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In order to meet the wide-range load tracking requirement and overcome unknown disturbance issues of ultra-supercritical (USC) boiler-turbine unit, an extended state observer based fuzzy model predictive controller is proposed using the techniques of fuzzy scheduling, model predictive control and extended state observer. Local state-space models are established on the basis of nonlinearity analysis...
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...
The performance recovery ability of disturbance observer based control (DOBC) is revealed based on equivalent transfer function transformation. It is found that, with the help of DOB, the open-loop characteristics of perturbed condition can be reshaped as similar to the nominal one. A nonlinear fluidized bed combustor is used to validate the ability. To implement the DOBC in practice, the bumpless...
A compound control strategy is proposed to handle the nonlinear dynamics existing in the power plant fluidized bed combustor (FBC). Based on the linearized model of the FBC, two improved disturbance observers (DOB) are proposed to accommodate the characteristics of time-delay and non-minimum phase (NMP) characteristics. The capabilities of the disturbance observer to handle load disturbances are also...
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