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Signal-driven one-step optimal feed-forward pid control method for electrode current in fused magnesia furnace

A technology of electrode current and fused magnesia furnace, which is applied in the direction of electric controller, controller with specific characteristics, etc., can solve the problems of difficult electrode current control and stability, etc.

Active Publication Date: 2020-08-28
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

[0005] Aiming at the existing technical problems, the present invention provides a signal-driven one-step optimal feed-forward PID control method for the electrode current of the fused magnesium furnace, which can solve the problem that the existing technology is difficult to control the electrode current stably

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  • Signal-driven one-step optimal feed-forward pid control method for electrode current in fused magnesia furnace
  • Signal-driven one-step optimal feed-forward pid control method for electrode current in fused magnesia furnace
  • Signal-driven one-step optimal feed-forward pid control method for electrode current in fused magnesia furnace

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Embodiment Construction

[0064] 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.

[0065] refer to figure 1 , the invention discloses a signal-driven one-step optimal feed-forward PID control method for the electrode current of an electric fused magnesium furnace, comprising the following steps:

[0066] Step 1: Collect real-time data of the smelting process of the electric fused magnesium furnace;

[0067] 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.

[0068] During the smelting process of fused magnesia, the working conditions in the furnace change drastically and the interference is serious. These disturbances have a serious impact on the instantaneous value of the three-phase current, so it is necessary t...

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Abstract

The invention belongs to the technical field of process control in the metallurgical industry, and in particular relates to a signal-driven one-step optimal feedforward PID control method for electrode current in a fused magnesium furnace. The method includes collecting and storing real-time data; establishing an electrode current mechanism model of the melting process based on the motor rotation frequency and electrode current; and establishing a low-order linear model and high-order nonlinear unmodeled dynamics through Taylor expansion of the electrode current mechanism model. The electrode current controller design model is designed; the PID controller is designed for the low-order linear model, and the compensator is designed to eliminate the unmodeled dynamics of the previous beat for the high-order nonlinear unmodeled dynamics; by adopting the one-step optimal feedforward compensation law. Design the parameters of the PID controller and the unmodeled dynamic compensator in the previous shot to obtain the controller of the electrode current of the fused magnesium furnace. Using the above method improves the current control accuracy, reduces energy consumption, and meets process requirements.

Description

technical field [0001] The invention belongs to the technical field of process control in the metallurgical industry, and in particular relates to a signal-driven one-step optimal feed-forward PID control method for the electrode current of an electric fused magnesium furnace. Background technique [0002] Fused magnesia has the characteristics of high melting point, anti-oxidation, complete structure and strong insulation performance. It is an important raw material and refractory material in many industries. There are many manufacturers of fused magnesia in my country, but the level of smelting is backward. The specific smelting process of the electric smelting magnesium furnace is as follows: before smelting, it is necessary to lay the bottom material in the furnace and determine the position of the three-phase electrodes. When the three-phase electrode is adjusted to a proper position, it can supply power to form an arc between the electrode and the bottom material, and...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 吴志伟王维洲柴天佑贾瑶
Owner NORTHEASTERN UNIV LIAONING
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