Batch process PI-PD control method for state space prediction function control optimization

A predictive function control, PI-PD technology, applied in the field of automation, can solve problems such as reducing batch production qualification rate, large overshoot and oscillation

Active Publication Date: 2014-04-30
HANGZHOU DIANZI UNIV
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Problems solved by technology

At present, the common control method in the batch process is still PID control, but when the input is a step signal, the o...

Method used

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  • Batch process PI-PD control method for state space prediction function control optimization
  • Batch process PI-PD control method for state space prediction function control optimization
  • Batch process PI-PD control method for state space prediction function control optimization

Examples

Experimental program
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Effect test

Embodiment Construction

[0066] Take the temperature object control in the reboiler in a batch distillation column as an example:

[0067] The temperature object in the reboiler in the batch distillation column is a process of first-order inertia plus pure lag, and the adjustment method is to adjust the opening of the steam valve. The temperature in the reboiler is controlled by controlling the amount of steam entering.

[0068] Step (1). Establish the state-space model of temperature object in the reboiler in the batch distillation tower, concrete method is:

[0069] a. Establish a real-time database of temperature objects in the reboiler, and establish a local prediction model through the real-time database. The specific method is: collect the real-time operation data of the temperature objects in the reboiler through the data acquisition device, and use the collected real-time process operation data as Data Driven Sample Collection in, Indicates the opening degree of the i-th group of steam va...

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Abstract

The invention discloses a batch process PI-PD control method for state space prediction function control optimization. The method includes the steps that firstly, a state space model of a temperature object in a reboiler is established on the basis of real-time operation data of the temperature object in the reboiler in a batch distillation column, and basic object features are extracted; secondly, parameters of a corresponding PI-PD controller are set according to state space prediction function control features; finally, PI-PD control is performed on the temperature object in the reboiler. According to the method, the state space prediction function control performance is assigned to PI-PD control, and therefore the performance of a traditional control method is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of automation and relates to a batch process PI-PD control method optimized based on state space predictive function control (SSPFC). Background technique [0002] Batch process, also known as batch production process, is a common production method in modern industry and is widely used in biopharmaceuticals, pharmaceutical production and refined chemical processes. In recent years, with the higher and higher requirements for multi-variety and high-quality production, people pay more and more attention to the batch process. At present, the common control method in the batch process is still PID control, but when the input is a step signal, the object of the batch process often produces large overshoot and oscillation, which may reduce the qualified rate of batch production. If for the batch process object, first add PD control to the inner loop, suppress its overshoot first, and then add PI control to the ou...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 张日东李海生邹洪波郑松吴锋
Owner HANGZHOU DIANZI UNIV
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