Hi,
I have tried to implement a cold ramp rate for a certain plant in Simulink. Meaning that when the plant has been shut down for more than 3 hours, the start up will take longer. I have implemented this with If- and If action -blocks that include dynamic rate limiter -block. However, there is a problem with the simulation, it only changes the rate of change of the signal for the first cold start up, and not all of them. I have attached figures of the system behaviour. In this example, there are two time instances where the plant should go through a cold start-up. In the first picture, there's the if action block that causes the issue and its contents. The following figures are screenshots of the scopes that are visible in the if action block. Finally, there's a figure of the plants load throughout the simulation. In that figure, you can see that at timestep 51, there's slower increase of load than at timestep 82, even though these should look similiar. Any suggestions on how to fix this?
