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how to run EnergyPlus FMU through PyFMI

asked 2019-08-14 12:13:26 -0500

mindcoder gravatar image

updated 2019-08-15 16:12:13 -0500

I wrapped one energyplus reference building into FMU and try to simulate the Energyplus-fmu using Pyfmi. My EnergyPlus has 60 seconds as the timestep size.

It looks like it can not go through. Any insightful comments are thankful.

The error i got: File "test_fmi2.py", line 15, in <module> status = model.do_step(current_t = t, step_size= step_size, new_step=True) AttributeError: 'pyfmi.fmi.FMUModelME2' object has no attribute 'do_step

The code snippet i am using is as below:

from pyfmi import load_fmu

model = load_fmu("MyEnergyplus.fmu")
start_time = 0
final_time = 60.0 * 60 * 24 * 3 #seconds
step_size = 60 # seconds

opts = model.simulate_options()
idf_steps_per_hour = 60
ncp = (final_time - start_time)/(3600./idf_steps_per_hour)
opts['ncp'] = ncp

model.initialize( )

t = 0

status = model.do_step(current_t = t, step_size= step_size, new_step=True)
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Comments

How did you wrap the EnergyPlus reference building as an FMU? Which version of PyFMI are you using?

Thierry Nouidui gravatar image Thierry Nouidui  ( 2019-08-15 07:52:12 -0500 )edit

Thanks. I didn't use EnergyPlusToFMU to create those FMU, instead i created FMU from FMI. I am using PyFMI version 2.5.3.

mindcoder gravatar image mindcoder  ( 2019-08-15 16:14:52 -0500 )edit

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answered 2019-08-16 05:53:49 -0500

updated 2019-08-16 08:42:24 -0500

I think that your FMU was wrapped as a Model Exchange FMU (version 2.0) but you are trying to run it as a Co-Simulation FMU. This is I believe the reason why PyFMI is showing the following error pyfmi.fmi.FMUModelME2' object has no attribute do_step. The do_step () method is only available in Co-Simulation FMU. If you really wanted a Model Exchange FMU, then you should use the Model Exchange functions to drive your FMU.

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Asked: 2019-08-14 12:13:26 -0500

Seen: 689 times

Last updated: Aug 16 '19