Complex Process Control System Design And Control Strategy

During the process of industrial production, complex systems commonly exist, while most of these systems own the characteristic of multi-variables or time-delay, which lead conventional control strategy could not effectually work. The dissertation chooses CS4000 experimental equipment of process control as research object, and uses JX-300XP as control system, mainly study the design of process control system and control strategy which used to the complex process.What the dissertation did as follows:(1) Identifyed some mathematical models of process objects, inculding:using step response cure method established mathematical model of dual capacity cascade level object, and double-capacity coupling level object; using rectangular pulse response cure method established the mathematical model of temperature object.(2) Designed a system of main pipeline flow and liquid level of automatic selective control system, and studyed PID control strategy's whitch used in the system. The dissertation studyed a self-tuning PID control strategy whoes parameters are calculated by Fuzzy control (FPID). Simulation results showed that strategies may lead the system hold residual error. And further improvement, used an improved Fuzzy PID with an additional intergration part, that the residual will eliminate effectively.(3) Although classic PID control strategy is used widely, whitch often produced large overshoot or oscillation of larger amplitude when used to the large time delay object. The dissertation discussed the application of a variable parameter PID control strategy and a double loop logic control strategy in the large time delay process. These two strategies' control parameters adjusting by the scope of the deviation, and forther, adjusted the strength of the controller's out. The operation result of temperature of the process control system with time delay show that these two strategies could reach batter results when compared with the traditional PID control algorithm. According to water recycling of CS4000 device, the temperature object with the characteristic of non-self-regulating, the paper presents an improved Smith predictor control strategy, whoes simulation results prove the feasibility of the strategy.(4) Designed a coupling of the two-capacity level control system, and discussed traditional decoupling control strategy's application in the system. Consided an easy realizing of strategy, studyed a pure coefficient form of decoupling strategy, running results show the effectiveness of the control strategy and ease of achievability...