Re: [TRNSYS-users] new - old -controller

[David Bradley <bradley@xxxxxxxxxxxx>]

Florian,
  The "new" control strategy is intended to be used with SOLVER 1. The 
"old" control strategy is intended to be solved with SOLVER 0. The choice 
of SOLVER should depend upon the amount of capacitance that you have in 
your system. Systems that have almost no capacitance are sometimes better 
solved using SOLVER 1 while systems that have significant amounts of 
capacitance (a building, thermal storage tanks, batteries, etc.) are 
usually fine using SOLVER 0. Without changing the SOLVER, you might look at 
your controller dead band temperatures and increase them if possible to 
increase the stability of your controller.
Kind regards,
  David

At 02:35 AM 10/1/2004, hafner wrote:
> Dear users ,
>
> i use the old strategy controller for my simulation,
> and i get sticking problems.
> ***** WARNING ***** UNIT 21 TYPE  2
>  CONTROLLER WAS STUCK  20 PERCENT OF THE TIMESTEPS
>  DURING THE SIMULATION
> also if i let run the siumulation for a month ,i get just warnings
> ***** WARNING *****
>             THE INPUTS TO UNITS       13  18  19  22  26  27  29  30
> 40  41
>             DIFFERENTIAL EQUATIONS     1   2
> WERE NOT CONVERGED WITHIN THE SPECIFIED TOLERANCE AT TIME= 3783.0000
> (for example)
> if i increase the simulation time to two month or a year , the simulation 
> gets terminated.
> so i read in the manaul  about the new strategy controller
> can this controller helps me?
>
> or have someone an idee?
>
> thanks a lot
> floh
>
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> TRNSYS-users@xxxxxxxxxxxxx
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