Three-phase current PID control method for electric smelting magnesium furnace based on high-order nonlinear terms
A nonlinear term, the technology of fused magnesia furnace, applied in the field of three-phase current PID control of fused magnesia furnace, can solve the problems of difficult electrode current control and stability, etc.
Active Publication Date: 2018-08-17
NORTHEASTERN UNIV LIAONING
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[0005] In view of the existing technical problems, the present invention provides a three-phase current PID control method for fused magnesium furnaces based on high-order nonlinear terms, which can solve the problem that the existing technology is difficult to control the electrode current stably
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[0085] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0086] refer to figure 1 , the invention discloses a three-phase current PID control method for a fused magnesium furnace based on a high-order nonlinear term, comprising the following steps:
[0087] Step 1: Collect real-time data of the smelting process of the electric fused magnesium furnace;
[0088] First, the real-time data is collected and stored. The real-time data to be collected includes: the instantaneous value of the electrode current and the motor rotation frequency.
[0089] During the smelting process of fused magnesia, the electrode current changes randomly with the change of raw materials and the smelting process, and is subject to frequent random interference. These disturbances have a serious impact on the instantaneous value of the three-p...
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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.
Description
technical field [0001] The invention belongs to the technical field of process control in the metallurgical industry, and in particular relates to a three-phase current PID control method for an electric fused magnesium furnace based on high-order nonlinear terms. Background technique [0002] Fused magnesia has compact structure, high melting point, anti-oxidation and strong insulation. It is the main raw material for refractory materials required in manufacturing, metallurgy, chemical industry, electrical equipment, aerospace industry and other industries. The fused magnesia uses magnesite ore as the original ore, and is smelted by a submerged arc fused magnesia furnace unique to my country. During the smelting process, the control system controls the three-phase electrode by adjusting the position between the three-phase electrode and the liquid surface of the molten pool. The current tracks the melting current to generate an arc, and the raw ore in the furnace is heated a...
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IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 吴志伟王维洲柴天佑丁进良王良勇陈水城
Owner NORTHEASTERN UNIV LIAONING