loadmult has no influence

[solyron]

Hello,

1. I am trying to use the Time series Power Flow, however, no matter what values I give loadmult, the voltage values remains the same. (for example for loadmult=[0,0.5,1] I get 3 identical values of voltages at all of the loads) (the code appears below)
2. Is there an option to get the values of P,Q at each load (like voltages.get_all for voltage values)?
3. Is it possible to identify different loadmult to different loads?

Thank you!

the code:
distSys = SystemClass(path=path, kV=[115, 4.16, 0.48], loadmult=[0,0.5,1])
cfg_tspf(distSys, step_size="1h", initial_time=(0, 0))
[voltageDataFrame] = run_tspf(distSys, tools=[voltages.get_all], num_steps=3)

[felipemarkson]

Hello!

The loadmult is a global OpenDSS variable that multiplies all loads in the system and cannot be assigned as a List. See "LoadMult" on Opendss Manual.

If you need just three simulations, you can use run_static_pf three times with an action that change the loads. See an example of an action that change loads in Creating your first Action.

If you need a time-series power flow, you can use a load shape in the .dss file and assigning this load shape to the loads manually:

! Defining a LoadShape
New Loadshape.my_loadshape npts=3 Interval=1 Pmult=(0.3, 0.5, 1) QMult=(0.1, 0.2, 0.5)

! Setting the LoadShape in loads (You need to include "daily=my_loadshape" in each load definition)
New Load.my_load Bus1=860 Phases=3 Conn=Wye kV=13.8 kW=60.0 kVAR= 48.0 daily=my_loadshape

You can do this in python too:

distSys = SystemClass(path=path, kV=[115, 4.16, 0.48])

p_mult = [0.3, 0.5, 1]
q_mult =  [0.3, 0.5, 1]

cmd = [f"New Loadshape.my_loadshape npts=3 Interval=1 Pmult={p_mult} QMult={q_mult}"]

for load_name in distSys.dss.Loads.AllNames():
    cmd.append(f"Load.{load_name}.daily = my_loadshape")

distSys.dsscontent = distSys.dsscontent + cmd

cfg_tspf(distSys, step_size="1h", initial_time=(0, 0))
[voltageDataFrame] = run_tspf(distSys, tools=[voltages.get_all], num_steps=3)

I need to include a time-series power flow example in the tutorial, but I'm a little busy at the moment☹️.

If this package helps you and you want to contribute, we are open to receiving help, mainly for documentation and tutorials 😀.