def _(e, om, block):
"""Method containing the constraints for commodity
Comoodity are modeled with a fixed output value set for the
variable of the output.
Parameters
----------
See :func:`assembler`.
Returns
-------
See :func:`assembler`.
"""
lc.add_global_output_limit(om, block)
return om
def _(e, om, block):
""" Method creates bus balance for all buses.
The bus model creates all full balance around the energy buses using
the :func:`lc.generic_bus_constraint` function.
Additionally it sets constraints to model limits over the timehorizon
for resource buses using :func:`lc.generic_limit`
Parameters
----------
see :func:`assembler`.
Returns
-------
om : The optimization model passed in as an argument, with additional
bus balances.
"""
# slack variables that assures a feasible problem
# get uids for busses that allow excess
block.excess_uids = [b.uid for b in block.objs if b.excess == True]
# get uids for busses that allow shortage
block.shortage_uids = [b.uid for b in block.objs if b.shortage == True]
# create variables for 'slack' of shortage and excess
if block.excess_uids:
block.excess_slack = po.Var(block.excess_uids,
om.timesteps,
within=po.NonNegativeReals)
if block.shortage_uids:
block.shortage_slack = po.Var(block.shortage_uids,
om.timesteps,
within=po.NonNegativeReals)
print('Creating bus balance constraints ...')
# bus balance constraint for energy bus objects
lc.add_bus_balance(om, block)
# set limits for buses
lc.add_global_output_limit(om, block)
return om
