Hello
I worked on your case and i haven't understood why your soluttion is exploding but that is the error.
Though If you use WIND GENERATION = 2 it does not explode and give a good result. Normally wind generation =1 should work, but there is a problem in your case that i did not find.
A comment about your time step it is far too big 21600 is too much I used 1600 which is already big. I know it costs more calculation but the result will be better.
Hope it helps.
Thierry