Problems passing values in GridLAB-D/Fortran co-sim using FAPI

[victorayon]

Hi,

I've been working with the new Fortran API and I have successfully performed two co-simulations. One simulation involves passing values between two simple Fortran models. The second simulation consists of the same two Fortran models plus the C++ simB model from one of the tutorials. In this simulation all three simulators successfully passed and received values between each other.

I am currently woking on a third co-simulation composed of a simple GridLAB-D model and one of the simple Fortran models used in the previous simulations. However, I am having trouble passing values between them. I have been able to pass the value of the inverter variable "VA_Out" to Fortran but only in the first time step. Below is the output from the Fortran model named "fapi_A":

My name is 'fapi_A'
I am federate 0 out of 2 other federates
current time is 1, received 1 events
event value
fncs_inverter/inverter_1@fapi_A/VA_Out +57713.6+0j VA
current time is 2, received 0 events
event value
current time is 3, received 0 events
event value

What you see for times 2 and 3 is repeated for the rest of the simulation.
This is the GLD output:

name = fncs_inverter
time_delta = 1000000000ns
broker = tcp://localhost:5570
values
fapi_A/fncs_inverter/inverter_1@fapi_A/VA_Out
topic = fapi_A/fncs_inverter/inverter_1@fapi_A/VA_Out
default = +0+0j VA
list = false

This is are the lines in my GLD configure file:

route "commit:inverter_1.VA_Out -> fapi_A/VA_Out; 0";
subscribe "precommit:inverter_1.VA_Out <- fapi_A/fncs_inverter/inverter_1@fapi_A/VA_Out";

And the Config portion in the Fortran model:

config = "name = fapi_A"//NEW_LINE('A')//&
"time_delta = 1s"//NEW_LINE('A')//&
"broker = tcp://localhost:5570"//NEW_LINE('A')//&
"values"//NEW_LINE('A')//&
" fncs_inverter/inverter_1@fapi_A/VA_Out"//NEW_LINE('A')//&
" topic = fncs_inverter/inverter_1@fapi_A/VA_Out"//NEW_LINE('A')//&
" list = false"//NEW_LINE('A')

The fncs_msg object in the GLD model reads as follows:

object fncs_msg {
name fncs_inverter;
parent inverter_1;
option "transport:hostname localhost, port 5570";
configure solar1.txt;

The full files are attached. I created the GLD configure file and fncs_msg object using the gld-ns3 tutorial as reference but I still don't understand the format of the "route", "subscribe", and "function" parts.

Could you please point out what I am doing wrong? Also if possible, could you please explain the format of "route", "subscribe", etc.?

Best regards,

Victor Ayon

GLD-Fortran.zip

[jeffdaily]

"route" is intended for use with a communications network simulator. The idea is you pass in the usual key and value, but also two named endpoints representing how the key/value would be transmitted as a network packet between the two endpoints. We use a customized ns-3 when we do this.

Internally, FNCS treats a 'route' message like any other subscription topic but it just has a special form of "simname/from@to/key" --> "value". Normally, a published value just looks like "simname/key" --> "value". The 'route' has the extra middle section with the two endpoints separated by @.

It sounds like you're just trying to exchange values without trying to simulate the value exchange over a communications network -- for example exchanging boundary conditions between transmission and distribution simulators. You should then not use 'route' when setting up your GridLAB-D configuration file.

For the rest of the setup I'll have to defer to @afisher1 to help get your fortran code talking to GridLAB-D. He's our FNCS + GridLAB-D expert.