Question about dummy imports

[Erin6745]

Dear Sir.,

When I check the dummy imports table, I found some dummy imports of DEM. and the commodities are all belong to transportation (see table below). I have already set the driver of the demand of transpotation. I don't know why there are dummy imports of DEM.

Also my results have some dummy imports of NRG, but not in start year. Did there have any mistake in my demand drivers allocation table? Would you tell me some thinking how to correct the mistake?

Really need your help.

Yuan

[AKanudia]

Dummy imports occur for commodities that cannot be produced by the model by any other means. Here is one approach to investigation:

1. Right-click one of the commodities, DTAF for example, in the Commodity list on browse form and select "Commodity Information". There should be some processes, apart from IMP*Z, producing it. If you don't see any, then check the declaration of processes that are meant to produce this commodity.
2. If you do see processes producing it, then double click and check the data tab for clues on why they are not being used in the solution.

Sometimes conflicting user constraints can stop processes from operating.

[Erin6745]

I am sorry. I still can not find the mistake through the commodity information. and I have a new question. DTAF for example, start from the inport of the NGR, the flow is

[IMPKER1]→KER→[TRAEKER]→TRAKER→[TAFEKER]→DTAF    
names with brackets is processes, the others is commodities.

I have set the driver of the DTAF. but there are some dummy inport of DTAF. I do not understand that why the model did not increase the import of KER to meet the DTAF but dummy inport the DTAF. there are no conflicting user constraints about inporting the KER.

[AKanudia]

can you send me this model?

[Erin6745]

I have emailed to you.

[AKanudia]

VEDA FE makes the following assumptions about processes with existing capacity:

1. They are not available for further investment. This is implemented via NCAP_BND(UP)=2 for Year=0.

2. If Existing capacity is specified only in one year, then the capacity will linearly decline to zero over a period = LIFE.

The first default can be overridden by including the table shown below in B-Y Trans file:

After this, there are no more dummies in your model.

Looking at data in VEDA-FE browse would have given you a hint. You should have seen the NCAP_BND attribute that you did not declare. And double-clicking the number 2 would have shown you the message below:

Bottom line: use VEDA browse facility freely... stare at specs of processes that don't work as you expect them to.

[Erin6745]

If some processes have no data. how can I try to find the reason?

last time I inputted the NCAP_BND as you told me. but the electricity power plants which consume the COA and GAS were no any data in the result.

[AKanudia]

post a screen shot of the declaration

[Erin6745]

The declaration of the processes:




and the result missed the processes ELCTECOA00/ELCTEGA00/ELCCEIL00

[AKanudia]

So, a process that you expect to produce ELC doesn't. This means either some other process is producing more than it should, or there is not enough demand for ELC.

Does this help you investigate?

[Erin6745]

Yes, the CHP process(ELCCECOA01) produce more than it should. the other CHP processes are normal. I cannot find the mistake.

there are things make me confused too. process "ELCCECOA01" produce ELC more than it should, but the result showed that it consume none COA. In the exRES I cannot see the VAR_Fin data of the process "ELCCECOA01".

[AKanudia]

very good! "ELCCECOA01" is part of the problem then. Something in the declaration is making it produce without consuming.

post a picture of the declaration of this process...

[Erin6745]

the result showed that all CHP processes consume nothing, but only the ELCCECOA01 produce ELC more...

[AKanudia]

Declaring Comm-IN is not enough... Input and output have to be linked with some Efficiency attribute. Declaring EFF for all processes that don't consume anything should solve your problem.

[Erin6745]

I declared the EFF for all processes. but the hydroelectric process(ELCREHYD00) produce ELC more than it should...


And the power plants (not CHP) consume the COA and GAS produce none ELC...