Three-phase current PID control method for electric smelting magnesium furnace based on high-order nonlinear terms

The invention belongs to the technical field of metallurgical industry process control, in particular to a three-phase current PID control method for an electric smelting magnesium furnace based on high-order nonlinear terms. The method includes the steps of collecting real-time data of the smelting process of the electric smelting magnesium furnace, establishing a smelting process electrode current mechanism model according to the rotating frequency of the motor and the electrode current, eliminating the influence of the change rate of the high-order nonlinear terms by designing a compensatorfor eliminating tracking errors, obtaining a electric smelting magnesium furnace electrode current controller which is composed of a PID controller, a previous-stage high-order nonlinear term compensator and a high-order nonlinear term change rate compensator. According to the method, the current control precision can be improved, and the process requirements can be met. 本发明属于冶金行业过程控制技术领域，尤其涉及种基于高阶非线性项的电熔镁炉三相电流PID控制方法。该方