I have a transformer 115/11.5kV controlled secondary voltage between 0.97 and 1.03 Tap setting max 1.1 and min 0.9, tap size = 0.00606.
I am having troubles setting the tap size? Which field is that? and the setting for the current tap? Which field is this?
I would appreciate instructions what is the PSS/E input record for modeling the OLTC. How to obtain the resultant current tap setting after running the loadflow?
In addition to @acd1's answer I want to clarify that the number of steps are:
Nsteps = (Rmax-Rmin))/STEP = (1.1-0.9)/0.00606060606 = 33.
The number of tap changer positions are always Nsteps+1, i.e. NPOS = 33+1 = 34 in this case. Normally, the number of positions are odd numbers so there may be something wrong with the given data here. With 33 tap positions the steps size would be: STEP = 0.2/(33-1) = 0.00625!
The tap size is actually controlled via the "Tap Positions" field. So with a tap range of 0.9 ~ 1.1, you have a range of 0.2. With each tap step of 0.00606, the number of tap positions is 0.2 / 0.00606 which is 33.
The current tap setting will either be "Winding 1 Ratio (pu)" or "Winding 2 Ratio (pu)" depending on your control settings. You can also use the "xfrdat" routine from the psspy API to programatically retrieve the tap ratio for two winding transformers.
Here is a series of batch commands to add a 2-winding zero-impedance transformer between a hypothetical bus 1 and bus 2, as generated by PSSE. The winding 2 ratio is one tap off the nominal ratio, at 1.00606.
BAT_TWO_WINDING_DATA_6,1,2,'1',1,1,1,0,0,0,33,0,1,0,0,1,0,1,1,1,0.0, 0.0001, 100.0, 1.0,0.0,0.0, 1.0,0.0, 1.0, 1.0, 1.0, 1.0,0.0,0.0, 1.1, 0.9, 1.1, 0.9,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0," ",
BAT_TWO_WINDING_CHNG_6,1,2,'1',,,,,,,,,,,,,1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,;
BAT_TWO_WINDING_CHNG_6,1,2,'1',,,,,,,,,,2,,,,,,,,,,,,, 1.00606,,,,,,,,,, 1.03, 0.97,,,,,,,,,,,,,,,,,,;
Asked: 2023-01-24 14:07:04 -0500
Seen: 1,251 times
Last updated: Jan 24 '23
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