Tube mill is the most often used equipment in the powder-making system in power plant at present, the tube mill load control system is an independent system relatively[1]. since the controlled object has the characteristic of large delay, large inertia, nonlinear and time-variant, such complex dynamics, which is hard to build precise mathematics model, and mathematics model change slowly with the quality of coal, so adopting the regular control method basing at that the controlled object is a precise model, such as cascade PID control, Smith pre-estimate control and so on, when the condition changes, the object characteristic changes, it is hard to maintain the primary control quality and meet the control needs[1-3]. The tube mill load controlled object can be equivalent as a function consisting of first-order inertia and pure delay, The traditional methods are cascade PID control, Smith pre-estimate control, as well as advanced internal model control, pre-estimate control and so on, Although they can effectively deal with the characteristic of large inertia, large delay, there are also some obvious disadvantages, for example, cascade PID control is effective in overcoming the disturbance in the system, thus enhancing the speediness of the system, however it is short in controlling the characteristics of large delay, large inertia, time-variant parameters. When the parameters of the model match well, Smith predictive control is effective in controlling the plant with large delay and large inertia, otherwise, the result is not ideal and the nonlinear can not be coped with.
Tube mill is the most often used equipment in the powder-making system in power plant at present, the tube mill load control system is an independent system relatively[1]. since the controlled object has the characteristic of large delay, large inertia, nonlinear and time-variant, such complex dynamics, which is hard to build precise mathematics model, and mathematics model change slowly with the quality of coal, so adopting the regular control method basing at that the controlled object is a precise model, such as cascade PID control, Smith pre-estimate control and so on, when the condition changes, the object characteristic changes, it is hard to maintain the primary control quality and meet the control needs[1-3]. The tube mill load controlled object can be equivalent as a function consisting of first-order inertia and pure delay, The traditional methods are cascade PID control, Smith pre-estimate control, as well as advanced internal model control, pre-estimate control and so on, Although they can effectively deal with the characteristic of large inertia, large delay, there are also some obvious disadvantages, for example, cascade PID control is effective in overcoming the disturbance in the system, thus enhancing the speediness of the system, however it is short in controlling the characteristics of large delay, large inertia, time-variant parameters. When the parameters of the model match well, Smith predictive control is effective in controlling the plant with large delay and large inertia, otherwise, the result is not ideal and the nonlinear can not be coped with.
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