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The Active Disturbances Rejection Control of Two Typical Thermal Objects

Author: ZengJian
Tutor: ChenHong
School: Chongqing University
Course: Power Engineering and Engineering Thermophysics
Keywords: ADRC control Steam generator Water level control Pulverizing system Decoupling Control
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 55
Quote: 0
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Abstract


Thermal system with strong coupling, large delay, the complex nature of the time-varying and nonlinear serious, and it is difficult to establish a reliable system mathematical model of the dynamic process, leading to the traditional control method is difficult to obtain desired control requirements. ADRC Control (Active Disturbances Rejection Control, ADRC) simple structure, and has the ability to compensate disturbance estimated, can effectively suppress the disturbance control effect to overcome the dependence on the mathematical model, and has good robust performance. In this paper, a nuclear power plant steam generator (SG) water level and milling system of thermal power units of two typical thermal process ADRC control problems. SG water level control object not only has obvious nonlinear, time-varying and uncertainty, but also the existence of the phenomenon of \In this paper, the main problems of SG water level control process, a SG water level ADRC system. Process analysis based on the SG water level changes, tectonic SG water level control structure of the generalized equation of state of the object, and the generalized equation of state based SG water level in the second ADRC system. The control system uses the extended state observer of the system of \Disturbance of feedwater flow disturbance and steam flow disturbance in the water level as well as significant changes of system load conditions, SG water level control system ADRC simulation test. The results show that, the established SG water level ADRC control system has good quality, and can effectively suppress the phenomenon of \The ball mill pulverizing system is a thermal power plant equipment and one of the major energy-consuming equipment. Ball mill pulverizing system with multi-variable, strong coupling, when degeneration, and difficult to establish a dynamic process mathematical model characteristics of effective application of the conventional method of control is difficult to obtain in the milling system. Object structure analysis based on ball mill, ball mill pulverizing system as composed by two single-loop temperature loop with negative pressure loop, and loop dynamic coupling between each single-loop system seen as external disturbances. ; to each single-loop control object, as an independent design ADRC controller decoupling control system of ball mill pulverizing ADRC. The ADRC controller perturbation estimated capacity of the control system to estimate the dynamic coupling between the loop and the feedforward compensation in the form of decoupling control of the ball mill pulverizing system. The simulation test examines the control performance of the control system, and compared with conventional PID decoupling control system, and confirmed the effectiveness of the the designed milling ADRC decoupling control system. This article will self-immunity control technology applied to complex thermal process control can effectively suppress the disturbance control effect, significantly reduce the control system for the dependence of the object model provides a new control system for the design of thermal processes ideas.

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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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