[TRNSYS-users] TRNOPT

[Hemmatabady, Hoofar]

Thank you for your reply. I dont want to use more than one penalty function and I have at least 5 constraints which define relation between variables (e.g.: x+y+z<10). The penalties that you wrote can be specified in TRNOPT as variable boundaries.
For Multi-objective optimization, I look for something inside GenOpt without the need to specify weight factors.

Regards,
Hoofar
________________________________
Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> im Auftrag von leen peeters via TRNSYS-users <trnsys-users at lists.onebuilding.org>
Gesendet: Mittwoch, 17. April 2019 23:23:14
An: TRNSYS users mailing list at OneBuilding.org
Cc: leen peeters
Betreff: Re: [TRNSYS-users] TRNOPT

OK, so in an equation writer in TRNSYS you define:
cost = ....
Efficiency= ...




Penalties:
P1=or(x<a1,x>a2)*10000000000
P2= or(y<b1,y>b2)*10000000000
P3= or(z<c1,z>c2)*10000000000

And you make an overall cost function:
O=a*cost and b* efficiency+P1+P2+P3

then you can play with the values of a and b to see the impact

Does that help?

Leen

On Wed, 17 Apr 2019 at 22:39, Hemmatabady, Hoofar via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>> wrote:

I followed TRNSYS example and defined it the same way. But I have two objective functions (Cost and Efficiency, Multi-Objective).  and by constraint I mean relation between variables. something like:  X+3*Y+Z<10, which can be added to the objective function as penalty. However, when there are man of these constraints, the penalty method is not trustable.  X, Y and Z has minimum and maximum amounts, which are determined in TRNOPT.


Regards,

Hoofar

________________________________
Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org<mailto:trnsys-users-bounces at lists.onebuilding.org>> im Auftrag von leen peeters via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>>
Gesendet: Mittwoch, 17. April 2019 21:48:13
An: TRNSYS users mailing list at OneBuilding.org
Cc: leen peeters
Betreff: Re: [TRNSYS-users] TRNOPT

Hi,

what is your constraint?
How did you define your optimisation function? What doe sit look like?

leen

On Wed, 17 Apr 2019 at 21:39, Hemmatabady, Hoofar via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>> wrote:

Hi Leen,


I can define constraints as penalties in TRNOPT. However, defining penalties instead of constraints does not work when there are many of them. TRNOPT does not have the option for specifying constraints.


How can be the constraints defined in TRNSYS file? and What do you mean by adapting optimization function in TRNSYS?


Best regards,

Hoofar

________________________________
Von: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org<mailto:trnsys-users-bounces at lists.onebuilding.org>> im Auftrag von leen peeters via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>>
Gesendet: Mittwoch, 17. April 2019 21:05:05
An: TRNSYS users mailing list at OneBuilding.org
Cc: leen peeters
Betreff: Re: [TRNSYS-users] TRNOPT

Hi,

why not defining the constraints and penalties in your TRNSYS file? That is how I do it.
multi-objectives is again something I do by adapting my optimisation function in TRNSYS
The last one ... you should try. I have not yet tested that. Genopt calls TRNSYS and then TRNSYS calls EES. If it is possible, you might have to be really careful with the location of your files. Best is to start with a working TRNOPT example. Then add a link to a small routine in EES and build up from there.

Leen

On Wed, 17 Apr 2019 at 20:36, Hemmatabady, Hoofar via TRNSYS-users <trnsys-users at lists.onebuilding.org<mailto:trnsys-users at lists.onebuilding.org>> wrote:

Dear all,


I have the following questions regarding optimization procedure in TRNSYS:


1) How can I define optimization constraints in TRNOPT? (a method is using penalty functions but It does not work for me as I have multiple constraints)


2) Is it possible to do Multi-objective optimization in TRNOPT? if yes, how?


3) Some of my optimization variables come from EES to TRNSYS. Can TRNSYS couple with EES and GenOpt simultaneously?


Best regards,

Hoofar

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