Researching of frequency-controlled electric drive of the mechanism of movement of electrodes of ASF-3 furnace by mathematical modeling
DOI:
https://doi.org/10.34185/1562-9945-4-129-2020-05Abstract
Well-known studies of the drive of electrode movement are performed using mathematical modeling, in particular, the main purpose of the above developments is the construction of optimal control systems of operating regulators of electric arc furnaces in order to improve the technical and economic performance of production. The possibility and expediency of using a frequency-controlled actuator of the mechanism of electrode movement in the general form of use is substantiated from the point of view of energy saving by means of the actuator. The purpose of this work is a detailed development of the structural and functional scheme of the drive mechanism for the movement of electrodes with an automatic controller on the example of ASF-3 furnace molding shop DMZ based on the use of modern frequency converters, compilation of mathematical model of the actuator and proposed, comparative analysis of the quality of the drive control system, according to DC and AC. Asynchronous motor 6AMU100SP and frequency converter VFD22C43A are offered as a drive, which allows implementing both scalar and vectoring control of the actuator. On the basis of the analysis of the technological process, the algorithm of operation of the electric drive of the mechanism of movement of the electrodes of the furnace, a functional scheme of automation on the AC system was drawn up. Literature devoted to the modernization of control systems, controllers and variable-frequency drive mechanism for movement of the electric arc furnace electrodes are considered. The research of current and proposed drives through mathematical modeling. Models of the control system of the electrode mechanism for the basic and proposed variants with scalar and vectoring control are made in the MATLAB software. Survey on simulation models confirmed that the system provides vectoring control speed transient time 16% less than the DC system and a static error is 0% to 3%. The implementation of the electric drive of the mechanism of movement of electrodes based on the frequency converter with vector control and an induction motor is a promising direction of modernization.
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