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This paper derived a model for the superheated steam temperature based on the open-loop step response. A cascaded control structure based on disturbance observer (DOB) is proposed to accommodate the control difficulties. The simulation results show the great performance improvement compared with the conventional cascaded control structure. This paper is a preliminary research to the cascaded DOB control...
In this paper, an active disturbance rejection control (ADRC) with tracking differentiator (TD) solution is proposed and tested on a certain four operating condition model. The proposed system with a cascaded control scheme is constructed based on a linear Active disturbance rejection controller (LADRC) with parameters optimized under a modified fruit fly algorithm. The tracking performance could...
Circulating Fluidized Bed Boiler (CFBB) is a nonlinear system with large time delay and strong coupling. Faced with the existing problems, a novel active disturbance rejection control (ADRC) design method is proposed based on effective open-loop transfer function (EOTF). The interaction effects for a particular loop from all the other loops are incorporated into EOTFs so that the system can be approximated...
The dynamics of large scale circulating fluidized bed (CFB) boiler power plant shows the behaves of large time delay, complex coupling and nonlinearities, which brings difficulties for controller design to improve the plant performance. This paper firstly introduces a well-established and validated nonlinear model of a 300MWe CFB power plant, and then the model is simplified through analysis and approximation...
The Circulating Fluidized Bed Boiler (CFBB) is a multivariable coupled, long time-delay, large inertia system. In this paper, a decentralized control system using active disturbance rejection control (ADRC) strategy is proposed for a nonlinear CFBB model. The designed control system has a fully decentralized structure and it is free of complex decouplers, which is difficult to achieve in actual plants...
This paper deals with the application of a multivariable nonlinear controller (MNC) to a multivariable nonlinear boiler-turbine unit. The method can asymptotically estimate and compensate the nonlinearity, coupling and disturbances owing to its observation ability. A decentralized MNC system is obtained for a nonlinear boiler-turbine model, and then evaluated under a wide range of operating conditions...
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