Problem with Block "Park to Clarke Angle Transform" 2018b

Hello,

I have some problems with the Simscape Block "Park to Clarke Angle Transform".

in the helb ther ist the same Matrix that I normaly use:

[alpha = [ cos(phi) -sin(phi) * [ d

betta ] sin(phi) cos(phi) ] q]

if I look under the Mask in the function blocks there ist:

[alpha = [ cos(offset-phi) +sin(offset-phi) * [ d

betta ] -sin(offset-phi) cos(offset-phi) ] q]

I use the a-axis to d-axis aligen.

So what ist the reasen for this change and why my controller only work with the Matlab Matrix?

Thanks Andy

Answer 1

[Sabin]

In this block 'offset' can be either 0 for D-axis alignment or pi/2 for Q-axis alignment. If a-axis is aligned with d-axis, offset=0 and the two matrices are equal. That is because sin(-phi)=-sin(phi) and cos(-phi)=cos(phi).