In this thesis, a Multi Input-Multi Output (MIMO) model of a utility boiler turbine generator unit is considered. Drum steam pressure, electric power and drum water level (as the output variables) are controlled by manipulation of valves position for fuel, feed water and steam flows. The boiler- turbine generator is a complex, multivariable and dynamic system. The control of boiler-turbine-generator using conventional Proportional-Integral-Derivative (PID) controller is a challenging task. Due to the fact that, PID controller could work well in one operating condition and cannot continuously adapt the changes in the process dynamic. To overcome this problem, a more sophisticated controller that could work well over a wide range of operating conditions and adaptive in nature is need for such systems. The aim of this thesis is to design Lyapunov rule based model reference adaptive controller with decoupler for boiler-turbine-generator. Using the decoupler, the MIMO boiler turbine generator is transformed into three independent single input-single output (SISO) systems, and the interaction is compensated and the controller parameters are adjust automatically using adaptive adjustment mechanism in such a way that the error between reference model output and actual output of the boiler turbine generator is minimized. The decoupled boiler turbine generator model is controlled adaptively based on lyapunov rule and simulated using MATLAB/SIMULINK and its performance characteristics is compared with conventional PID controller. The simulation results have shown that the performance response of the system using model reference adaptive controller (MRAC) for steam pressure in terms of the rise time, settling time and overshoot are improved by 63.25%, 86.04% and 66.82% respectively as compared to that obtained using PID controller. For the case of output power in terms of the rise time, settling time and overshoot are improved by 65.75%, 84.2% and 47.89% respectively as compared to that obtained using PID controller. And for drum water level, in terms of the rise time, settling time and overshoot are improved by 66.87%, 88.06% and 54.66%, respectively as compared to that obtained using PID controller. Generally, from the simulation results, it can be conclude that MRAC has better performance and is more stable than PID controller.
DESIGN OF LYAPUNOV RULE BASED MODEL REFERENCE ADAPTIVE CONTROL WITH DECOUPLER FOR BOILER- TURBINE-GENERATOR
05.01.2019
doi:10.20372/nadre:1548851609.4
Hochschulschrift
Elektronische Ressource
Englisch
DDC: | 629 |