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Hi all,

Can someone enlighten me on the subject of the pro's and cons between the two approaches to receive a reduced network model in PSCAD. The two options are below (if you have a better 3rd please feel free to add):

1. By using SCEQ function in PSS/E reducing the network to a reasonable size. Compare V and angles in load flow as well as 3 ph and SLG faults with full and reduced network so they are close. Then use E-tran to convert the reduced network to a PSCAD network for PSCAD simulations (also validation performed against PSS/E data: V, angles, 3 ph, SLG, rotor angle response of generators if any included in .dyr-file)

2. Use E-tran directly to both reduce and convert the network from PSS/E to PSCAD. In an E-tran information sheet they say it can be validated by performing a "network frequency scan" at the relevant bus. First using a reduced network 2 buses away, then 3 then 4 etc. until a nice approximation is received. (Source: descargas.indielec.com/web/Applicationnoteetranconvertingpssetopscad.pdf)

I guess if you have specific ideas on that you want to model 4 buses away on one end and 2 buses away on the other, 2. is not as efficient but also more specifically; Have anyone seen noticable differences in the simulation result between 1 and 2? Anyone with a link to some comparative study etc.?

Best regards MW