Control method
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I have a complex control loop that requires maintaining two main parameters stable. A change in either of the two main parameters will cause adjustments in the actuators of the secondary parameters; how is this achieved? Has anyone encountered such complex series connections?
It’s not clear what the original poster wants to convey
A typical cascade system has a primary parameter and a secondary parameter； Now, I need to ensure that the two main parameters remain stable: pressure and temperature. Traffic is a secondary parameter
I hope the original poster can explain the question more clearly, such as what the measurement points are, and whether the process involves heating or cooling, etc. Otherwise, I don’t dare to give you random answers.
:) It’s about using an MV to control two CVs, right? You need to have a priority principle – determining in what ranges it’s necessary to prioritize the stability of one CV, similar to selection and override control. Because in the vast majority of cases, it is not possible to adjust an MV to perform fixed-value control on two CVs
It is necessary to explain the process flow clearly, define the control requirements, and then discuss what control loops to use and how to adjust the parameters.
Then the poster must be considering the use of three-momentum control; however, with this approach there is also only one main parameter – although other parameters can be adjusted as well, they serve as reference values. Unless as mentioned on the 5th floor, interval judgment should be used to create two main loops, with each loop adjusting one of the variables to serve as the primary parameter.