Method for determining control performance of chemical processes with viscous properties of control valves
A technology for chemical process and viscous characteristics, applied in electrical testing/monitoring, etc., can solve problems such as difficulty in guaranteeing, increasing error of control valve viscous characteristics, and inability to completely remove them, achieving easy calculation, improved economic benefits, and optimization effect of setting
Active Publication Date: 2016-01-13
ZHEJIANG UNIV +1
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[0010] The performance evaluation method established based on the above two ideas has limitations in application: First, the method based on the spline smoothing function cannot completely remove the nonlinearity of the process output due to the interpolation function, resulting in performance evaluation results that are greater than the real value, and The error of the viscous characteristic of the control valve increases further; secondly, the method of searching for the equilibrium state of the control valve is more suitable for the control loop with a long enough sticking stage of the control valve, and this control loop is the most important in practical industrial applications. hard to guarantee
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[0046] Taking the performance evaluation of the main heating furnace in the delayed coking production process of a large domestic petrochemical enterprise as an example, the control performance evaluation method of the chemical process with the control valve viscous characteristic of the present invention will be described in detail below.
[0047] Such as figure 1 As shown, the petrochemical process heating furnace is an important link in the production process and one of the main energy-consuming units. The stable control of the furnace outlet temperature is of great significance for improving product quality and reducing energy consumption.
[0048] The heating furnace obtains heat through the supply of gas, and the amount of gas fluctuates according to the change of upstream oil properties. It is necessary to control the air intake to make the gas fully combust to obtain the maximum heat. At the same time, a certain air margin should be ensured, but too much low-temperature...
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The invention discloses a control performance measuring method for a chemical process with control valve stickiness. The control performance measuring method for the chemical process with the control valve stickiness comprises the following steps that (1) in a control loop whose performance is to be evaluated, a set of output observation value sequence yt is collected, and the data length is p; (2) a searching optimization algorithm based on a PSO algorithm is adopted for the output observation value sequence yt to identify the control loop, and a control model of the control loop is obtained; (3) an output prediction value sequence is obtained through calculation according to the control model; (4) an output difference value sequence is obtained through calculation, a model is built for the output difference value sequence, and the minimum variance performance lower limit of the control loop is obtained; (5) the performance of the control loop is evaluated through the minimum variance performance lower limit. The control performance measuring method for the chemical process with the control valve stickiness can completely eliminate a nonlinear part in the output process, is suitable for the control loop with actuator valve stickiness, and can accurately evaluate the control performance of the chemical process.
Description
technical field [0001] The invention relates to the field of industrial control, in particular to a method for measuring the control performance of a chemical process with the viscous characteristic of a control valve. Background technique [0002] Industrial sites usually contain many control loops, and inspection and maintenance of these control loops is a tricky and arduous task in the operation of the production process. According to the survey, there are performance degradation problems in more than 60% of industrial controllers. How to use the daily operation data to measure the performance of the control loop, so as to optimize its settings to obtain more economic benefits, has become a hot spot for many scholars. In recent years, the research on performance monitoring and evaluation of control loops has become a topic of widespread concern in the field of industrial control. [0003] Control performance assessment (Control performance assessment, CPA) is an importa...
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IPC IPC(8): G05B23/02
Inventor 谢磊师明华郭子旭王旭张冬明苏宏业古勇
Owner ZHEJIANG UNIV