Performance evaluating method suitable for PID control loop in tobacco processing process

A control loop and process technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problem of unable to obtain the optimal solution, the objective function does not consider the cost effect, the calculation speed is slow, etc.

Active Publication Date: 2016-02-17
ZHENGZHOU TOBACCO RES INST OF CNTC
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Problems solved by technology

However, this method has the following main problems in actual use: First, the traditional optimization calculation method is easy to fall into the local optimum, unable to obtain the global optimal solution, or even the optimal solution, and the calculation speed is

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  • Performance evaluating method suitable for PID control loop in tobacco processing process
  • Performance evaluating method suitable for PID control loop in tobacco processing process
  • Performance evaluating method suitable for PID control loop in tobacco processing process

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0044] Taking the outlet moisture control circuit of SH625 shred drying machine (scale flow rate before drying 5400kg / h) in a cigarette factory as the evaluation object, the specific steps for performance evaluation of the outlet moisture PID control loop within a batch are as follows ( image 3 ):

[0045] (1) Select the moisture control loop at the outlet of the silk drying process as the evaluation object, and conduct an equivalent single-loop PID loop analysis on the moisture cascaded PID loop ( figure 2 shown), determine the operating data as the controlled variable outlet moisture and the controlled variable steam pressure;

[0046] (2) When a batch of shredded tobacco has completely entered the drying machine (that is, the normal production stage), set the rotating speed of the drying drum to 28r / min; keep the opening of the damp damper at 69.50%, an...

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Abstract

The invention relates to the related technical field of tobacco processing process control, in particular to a performance evaluating method oriented to a PID control loop in the tobacco processing process. The performance evaluating method is characterized in that oriented to the PID control loop in the tobacco processing process, a blended genetic algorithm combining a genetic algorithm and a correction Newton method is proposed to optimize and calculate the minimum variance capable of being achieved by a PID controller, the situation that a traditional optimization algorithm is likely to fall into local optimization is avoided, and the local searching optimization capability of the algorithm is also improved; in addition, punishment of cost control is taken into consideration in a target function, and the changes of control action are also considered in calculation of the minimum variance, so that more objective and more efficient performance evaluating indexes are obtained, and the process control performance monitoring level is increased. By means of the method, equivalence analysis can be carried out on the series PID loop in the tobacco processing process, so that the application range of the method is effectively widened, the process control performance evaluating capability is improved, and the more objective and more efficient performance evaluating indexes are obtained.

Description

technical field [0001] The invention relates to the related technical field of tobacco processing process control, in particular to a performance evaluation method for a PID control loop in the tobacco processing process. Background technique [0002] Since Harris proposed to use the closed-loop output variance under the action of the minimum variance controller as the controller performance evaluation benchmark (CanJChemEng, 1989(67): 856-861), since then most of the research has been carried out around this benchmark, but little attention has been paid to its impact on a problems of applicability to a specific type of controller. In the process control of tobacco processing, more than 90% of the controllers are PID controllers, and the study found that due to its own structure, even a well-tuned PID controller, its output generally cannot reach the variance under the control of the minimum variance controller. , if the minimum variance control standard is used to evaluate...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 陈孚梁伟朱文魁徐大勇邓国栋李善莲张玉海陈良元张彩云刘朝贤
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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