maximum_power setter not called

[jaredthomas68]

When I try to run examples/optimization/hybrid_sizing_problem.py as in the draft pull request from jaredthomas68/branch:setter_bug, it appears that the setter for maximum_power in the PowerStorageDispatch class is not being called. I tried making sure the PowerStorageDispatch class was inheriting from object ultimately, but that did not seem to help.

Traceback (most recent call last): File "hybrid_sizing_problem.py", line 72, in <module> hybrid_plant.battery.dispatch.set_fixed_dispatch(fixed_dispatch, grid_limit=np.ones(len(fixed_dispatch))) File "/HOPP/hopp/simulation/technologies/dispatch/power_storage/simple_battery_dispatch_heuristic.py", line 50, in set_fixed_dispatch self._set_power_fraction_limits(gen, grid_limit) File "/HOPP/hopp/simulation/technologies/dispatch/power_storage/simple_battery_dispatch_heuristic.py", line 67, in _set_power_fraction_limits self.max_charge_fraction[t] = self.enforce_power_fraction_simple_bounds(gen[t] / self.maximum_power) File "/HOPP/hopp/simulation/technologies/dispatch/power_storage/power_storage_dispatch.py", line 319, in maximum_power return self.blocks[t].maximum_power.value File "/opt/anaconda3/envs/hopp/lib/python3.8/site-packages/pyomo/core/base/param.py", line 212, in value return self() File "/opt/anaconda3/envs/hopp/lib/python3.8/site-packages/pyomo/core/base/param.py", line 867, in __call__ return super(ScalarParam, self).__call__(exception=exception) File "/opt/anaconda3/envs/hopp/lib/python3.8/site-packages/pyomo/core/base/param.py", line 199, in __call__ raise ValueError( ValueError: Error evaluating Param value (heuristic_battery[0].maximum_power): The Param value is currently set to an invalid value. This is typically from a scalar Param or mutable Indexed Param without