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Complex process control system design and control strategy

Author: ZhangQianFei
Tutor: WangHaiMei
School: Nanjing University of Technology and Engineering
Course: Control Theory and Control Engineering
Keywords: Process Control System Identification Fuzzy PID Control Logic Control Decoupling Control
CLC: TP273
Type: Master's thesis
Year: 2012
Downloads: 147
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Abstract


Industrial production process, the prevalence of complex processes , such processes has many features such as variables and large delay , so that the conventional control strategy is difficult to obtain satisfactory control effect. Thesis Zhejiang controlled CS4000 advanced process control device for the study, to JX-300XP DCS for the control system , focusing on the complex process control system design process and its control strategy research. Thesis are as follows: ( 1 ) identification of a number of process objects of mathematical models , including: the use of step response curve method was used to establish a dual capacity cascade level object , the object level dual capacitive coupling mathematical model ; using rectangular impulse response curve method to establish a mathematical model of the object temperature . ( 2 ) Design the system in charge of road traffic and level control system for an automatic selective study the PID control strategy in the control system application . Selectivity for automatic control systems, research papers and a fuzzy control parameter self-tuning PID control strategy ( referred to fuzzy PID control strategy ) , the simulation results show that the control strategy of the system under the action of the presence of more than poor, through further improvement, containing added using the integral term improved fuzzy PID control strategy , effectively eliminating the residual error . ( 3 ) classical PID control strategy although widely used, but for large delay object, often prone to large overshoot or larger magnitude shocks . Paper discusses the variable parameter PID control strategy and dual closed-loop control strategy logic process in large delay in the application of these two strategies can intelligently according to the deviation range adjustment control parameters , and thus the strength of the role of regulation and control . Temperature with time delay process control system operation results show that these two strategies than traditional PID control algorithm with good results . CS4000 device for circulating water due to the temperature of an object caused by a non- self-regulating characteristics , the paper proposes an improved Smith predictive control strategy, simulation results demonstrate the feasibility of this strategy . ( 4 ) designed a pair of capacitive coupling level control system , discussed the traditional decoupling control strategy . Taking into account the ease of implementation strategies , a class of coefficients in the form of pure decoupling strategy , system operation results show the effectiveness of the control strategy of ease of implementation .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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