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HVDC transmission link ETAP

HVDC transmission link ETAP

HVDC transmission link ETAP

(OP)
I have been using etap 7.5 demo and have been trying to model an HVDC link connected to 2 buses and conduct a load flow analysis (there is also a generator in swing mode attached to one bus and a normal transmission line connecting the two buses to satisfy the simulation requirements), but it comes up with a pop up error saying calculation error "Calcluation aborted due to HVDC rectifier output or Inverter input kV not matching rated kV".

I am unsure of what settings to use for the ratings page for the HVDC link. The busbars I am connecting to are set to 400 kV.

Does anyone have an example of settings for the HVDC link ratings page that would allow this to operate ?

Thanks

RE: HVDC transmission link ETAP

The best is to ask ETAP sales/tech support.

Meanwhile, make sure that you have checked "nodes" ID, under display options to make them visible. Program may add nodes between devices automatically and it may be referring to those also as buses in question. Make sure all directly interconnected nodes, buses, and devices have the same voltage.

You can also use the "find" function to locate the devices in question and correct them.

Discrepancies like this generally creep in when you 'disconnect" or delete a device to a bus or a node and then reconnect something of a different voltage. Also copying and pasting of similar but different voltage devices creates such situations.

 

Rafiq Bulsara
http://www.srengineersct.com

RE: HVDC transmission link ETAP

Also check for proper voltage inputs units, that is the use of kV vs. V. I believe in ETAP, the inverter/rectifier has AC voltage entry in kV and DC in V.

Rafiq Bulsara
http://www.srengineersct.com

RE: HVDC transmission link ETAP

(OP)
I have tried to contact etap with no response, I have checked for additional nodes but there are none causing a problem and all voltage levels are the same. The DC entry is in kV with a maximum of 9999 kV for DC voltage rating.

The part I do not fully get is the equation given in the help document:

Vdc = kVrectifier * (3*sqrt(2)/pi) * Secondary kV/Primary kV * Bridge Number

This gives the DC Voltage rating, but where does the kVrectifer value come from, I don't know its value is. If this was known I would be able to make this equation work, any ideas?

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