| The electrode regulator system is mainly responsible for the vertical adjustment of the electrode tip displacement according to specified set-points. However, because of strong coupling among three electrodes, the other two electrodes could be affected when the position is adjusted in one phase. Consequently, three electrodes are very difficult to keep stable which lengthen electrode adjusting time and increase energy loss. Therefore, it is necessary to do some research work on decoupling control of EAF.The models of the AC arc, three-phase power supply system and hydraulic system are firstly established according to analyzing the mechanism of EAF electrode regulator system. Aiming at the decoupling control demand of electrode regulator system for EAF, three control strategies of electrodes are thoroughly analyzed. The results show that constant impedance control strategy can weaken three-phase coupling action.The decoupling controllers of EAF are designed as follows:Nonlinear model is approximately linearized by applying Taylor series expansion. Such a linear approximation is done in the neighborhood of a chosen set of operating points. Then the electrode regulator system is decoupled by diagonal decoupling method. However, the controller is not fit for different working stage and it needs design the controller over again when the working stage is changed.Because of the imperfection of diagonal decoupling method, another two decoupling controllers are presented, one is single neuron adaptive decoupling controller, another is neural networks fast adaptive decoupling controller. It takes conclusion from MATLAB simulation results that the former controller can reduce the phenomena of coupling by inducing large oscillations. The latter can remove the coupling among the three electrodes very fast and restrain the short-circuit disturbance successfully. Therefore, neural networks fast adaptive decoupling controller is of great value in electrode regulator system. |
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