Transport Delay of Zero

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Shane Cheshire
Shane Cheshire 2020-3-3
评论： Robert U 2020-3-4
I have the following block diagram.
My step input is set to 1000 sec. By changing the TM value in the I'm attempting to get the following graph. One with tm=1000 and the second with tm= 0. This is the graph I'm supposed to get for the block without preditictive control.
Instead this is what I'm getting
I'm getting an error when I set the transport delay to zero, it says that there maybe an algrebraic loop. Any idea how I might fix this?
  2 个评论
Jade O'Connor
Jade O'Connor 2020-3-4
It should work if you move the time delay block into the feedback loop :)
Robert U
Robert U 2020-3-4
Hi Jade,
Your suggestion probably does not work, either, when setting the time delay to Zero.
Kind regards,
Robert

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回答（1 个）

Robert U
Robert U 2020-3-4
编辑：Robert U 2020-3-4
Hi Shane Cheshire,
There is plenty of hints in Matlab documentation on how to fix algebraic loops. Most conveniant is to introduce a unit-delay block that will delay the feedback signal by one time step. That usually does not have any significant impact on the simulation result.
Doc: Remove Algebraic Loops
Another option is to use very small signal delay times. But this option might increase simulation time dramatically.
Kind regards,
Robert

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