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电渣重熔(ESR)是一种特殊的冶金技术,广泛应用于特种金属和合金钢的生产。高质量的ESR钢坯要求电极熔化速率和电极浸没深度在冶炼过程中获得均匀控制。由于ESR是一个具有时变、不确定和强耦合动态特性的复杂系统,采用传统的控制方法是很难有效地实现相应的控制任务。为了解决电渣重熔过程的控制难题,提出了一种扰动解耦控制方法,该方法基于自抗扰技术拟抑制电渣重熔过程的参数变化和耦合效应。此外,该方法采用低通滤波器来限制控制信号的变化率,使得电渣重熔过程控制带宽得以扩展,以进一步提高该方法的鲁棒性和抗干扰能力。仿真结果表明,该方法不仅具有较好的解耦性能,而且对模型参数的不确定性和外扰具有较强的鲁棒性和适应性。
Electroslag remelting (ESR) is a special metallurgical technology that is widely used in the production of specialty and alloy steels. High quality ESR billet requires uniform control of electrode melting rate and electrode immersion depth during smelting. Because ESR is a complex system with time-varying, uncertain and strongly coupled dynamic characteristics, the traditional control method is difficult to effectively control the corresponding tasks. In order to solve the control problem of ESR process, a disturbance decoupling control method is proposed. This method is based on ADRC technology to suppress the parameter variation and coupling effect of ESR process. In addition, this method uses a low-pass filter to limit the rate of change of the control signal so that the control bandwidth of the ESR process can be extended to further improve the robustness and anti-interference ability of the method. Simulation results show that this method not only has better decoupling performance, but also has strong robustness and adaptability to model parameters’ uncertainty and disturbance.