[TRNSYS-users] TRNOPT

Wed Apr 17 17:25:48 PDT 2019

Hi Hoofar,

Why not try jEPlus+EA
(http://www.jeplus.org/wiki/doku.php?id=docs:jeplus_ea:features)? It
supports TRNSYS and is based on a proper constrained multi-objective
algorithm. The documentation on the website is scant and a bit outdated,
though. And, you need to start with jEPlus before moving on to jEPlus+EA.

Regards,

Yi

From: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] On
Behalf Of Hemmatabady, Hoofar via TRNSYS-users
Sent: 17 April 2019 23:06
To: TRNSYS users mailing list at OneBuilding.org
Cc: Hemmatabady, Hoofar
Subject: Re: [TRNSYS-users] TRNOPT

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> 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> im Auftrag
von leen peeters via TRNSYS-users <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> 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> im Auftrag
von leen peeters via TRNSYS-users <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> 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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