Solar Field Modeling and Temperature Control of Yazd ISCC Power Plant
Currently, Yazd ISCC power plant consist of two gas units and is planned to have one steam unit being in cooperation with one parabolic through solar collectors plant acting as an auxiliary power generator. Since the solar field is a distributed system it exhibits time delays in its dynamic characteristics. Because of the extension of the solar field and significant distance between the temperature sensors and control valves, the time delays are relatively long and also varying with respect to time, as a result of oil flow variation. The temperature of the outlet oil and the outlet steam water„ of solar boiler should be regulated with respect to the designed reference commands. In the meantime, the existence of long and variable time delays make the closed loop control strategies challenging. In this thesis, a GPC control scheme for the system is proposed using dynamical modeling and simulation of the solar field. First the derived models of the system components are verified through a simulation study. Then the closed loop response of the system using conventional PI controller and GPC controller are compared. The obtained results show the effectiveness of the proposed controller scheme and its performance robustness with respect to the variation of time delays and system parameters. On the other hand for closed loop system with short time delay, conventional PI controller is well performed, and is preferred due to its simplicity of implementation.
|2002||M.Sc.||Dynamical Systems Analysis and Control|