Robust and Nonlinear Control of the Boiler-Turbine Unit Performance in a Coal Fired Ultra-Supercritical Once Through Boiler Power Plant in Order to Optimize the Uncertain Problem

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Esmaeili, Mohammad | 2022

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 55070 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Moradi, Hamed
Abstract:
Nowadays electricity power has a key role in developing various aspects of the world. The great importance of fossil fuel power plants come from their large contribution in electricity power generation. Among the different fossil fuel power generation technologies, supercritical power plants have great advantages. They are an advanced power generation technology with high plant efficiency, high coal utilization and low emission. Their complexity and existing many unavoidable uncertainty sources in their dynamic such as changes of ambient temperature, climate condition and wear of components make their control challenging. To overcome mentioned problems and achieving a good performance, a nonlinear sliding mode controller (which is basically robust) based on affine nonlinear systems theory with proven Lyapunov stability is designed. Then an optimal robust H_∞ controller based on μ-DK iteration is designed. To investigate the performance of proposed controllers, simulation studies are carried out. Comparison between results reveals the satisfactory performance of both designed controllers in presence of uncertainties
Keywords:
Nonlinear Control ; Optimization ; Robust Control ; Multivariable System ; Boiler-Turbine Unit ; Uncertainty ; Supercritical Power Plants

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