[TRNSYS-users] need help for simulating stand alone PV

[Diego A. Arias]

Dear ShaoFeng,

Thanks for looking at the example that I sent you.  I should have added 
more information regarding the variables that are  being plotted:
- P_generation: power from the PV module
- P_battery: power from/to the battery. It is negative when it is being 
discharged.
- P_to_load: power directly from the PV or from the battery that go to 
the PV module
- P_dumped: power available from the PV but that is not used.
- P_load: power required.
- P_from_grid: This variable needs additional explanation: Type48 offers 
this output, if you want to simulate a system with battery storage and 
also connected to the grid; it is not a common combination.  So, if you 
want to simulate a stand alone system, just disregard this output.  In 
the example that I sent you, the power produced by the PV module and the 
power from the battery is not enough to meet the load.

I am attaching an image of the P_to_load and the P_battery in which you 
can see that the power from the battery is negative when it is being 
discharged.  If you do not get this plot, please update your copy of TRNSYS.
Best regards,

Diego


Feng Shao wrote:
> Hellow dear Arias
> I appreciate your quick response. I checked your example and since i'm using the
> 16.01.0002 version i changed the TYPE194 with TYPE 94(i'm not clear about the
> difference between TYPE194 and 94, can you briefly explain anything?).
>
> Then i ran your system. In the off-grid plot,i can see that the power from the
> grid is equal to load power and the power from PV is equal to power in/from
> battery. And apparently the SOC of battery goes from 0 to maximum. power
> in/from battery is alway positive. No energy was taken out from the battery,
> that means the role of the battery performed is a load, which is supplied only
> by PV panel. Simple adjustment of TYPE48c's grid relvent parameters or input
> dosen't change anything.
>
> Those are exactly the situation happened in the deck i established myself.
> That's not a real stand alone system. I need to forbid the energy from grid and
> make the battery participate the energy cycle with your help.
>
>
> thank your attention
> good regards
> ShaoFeng
>
> _______________________________________________
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> TRNSYS-users at engr.wisc.edu
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>   


-- 
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706
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