The characteristics of stainless steel fermenter should be cascade control
2024-03-23 13:06:16
The characteristics of stainless steel fermenter should be cascade control. The characteristics of stainless steel fermenter should be cascade control.
Cascade control
The T: measured signal is composed into a control system, and the output of TC: is used as a given value of the TC2 controller.
It forms a cascade control system.
Compared with single loop control, cascade control has the following characteristics:
(1) When the temperature of the jacket fluctuates due to some external reasons, the effect of TC2 will make this fluctuation not yet
When it is T: it is overcome in advance, so it is beneficial to ensure the control quality of T:. And can significantly improve the control characteristics of the fermenter,
Reduce the equivalent object lag.
(2) Both parameters can be considered to achieve "uniform control: when the proportional ratio of the main controller TC: is selected, the output is
The change is small. Since it is a given value of the secondary controller TC2, the secondary parameter changes are also small and relatively stable.
In this way, both the primary and secondary parameters can be kept gently within a certain range to meet the requirements of the process.
(3) The influence of nonlinear characteristics such as the regulating valve can be eliminated: the regulating valve and a part of the object (sub-control object) are packaged
Contained in the secondary circuit, the non-linear effects of the regulating valve are eliminated in the secondary ring.
Feedforward-feedback control
The disturbance signal of the cooling water temperature is applied to the regulating valve together with the output signal of the TC. controller, and the feedforward is formed.
- feedback control, so that the disturbance of the temperature change of the cooling water can quickly act on the regulating valve to make adjustment
The valve is also adjusted accordingly to eliminate this interference in time. But it should be noted that the feedforward compensator needs to have an accurate number.
Learn the model as a basis.
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