Difference between SPCB routine and DIST_BUS_FAULT_2 for unbalanced faults using FACTS devices

Hello all!

I want to run a dynamic simulation using a single-phase to-ground fault. In the.sav I have all the correspondent information, including the negative and zero sequence parameters for the lines, etc...

I see that routine SPCB can determine the resulting pi model after an unbalanced fault for later be used for dynamic simulations. However, it has the part that they transform FACTS devices into constant admittance models. Also, I see that in version 33.5 it is possible to use the function distbusfault_2, which can also simulate unbalanced faults in buses and does not say anything regarding the simplification of FACTS devices models (or at least not explicitly).

So, I wanted to ask you, is there a difference between the two functions? Am I missing something?

It is not clear what you mean. API DISTBUSFAULT_2 was introduced in rev 34.0 and is not available in rev 33.5! This API cannot calculate the equivalent positive shunt admittance.

Since you have sequence data in your saved case you can use the following APIs in the simulation:

Use API dist_scmu_fault to simulate an unbalanced fault at bus. Here you have the option on how DC and FACTS shall be treated (block and ignore, or convert to constant admittance load)

Use API dist_spcb_fault_2 to simulate an unbalanced in-line fault. Also here there is an option for FACTS.

3.8k

perolofl

answered 2022-10-24 09:49:32 -0500

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Hello @perolofl, thanks for the answer. Yes, DIST_BUS_FAULT_2 is included into PSSE v 33.5! In the documentation for v35 it says that it was included since v34, but it is in v33.5. So, do you recommend me to use DIST_BUS_FAULT_2 instead of SCMU or SPCB faults?

tato_343 (2022-10-24 10:27:32 -0500) edit

What kind of fault do you want to simulate? Line-to-ground fault at a bus?

perolofl (2022-10-24 12:38:59 -0500) edit

Yes, indeed.

tato_343 (2022-10-24 13:22:47 -0500) edit

Then use dist_scmu_fault.

perolofl (2022-10-24 14:58:26 -0500) edit

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Difference between SPCB routine and DIST_BUS_FAULT_2 for unbalanced faults using FACTS devices

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Difference between SPCB routine and DIST_BUS_FAULT_2 for unbalanced faults using FACTS devices