| Being an energy-intensive industry, various measures for reducing power consumption has been introduced in aluminum production, among which using large prebake cells and adopting advanced rectifying technique to stabilize pot current are two principal approaches. Currently, stabilized current technique is being used in soderberg pots to improve power supply status as well as lower power consumption.In the background of design and development of stabilized current control technique, this paper, in light of production practice that aluminum smelters usually supply power to potline with large-power diode rectifying device, voltage adjustment and automatic current stabilization method which could be labeled as "stabilized current technique with loaded voltage regulation by rectifying transformer-diode-saturated reactor", proposes to substitute PLC stabilized current control for traditional analog circuit stabilized current control. In addition, the paper also illustrates the fundamental theory and realization of PLC stabilized current control system as well as analyzes the system's difficulty points, controlling approach and optimal selection of controlling algorithm. By discoursing upon development tool, selection and configuration of database, the paper initiates an overall system plan based on P1 adjustment. The technical plan allows to constitute a tandem control imbedded with big closed-loop and small closed-loop, upon which the design and adjustment of the system us completed.The system mainly consists of two subsystems, i,e., single stand stabilized current control and potline current control. The double closed-loop control functioned as a key part of the whole system is supposed to receive feedback information and emend the error of the set value by utilizing the measured data, The system has been successfully put into application in Lanzhou Aluminum Company Limited. |
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