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Electric power companies will pay their attention to the load following capability and economical operation of a thermal power plant with once-through boilers. However, conventional PID controllers em...bedded on DCSs (Distributed Control Systems) cannot always give the optimum solution to such subjects. To cope with these problems, we need to develop a model-based steam temperature control system. Prior to study of the advanced control system, we develop a nonlinear system identification method based on the exogenous variable dependent ARX model describing the characteristics of a power plant dynamics under large load changes. We evaluate the accuracy of the proposed model through various simulation tests by using measurement data acquired in the field tests and simulation tests with the SIMULINK-based boiler-turbine dynamic models. We also introduced the model prediction controller with some constraints and verified its effectiveness through the simulation tests.続きを見る
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