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Other Titles: Compensation of the PI-controller Integral Windup in the Mold Level Control System for Continuous Casting Machine
Система управління рівнем металу в кристалізаторі машини безперервного розливу заготівок
Authors: Волуева, О.С.
Volueva, O.S.
Волуєва, О.С.
Keywords: mold
metal level
integral windup
control system
mathematical model
рівень металу
інтегральне насичення
не лінійність
ПІ- регулятор
математична модель
уровень металла
интегральное насыщение
математическая модель
Issue Date: 2013
Publisher: Донецький національний технічний університет
Citation: Наукові праці Донецького національного технічного університету. Серія: Обчислювальна техніка та автоматизація. Випуск 2 (25). - Донецьк, ДонНТУ, 2013. С - 13-20
Abstract: Рассматривается система регулирования уровня метала в кристаллизаторе МНЛЗ при помощи стопорного механизма. Используется принцип подчиненного управления с ПИ законом регулирования. Улучшение качества переходных процессов в неустановившемся режиме достигается за счет компенсацииинтегрального насыщения. Методом компьютерного моделирования установлено, что использование подсистемы компенсации интегрального насыщения позволяет уменьшить отклонение уровня метала в кристаллизаторе от заданного значения в нестационарных режимах работы.
Description: The efficiency of the continuous casting machine (CCM) and the total quality of billet is primarily determined by the dynamic processes taking place in the mold. High stability of continuous casting process is a requirement for high-quality billet. Fluctuations of the metal level in the mold lead to significant violation of the casting process, which in turn leads to a deterioration in the quality of production (defects occur in the internal structure of the ingot and non-metallic inclusions appear). The problem of maintaining the level of metal in the mold can be solved in several ways, the most common of these is the application of an automatic flow control system supplied from the tundish through the stopper mechanism. The main purpose is to reduce metal fluctuations in the mold during transient regime by improving the system of automatic control. To achieve this purpose it is required to develop a controller with integral windup compensation for the automaticlevel control system of molten metalin acontinuous castingmold. To maintain the level of metal in the mold with high accuracy, it is reasonable to use the principle of the cascade control. Inner control loop - control of the stopper’s position.The main requirement for this loop - high speed and accuracy of the stopper’s movement. External (main) control loop is to compensate the deviation of the metal level due to disturbances and to ensure the required accuracy of regulation. The object of study is the external control loop for automatic metal level control in the mold of slab continuous casting machine. Control structure is based on the principle of feedback control. The most accepted PI-controller was chosen as the most relevant because of its simple construction, implementation and transparent performance. The mathematical model of the cascade level control using stopper mechanism in the mold was developed. PI control law is applied as control law. Analysis of simulation results showed that the developed mathematical model adequately reflects the dynamic processes. The model enabled the studyof influence of conditions of the effect of integral windup PI(D) controller in a system with non-linearities. It isproposed to use the subsystem of windup compensation. Westudied the influence of the values of the loop transfer gain on the transitional processes in the system. The coefficient variated within wide limits, whereby the optimum range for the system has been experimentally chosen. The study revealed that there is a limit, after which the change in this gain value has no positive effect on the dynamics of the process.
ISSN: 2075-4272
Appears in Collections:Випуск 2 (25)'2013
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