Elizarov, Konstantin

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   Information Technology and Electrical  Engineering - Devices and Systems, Materials  and Technologies for the Future        Faculty of Electrical Engineering and Information Technology    Startseite / Index:  http://www.db-thueringen.de/servlets/DocumentServlet?id=14089 54. IWK Internationales Wissenschaftliches Kolloquium International Scientific Colloquium 07 - 10 September 2009 PROCEEDINGS Impressum  Herausgeber: Der Rektor der Technischen Universität llmenau  Univ.-Prof. Dr. rer. nat. habil. Dr. h. c. Prof. h. c. Peter Scharff  Redaktion: Referat Marketing   Andrea Schneider   Fakultät für Elektrotechnik und Informationstechnik  Univ.-Prof. Dr.-Ing. Frank Berger  Redaktionsschluss: 17. August 2009  Technische Realisierung (USB-Flash-Ausgabe):  Institut für Medientechnik an der TU Ilmenau  Dipl.-Ing. Christian Weigel  Dipl.-Ing. Helge Drumm  Technische Realisierung (Online-Ausgabe):  Universitätsbibliothek Ilmenau    Postfach 10 05 65  98684 Ilmenau  Verlag:   Verlag ISLE, Betriebsstätte des ISLE e.V.  Werner-von-Siemens-Str. 16  98693 llmenau   © Technische Universität llmenau (Thür.) 2009   Diese Publikationen und alle in ihr enthaltenen Beiträge und Abbildungen sind urheberrechtlich geschützt.   ISBN (USB-Flash-Ausgabe): 978-3-938843-45-1 ISBN (Druckausgabe der Kurzfassungen): 978-3-938843-44-4  Startseite / Index: http://www.db-thueringen.de/servlets/DocumentServlet?id=14089  EXPERIMENTAL RESEARCH OF ELECTROHYDRAULIC DRIVE FOR ARC FURNACES ELECTRODES TRANSMISSION SYSTEM   Elizarov Konstantin   Institute for electrical engineering, chair FEMAEK-AETUS Moscow Power Engineering Institute   ABSTRACT  In the paper are considered the technology and the result of performed experimental research of arc furnaces electrodes transmission system and its electrohydraulic drive, and creation their adjusted models. There are given results of experimental measurements on the working 12 t. DC-arc furnace, and  working 25 t. AC- arc furnace. Experiments goal was to acquire electrode-positioning mechanisms hydraulic drives mathematical model and electrodes ends vibrations model, to align those models parameters and to utilize them for arc furnaces power governors’ controller synthesis. According to research results an invention of adaptive arc furnaces power governors was exploited.  Index Terms – arc furnace, control system, modeling, electrical engineering, electrode, drive, electrohydraulic, experimental research, power governor, vibration. 1. INTRODUCTION Arc furnaces are widely used in processing procedures starting with fusible ferrous metals and alloys to ferroalloys production and solid state electricity-nonconductive material casting.   Arc furnaces productivity depends to a considerable degree on electrodes transmission system, which is basically electromechanical (for small capacity furnaces) or hydraulic (for big capacity furnaces). Application of hydraulic electrodes transmission system drive seems to be the most promising, because it makes possible to simplify transmission systems kinematical scheme, and considerably raise furnace processing speed. 2. PROBLEM STATEMENT Usually the problem of acquisition of adequate arc furnace model is solved during furnace control system designing process [1], particularly electrodes Figure 1 Direct Current Arc Furnace DPS-12 © 2009 - 54th Internationales Wissenschaftliches Kolloquiumtransmission systems model should be determined. Electrodes transmission system influences on efficiency, accuracy, stability of arc furnaces control system working, per se electrode transition is the singular accessible control force for automatic control system, especially in alternating current furnace.  Difficulties in adjustment of control system for furnaces with hydraulic drive are conditioned by presence of elements with nonlinear characteristics. They are hydraulic actuator, supply line, hydrocylinder, and electrode holder. It is necessary to hold an experimental investigation to receive adequate model of real processes in electrodes transmission drives, and on the basis of the investigations to identify meaning and influence of each factor and element. However processes connected with electrodes ends vibration (which can reach tens centimeters [2]) can also essentially effect on regime adjustment accuracy (electrical energy specific discharge, melting duration etc.). Existent control systems don’t take into consideration similar processes. Experiments goal was to acquire electrode-positioning mechanisms hydraulic drives mathematical model and electrodes ends vibrations model, to align those models parameters and to utilize them for arc furnaces power governors’ controller synthesis. 3.  SURVEY Experimental research was conducted on working direct current 12 t. arc furnace DPS-12 of Saransk foundry “VKM-Steel”(see Fig.1), and on working alternating-current 25 t. arc furnace of Cheboksary foundry “Promtraktor-Promlit”. Control signals and feedback signals were measured directly on hydraulic units using an oscillograph. Electrode ends vibration was measured using integral accelerometer fixed on furnaces electrode (see Fig. 2). During experimental data processing were acquired hydraulic drives mathematical model (see Fig. 3) and Figure 3 Hydrodrives experimental model build in Matlab Simulink Figure 2 Acceleration measurementFigure 4 Modeling results model of electrode-positioning unit [3]. These models contain essential nonlinearities in control signal playback. These nonlinearities indicate necessity of adaptive control systems usage. Some of modeling results are shown on Fig. 4, where 1- dependence of electrodes speed from time, 2 – dependence of  electrodes movement from time. According to research results an invention of adaptive arc furnaces power governors was exploited. 4. REFERENCES [1] V.P. Rubtsov, M,Y, Pogrebisskiy “Modelling in technics’, Moscow, 2008     [2] A.I.Sapko, “Actuating units of arc furnaces power governors”, Moscow, 1980 [3] K.A.Elizarov “Experimental research of electrohydraulic drive for arc furnaces electrodes transmission system”, Vestnik MEI, Moscow, 2009 

Experimental research of electrohydraulic drive for arc furnaces electrodes transmission system

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Experimental research of electrohydraulic drive for arc furnaces electrodes transmission system

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