Sliding mode control of drum water level in an industrial boiler unit with time varying parameters: A comparison with H∞-robust control approach

2012 ◽  
Vol 22 (10) ◽  
pp. 1844-1855 ◽  
Author(s):  
Hamed Moradi ◽  
Majid Saffar-Avval ◽  
Firooz Bakhtiari-Nejad
Keyword(s):  
Robust Control ◽  
Sliding Mode Control ◽  
Water Level ◽  
Sliding Mode ◽  
Time Varying ◽  
Boiler Unit ◽  
Varying Parameters ◽  
Control Approach ◽  
Time Varying Parameters ◽  
Industrial Boiler

Using Sliding Mode Control to Adjust Drum Level of a Boiler Unit With Time Varying Parameters

2010 ◽  
Author(s):  
Hamed Moradi ◽  
Firooz Bakhtiari-Nejad ◽  
Majid Saffar-Avval ◽  
Aria Alasty
Keyword(s):  
Water Level ◽  
Transfer Functions ◽  
Sliding Mode ◽  
Operating Conditions ◽  
Model Parameters ◽  
Feed Water ◽  
Time Varying ◽  
Boiler Unit ◽  
Varying Parameters ◽  
Time Varying Parameters

Stable control of water level of drum is of great importance for economic operation of power plant steam generator systems. In this paper, a linear model of the boiler unit with time varying parameters is used for simulation. Two transfer functions between drum water level (output variable) and feed-water and steam mass rates (input variables) are considered. Variation of model parameters may be arisen from disturbances affecting water level of drum, model uncertainties and parameter mismatch due to the variant operating conditions. To achieve a perfect tracking of the desired drum water level, two sliding mode controllers are designed separately. Results show that the designed controllers result in bounded values of control signals, satisfying the actuators constraints.

Quasi-Sliding Mode Control for Impulsive Delayed Vehicle Longitudinal Following System with Bounded and Varying Parameters

2013 ◽  
Vol 300-301 ◽  
pp. 1436-1443
Author(s):  
Xiao Hui Xu ◽  
Wen Chao Fu ◽  
Ji Ye Zhang ◽  
Wang Xi
Keyword(s):  
Sliding Mode Control ◽  
Drag Coefficient ◽  
Sliding Mode ◽  
Impulsive Effect ◽  
Time Varying ◽  
Varying Parameters ◽  
Mode Control ◽  
Look Ahead ◽  
Automated Highway ◽  
Highway System

In the real automated highway system, various factors to vehicles which are moving make the velocity of vehicles change suddenly. In this paper, assuming that the mass of vehicles, the drag coefficient and the resistance of the ground were uncertain, the controller for a class of time-varying delayed look-ahead vehicle longitudinal following system with impulsive effect was designed by using the idea of quasi-sliding mode control. An example is given at last to test the controller proposed in this paper.

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