How to implement Battery Model into "for each subsystem" block?

Hallo,

When I try to run a simulink model with a battery model (Li-Ion) (from SimPowerSystems) integrated into a "for each subsystem" block I receive the following error message:

The block 'auto_1/For Each Subsystem/Battery/Model/Continuous/Current filter' with continuous state(s) is not supported inside subsystem 'auto_1/For Each Subsystem' because the subsystem contains a For Each block ('auto_1/For Each Subsystem').

That means the Current filter which is integrated into the battery model causes the problem.

Any suggestions how to solve that issue?

Thanks and regards, Benjamin

Answer 1

[Fangjun Jiang]

The message is clear. A system with continuous state is not supported in the "For Each" block. What is your use case to implement a "For Each" block in a battery model?

Answer 2

[Benjamin]

Thanks for your reply. I want to simulate the charge/discharge behaviour for several time instants and several batteries without modeling each of them. Now I changed the block into a For-Iterator Subsystem. Within this block there is another problem with a GoTo/From Block of the Battery and Equivalent Circuit. The messages are the following: 1: Modell error (Source unknown) - Goto/From connections cannot cross nonvirtual subsystem boundaries. the only exception is when a goto is connected to a state output port 2: Block error (Goto1) - Invalid connection starts with 'auto_1/powergui/EquivalentModel1/Yout/Goto1' 3: Block error (source) - Invalid connection ends with 'auto_1/For Iterator Subsystem/Battery/Current Measurement/source'

Seems as if I neither can implement a battery model into for-iterator. Or is there any possibility to set up a connection between those two ports that cause the problem (2&3)?

Regards

[Fangjun Jiang]

I suspect you are heading to the wrong direction. If you have several batteries, I can't think a way that you can use For-Iterator subsystem instead of duplicating the model. What do you mean "several time instants"?

[Benjamin]

Seems that you're right. Whether I take a for iterator or for each iterator it doesn't make any difference. The battery model is build on continuous sample time. A loop is always based on discrete sample times. So I think I can't solve it this way. The only way to model it is to duplicate the battery block as often as I wanted it to iterate. Not a ideal solution but I think it works out. Any elegant solution how to model a huge amount of batteries with simulink?