MODELS > Models Multi-phase

INPUT, OUTPUT and VAR of a Model can be declared as an array [1..n], and ATPDraw requires the first index to be unity.

Using this can simplify multi-phase handling significantly. The example below shows a 3-phase conversion of data in Cartesian coordinates to Polar. Declaring the INPUT, OUTPUT and VAR as arrays and interacting over them in a for loop simplifies the code considerably.

MODEL CAR2POL

COMMENT

Vonverts the 3-phase input in cartesian notation into polar

ENDCOMMENT

INPUT

Xre[1..3],Xim[1..3] -- The input signal in cartesian coordinates

OUTPUT

Xabs[1..3] -- Magnitude of output

Xang[1..3] -- Angle of output

VAR

i, Xabs[1..3],Xang[1..3]

EXEC

for i:=1 to 3 do

Xabs[i]:=sqrt(Xre[i]**2+Xim[i]**2)

if (Xre[i]=0) and (Xim[i]=0) --seems necessary to protect agains undefined

then

Xang[i]:=0

else

Xang[i]:=atan2(Xim[i],Xre[i])

endif

endfor

ENDEXEC

ENDMODEL

Data can also be declared as arrays, still with unity as the lower index but without restriction on the upper index.