrix is introduced, always build new optimizations on practical basis so that control remains practically optimal. Related simulation and experiment prove the effectiveness of the proposed strategy, which can effectively reduce the dispersion of the closing time and the bounce of the contact. The research has universal significance for the intelligent control of contactor’s closing process. © 2019 Chin. Soc. for Elec. Eng.